CN103026150B - Air conditioning and hot-water supply system - Google Patents

Abstract

Provide an air-conditioning and hot-water supply system that can operate a hot-water supply cycle using exhaust heat from the air-conditioning cycle even when the air-conditioning load is smaller than the hot-water supply load. The air-conditioning hot water supply system of the present invention has: a refrigerant circuit (5) for air-conditioning that switches between cooling operation and heating operation; a refrigerant circuit (6) for hot water supply that performs hot-water supply operation; An intermediate heat exchanger (23) for exchanging heat between the air-conditioning refrigerant circulating in the circuit and the hot water supply refrigerant circulating in the hot water supply refrigerant circuit; and a control device (1a) for operating control. The control device calculates the amount of heat dissipation required by the air-conditioning refrigerant circuit during cooling operation and the amount of heat absorbed by the refrigerant circuit for hot water supply during hot water supply operation. If the heat dissipation is greater than the heat absorption, the difference is released from the heat source side heat exchanger for air conditioning to the atmosphere, and if the heat absorption is greater than the heat dissipation, the heat source side heat exchanger for hot water supply absorbs the heat from the atmosphere Differential amount of heat.

Description

Air conditioning hot water supply system

technical field

The present invention relates to an air-conditioning hot water supply system, and is particularly suitable for the following air-conditioning and hot water supply system, which switches between the refrigerant circuit for air conditioning for cooling and heating and the refrigerant circuit for hot water supply for hot water supply via intermediate heat The exchangers are connected in a manner capable of exchanging heat with each other to form a binary refrigeration cycle of an air conditioning cycle and a hot water supply cycle.

Background technique

As such an air-conditioning and hot water supply system, there is a system disclosed in Patent Document 1, for example. In this Patent Document 1, a system is disclosed which includes a high-temperature cycle for high-temperature output and a medium-temperature cycle for medium-temperature output or low-temperature output, and is configured such that the evaporator of the high-temperature cycle and the condenser of the medium-temperature cycle can conduct heat exchange. exchange. According to the technique of this patent document 1, since the exhaust heat of the medium-temperature cycle can be effectively used in the high-temperature cycle, economical operation can be performed.

prior art literature

patent documents

Patent Document 1: Japanese Patent Application Laid-Open No. 4-32669

Contents of the invention

The problem to be solved by the invention

However, in the technology described in Patent Document 1, the heat exhausted by the medium-temperature cycle (air-conditioning cycle) can be used as a heat source for the high-temperature cycle (hot water supply cycle) only because the heat dissipation of the medium-temperature cycle is greater than the heat absorbed by the high-temperature cycle. When the amount is large. That is, the operation of the hot water supply cycle using the heat exhausted by the air conditioning cycle can be performed only when the air conditioning load of the air conditioning cycle is high. For example, when air-conditioning a space with high heat insulation performance, a space with little internal heat due to few occupants, etc., or when air-conditioning is performed at night when the outside air temperature drops, it is estimated that the air-conditioning load will decrease , depending on the environmental conditions, there is a possibility that the hot water supply load is greater than the air conditioner load. However, in this case, for the technology described in Patent Document 1, there is a problem that only the heat exhaust from the medium temperature cycle cannot be compared with the high temperature. The cycle requires the ability to operate accordingly.

The present invention was made to solve the above-mentioned problems, and its object is to provide an air-conditioning and hot-water supply system that can utilize exhaust heat from the air-conditioning cycle and Perform an operation corresponding to the required capacity of the hot water supply cycle. Furthermore, another object of the present invention is to provide an air-conditioning and hot water supply system that can be heated by exchanging heat with the atmosphere even when there is a difference between the heat dissipation amount of the air-conditioning cycle and the heat absorption amount of the hot water supply cycle. exchange to improve the overall efficiency of the system, wherein the amount of heat exchanged is the amount of heat corresponding to the difference.

In order to achieve the above object, the present invention is an air-conditioning and hot-water supply system. The air-conditioning and hot-water supply system has a refrigerant circuit for air-conditioning, a refrigerant circuit for hot water supply, an intermediate heat exchanger, and a control device. The exchanger performs heat exchange between the air-conditioning refrigerant circulating in the air-conditioning refrigerant circuit and the hot-water supply refrigerant circulating in the hot-water supply refrigerant circuit, and the control device controls the operation. , the air-conditioning hot water supply system is characterized in that the air-conditioning refrigerant circuit is configured such that the air-conditioning compressor, the air-conditioning flow switching valve, the intermediate heat exchanger, the air-conditioning In the circuit formed by connecting the expansion valve and the air-conditioning use-side heat exchanger to form a loop, between the air-conditioning flow path switching valve and the air-conditioning expansion valve, the air-conditioning heat source side heat exchanger unit and the air-conditioning heat source side heat exchanger unit The intermediate heat exchangers are connected in series or in parallel, and the air-conditioning heat-source-side heat exchanger unit includes: an air-conditioning heat-source-side heat exchanger for exchanging heat between the atmosphere and the air-conditioning refrigerant; The heat source side heat exchanger for the air conditioner blows an outdoor fan for air conditioning; the refrigerant circuit for hot water supply is configured such that the compressor for hot water supply and the utilization side for hot water supply are sequentially connected by refrigerant piping. The hot water supply use-side heat exchanger, the hot water supply expansion valve, and the intermediate heat exchanger are connected to form an annular circuit in which the heat transfer medium performs heat exchange, and the hot water supply compressor The heat source side heat exchanger unit for hot water supply and the intermediate heat exchanger are connected in series or in parallel between the expansion valve for hot water supply, and the heat source side heat exchanger unit for hot water supply includes: a hot water supply heat source side heat exchanger for exchanging heat between the air and the hot water supply refrigerant; and a hot water supply outdoor fan for blowing air to the hot water supply heat source side heat exchanger the control device controls the air-conditioning heat source side heat exchanger unit so that the air conditioner heat source side heat exchanger unit The unit dissipates to the atmosphere a difference in heat equivalent to the difference between the heat dissipation and the heat absorption; in the case of a second load state in which the heat absorption is greater than the heat dissipation, the hot water is controlled A heat source side heat exchanger unit for supplying so that the differential heat is absorbed from the atmosphere by the heat source side heat exchanger unit for hot water supply.

According to the present invention, the refrigerant circuit for air conditioning and the refrigerant circuit for hot water supply are connected so as to be heat exchangeable via the intermediate heat exchanger, and the heat source side heat exchanger for air conditioning is provided in the refrigerant circuit for air conditioning. Since the heat source side heat exchanger for hot water supply is installed in the refrigerant circuit for hot water supply, it is possible to use the exhaust heat from the air conditioning cycle at the two load states of the first load state and the second load state. An operation corresponding to the required capacity of the hot water supply cycle is performed. Furthermore, in the present invention, the control device calculates the amount of heat radiation on the air-conditioning side and the heat absorption on the hot water supply side, and controls the operations of the heat source side heat exchanger unit for air conditioning and the heat source side heat exchanger unit for hot water supply to follow Since the atmosphere performs heat exchange of differential heat corresponding to the difference between the heat radiation amount and the heat absorption amount, the efficiency of the air-conditioning hot water supply system as a whole can be improved.

Here, in the present invention, "controlling the heat source side heat exchanger unit for air conditioning" includes: controlling the rotation speed of the outdoor fan for air conditioning; controlling the first and second refrigerant flow control valves for air conditioning; valve opening; switching the number of passages of the heat source side heat exchanger for air conditioning; combined control of the above methods; and all other controls for adjusting the heat exchange amount of the heat source side heat exchanger for air conditioning. And, similarly, "controlling the heat source side heat exchanger unit for hot water supply" includes: controlling the rotation speed of the outdoor fan for hot water supply; The valve opening of the agent flow control valve; switching the number of passages of the heat source side heat exchanger for hot water supply; controlling the combination of the above methods; and all others used to adjust the heat exchange amount of the heat source side heat exchanger for hot water supply control.

Furthermore, preferably, in the above structure, the air-conditioning hot water supply system is a system in which the air-conditioning heat source side heat exchanger unit is connected in parallel to the intermediate heat exchanger, and the hot water supply The heat source side heat exchanger unit is connected in parallel with the intermediate heat exchanger; the heat source side heat exchanger unit for air conditioning is equipped with a first refrigerant flow control valve for air conditioning and a second refrigerant flow control valve for air conditioning, the first The air-conditioning refrigerant flow control valve and the second air-conditioning refrigerant flow control valve are respectively provided at the inlet and outlet of the air-conditioning heat source side heat exchanger to control the flow rate of the air-conditioning refrigerant. The heat source side heat exchanger unit includes a first refrigerant flow control valve for hot water supply and a second refrigerant flow control valve for hot water supply, the first refrigerant flow control valve for hot water supply and a second hot water supply refrigerant flow control valve. Refrigerant flow control valves are respectively provided at the inlets and outlets of the heat source side heat exchangers for hot water supply to control the flow rate of the refrigerant for hot water supply. The reason is that the control of the whole system is simple.

Furthermore, it is preferable that in the above configuration, the control device controls the rotation speed of the outdoor fan for air conditioning in the case of the first load state, and controls the rotation speed of the outdoor fan for air conditioning in the case of the second load state. Speed of the outdoor fan for water supply. The reason is that the adjustment of the heat exchange amount is simple.

Furthermore, it is preferable that in the above configuration, the control device controls the rotation speed of the outdoor fan for air conditioning and the heat exchange amount of the heat source side heat exchanger unit for air conditioning in the first load state. When the difference with the difference calorific value is also out of a predetermined range, control is performed to adjust at least one of the first air-conditioning refrigerant flow control valve and the second air-conditioning refrigerant flow control valve In order to compensate for the difference; even if the rotation speed of the outdoor fan for hot water supply is controlled under the second load state, the heat exchange amount of the heat source side heat exchanger unit for hot water supply and the When the difference between the difference heat is also outside the predetermined range, control is performed to adjust the flow rate control valve of the first refrigerant flow control valve for hot water supply and the second refrigerant flow control valve for hot water supply. At least one of the valve openings to compensate for this difference.

According to this configuration, in the first load state, even in the case where the air-conditioning refrigerant cannot be distributed to the intermediate heat exchanger and the heat-source-side heat exchanger unit for air-conditioning at an expected flow rate only by controlling the rotational speed of the outdoor fan for air-conditioning In this case, the air-conditioning refrigerant can easily flow into the intermediate heat exchanger by adjusting (restricting) the valve opening of at least one of the first air-conditioning refrigerant flow control valve and the second air-conditioning refrigerant flow control valve. Therefore, it is possible to distribute traffic as expected. Therefore, the air-conditioning exhaust heat can be utilized in the hot water supply cycle without waste. Also, according to this configuration, in the second load state, at least one of the first refrigerant flow control valve for hot water supply and the second refrigerant flow control valve for hot water supply can be adjusted (restricted). The opening degree distributes the refrigerant for hot water supply to the intermediate heat exchanger and the heat source side heat exchanger unit for hot water supply according to the expected flow rate.

Furthermore, it is preferable that in the above configuration, the control device controls the valve opening degree of the expansion valve for hot water supply to meet the requirements of the hot water supply operation in the case of the first load state. After the required predetermined condition, at least one of the rotation speed of the outdoor fan for the air conditioner and the valve opening of the expansion valve for the air conditioner is controlled so as to meet the predetermined condition required for the cooling operation; in the second load state In the case of , after controlling the valve opening of the expansion valve for air conditioning to meet the predetermined conditions required for the cooling operation, the rotation speed of the outdoor fan for hot water supply and the rotation speed of the expansion valve for hot water supply are controlled. at least one of the valve openings so as to satisfy the predetermined conditions required for the hot water supply operation. According to this structure, the heat dissipation of the air-conditioning cycle and the heat absorption of the hot water supply cycle are controlled first, and then the cycle of the larger heat is controlled. Therefore, it is easy to adjust the heat balance. .

Furthermore, in the above configuration, it is preferable that the control device calculates the target condensing temperature of the cooling operation and the hot water supply operation based on the calculated heat dissipation amount, the heat absorption amount, and the outside air temperature. set the target condensing temperature as the predetermined condition required for the cooling operation, and set the target evaporation temperature as the predetermined condition required for the hot water supply operation.

Furthermore, it is preferable that, in the above configuration, the control means controls so as to stop relying on the The heat exchange between the heat source side heat exchanger unit for air conditioning and the heat source side heat exchanger unit for hot water supply with the atmosphere is performed between the refrigerant circuit for air conditioning and the heat exchanger via the intermediate heat exchanger. Operation in which heat is exchanged between refrigerant circuits for water supply. According to this configuration, since the operation can be performed using only the intermediate heat exchanger, it is not necessary to rotate the outdoor fan for air conditioning and the outdoor fan for hot water supply. Accordingly, reduction in power consumption can be expected.

Furthermore, it is preferable that, in the above structure, the heat source side heat exchanger for air conditioning is composed of a plurality of passages through which the refrigerant for air conditioning flows, and the heat source side heat exchanger for hot water supply is composed of passages through which the refrigerant for air conditioning flows. The hot water supply refrigerant flows through a plurality of passages, and the control device performs control to switch the number of passages of the air-conditioning heat source side heat exchanger in the first load state. In the case of a load state, control is performed to switch the number of passages of the heat source side heat exchanger for hot water supply. According to this configuration, not only can the heat transfer area be reduced to efficiently operate the cycle, but also the flow rate of the refrigerant flowing through the heat exchanger can be reduced, thereby preventing refrigerant shortage.

Furthermore, in the above configuration, preferably, the air-conditioning refrigerant circuit includes an air-conditioning refrigerant return pipe and an air-conditioning isolation valve, and the air-conditioning refrigerant return pipe is used to transfer the air-conditioning refrigerant from the The air-conditioning heat source side heat exchanger returns to the suction side of the air-conditioning compressor, the air-conditioning isolation valve is provided in the air-conditioning refrigerant return pipe, and the hot water supply refrigerant circuit has a hot water supply circuit. A refrigerant return pipe for returning the hot water supply refrigerant from the hot water supply heat source side heat exchanger to the hot water supply isolating valve and a hot water supply refrigerant return pipe. On the suction side of the hot water supply compressor, the hot water supply isolation valve is provided in the hot water supply refrigerant return pipe. According to this configuration, since the refrigerant can be returned to the suction side of the compressor, shortage of refrigerant can be prevented.

Furthermore, it is preferable that in the above configuration, the control device includes a forced heating operation mode, and in the forced heating operation mode, heat exchange on the air-conditioning heat source side is performed in the air-conditioning refrigerant circuit. In the heating operation in which the intermediate heat exchanger and the intermediate heat exchanger are used as an evaporator, the hot water supply is performed using the heat source side heat exchanger for hot water supply as an evaporator in the refrigerant circuit for hot water supply. In the forced heating operation mode, the control device controls to open the first air-conditioning refrigerant flow control valve and the second air-conditioning refrigerant flow control valve, so that the air-conditioning refrigerant flows to the Both the heat source side heat exchanger for the air conditioner and the intermediate heat exchanger flow, and the first refrigerant flow control valve for hot water supply and the second refrigerant flow control valve for hot water supply are opened to make the hot water The supply refrigerant flows into the hot water supply heat source side heat exchanger and does not flow into the intermediate heat exchanger.

Furthermore, in the above configuration, it is preferable that the air-conditioning hot water supply system includes a hot water supply flow channel configured to connect the hot water supply to the heat exchanger on the use side by piping. The inlet is connected to the water supply port of the heat transfer medium on the utilization side for hot water supply, and the outlet of the heat exchanger on the utilization side for hot water supply is connected to the outlet of the heat transfer medium on the utilization side for hot water supply by piping. The hot water supply ports are connected to form a flow path for the heat transfer medium on the hot water supply use side to flow, and the hot water supply use side heat exchanger and the hot water supply port in the flow path A hot water storage container is provided at a position between them, and the hot water storage container is used to store the heat transfer medium on the utilization side of the hot water supply, and the control device is equipped with an instantaneous boiling operation mode. Next, in the air-conditioning refrigerant circuit, a cooling operation using the intermediate heat exchanger as a condenser is performed, and in the hot water supply refrigerant circuit, the hot water supply heat source side The heat exchanger and the intermediate heat exchanger operate as hot water supply for the evaporator, and in the instant boiling operation mode, the control device closes the first air-conditioning refrigerant flow control valve and the second air-conditioning refrigerant flow control valve. Two air-conditioning refrigerant flow control valves, and control the rotation speed of the hot water supply compressor to a predetermined rotation speed, and control the hot water supply outdoor fan so as to absorb from the atmosphere and the air-conditioning refrigerant circuit The differential heat amount corresponds to the difference between the heat dissipation amount and the heat absorption amount of the refrigerant circuit for hot water supply.

Furthermore, in the above configuration, it is preferable that the control device includes a rapid cooling operation mode, and in the rapid cooling operation mode, heat exchange on the heat source side for the air conditioner is performed in the refrigerant circuit for air conditioning. Cooling operation in which the intermediate heat exchanger and the intermediate heat exchanger are used as a condenser, and hot water supply operation in which the intermediate heat exchanger is used as an evaporator is performed in the refrigerant circuit for hot water supply. In the cooling operation mode, the control device closes the first refrigerant flow control valve for hot water supply and the second refrigerant flow control valve for hot water supply, and controls the rotation speed of the air-conditioning compressor to The air-conditioning outdoor fan is controlled to rotate at a predetermined speed so that the difference between the heat dissipation amount of the air-conditioning refrigerant circuit and the heat absorption amount of the hot water supply refrigerant circuit is released to the atmosphere.

The effect of the invention

According to the present invention, not only when the air conditioning load is larger than the hot water supply load, but also when the air conditioning load is smaller than the hot water supply load, it is possible to perform heating and heating while utilizing exhaust heat from the air conditioning cycle. The supply cycle requires capacity to function accordingly. In addition, according to the present invention, even if there is a difference between the heat dissipation amount of the air-conditioning cycle and the heat absorption amount of the hot water supply cycle, heat exchange with the atmosphere corresponding to the amount of heat can be performed, thereby improving the overall efficiency of the system. Furthermore, since the present invention has various operation modes, it can not only achieve a balance between the heat dissipation of the air-conditioning cycle and the heat absorption of the hot water supply cycle, but also respond to various operation requirements.

Description of drawings

FIG. 1 is a system diagram of an air-conditioning and hot water supply system according to a first embodiment of the present invention.

Fig. 2 is a diagram showing an operation mode of the air-conditioning and hot water supply system shown in Fig. 1 .

Fig. 3 is a diagram showing an operation mode of the air-conditioning and hot water supply system shown in Fig. 1 .

Fig. 4 is an operation diagram showing flows of refrigerant and a heat transfer medium in the cooling/hot water supply individual operation mode shown in Fig. 2 .

Fig. 5 is an operation diagram showing flows of refrigerant and a heat transfer medium in the heating/hot water supply individual operation mode shown in Fig. 2 .

FIG. 6 is a flowchart showing the procedure of control processing in the scheduled operation mode shown in FIG. 2 .

Fig. 7 is a flowchart showing the procedure of control processing in the scheduled operation mode shown in Fig. 2 .

FIG. 8 is a flowchart showing the procedure of control processing in the scheduled operation mode shown in FIG. 2 .

Fig. 9 is an operation diagram showing flows of refrigerant and a heat transfer medium in a control 1 mode of the scheduled operation mode shown in Fig. 2 .

Fig. 10 is an operation diagram showing flows of refrigerant and a heat transfer medium in a control 2 mode of the scheduled operation mode shown in Fig. 2 .

Fig. 11 is an operation diagram showing flows of refrigerant and a heat transfer medium in a control 3 mode of the scheduled operation mode shown in Fig. 2 .

Fig. 12 is an operation diagram showing flows of refrigerant and a heat transfer medium in the forced heating operation mode shown in Fig. 3 .

Fig. 13 is a flowchart showing the procedure of control processing in the instant boiling operation mode shown in Fig. 3 .

Fig. 14 is a flowchart showing the procedure of control processing in the instant boiling operation mode shown in Fig. 3 .

FIG. 15 is a flowchart showing the procedure of control processing in the rapid cooling operation mode shown in FIG. 3 .

Fig. 16 is a flowchart showing the procedure of control processing in the non-exhaust heated air operation mode shown in Fig. 3 .

Fig. 17 is a flowchart showing the procedure of control processing in the non-exhaust heated air operation mode shown in Fig. 3 .

FIG. 18 is a flowchart showing the procedure of control processing in the energy-saving operation mode shown in FIG. 3 .

FIG. 19 is a flowchart showing the procedure of control processing in the energy-saving operation mode shown in FIG. 3 .

Fig. 20 is a system diagram of an air-conditioning and hot water supply system according to a second embodiment of the present invention.

Fig. 21 is a system diagram of an air-conditioning and hot water supply system according to a third embodiment of the present invention.

Detailed ways

The air-conditioning hot water supply system according to the first embodiment of the present invention is a system that includes, as shown in FIG. operation; the refrigerant circuit 6 for hot water supply, which drives the compressor 41 for hot water supply to perform hot water supply operation; indoor air conditioning; the hot water supply flow path 9, which exchanges heat with the hot water supply refrigerant circuit 6 to supply hot water; and the control device 1a, which performs operation control; the air conditioner refrigerant circuit 5 and the The hot water supply refrigerant circuit 6 is thermally connected via the intermediate heat exchanger 23 to form a dual refrigeration cycle of an air conditioning cycle and a hot water supply cycle.

This air-conditioning and hot water supply system has a unit structure including a heat pump unit 1 disposed outdoors and an indoor unit 2 disposed indoors, and the heat pump unit 1 is assembled with a refrigerant circuit 5 for air conditioning and a refrigerant circuit 6 for hot water supply. , the cold and hot water circulation circuit 8 for air conditioning, the hot water supply flow path 9, and the control device 1a. Furthermore, an indoor heat exchanger 61 for exchanging heat with indoor air of the house 60 is incorporated in the indoor unit 2 .

The air-conditioning refrigerant circuit 5 is a circuit that forms a refrigeration cycle (air-conditioning cycle) by circulating the air-conditioning refrigerant, and is configured to exchange heat with the air sent from the air-conditioning outdoor fan 25. The air-conditioning heat source side heat exchanger 24 is connected to the air-conditioning refrigerant main circuit 5a that uses refrigerant piping to switch the air-conditioning compressor 21 for compressing the air-conditioning refrigerant, Four-way valve (air-conditioning flow switching valve) 22 for the flow path of the air-conditioning refrigerant, and an intermediate heat exchanger for exchanging heat with the hot-water supply refrigerant circulating in the hot-water supply refrigerant circuit 6 23. The air-conditioning refrigerant container 26, the air-conditioning expansion valve 27 for decompressing the air-conditioning refrigerant, and the air-conditioning use-side heat exchanger 28 for heat exchange with the air-conditioning cold and hot water circulation circuit 8 are connected and formed into a ring. Here, although heat exchange is performed with the cold/hot water circulation circuit 8 for air conditioning, heat exchange with indoor air of the house 60 may be performed directly without passing through the cold/hot water circulation circuit 8 for air conditioning.

In more detail, the air-conditioning heat source side heat exchanger 24 is connected in parallel with the intermediate heat exchanger 23 between the four-way valve 22 of the air-conditioning refrigerant main circuit 5a and the air-conditioning expansion valve 27. position, the first expansion valve (first air-conditioning refrigerant flow control valve) 35c and the second expansion valve (second air-conditioning refrigerant flow control valve) 35c and the second expansion valve (second air-conditioning Refrigerant flow control valve) 35d. Here, the heat source side heat exchanger 24 for air conditioning, the outdoor fan 25 for air conditioning, the first expansion valve 35c, and the second expansion valve 35d correspond to the heat source side heat exchanger unit for air conditioning of the present invention. In addition, as the air-conditioning refrigerant circulating in the air-conditioning refrigerant circuit 5, refrigerants suitable for use conditions among R410a, R134a, HFO1234yf, HFO1234ze, and CO2 are used.

Next, the configuration of each device incorporated in the above-mentioned air-conditioning refrigerant circuit 5 will be described in detail. The air-conditioning compressor 21 is a capacity-variable compressor capable of capacity control. As such compressors, compressors of a piston type, a rotary type, a scroll type, a screw type, and a centrifugal type can be used. Specifically, the air-conditioning compressor 21 is a scroll compressor whose capacity can be controlled by inverter control, and whose rotation speed can be changed from low speed to high speed.

Although not shown in the figure, the air-conditioning use-side heat exchanger 28 is configured as an air-conditioning refrigerant heat transfer pipe through which the air-conditioning refrigerant flows and an air-conditioning cold and hot water heat transfer pipe through which water (the heat transfer medium on the air-conditioning use side) flows. thermal contact. The air-conditioning refrigerant container 26 has a function as a buffer for controlling the amount of the air-conditioning refrigerant that changes due to flow path switching of the air-conditioning refrigerant circuit 5 . The air-conditioning expansion valve 27 reduces the pressure of the air-conditioning refrigerant to a predetermined pressure by adjusting the opening degree of the valve.

The cold and hot water circulation circuit 8 for air conditioning is a circuit in which water flows as a heat transfer medium on the utilization side of the air conditioner for heat exchange with the refrigerant circuit 5 for air conditioning. The water pipe 55a connects the four-way valve 53, the air-conditioning cold and hot water circulation pump 52, and the indoor heat exchanger 61 installed in the house 60, and the air-conditioning cold and hot water pipe 55b connects the indoor heat exchanger 61 and the four-way valve 22. Then, the four-way valve 53 and the air-conditioning use-side heat exchanger 28 are connected together by the hot and cold water piping 55c for the air-conditioning, thereby forming an annular circuit. The water (cold water or hot water) flowing in the cold and hot water circulation circuit 8 for air conditioning exchanges heat with the air in the house 60 via the indoor heat exchanger 61 to cool or heat the house 60 . Here, instead of water, a brine such as ethylene glycol may be used as the heat transfer medium on the air-conditioning utilization side flowing in the cold-hot water circulation circuit 8 for air-conditioning. Of course, if a brine is used, it can also be used in cold regions.

In addition, in the following description, words such as "cold water" or "hot water" are used as the water flowing in the cold and hot water circulation circuit 8 for air conditioning. "Hot water" means the water flowing through the cold and hot water circulation circuit 8 for air-conditioning at the time of heating.

The refrigerant circuit 6 for hot water supply is a circuit that forms a refrigeration cycle (hot water supply cycle) by circulating a refrigerant for hot water supply, and the refrigerant circuit 6 for hot water supply is configured to communicate with The heat source side heat exchanger 44 for hot water supply that exchanges heat with the atmosphere sent by the fan 45 is connected to the main refrigerant circuit 6a for hot water supply, and the refrigerant piping for the main refrigerant circuit 6a for hot water supply will be used for The hot water supply compressor 41 that compresses the hot water supply refrigerant, the hot water supply use-side heat exchanger 42 that performs heat exchange with the hot water supply flow path 9, and a device for controlling the amount of the hot water supply refrigerant are provided. The refrigerant container 46 for hot water supply that functions as a buffer, the expansion valve 43 for hot water supply that depressurizes the refrigerant for hot water supply, and the refrigerant for air conditioning that circulates in the refrigerant circuit 5 for air conditioning The intermediate heat exchangers 23 that perform heat exchange are connected and formed in a ring shape.

To describe in more detail, the hot water supply heat source side heat exchanger 44 is connected to the hot water supply compressor 41 and the heat exchanger in the hot water supply refrigerant main circuit 6 a in parallel with the intermediate heat exchanger 23 . Between the water supply expansion valves 43, a third expansion valve (the first hot water supply refrigerant flow rate) is assembled at the inlet and outlet of the hot water supply heat source side heat exchanger 44 to respectively control the flow rate of the hot water supply refrigerant. flow control valve) 49a and the fourth expansion valve (second refrigerant flow control valve for hot water supply) 49c. Here, the hot water supply heat source side heat exchanger 44, the hot water supply outdoor fan 45, the third expansion valve 49a, and the fourth expansion valve 49c correspond to the hot water supply heat source side heat exchanger unit of the present invention. In addition, as the refrigerant for hot water supply circulating in the refrigerant circuit 6 for hot water supply, a refrigerant suitable for use conditions among R410a, R134a, HFO1234yf, HFO1234ze, and CO2 is used.

Next, the configuration of each device incorporated in the above-mentioned refrigerant circuit 6 for hot water supply will be described in detail. The capacity of the hot water supply compressor 41 can be controlled by inverter control similarly to the air-conditioning compressor 21 , and the rotation speed can be varied from a low speed to a high speed. Although not shown in the figure, the hot water supply use-side heat exchanger 42 is configured such that the hot water supply water heat pipe and the hot water supply refrigerant heat pipe are in thermal contact, and the hot water supply water heat pipe is supplied to the hot water supply flow path. 9. The supplied water flows, and the hot water supply refrigerant heat transfer pipes allow the hot water supply refrigerant to flow. The expansion valve 43 for hot water supply can reduce the pressure of the refrigerant for hot water supply to a predetermined pressure by adjusting the opening degree of the valve.

Here, in this embodiment, a plate heat exchanger is used as the intermediate heat exchanger 23 . Furthermore, two-way valves 35a and 35b are respectively provided at the inlet and outlet of the intermediate heat exchanger 23 of the air-conditioning refrigerant circuit 5, and two-way valves are respectively provided at the inlet and outlet of the intermediate heat exchanger 23 of the hot water supply refrigerant circuit 6. 49b, 49d.

The hot water supply flow path 9 is a flow path through which water as a heat transfer medium on the hot water supply and utilization side flows, and connects the hot water supply piping 72 between the inlet of the hot water supply utilization side heat exchanger 42 and the water supply port 78 . It is a flow path formed by connecting the hot water supply piping 73 to the outlet of the hot water supply utilization side heat exchanger 42 and the hot water supply port 79 . A hot water storage container 70 is attached to the hot water supply piping 73, and the water supplied from the water supply port 78 is stored in the hot water storage container after being heat-exchanged in the hot water supply use-side heat exchanger 42 to become hot water. 70. Next, the hot water stored in the hot water storage tank 70 is supplied from the hot water supply port 79 to the hot water supply load side (bath, toilet, kitchen, etc.). Furthermore, a drain pipe 71a and a drain valve 71b are provided at the bottom of the hot water storage container 70 . The drain valve 71b is normally closed, but upon receiving a command from the control device 1a, the drain valve 71b is opened, and the hot water stored in the hot water storage tank 70 is discharged to the outside through the drain pipe 71a. In addition, although not shown, a flow sensor for detecting the flow rate of water is incorporated in the hot water supply channel 9 .

This air-conditioning and hot water supply system includes a plurality of temperature sensors TH1 to TH20. Specifically, in order to measure the temperature of water flowing through the hot water supply channel 9 , a temperature sensor TH2 is provided at the inlet of the hot water supply use side heat exchanger 42 , and a temperature sensor TH1 is provided at the water supply port 78 . Moreover, in order to measure the temperature of the hot and cold water flowing in the cold and hot water circulation circuit 8 for air conditioning, a temperature sensor TH4 is installed at the inlet of the heat exchanger 28 on the air-conditioning use side during heating operation, A temperature sensor TH3 is installed at the outlet of the heat exchanger 28 during heating operation, and a temperature sensor TH5 is installed at the outlet of the indoor heat exchanger 61 .

Furthermore, in order to measure the temperature of the hot water supply refrigerant flowing in the hot water supply refrigerant circuit 6, a temperature sensor TH6 is provided at the suction port 41a of the hot water supply compressor 41, and a temperature sensor TH6 is installed in the hot water supply compressor 41a. The discharge port 41b of 41 is provided with a temperature sensor TH7, a temperature sensor TH8 is provided at the outlet of the expansion valve 43 for hot water supply, a temperature sensor TH9 is provided at the outlet of the heat source side heat exchanger 44 for hot water supply, and a temperature sensor TH9 is provided at the outlet of the intermediate heat exchanger 23. The outlet is equipped with a temperature sensor TH10.

Moreover, in order to measure the temperature of the air-conditioning refrigerant flowing in the air-conditioning refrigerant circuit 5, a temperature sensor TH11 is provided at the suction port 21a of the air-conditioning compressor 21, and a temperature sensor is provided at the discharge port 21b of the air-conditioning compressor 21. TH12, a temperature sensor TH13 and a temperature sensor TH14 are installed at the inlet and outlet of the intermediate heat exchanger 23, and a temperature sensor TH15 and a temperature sensor TH16 are installed at the inlet and outlet of the heat source side heat exchanger 24 for air conditioning. A temperature sensor TH17 is provided at the outlet, and a temperature sensor TH18 is provided at the outlet of the air-conditioning use-side heat exchanger 28 during cooling operation.

Moreover, the air-conditioning hot water supply system is also provided with a temperature sensor TH19 for measuring the temperature of the outside air, a temperature sensor TH20 for measuring the indoor temperature of the house 60, and a temperature sensor for measuring the temperature of the hot water stored in the hot water storage container 70. The temperature sensor TH21.

Furthermore, the air-conditioning compressor 21 is provided with a rotational speed detection sensor RA for detecting the rotational speed. The rotation speed detection sensor RH is similarly provided on the hot water supply compressor 41 . Furthermore, the air-conditioning expansion valve 27 is provided with a valve opening detection sensor PA for detecting the valve opening, and the hot water supply expansion valve 43 is provided with a valve opening detection sensor PH for detecting the valve opening.

The control device 1a inputs command signals from a remote controller not shown, detection signals from temperature sensors TH1 to TH21, rotation speed detection sensors RA, RH, valve opening detection sensors PA, PH, etc., and performs air conditioning based on these input signals. Drive and stop of compressor 21 and hot water supply compressor 41, switching of four-way valves 22 and 53, adjustment of valve openings of air conditioning expansion valve 27 and hot water supply expansion valve 43, expansion valve 35c, Adjustment of valve opening of 35d, 49a, 49c, driving and stopping of cold and hot water circulation pump 52 for air conditioning, opening and closing of two-way valves 35a, 35b, 49a, 49d, 54a, 54b, and other hot water supply systems for air conditioning the controls required for its operation.

Next, various operation modes performed by the air-conditioning and hot water supply system according to the first embodiment will be described. First, the outline of each operation mode will be described with reference to FIGS. 2 and 3 . The air-conditioning and hot water supply system according to the first embodiment includes "cooling/hot water supply individual operation mode", "heating/hot water supply individual operation mode", "scheduling operation mode", "forced heating operation mode", "instantaneous Boiling operation mode", "rapid cooling operation mode", "non-exhaust hot air operation mode" and "energy-saving operation mode" are eight operation modes.

The "cooling/hot water supply individual operation mode" is an operation mode in which the cooling operation of the air-conditioning refrigerant circuit 5 and the hot water supply operation of the hot water supply refrigerant circuit 6 are independently performed. As shown in FIG. 2 , in this operation mode, in the hot water supply cycle, the hot water supply compressor 41 operates, the hot water supply use side heat exchanger 42 is used as a condenser, and the hot water supply heat source side heat exchanger 42 is used as a condenser. The heat exchanger 44 is used as an evaporator, and the intermediate heat exchanger 23 is not used. On the other hand, in the air-conditioning cycle, the air-conditioning compressor 21 operates, the air-conditioning use-side heat exchanger 28 is used as an evaporator, and the air-conditioning heat source-side heat exchanger 24 is used as a condenser, and no intermediate heat exchanger is used. twenty three.

The "heating/hot water supply individual operation mode" is an operation mode in which the heating operation of the air-conditioning refrigerant circuit 5 and the hot water supply operation of the hot water supply refrigerant circuit 6 are independently performed. As shown in FIG. 2 , in this operation mode, in the hot water supply cycle, the hot water supply compressor 41 operates, the hot water supply use side heat exchanger 42 is used as a condenser, and the hot water supply heat source side heat exchanger 42 is used as a condenser. The heat exchanger 44 is used as an evaporator, and the intermediate heat exchanger 23 is not used. On the other hand, in the air-conditioning cycle, the air-conditioning compressor 21 operates, the air-conditioning use-side heat exchanger 28 is used as a condenser, and the air-conditioning heat source-side heat exchanger 24 is used as an evaporator, and no intermediate heat exchanger is used. twenty three.

In the "scheduling operation mode", heat is exchanged between the air-conditioning refrigerant flowing in the air-conditioning refrigerant circuit 5 and the hot water supply refrigerant flowing in the hot water supply refrigerant circuit 6 via the intermediate heat exchanger 23, An operation mode in which the cooling operation of the air-conditioning refrigerant circuit 5 and the hot water supply operation of the hot water supply refrigerant circuit 6 are performed. In this scheduling operation mode, the three types of control 1 to control 3 are set according to the amount of hot water supply heat absorption required by the hot water supply refrigerant circuit 6 and the air-conditioning heat dissipation required by the air-conditioning refrigerant circuit 5 . operating mode.

When the difference between the heat absorbed by the hot water supply and the heat released by the air conditioner is within a predetermined range, it can be regarded as the heat absorbed by the hot water supply is equal to the heat released by the air conditioner, that is, when the load of the air conditioner and hot water supply system is the first The operation mode performed in the case of the three-load state is "control 1 mode". As shown in Fig. 2, in the control 1 mode, in the hot water supply cycle, the hot water supply compressor 41 operates, the hot water supply use side heat exchanger 42 is used as a condenser, and the hot water supply heat source is not used. The side heat exchanger 44 uses the intermediate heat exchanger 23 as an evaporator. On the other hand, in the air-conditioning cycle, the air-conditioning compressor 21 operates, the air-conditioning use-side heat exchanger 28 is used as an evaporator, the air-conditioning heat source-side heat exchanger 24 is not used, and the intermediate heat exchanger 23 is used as a condenser. use. That is, in the control 1 mode, since the heat absorbed by the hot water supply and the heat released by the air conditioner are balanced, only the heat source side heat exchanger 44 for hot water supply and the heat source side heat exchanger 24 for air conditioner are used. Operation using the intermediate heat exchanger 23 .

The operation mode performed when the air-conditioning heat dissipation is greater than the hot-water supply heat absorption, that is, when the load of the air-conditioning and hot-water supply system is in the first load state, is the "control 2 mode". As shown in Fig. 2, in the control 2 mode, in the hot water supply cycle, the hot water supply compressor 41 operates, the hot water supply use side heat exchanger 42 is used as a condenser, and the hot water supply heat source is not used. The side heat exchanger 44 uses the intermediate heat exchanger 23 as an evaporator. On the other hand, in the air-conditioning cycle, the air-conditioning compressor 21 operates, the air-conditioning use-side heat exchanger 28 is used as an evaporator, the air-conditioning heat source-side heat exchanger 24 is used as a condenser, and the intermediate heat exchanger 23 is used as an evaporator. Used as a condenser. That is, in the control 2 mode, since the air-conditioning heat dissipation is larger than the hot-water supply heat absorption, only the exhaust heat of the air-conditioning cycle is discharged to the hot water supply cycle through the intermediate heat exchanger 23, and the heat cannot be balanced. , from the air-conditioning heat source side heat exchanger 24 to the atmosphere to perform cooling operation and hot water supply operation, the amount of heat radiation is equivalent to the difference between the air-conditioning heat dissipation and hot water supply heat absorption (residual amount ).

When the amount of heat absorbed by hot water supply is greater than the amount of heat released by the air conditioner, that is, when the load of the air conditioner and hot water supply system is in the second load state, the operation mode is "control 3 mode". As shown in Figure 2, the control 3 mode is that in the hot water supply cycle, the compressor 41 for hot water supply operates, the heat exchanger 42 on the user side for hot water supply is used as a condenser, and the heat source side heat exchanger 42 for hot water supply is used as a condenser. The heat exchanger 44 is used as an evaporator, and the intermediate heat exchanger 23 is used as an evaporator. On the other hand, in the air-conditioning cycle, the air-conditioning compressor 21 operates, the air-conditioning use-side heat exchanger 28 is used as an evaporator, the air-conditioning heat source-side heat exchanger 24 is not used, and the intermediate heat exchanger 23 is used as a condenser. use. That is, in the control 3 mode, since the heat absorbed by the hot water supply is larger than the heat released by the air conditioner, only the exhaust heat of the air conditioning cycle is dissipated to the hot water supply cycle through the intermediate heat exchanger 23, and the heat cannot be balanced. Heat is absorbed from the atmosphere via the heat source side heat exchanger 44 for hot water supply, and the amount of absorbed heat is the difference in heat equivalent to the difference between the heat dissipation amount of the air conditioner and the heat absorption amount of hot water supply to perform cooling operation and hot water supply operation. (Insufficient amount).

The "forced heating operation mode" is an operation mode for performing a heating operation of the air-conditioning refrigerant circuit 5 using the intermediate heat exchanger 23 and a hot water supply operation of the hot water supply refrigerant circuit 6 . As shown in FIG. 3 , in this operation mode, in the hot water supply cycle, the hot water supply compressor 41 operates, the hot water supply use side heat exchanger 42 is used as a condenser, and the hot water supply heat source side heat exchanger 42 is used as a condenser. The heat exchanger 44 is used as an evaporator, and the intermediate heat exchanger 23 is not used. On the other hand, in the air-conditioning cycle, the air-conditioning compressor 21 operates, the air-conditioning use-side heat exchanger 28 is used as a condenser, the air-conditioning heat source-side heat exchanger 24 is used as an evaporator, and the intermediate heat exchanger 23 is used as a condenser. Used as an auxiliary evaporator. This forced heating operation mode is a mode in which not only the air-conditioning heat source side heat exchanger 24 is used as an evaporator, but also the intermediate heat exchanger 23 is used as an evaporator to some extent by utilizing the heat transfer surface of the plate of the intermediate heat exchanger 23, Thereby, the evaporation temperature of the air conditioning cycle can be increased, so it is especially suitable for the situation that the indoor is not sufficiently heated in winter.

In the "instant boiling operation mode", heat is exchanged between the air-conditioning refrigerant flowing in the air-conditioning refrigerant circuit 5 and the hot water supply refrigerant flowing in the hot water supply refrigerant circuit 6 via the intermediate heat exchanger 23 . , the operation mode in which the cooling operation of the refrigerant circuit 5 for air conditioning and the hot water supply operation of the refrigerant circuit 6 for hot water supply are performed. As shown in FIG. 3 , in this operation mode, in the hot water supply cycle, the hot water supply compressor 41 operates, the hot water supply use side heat exchanger 42 is used as a condenser, and the hot water supply heat source side heat exchanger 42 is used as a condenser. The heat exchanger 44 is used as an evaporator, and the intermediate heat exchanger 23 is used as an evaporator. On the other hand, in the air-conditioning cycle, the air-conditioning compressor 21 operates, the air-conditioning use-side heat exchanger 28 is used as an evaporator, the air-conditioning heat source-side heat exchanger 24 is not used, and the intermediate heat exchanger 23 is used as a condenser. use. This instant boiling operation mode is an operation mode suitable for a case where the hot water supply load temporarily increases, such as when a large amount of hot water is temporarily required.

In the "quick cooling operation mode", heat is exchanged between the air-conditioning refrigerant flowing in the air-conditioning refrigerant circuit 5 and the hot water supply refrigerant flowing in the hot water supply refrigerant circuit 6 via the intermediate heat exchanger 23 . , the operation mode in which the cooling operation of the refrigerant circuit 5 for air conditioning and the hot water supply operation of the refrigerant circuit 6 for hot water supply are performed. As shown in FIG. 3 , in this operation mode, in the hot water supply cycle, the hot water supply compressor 41 operates, the hot water supply use side heat exchanger 42 is used as a condenser, and the hot water supply heat source is not used. The side heat exchanger 44 uses the intermediate heat exchanger 23 as an evaporator. On the other hand, in the air-conditioning cycle, the air-conditioning compressor 21 is operated at a predetermined operating speed (Max speed), the air-conditioning use-side heat exchanger 28 is used as an evaporator, and the air-conditioning heat source-side heat exchanger 24 is used as a condenser. The device is used, and the intermediate heat exchanger 23 is used as a condenser. This rapid cooling operation mode is an operation mode suitable for cooling the room instantaneously in summer.

In the "no exhaust hot air operation mode", the air-conditioning refrigerant flowing in the air-conditioning refrigerant circuit 5 and the hot water supply refrigerant flowing in the hot water supply refrigerant circuit 6 are heated through the intermediate heat exchanger 23 . An operation mode in which the cooling operation of the air-conditioning refrigerant circuit 5 and the hot water supply operation of the hot water supply refrigerant circuit 6 are performed while switching. As shown in FIG. 3 , in this operation mode, in the hot water supply cycle, the hot water supply compressor 41 operates, the hot water supply use side heat exchanger 42 is used as a condenser, and the hot water supply heat source is not used. The side heat exchanger 44 uses the intermediate heat exchanger 23 as an evaporator. On the other hand, in the air-conditioning cycle, the air-conditioning compressor 21 is operated (and then stopped), and the use-side heat exchanger 28 for air-conditioning is used as an evaporator. The heat-source-side heat exchanger 24 for air-conditioning is not used, and the intermediate heat exchanger 23 is used as a condenser. This non-exhaust hot air operation mode is an operation mode suitable for operation in a situation where it is not desired to discharge hot air from the air-conditioning heat source side heat exchanger 24 .

In the "energy-saving operation mode", heat is exchanged between the air-conditioning refrigerant flowing in the air-conditioning refrigerant circuit 5 and the hot water supply refrigerant flowing in the hot water supply refrigerant circuit 6 via the intermediate heat exchanger 23 , An operation mode in which the cooling operation of the air-conditioning refrigerant circuit 5 and the hot water supply operation of the hot water supply refrigerant circuit 6 are performed. As shown in FIG. 3 , in this operation mode, in the hot water supply cycle, the hot water supply compressor 41 operates, the hot water supply use side heat exchanger 42 is used as a condenser, and the hot water supply heat source is not used. The side heat exchanger 44 uses the intermediate heat exchanger 23 as an evaporator. On the other hand, in the air-conditioning cycle, the air-conditioning compressor 21 is operated (and then stopped), and the use-side heat exchanger 28 for air-conditioning is used as an evaporator. The heat-source-side heat exchanger 24 for air-conditioning is not used, and the intermediate heat exchanger 23 is used as a condenser. This energy-saving operation mode is an operation mode suitable for performing hot water supply/cooling operation while reducing electricity costs as much as possible.

Next, details of each of the aforementioned operation modes will be described with reference to FIGS. 4 to 19 . In addition, in Fig. 4, Fig. 5, Fig. 9 ~ Fig. 12, the white thick arrow marked on the heat exchanger indicates the flow of heat, and the arrow marked on each circuit 5, 6, 8, 9 indicates that the refrigerant or fluid flows The direction of flow in each circuit. Also, a white two-way valve indicates an open state, and a black two-way valve indicates a closed state. Furthermore, the expansion valves 35c, 35d, 49a, and 49c show an open state when they are white, and show a closed state when they are black. Furthermore, the arc-shaped solid lines drawn on the four-way valves 22 and 53 indicate the flow paths of the fluid flowing through the four-way valves. Furthermore, the outdoor fan 25 for air conditioning and the outdoor fan 45 for hot water supply show that they are in operation when they are white, and that they are stopped when they are black. Also, the heat exchanger shown with a dotted line indicates that it is not used in this operation mode, that is, it indicates that no refrigerant flows through it.

First, the flows of the refrigerant and the heat transfer medium in the "cooling/hot water supply individual operation mode" will be described in detail with reference to FIG. 4 .

In the air-conditioning refrigerant circuit 5 , the high-temperature and high-pressure gas refrigerant discharged from the discharge port 21 b of the air-conditioning compressor 21 flows into the air-conditioning heat source side heat exchanger 24 through the four-way valve 22 . The high-temperature and high-pressure gas refrigerant flowing into the air-conditioning heat source side heat exchanger 24 dissipates heat to the atmosphere sent from the air-conditioning outdoor fan 25 to condense and liquefy. After flowing through the air-conditioning refrigerant container 26, the high-pressure liquid refrigerant is decompressed and expanded by the air-conditioning expansion valve 27 adjusted to a predetermined opening degree, and becomes a low-temperature and low-pressure gas-liquid two-phase refrigerant, and then flows into the air-conditioning for utilization. Side heat exchanger 28. The gas-liquid two-phase refrigerant flowing into the air-conditioning use-side heat exchanger 28 absorbs heat from the high-temperature cold water flowing in the air-conditioning hot and cold water circulation circuit 8 and evaporates to become a low-pressure gas refrigerant. This low-pressure gas refrigerant flows into the suction port 21a of the air-conditioning compressor 21 through the four-way valve 22, and is recompressed by the air-conditioning compressor 21 to become a high-temperature and high-pressure gas refrigerant.

In the air-conditioning cold and hot water circulation circuit 8, the cold water that has dissipated heat to the air-conditioning refrigerant flowing in the air-conditioning use-side heat exchanger 28 passes through the air-conditioning cold and hot water piping 55a by driving the air-conditioning cold and hot water circulation pump 52, and It flows into the indoor heat exchanger 61. In the indoor heat exchanger 61, the cold water in the air-conditioning hot water circulation circuit 8 exchanges heat with the high-temperature air in the house 60, and the air in the house 60 is cooled. That is, the interior of the house 60 is cooled. At this time, the cold water flowing through the indoor heat exchanger 61 absorbs heat from the air in the house 60 to increase its temperature. The heated cold water flows through the cold and hot water circulation pump 52 for air conditioning to the cold and hot water pipes 55b and 55c for air conditioning, and is connected with the refrigerant circuit 5 for air conditioning while flowing through the use side heat exchanger 28 for air conditioning again. The flowing air conditioner is cooled by exchanging heat with the refrigerant.

On the other hand, in the hot water supply refrigerant circuit 6 , the high temperature and high pressure gas refrigerant compressed by the hot water supply compressor 41 flows into the hot water supply use side heat exchanger 42 . The high-temperature and high-pressure gas refrigerant flowing into the heat source side heat exchanger 42 for hot water supply dissipates heat to the water flowing in the hot water supply channel 9 to condense and liquefy. Next, the liquefied high-pressure refrigerant flows through the hot water supply refrigerant container 46 and is decompressed and expanded by the hot water supply expansion valve 43 adjusted to a predetermined opening degree to form a low-temperature and low-pressure gas-liquid two-phase refrigeration system. agent. The gas-liquid two-phase refrigerant absorbs heat from the air sent by the hot water supply outdoor fan 45 while flowing through the hot water supply heat source side heat exchanger 44 , and evaporates to become a low-pressure gas refrigerant. This low-pressure gas refrigerant flows into the suction port 41a of the hot water supply compressor 41, and is recompressed by the hot water supply compressor 41 to become a high temperature and high pressure gas refrigerant.

In the hot water supply channel 9 , the water flowing into the water supply port 78 flows through the hot water supply pipe 72 and is guided to the hot water supply use side heat exchanger 42 . The water that has flowed into the hot water supply use side heat exchanger 42 absorbs heat from the hot water supply refrigerant flowing in the hot water supply refrigerant circuit 6 in the hot water supply use side heat exchanger 42 to become high temperature. hot water. The hot water flows through the hot water supply pipe 73 and is stored in the hot water storage tank 70, and is guided from the hot water supply port 79 to the hot water supply load side according to a user's request.

In this operation mode No. 1, the flow path through which the refrigerant flows to the intermediate heat exchanger 23 is closed by the two-way valves 35a, 35b, 49b, and 49d, and there is no gap between the air-conditioning refrigerant and the hot water supply refrigerant. Perform heat exchange.

Next, the flows of the refrigerant and the heat transfer medium in the "heating/hot water supply individual operation mode" will be described in detail with reference to FIG. 5 .

In the air-conditioning refrigerant circuit 5 , the high-temperature and high-pressure gas refrigerant discharged from the discharge port 21 b of the air-conditioning compressor 21 flows into the air-conditioning use-side heat exchanger 28 through the four-way valve 22 . The high-temperature and high-pressure gas refrigerant flowing in the air-conditioning use-side heat exchanger 28 dissipates heat to the hot water flowing in the air-conditioning hot water circuit 8 to condense and liquefy. The high-pressure liquid refrigerant is decompressed and expanded by the air-conditioning expansion valve 27 adjusted to a predetermined opening degree to become a low-temperature and low-pressure gas-liquid two-phase refrigerant, and then flows into the air-conditioning utilization side through the air-conditioning refrigerant container 26 for heat exchange. device 24. The gas-liquid two-phase refrigerant flowing in the air-conditioning heat source side heat exchanger 24 absorbs heat from the air sent by the air-conditioning outdoor fan 25 and evaporates to become a low-pressure gas refrigerant. This low-pressure gas refrigerant flows into the suction port 21a of the air-conditioning compressor 21 through the four-way valve 22, and is recompressed by the air-conditioning compressor 21 to become a high-temperature and high-pressure gas refrigerant.

In the air-conditioning cold and hot water circulation circuit 8, the heated hot water absorbs heat from the air-conditioning refrigerant flowing in the air-conditioning utilization side heat exchanger 28, and passes through the air-conditioning cold and hot water circulation circuit 8 by driving the air-conditioning cold and hot water circulation pump 52. The water is piped 55 a and flows into the indoor heat exchanger 61 . In the indoor heat exchanger 61, the hot water in the cold/hot water circulation circuit 8 for air conditioning exchanges heat with the low-temperature air in the house 60, and the air in the house 60 is heated. That is, the interior of the house 60 is heated. At this time, the hot water flowing through the indoor heat exchanger 61 dissipates heat to the air in the house 60 to be cooled. The cooled hot water flows through the cold and hot water circulation pump 52 for the air conditioner to the hot and cold water pipes 55b and 55c for the air conditioner, and in the process of flowing through the use side heat exchanger 28 for the air conditioner again, it is connected with the refrigerant circuit for the air conditioner. 5. The flowing air conditioner heats up by exchanging heat with the refrigerant.

In addition, the flow of the refrigerant for hot water supply in the refrigerant circuit 6 for hot water supply and the flow of water in the hot water supply flow path 9 are the same as in the "cooling/hot water supply individual operation mode", so the description here is omitted. illustrate. In addition, in the "heating/hot water supply individual operation mode", the flow path through which the refrigerant flows to the intermediate heat exchanger 23 is closed by the two-way valves 35a, 35b, 49b, and 49d, and the air-conditioning refrigerant and heat There is no heat exchange between the refrigerants for water supply.

Next, the flow of the refrigerant and the heat transfer medium in the "scheduled operation mode" and the control in this operation mode will be described with reference to FIGS. 6 to 11 . In the dispatch operation mode, the control device 1a calculates and compares the heat dissipation amount required by the air-conditioning refrigerant circuit 5 and the heat absorption amount required by the hot water supply refrigerant circuit 6, and determines "Control 1" based on the comparison result. Mode", "Control 2 Mode", and "Control 3 Mode", and control the operation of the air-conditioning and hot water supply system according to the determination. Therefore, first, the procedure of the control processing performed by the control device 1a will be described with reference to FIGS. 6 to 8 .

When dispatch operation starts, first, in step S1, the control device 1a performs reception processing of various data. Specifically, the control device 1a receives data on the target hot water temperature (boiling temperature), target hot water volume (flow rate) and tap water temperature in the hot water supply cycle, and receives data on the target temperature (set temperature) in the air conditioning cycle, Data on target air volume and room temperature. In addition, the target hot water temperature and the target hot water amount of the hot water supply cycle are data input to the control device 1a through the setting of the remote controller, and the tap water temperature is data input from the temperature sensor TH1. Furthermore, the target temperature and the target air volume of the air-conditioning cycle are data input to the control device 1a through the setting of the remote controller, and the indoor temperature is data input from the temperature sensor TH20.

Next, it progresses to step S2, and the control apparatus 1a performs calculation processing based on the various data received in step S1. Specifically, the control device 1 a calculates the target capacity (Qh) in the hot water supply cycle, the target rotational speed of the hot water supply compressor 41 , the target discharge temperature (Td) of the hot water supply compressor 41 , and the The input (Whcomp) of the compressor 41, and calculate the target capacity (Qc) in the air-conditioning cycle, the target rotation speed of the air-conditioning compressor 21, the target evaporation temperature (Te) of the air-conditioning refrigerant, and the input of the air-conditioning compressor 21 ( Wccomp). Next, proceed to step S3, the control device 1a calculates the hot water supply heat absorption according to the difference between the target capacity (Qh) of the hot water supply cycle and the compressor input (Whcomp), and calculates the heat absorption amount according to the target capacity (Qc) of the air conditioning cycle and the compressor input (Wccomp) to calculate the cooling capacity of the air conditioner.

Next, proceeding to step S4, the control device 1a determines whether the hot water supply heat absorption calculated in step S3 is equal to the air-conditioning heat dissipation, that is, whether the current state is the third load state. In addition, in this step S4 , when the difference between the hot water supply heat absorption amount and the air-conditioning heat dissipation amount is within a predetermined numerical range, it is determined that both are equal. When it judges as Yes in step S4, it progresses to step S5, and the control apparatus 1a performs the process of "control 1 mode". Specifically, the control device 1a opens the two-way valves 35a, 35b, 49b, and 49d at the inlet and outlet of the intermediate heat exchanger 23, and closes the third expansion valve 49a and the fourth expansion valve at the inlet and outlet of the heat source side heat exchanger 44 for hot water supply. The expansion valve 49c closes the first expansion valve 35c and the second expansion valve 35d located at the inlet and outlet of the air-conditioning heat source side heat exchanger 24 . That is, since the amount of heat absorbed by the hot water supply is equal to the amount of heat released by the air conditioner, the control device 1 a is in a state where it can perform cooling operation and hot water supply operation using only the intermediate heat exchanger 23 .

Next, it progresses to step S6, and the control apparatus 1a controls operation|movement of a hot water supply cycle and an air conditioning cycle according to the calculation result of step S2. Specifically, the control device 1a controls the hot water supply compressor 41 to reach the target rotational speed in the hot water supply cycle, stops the hot water supply outdoor fan 45, and controls the valve opening of the hot water supply expansion valve 43 to reach the target speed. Target discharge temperature (Td). In addition, the control device 1a controls the air-conditioning compressor 21 to achieve a target rotation speed, stops the air-conditioning outdoor fan 25, and controls the valve opening of the air-conditioning expansion valve 27 to achieve a target evaporation temperature (Te) during the air-conditioning cycle. Then, it returns in the next step and skips the process of scheduling operation.

On the other hand, when it is determined as No in step S4 , the process proceeds to step S7 , and the control device 1 a determines whether or not the hot water supply heat absorption is smaller than the air-conditioning heat dissipation. When it is determined that the amount of heat absorbed by the hot water supply is less than the heat dissipation of the air conditioner, that is, when the current state is the first load state, the control device 1a performs the process of "control 2 mode", and when it is determined that the hot water supply When the amount of heat absorbed exceeds the heat dissipation amount of the air conditioner, that is, when the current state is the second load state, the control device 1a performs the process of "control 3 modes".

Next, processing in the control 2 mode will be described. In the processing of this control 2, as shown in FIG. 6, first, in step S8, the control device 1a opens the two-way valves 35a, 35b, 49b, and 49d at the inlet and outlet of the intermediate heat exchanger 23, and closes the two-way valves 35a, 35b, 49b, and 49d located at the hot water supply. The third expansion valve 49a and the fourth expansion valve 49c at the inlet and outlet of the heat source side heat exchanger 44 open the first expansion valve 35c and the second expansion valve 35d at the inlet and outlet of the heat source side heat exchanger 24 for air conditioning. That is, since the air-conditioning heat dissipation amount is larger than the hot-water supply heat absorption amount, the control device 1a is in a state of performing cooling operation and hot-water supply operation while radiating heat from the air-conditioning heat source side heat exchanger 24 to the atmosphere. The amount is the difference heat equivalent to the difference between the heat dissipation of the air conditioner and the heat absorption of the hot water supply.

Next, proceeding to step S9, the control device 1a performs reception processing of various data. Specifically, the control device 1a receives the data of the hot water supply heat absorption and the air-conditioning heat radiation calculated in step S3, and the data of the outside air temperature input from the temperature sensor TH19. Next, proceeding to step S10, the control device 1a calculates the target evaporation temperature (Te) of the refrigerant for hot water supply in the hot water supply cycle and the target evaporation temperature (Te) of the refrigerant for air conditioning in the air conditioning cycle based on various data received in step S9. The target condensation temperature (Tc).

Next, it progresses to step S11, and the control apparatus 1a controls operation|movement of a hot water supply cycle and an air conditioning cycle according to the calculation result of step S9. Specifically, the control device 1a controls the hot water supply compressor 41 to reach the target rotational speed in the hot water supply cycle, stops the hot water supply outdoor fan 45, and controls the valve opening of the hot water supply expansion valve 43 to reach the target speed. Target evaporation temperature (Te). Furthermore, the control device 1a controls the air-conditioning compressor 21 to achieve a target rotational speed in the air-conditioning cycle, controls the rotational speed of the air-conditioning outdoor fan 25 to achieve a target condensation temperature (Tc), and controls the valve opening of the air-conditioning expansion valve 27 to achieve Target condensation temperature (Tc).

Next, proceeding to step S12, the control device 1a determines whether or not the target evaporation temperature (Te) of the hot water supply cycle has been reached. When it is determined as Yes in step S12, the process proceeds to step S13, and the control device 1a determines whether or not the target condensation temperature (Tc) of the air-conditioning cycle has been reached. If it is determined to be Yes in step S13, the process proceeds to step S15, and the control device 1a confirms whether the operation of the hot water supply cycle reaches the target hot water supply capacity (Qh), and confirms whether the operation of the air conditioning cycle reaches the target air conditioning capacity ( Qc). And when it determines with Yes in step S15, it returns to the next step, and the process of a scheduled operation is skipped. In addition, when it determines with No in step S15, it returns to step S11.

On the other hand, when the determination in step S12 is No, the process returns to step S11, and the control device 1a adjusts the valve opening of the hot water supply expansion valve 43 until it reaches the target evaporation temperature (Te) of the hot water supply cycle. In this way, in the process of the control 2 mode, since the heat absorbed by the hot water supply is smaller than the heat released by the air conditioner, first, control is performed so that the hot water supply cycle with a small heat reaches the target evaporation temperature (Te). Next, when the determination in step S13 is No, the opening degrees of the first expansion valve 35 c and the second expansion valve 35 d are adjusted (slightly closed) in step S14 . Next, returning to step S11, the control device 1a adjusts the opening degrees of the first expansion valve 35c and the second expansion valve 35d until reaching the target condensation temperature (Tc) of the air-conditioning cycle. In this way, in the process of the control 2 mode, the control device 1a controls the operation of the air conditioning cycle after the hot water supply cycle reaches the target evaporation temperature (Te).

Here, the procedure for controlling the air-conditioning cycle to reach the target condensing temperature (Tc) is to first adjust the rotation speed of the air-conditioning outdoor fan 25 (step S11 ), and then the air-conditioning cycle does not reach the target condensing temperature (Tc). Tc) (in the case of No in step S14 ), the opening degrees of the first expansion valve 35 c and the second expansion valve 35 d located at the inlet and outlet of the air-conditioning heat source side heat exchanger 24 are auxiliary adjusted. That is, even if the control device 1a controls the rotational speed of the air-conditioning outdoor fan 25, the heat exchange amount of the air-conditioning heat source side heat exchanger 24 is equivalent to the difference between the hot water supply heat absorption amount and the air-conditioning heat dissipation amount obtained in step S3. When the difference between the difference heat is also out of the predetermined range, the openings of the first expansion valve 35c and the second expansion valve 35d are adjusted to compensate for the difference, thereby controlling to ensure the balance of the heat exchanged.

In the processing of the control mode 3, as shown in FIG. 7, first, in step S16, the control device 1a opens the two-way valves 35a, 35b, 49b, and 49d at the inlet and outlet of the intermediate heat exchanger 23, and opens the two-way valves 35a, 35b, 49b, and 49d located at the hot water supply. The third expansion valve 49a and the fourth expansion valve 49c at the inlet and outlet of the heat source side heat exchanger 44 close the first expansion valve 35c and the second expansion valve 35d at the inlet and outlet of the heat source side heat exchanger 24 for air conditioning. That is, since the amount of heat absorbed by the hot water supply is greater than the amount of heat released by the air conditioner, the control device 1a is in a state of performing cooling operation and hot water supply operation while absorbing heat from the atmosphere using the heat source side heat exchanger 44 for hot water supply. The amount of heat absorbed is the difference heat equivalent to the difference between the heat absorbed by the hot water supply and the heat released by the air conditioner.

Next, proceeding to step S17, the control device 1a performs reception processing of various data. Specifically, the control device 1a receives the data of the hot water supply heat absorption and the air-conditioning heat radiation calculated in step S3, and the data of the outside air temperature input from the temperature sensor TH19. Next, proceeding to step S18, the control device 1a calculates the target evaporation temperature (Te) of the refrigerant for hot water supply in the hot water supply cycle and the target evaporation temperature (Te) of the refrigerant for air conditioning in the air conditioning cycle based on the various data received in step S17. The target condensation temperature (Tc).

Next, it progresses to step S19, and the control apparatus 1a controls operation|movement of a hot water supply cycle and an air conditioning cycle according to the calculation result of step S18. Specifically, in the hot water supply cycle, the control device 1a controls the hot water supply compressor 41 to achieve a target rotation speed, controls the rotation speed of the hot water supply outdoor fan 45 to achieve a target evaporation temperature (Te), and controls the hot water supply The valve opening of the expansion valve 43 is used to achieve the target evaporation temperature (Te). In addition, the control device 1a controls the air-conditioning compressor 21 to achieve a target rotation speed, stops the air-conditioning outdoor fan 25, and controls the valve opening of the air-conditioning expansion valve 27 to achieve a target condensation temperature (Tc) during the air-conditioning cycle.

Next, it progresses to step S20, and the control apparatus 1a judges whether it has reached the target evaporation temperature (Tc) of an air-conditioning cycle. When it is determined as Yes in step S20, the process proceeds to step S21, and the control device 1a determines whether or not the target evaporation temperature (Te) of the hot water supply cycle has been reached. If it is determined to be Yes in step S21, it proceeds to step S23, and the control device 1a confirms whether the operation of the hot water supply cycle reaches the target hot water supply capacity (Qh), and confirms whether the operation of the air conditioning cycle reaches the target air conditioning capacity ( Qc). And when it is judged as Yes in step S23, it returns to the next step and skips the process of scheduled operation. In addition, when it determines with No in step S23, it returns to step S19.

On the other hand, when the determination in step S20 is No, the process returns to step S19, and the control device 1a adjusts the valve opening of the air-conditioning expansion valve 27 until it reaches the target condensation temperature (Tc) of the air-conditioning cycle. In this way, in the processing of the control 3 mode, since the air-conditioning heat radiation amount is smaller than the hot water supply heat absorption amount, first, control is performed so that the air-conditioning cycle with a small heat amount reaches the target condensation temperature (Tc). Next, when the determination in step S21 is No, the opening degrees of the third expansion valve 49 a and the fourth expansion valve 49 c are adjusted (slightly closed) in step S22 . Next, returning to step S19, the control device 1a adjusts the opening degrees of the third expansion valve 49a and the fourth expansion valve 49c until reaching the target evaporation temperature (Te) of the hot water supply cycle. Thus, in the processing of the control 3 mode, the control device 1a controls the operation of the hot water supply cycle after the air conditioning cycle reaches the target condensation temperature (Tc).

Here, the procedure for controlling the hot water supply cycle to reach the target evaporating temperature (Te) is first to adjust the rotation speed of the hot water supply outdoor fan 45 (step S19 ). If the target evaporation temperature (Te) has not been reached (in the case of No in step S21), the third expansion valve 49a and the fourth expansion valve located at the inlet and outlet of the heat source side heat exchanger 44 for hot water supply are auxiliary adjusted. 49c opening. That is, the control device 1a, even if the rotation speed of the outdoor fan 45 for hot water supply is controlled, the heat exchange amount of the heat source side heat exchanger 44 for hot water supply and the hot water supply and heat absorption amount obtained in step S3 and the air-conditioning In the case where the difference between the calorific values corresponding to the difference in heat dissipation is also outside the predetermined range, the opening degrees of the third expansion valve 49a and the fourth expansion valve 49d are adjusted to compensate for the difference, thereby performing control to ensure Balance of heat exchange.

Next, the flows of the refrigerant and the heat transfer medium in the scheduled operation mode will be described with reference to FIGS. 9 to 11 . First, "control 1 mode" is demonstrated using FIG. 9. FIG. In the control 1 mode, the first expansion valve 35c, the second expansion valve 35d, the third expansion valve 49a, and the fourth expansion valve 49c are closed, and the outdoor fan 25 for air conditioning and the outdoor fan 45 for hot water supply are stopped.

In the air-conditioning refrigerant circuit 5 , the high-temperature and high-pressure gas refrigerant discharged from the discharge port 21 b of the air-conditioning compressor 21 flows into the intermediate heat exchanger 23 through the four-way valve 22 . The high-temperature and high-pressure gas refrigerant flowing in the intermediate heat exchanger 23 condenses and liquefies by dissipating heat to the low-temperature hot water supply refrigerant flowing in the intermediate heat exchanger 23 . After the high-pressure liquid refrigerant flows into the air-conditioning refrigerant container 26, it is decompressed and expanded by the air-conditioning expansion valve 27 adjusted to a predetermined opening degree to become a low-temperature and low-pressure gas-liquid two-phase refrigerant, and then flows into the air-conditioning use. Side heat exchanger 28. The gas-liquid two-phase refrigerant flowing in the air-conditioning use-side heat exchanger 28 absorbs heat from the high-temperature cold water flowing in the air-conditioning hot and cold water circulation circuit 8 and evaporates to become a low-pressure gas refrigerant. This low-pressure gas refrigerant flows into the suction port 21a of the air-conditioning compressor 21 through the four-way valve 22, and is recompressed by the air-conditioning compressor 21 to become a high-temperature and high-pressure gas refrigerant.

In the air-conditioning cold and hot water circulation circuit 8, the cold water that has radiated heat to the air-conditioning refrigerant flowing in the air-conditioning use-side heat exchanger 28 passes through the air-conditioning cold and hot water piping 55a by driving the air-conditioning cold and hot water circulation pump 52, and It flows into the indoor heat exchanger 61. In the indoor heat exchanger 61, the cold water in the air-conditioning hot water circulation circuit 8 exchanges heat with the high-temperature air in the house 60, and the air in the house 60 is cooled. That is, the interior of the house 60 is cooled. At this time, the cold water flowing through the indoor heat exchanger 61 absorbs heat from the air in the house 60 to increase its temperature. The heated cold water flows to the cold and hot water pipes 55b and 55c for the air conditioner by the cold and hot water circulation pump 52 for the air conditioner, and flows in the refrigerant circuit 5 for the air conditioner while flowing again in the use side heat exchanger 28 for the air conditioner. The air conditioner is cooled by exchanging heat with the refrigerant.

On the other hand, in the hot water supply refrigerant circuit 6 , the high temperature and high pressure gas refrigerant compressed by the hot water supply compressor 41 flows into the hot water supply use side heat exchanger 42 . The high-temperature and high-pressure gas refrigerant flowing in the heat source side heat exchanger 42 for hot water supply condenses and liquefies by dissipating heat to the water flowing in the hot water supply channel 9 . Next, the liquefied high-pressure refrigerant flows through the hot water supply refrigerant container 46, is decompressed and expanded by the hot water supply expansion valve 43 adjusted to a predetermined opening degree, and becomes a low-temperature and low-pressure gas-liquid two-phase Refrigerant. The gas-liquid two-phase refrigerant absorbs heat from the high-temperature air-conditioning refrigerant flowing through the intermediate heat exchanger 23 while flowing through the intermediate heat exchanger 23 , and evaporates to become a low-pressure gas refrigerant. This low-pressure gas refrigerant flows into the suction port 41a of the hot water supply compressor 41, and is recompressed by the hot water supply compressor 41 to become a high temperature and high pressure gas refrigerant.

In the hot water supply channel 9 , the water flowing into the water supply port 78 flows through the hot water supply pipe 72 and is guided to the hot water supply use side heat exchanger 42 . The water that has flowed into the hot water supply use side heat exchanger 42 absorbs heat from the hot water supply refrigerant flowing in the hot water supply refrigerant circuit 6 in the hot water supply use side heat exchanger 42 to become high temperature. hot water. The hot water flows through the hot water supply pipe 73 and is stored in the hot water storage tank 70, and is guided from the hot water supply port 79 to the hot water supply load side according to a user's request.

In this way, in the control 1 mode, since the hot water supply heat absorption is equal to the air-conditioning heat dissipation, it is not necessary to use the heat source side heat exchanger 24 for the air conditioner and the heat source side heat exchanger 44 for hot water supply, but only use the intermediate heat exchange. By using the device 23, the operation of the air-conditioning and hot-water supply system utilizing the exhaust heat of the air-conditioning cycle for the hot-water supply cycle can be realized. Therefore, according to the first control mode, the exhaust heat of the air-conditioning cycle is not wasted, and the efficiency of the entire system can be realized.

Next, "control 2 mode" is demonstrated using FIG. 10. FIG. In the control 2 mode, the first expansion valve 35c and the second expansion valve 35d are opened, and the third expansion valve 49a and the fourth expansion valve 49c are closed. Furthermore, the outdoor fan 25 for air conditioning rotates, and the outdoor fan 45 for hot water supply stops.

In the air-conditioning refrigerant circuit 5 , the high-temperature and high-pressure gas refrigerant discharged from the discharge port 21 b of the air-conditioning compressor 21 flows into the intermediate heat exchanger 23 and the air-conditioning heat source side heat exchanger 24 through the four-way valve 22 . The high-temperature and high-pressure gas refrigerant flowing in the intermediate heat exchanger 23 radiates heat to the low-temperature hot water supply refrigerant flowing in the intermediate heat exchanger 23 to condense and liquefy, and at the same time, in the heat source side heat exchanger 24 for air conditioning, The flowing high-temperature and high-pressure gas refrigerant dissipates heat to the atmosphere sent from the air-conditioning outdoor fan 25 to condense and liquefy. After the high-pressure liquid refrigerant flows through the air-conditioning refrigerant container 26, it is decompressed and expanded by the air-conditioning expansion valve 27 adjusted to a predetermined opening degree to become a low-temperature and low-pressure gas-liquid two-phase refrigerant, and then flows into the air-conditioning refrigerant container 26. A side heat exchanger 28 is utilized. The gas-liquid two-phase refrigerant flowing in the air-conditioning use-side heat exchanger 28 absorbs heat from the high-temperature cold water flowing in the air-conditioning hot and cold water circulation circuit 8 and evaporates to become a low-pressure gas refrigerant. This low-pressure gas refrigerant flows into the suction port 21a of the air-conditioning compressor 21 through the four-way valve 22, and is recompressed by the air-conditioning compressor 21 to become a high-temperature and high-pressure gas refrigerant.

On the other hand, in the hot water supply refrigerant circuit 6 , the high temperature and high pressure gas refrigerant compressed by the hot water supply compressor 41 flows into the hot water supply use side heat exchanger 42 . The high-temperature and high-pressure gas refrigerant flowing in the heat source side heat exchanger 42 for hot water supply dissipates heat to the water flowing in the hot water supply channel 9 to be condensed and liquefied. Next, after the liquefied high-pressure liquid refrigerant flows through the hot water supply refrigerant container 46, it is decompressed and expanded by the hot water supply expansion valve 43 adjusted to a predetermined opening degree, and becomes a low-temperature low-pressure gas-liquid two. phase refrigerant. The gas-liquid two-phase refrigerant absorbs heat from the high-temperature air-conditioning refrigerant flowing through the intermediate heat exchanger 23 while flowing through the intermediate heat exchanger 23 , and evaporates to become a low-pressure gas refrigerant. This low-pressure gas refrigerant flows into the suction port 41a of the hot water supply compressor 41, and is recompressed by the hot water supply compressor 41 to become a high temperature and high pressure gas refrigerant.

In addition, the flow of cold water in the air-conditioning cold and hot water circulation circuit 8 and the flow of water in the hot water supply channel 9 in the control 2 mode are the same as those in the control 1 mode, so the description here is omitted.

In this way, in the control 2 mode, since the heat dissipation of the air conditioner is larger than the heat absorption of the hot water supply, heat is released from the heat source side heat exchanger 24 for the air conditioner to the atmosphere. The difference in heat absorption is equivalent to the difference in heat. At this time, in the hot water supply cycle, the heat source side heat exchanger 44 for hot water supply is not used. That is, in the hot water supply cycle, it is possible to operate the air conditioning hot water supply system using the exhaust heat of the air conditioning cycle in the hot water supply cycle using only the intermediate heat exchanger 23 . Therefore, according to the two control modes, the exhaust heat of the air-conditioning cycle is not wasted, and the efficiency of the entire system can be realized.

Next, "control 3 mode" is demonstrated using FIG. 11. FIG. In the control 3 mode, the first expansion valve 35c and the second expansion valve 35d are closed, and the third expansion valve 49a and the fourth expansion valve 49c are opened. Then, the outdoor fan 25 for air conditioning is stopped, and the outdoor fan 45 for hot water supply is rotated.

In the air-conditioning refrigerant circuit 5 , the high-temperature and high-pressure gas refrigerant discharged from the discharge port 21 b of the air-conditioning compressor 21 flows into the intermediate heat exchanger 23 through the four-way valve 22 . The high-temperature and high-pressure gas refrigerant flowing in the intermediate heat exchanger 23 condenses and liquefies by dissipating heat to the low-temperature hot water supply refrigerant flowing in the intermediate heat exchanger 23 . After the high-pressure liquid refrigerant flows through the air-conditioning refrigerant container 26, it is decompressed and expanded by the air-conditioning expansion valve 27 adjusted to a predetermined opening degree to become a low-temperature and low-pressure gas-liquid two-phase refrigerant, and then flows into the air-conditioning refrigerant container 26. A side heat exchanger 28 is utilized. The gas-liquid two-phase refrigerant flowing in the air-conditioning use-side heat exchanger 28 absorbs heat from the high-temperature cold water flowing in the air-conditioning hot and cold water circulation circuit 8 and evaporates to become a low-pressure gas refrigerant. This low-pressure gas refrigerant flows into the suction port 21a of the air-conditioning compressor 21 through the four-way valve 22, and is recompressed by the air-conditioning compressor 21 to become a high-temperature and high-pressure gas refrigerant.

On the other hand, in the hot water supply refrigerant circuit 6 , the high temperature and high pressure gas refrigerant compressed by the hot water supply compressor 41 flows into the hot water supply use side heat exchanger 42 . The high-temperature and high-pressure gas refrigerant flowing in the heat source side heat exchanger 42 for hot water supply condenses and liquefies by dissipating heat to the water flowing in the hot water supply channel 9 . Next, the liquefied high-pressure refrigerant flows through the hot water supply refrigerant container 46, is decompressed and expanded by the hot water supply expansion valve 43 adjusted to a predetermined opening degree, and becomes a low-temperature and low-pressure gas-liquid two-phase Refrigerant. During the process of the gas-liquid two-phase refrigerant flowing through the intermediate heat exchanger 23 and the heat source side heat exchanger 44 for hot water supply, the high-temperature air-conditioning refrigerant flowing through the intermediate heat exchanger 23 and the hot water The air output from the outdoor fan 45 for supply absorbs heat and evaporates to become a low-pressure gas refrigerant. This low-pressure gas refrigerant flows into the suction port 41a of the hot water supply compressor 41, and is recompressed by the hot water supply compressor 41 to become a high temperature and high pressure gas refrigerant.

In addition, the flow of cold water in the air-conditioning cold and hot water circulation circuit 8 and the flow of water in the hot water supply channel 9 in the control 3 mode are the same as those in the control 1 mode, and thus descriptions thereof are omitted here.

In this way, in the control 3 mode, since the heat absorbed by the hot water supply is larger than the heat released by the air conditioner, the heat source side heat exchanger 44 for hot water supply absorbs heat from the atmosphere, and the amount of absorbed heat is equal to that of the hot water supply. The difference between heat absorption and air-conditioning heat dissipation is equivalent to the difference in heat. At this time, the air-conditioning heat source side heat exchanger 24 is not used in the air-conditioning cycle. That is, the exhaust heat of the air conditioning cycle is radiated to the hot water supply cycle only through the intermediate heat exchanger 23 . In other words, all the exhaust heat of the air conditioning cycle is used in the hot water supply cycle. Therefore, according to the three control modes, the exhaust heat of the air-conditioning cycle is not wasted, and the efficiency of the entire system can be realized.

Next, the flows of the refrigerant and the heat transfer medium in the "forced heating operation mode" will be described in detail with reference to FIG. 12 . In the forced heating operation mode, the two-way valves 35a and 35b are opened, the two-way valves 49b and 49d are closed, and the expansion valves 35c, 35d, 49a and 49c are opened. Therefore, the refrigerant for hot water supply does not flow to the intermediate heat exchanger 23, but flows only to the heat source side heat exchanger 44 for hot water supply, and the refrigerant for air conditioning flows to the intermediate heat exchanger 23 to exchange heat with the heat source side for air conditioning. device 24 on both sides.

In the air-conditioning refrigerant circuit 5 , the high-temperature and high-pressure gas refrigerant discharged from the discharge port 21 b of the air-conditioning compressor 21 flows into the air-conditioning use-side heat exchanger 28 through the four-way valve 22 . The high-temperature and high-pressure gas refrigerant flowing in the air-conditioning use-side heat exchanger 28 dissipates heat to the hot water flowing in the air-conditioning hot water circuit 8 to condense and liquefy. The high-pressure liquid refrigerant is decompressed and expanded by the air-conditioning expansion valve 27 adjusted to a predetermined opening degree to become a low-temperature and low-pressure gas-liquid two-phase refrigerant, and then flows into the air-conditioning heat source side through the air-conditioning refrigerant container 26 for heat exchange. Device 24 and intermediate heat exchanger 23. The gas-liquid two-phase refrigerant flowing in the air-conditioning heat source side heat exchanger 24 absorbs heat from the air sent by the air-conditioning outdoor fan 25 and evaporates to become a low-pressure gas refrigerant. On the other hand, the gas-liquid two-phase refrigerant flowing in the intermediate heat exchanger 23 absorbs some heat from the plate through which the hot water supply refrigerant does not flow, evaporates, and becomes a low-pressure gas refrigerant. This low-pressure gas refrigerant flows into the suction port 21a of the air-conditioning compressor 21 through the four-way valve 22, and is recompressed by the air-conditioning compressor 21 to become a high-temperature and high-pressure gas refrigerant.

On the other hand, in the hot water supply refrigerant circuit 6 , the high temperature and high pressure gas refrigerant compressed by the hot water supply compressor 41 flows into the hot water supply use side heat exchanger 42 . The high-temperature and high-pressure gas refrigerant flowing in the heat source side heat exchanger 42 for hot water supply condenses and liquefies by dissipating heat to the water flowing in the hot water supply channel 9 . Next, after the liquefied high-pressure liquid refrigerant flows through the hot water supply refrigerant container 46, it is decompressed and expanded by the hot water supply expansion valve 43 adjusted to a predetermined opening degree, and becomes a low-temperature low-pressure gas-liquid two. phase refrigerant. The gas-liquid two-phase refrigerant absorbs heat from the air sent by the hot water supply outdoor fan 45 while flowing through the hot water supply heat source side heat exchanger 44 , and evaporates to become a low-pressure gas refrigerant. Next, the low-pressure gas refrigerant flowing out of the heat source side heat exchanger 44 for hot water supply flows into the suction port 41a of the compressor 41 for hot water supply, and is recompressed by the compressor 41 for hot water supply to become high-temperature and high-pressure gas refrigerant. agent.

In addition, the flow of hot water in the air-conditioning refrigerant circuit 8 is the same as in the "heating/hot water supply individual operation mode", so the description here is omitted. In addition, the flow of water in the hot water supply channel 9 is the same as in the "cooling/hot water supply independent operation mode", and therefore the description here is omitted.

Here, an important feature of the forced heating operation mode is that the intermediate heat exchanger 23 through which no hot water supply refrigerant flows is used as an evaporator in the air-conditioning cycle. That is, this mode is characterized in that heat is also absorbed from the heat transfer surface of the hollow plate, and the performance of the air-conditioning refrigerant circuit 5 for heating operation is also slightly improved. Therefore, when it is difficult to sufficiently heat the interior of the house 60 in winter, it is effective to perform the operation in the forced heating operation mode.

Next, the flow of the refrigerant and the heat transfer medium in the "instant boiling operation mode" and the control in this operation mode will be described. However, the flow of the refrigerant and the heat transfer medium is different from the "control 3 mode" of the scheduled operation mode. (See FIG. 11 ) are the same, so the description here will be omitted, and only the control of the instant boiling operation mode will be described with reference to FIGS. 13 and 14 .

When the instant boiling operation mode starts, first, in step S101, the control device 1a determines whether or not the tank temperature input from the temperature sensor TH21 is equal to or lower than a temperature at which hot water can be supplied. When Yes in step S101, the control device 1a determines in step S102 whether the hot water supply heat absorption is greater than the air-conditioning heat dissipation. When the hot water supply heat absorption is greater than the air-conditioning heat dissipation, proceed to step S103, the control device 1a opens the two-way valves 35a, 35b, 49b, 49d at the inlet and outlet of the intermediate heat exchanger 23, and opens the two-way valves 35a, 35b, 49b, 49d located at the hot water supply. The third expansion valve 49a and the fourth expansion valve 49c at the inlet and outlet of the heat source side heat exchanger 44 close the first expansion valve 35c and the second expansion valve 35d at the inlet and outlet of the heat source side heat exchanger 24 for air conditioning. That is, since the amount of heat absorbed by the hot water supply is greater than the amount of heat released by the air conditioner, the control device 1a is in a state where it can perform cooling operation and hot water supply operation while absorbing heat from the atmosphere using the heat source side heat exchanger 44 for hot water supply. The amount of absorbed heat is a differential heat equivalent to the difference between the heat absorbed by hot water supply and the heat released by the air conditioner.

Next, proceeding to step S104, the control device 1a performs reception processing of various data. Specifically, the control device 1 a receives the target hot water amount, target hot water temperature, tap water temperature (input from temperature sensor TH1 ), and outdoor temperature (input from temperature sensor TH19 ) in the hot water supply cycle. Furthermore, the control device 1 a receives the target temperature, the target air volume, the indoor temperature (input from the temperature sensor TH20 ), and the outdoor temperature (input from the temperature sensor TH19 ) in the air-conditioning cycle. Next, proceeding to step S105, the control device 1a calculates the target capacity of the air-conditioning cycle, the rotational speed of the air-conditioning compressor 21, the rotational speed of the outdoor fan 25 for air-conditioning, the Discharge temperature, power consumption and heat dissipation of the air-conditioning compressor 21 .

Next, advance to step S106, the control device 1a receives the data of the heat dissipation of the air-conditioning cycle calculated in step S105, and receives the target amount of hot water in the hot water supply cycle, the target hot water temperature, the tap water temperature, and the outdoor temperature. The data. Then, proceeding to the next step S107, the control device 1a calculates the target capacity of the hot water supply cycle, the rotation speed of the hot water supply compressor 41, the rotation speed of the hot water supply outdoor fan 45, and the rotation speed of the hot water supply compressor 41. The discharge temperature and the power consumption of the compressor 21 for hot water supply. Next, proceeding to step S108, the control device 1a controls the operation of the hot water supply cycle and the air conditioning cycle according to the calculation result obtained just now.

Specifically, in the hot water supply cycle, the control device 1a controls the hot water supply compressor 41 to achieve the target rotation speed, controls the hot water supply outdoor fan 45 to achieve the target rotation speed, and controls the hot water supply expansion valve 43 to achieve the target rotation speed. valve opening to achieve the target capacity. In addition, the control device 1a controls the air-conditioning compressor 21 to achieve a target rotational speed, stops the air-conditioning outdoor fan 25, and controls the valve opening of the air-conditioning expansion valve 27 to achieve a target capacity during the air-conditioning cycle.

Next, the process proceeds to step S109, and the control device 1a determines whether the hot water supply cycle and the air conditioning cycle have respectively reached the target capacities. When it is determined as Yes in step S109, the process proceeds to step S110, and the control device 1a determines whether it is necessary to supply hot water and add water. If it is necessary to add water, proceed to step S111, the control device 1a closes the container return valve (not shown), and opens the water circuit valve (not shown) to add water. On the other hand, when step S110 is No, it progresses to step S112, and the control apparatus 1a closes the container return valve (not shown), and closes the water circuit valve (not shown). That is, water addition was not performed. Next, in step S113 , hot water is supplied from a faucet on the hot water supply load side (not shown) through the hot water supply port 79 . Then, it returns to the next step and skips the processing of the instant boiling operation mode. In addition, when it is No in step S109, return to step S108, and when it is No in step S101 and No in step S102, return and skip the instant boiling operation mode. deal with.

In this way, in the instantaneous boiling operation mode, both the intermediate heat exchanger 23 and the heat source side heat exchanger 44 for hot water supply are operated as evaporators in the hot water supply cycle, so it can be said that it can also meet the needs. An operation mode that requires high hot water supply, such as when there is a large amount of hot water.

Next, the flow of refrigerant and heat transfer medium in the "quick cooling operation mode" and the control in this operation mode will be described. (See FIG. 10 ) are the same, so the description here will be omitted, and only the control of the rapid cooling operation mode will be described with reference to FIG. 15 .

When the rapid cooling operation mode is started, first, in step S201, the control device 1a determines whether or not the cooling request is equal to or greater than the maximum capacity of the cooling-only operation. In the case of Yes in step S201, the control device 1a determines in step S202 whether the air-conditioning heat radiation amount is larger than the hot water supply heat absorption amount. When the air-conditioning heat dissipation is greater than the hot water supply heat absorption, proceed to step S203, the control device 1a opens the two-way valves 35a, 35b, 49b, 49d at the inlet and outlet of the intermediate heat exchanger 23, and closes the two-way valves 35a, 35b, 49b, 49d located at the hot water supply. The third expansion valve 49a and the fourth expansion valve 49c at the inlet and outlet of the heat source side heat exchanger 44 open the first expansion valve 35c and the second expansion valve 35d at the inlet and outlet of the heat source side heat exchanger 24 for air conditioning. That is, since the air-conditioning heat dissipation amount is larger than the hot-water supply heat absorption amount, the control device 1a is in a state capable of performing cooling operation and hot-water supply operation while radiating heat from the air-conditioning heat source side heat exchanger 24 to the atmosphere. The amount is the difference heat equivalent to the difference between the heat absorbed by the hot water supply and the heat released by the air conditioner.

Next, proceeding to step S204, the control device 1a performs reception processing of various data. Specifically, the control device 1 a receives the target hot water amount, target hot water temperature, tap water temperature (input from temperature sensor TH1 ), and outdoor temperature (input from temperature sensor TH19 ) in the hot water supply cycle. Furthermore, the control device 1 a receives data of target temperature, target air volume, indoor temperature (input from temperature sensor TH20 ), and outdoor temperature (input from temperature sensor TH19 ) in the air-conditioning cycle. Next, proceeding to step S205, the control device 1a calculates the target capacity of the air-conditioning cycle, the discharge temperature of the air-conditioning compressor 21, the power consumption and the heat dissipation of the air-conditioning compressor 21 based on the various data received in step S204.

Next, advance to step S206, the control device 1a receives the data of the heat dissipation of the air-conditioning cycle calculated in step S205, and receives the target amount of hot water in the hot water supply cycle, the target hot water temperature, the tap water temperature, and the outdoor temperature. The data. Then, proceeding to the next step S207, the control device 1a calculates the target capacity of the hot water supply cycle, the rotational speed of the hot water supply compressor 41, the rotational speed of the hot water supply outdoor fan 45, and the discharge rate of the hot water supply compressor 41. The temperature and the power consumption of the compressor 21 for hot water supply. Next, proceed to step S208, and the control device 1a controls the operation of the hot water supply cycle and the air conditioning cycle according to the calculation result obtained just now.

Specifically, in the hot water supply cycle, the control device 1a controls the hot water supply compressor 41 to reach a target rotational speed, controls to stop the hot water supply outdoor fan 45, and controls the valve of the hot water supply expansion valve 43. opening to achieve the target capacity. Moreover, in the air-conditioning cycle, the control device 1a controls the air-conditioning compressor 21 to reach a predetermined rotation speed, controls the rotation speed of the air-conditioning outdoor fan 25 to reach a predetermined rotation speed, and controls the valve opening of the air-conditioning expansion valve 27 to achieve a target rotation speed. ability. Here, although the predetermined rotation speed of the air-conditioning compressor 21 is set as the maximum use rotation speed, it is not limited to the maximum rotation speed. Moreover, although the predetermined rotational speed of the air-conditioning outdoor fan 25 is also set as the maximum operating rotational speed, it is not limited to the maximum rotational speed.

Next, the process proceeds to step S209, and the control device 1a determines whether the hot water supply cycle and the air conditioning cycle have respectively reached the target capacities. When it is determined as Yes in step S209, the process returns to the next step, and the process of the rapid cooling operation mode is skipped. In addition, when it is No in step S209, return to step S208, and when it is No in step S201 and No in step S202, return and skip the rapid cooling operation mode. deal with.

In this way, in the rapid cooling operation mode, both the intermediate heat exchanger 23 and the air-conditioning heat source side heat exchanger 24 are operated as condensers in the air-conditioning cycle. Refrigeration is the maximum capacity cooling requirement for stand-alone operation.

Next, the flow of refrigerant and heat transfer medium in the "no-exhaust hot air operation mode" and the control in this operation mode will be described. However, the flow of refrigerant and heat transfer medium is different from the "control 1 mode" of the dispatch operation mode. ” (refer to FIG. 9 ), so the description here is omitted, and only the control of the non-exhaust hot air operation mode will be described with reference to FIGS. 16 and 17 . The important feature of this non-exhaust hot air operation mode is that even when the heat dissipation of the air conditioner is greater than the heat absorbed by the hot water supply, the capacity (load) of the hot water supply operation is increased in a manner that matches the heat dissipation of the air conditioner, and Control to avoid heat rejection from refrigeration. That is, in the non-exhaust hot air operation mode, the heat of the difference corresponding to the difference between the air-conditioning heat dissipation amount and the hot water supply heat absorption amount is not released to the atmosphere through the heat source side heat exchanger 24 for air conditioning, but The load of the air conditioner is supplied to realize the heat balance between the amount of heat radiated by the air conditioner and the amount of heat absorbed by the hot water supply, so that the heat exchange of the intermediate heat exchanger 23 can be used to perform cooling operation and The hot water supply is running. Next, the control thereof will be described.

When the no-exhaust hot air operation mode is started, first, in step S301, the control device 1a determines whether the heat dissipation of the air conditioner is greater than the heat absorption of the hot water supply. When the air-conditioning heat dissipation is greater than the hot water supply heat absorption, proceed to step S302, the control device 1a opens the two-way valves 35a, 35b, 49b, 49d at the inlet and outlet of the intermediate heat exchanger 23, and closes the two-way valves 35a, 35b, 49b, 49d located at the hot water supply. The third expansion valve 49a and the fourth expansion valve 49c at the inlet and outlet of the heat source side heat exchanger 44 close the first expansion valve 35c and the second expansion valve 35d at the inlet and outlet of the heat source side heat exchanger 24 for air conditioning.

Next, proceeding to step S303, the control device 1a performs reception processing of various data. Specifically, the control device 1 a receives the target hot water amount, target hot water temperature, tap water temperature (input from temperature sensor TH1 ), and outdoor temperature (input from temperature sensor TH19 ) in the hot water supply cycle. Furthermore, the control device 1 a receives data of a target temperature, a target air volume, an indoor temperature (input from the temperature sensor TH20 ), and an outdoor temperature (input from the temperature sensor TH19 ) in the air-conditioning cycle. Next, proceeding to step S304, the control device 1a calculates the target capacity of the air-conditioning cycle, the rotational speed of the air-conditioning compressor 21, the rotational speed of the outdoor fan 25 for air-conditioning, the Discharge temperature, power consumption and heat dissipation of the air-conditioning compressor 21 .

Next, proceed to step S305, the control device 1a receives the data of the heat dissipation of the air-conditioning cycle calculated in step S304, and receives the target amount of hot water in the hot water supply cycle, the target hot water temperature, the tap water temperature, and the outdoor temperature. The data. Then, proceeding to the next step S306, the control device 1a calculates the target capacity of the hot water supply cycle, the rotational speed of the hot water supply compressor 41, the rotational speed of the hot water supply outdoor fan 45, and the discharge rate of the hot water supply compressor 41. temperature. Next, proceed to step S307, and the control device 1a controls the operation of the hot water supply cycle and the air conditioning cycle according to the calculation result obtained just now.

Specifically, in the hot water supply cycle, the control device 1a controls the hot water supply compressor 41 to reach a target rotational speed, controls to stop the hot water supply outdoor fan 45, and controls the valve of the hot water supply expansion valve 43. opening to achieve the target capacity. In addition, the control device 1a controls the air-conditioning compressor 21 to achieve a target rotational speed, controls the rotational speed of the air-conditioning outdoor fan 25 to achieve the target rotational speed, and controls the valve opening of the air-conditioning expansion valve 27 to achieve the target capacity during the air-conditioning cycle.

Next, the process proceeds to step S308, and the control device 1a determines whether the hot water supply cycle and the air conditioning cycle have respectively reached the target capacities. When the determination in step S308 is Yes, the process proceeds to step S309, and the control device 1a determines whether the hot water stored in the hot water storage tank 70 has reached the hot water storage capacity (the amount that can be stored in the hot water storage tank 70) . When the hot water storage amount has not been reached (in the case of No in step S309 ), the operation is continued as it is (step S310 ), and the process returns to step S309 .

On the other hand, if Yes in step S309, the process proceeds to the next step S311, and the control device 1a opens the drain valve 71b to discharge the hot water in the hot water storage tank 70 from the drain pipe 71a to the outside. Next, the control device 1a proceeds to step S312, and stops the operation of the air conditioning cycle. That is, the control device 1 a stops the operation of the air-conditioning compressor 21 and the air-conditioning outdoor fan 25 . Next, proceed to step S313, the control device 1a opens the third expansion valve 49a and the fourth expansion valve 49c located at the inlet and outlet of the heat source side heat exchanger 44 for hot water supply, and closes the two-way valve 49b at the inlet and outlet of the intermediate heat exchanger 23 , 49d.

Next, the control device 1a proceeds to step S314 to receive various data. Specifically, the control device 1a receives the current time in the hot water supply cycle, the target time for boiling completion, the temperature in the hot water storage tank (input from the temperature sensor TH21), the tap water temperature (input from the temperature sensor TH1), and the outdoor temperature. (input from temperature sensor TH19). Next, proceeding to step S315, the control device 1a calculates the target capacity of the hot water supply cycle, the rotational speed of the hot water supply compressor 41, the rotational speed of the hot water supply outdoor fan 45, The discharge temperature of the hot water supply compressor 21 , the power consumption of the hot water supply compressor 21 , and the valve opening of the hot water supply expansion valve 43 . Next, proceeding to step S316, the control device 1a controls the operation of the hot water supply cycle according to the calculation result obtained just now. Specifically, the control device 1 a controls the hot water supply compressor 41 so as to achieve a target rotation speed, and controls the rotation speed of the hot water supply outdoor fan 45 so that the target rotation speed is achieved during the hot water supply cycle. Then, return to the next step, and skip the process of the non-exhaust hot air operation mode. In addition, when it is No in step S308, it returns to step S307, and when it is No in step S301, it returns and skips the process of the non-exhaust hot air operation mode.

In this way, the non-exhaust hot air operation mode uses the intermediate heat exchanger 23 as an evaporator in the hot water supply cycle, and even if the air-conditioning heat dissipation is greater than the hot water supply heat absorption, it can be improved in a manner that matches the air-conditioning heat dissipation. The capacity (load) of the hot water supply operation is to dissipate the exhaust heat from the air conditioner to the hot water supply cycle to perform the hot water supply operation. In addition, in the non-exhaust hot air operation mode, when the hot water storage tank 70 is filled with hot water, the hot water is discharged to the outside from the drain pipe 71a. That is, the exhaust heat of the air conditioner is temporarily used to boil hot water, and then the excess hot water is discharged to the outside, so that the exhaust heat of the air conditioner can be dissipated to the outside air. Therefore, this non-exhaust hot air operation mode can respond to the following requirements: for example, since the windows of nearby houses are open, if the outdoor fan 25 for air conditioning is running, hot air may enter from the window, so it is desirable to avoid the outdoor fan 25 for air conditioning from rotating as much as possible. run.

Next, the flow of the refrigerant and the heat transfer medium in the "energy-saving operation mode" and the control in this operation mode will be described. However, the flow of the refrigerant and the heat transfer medium is different from the "control 1 mode" ( 9 ), the description here is omitted, and only the control of the energy-saving operation mode will be described with reference to FIGS. 18 and 19 . In this energy-saving operation mode, the control device 1 a operates the system as it is in the third load state in which the hot water supply heat absorption amount is equal to the air-conditioning heat dissipation amount. On the other hand, in the first load state in which the heat dissipation of the air conditioner is greater than the heat absorption of the hot water supply, or in the second load state in which the heat absorption of the hot water supply is greater than the heat dissipation of the air conditioner, the control device 1a controls the hot water supply operation to reach the second load state. Three load states. In addition, the control device 1a performs the hot water supply operation in consideration of the current time, the remaining time, and the operating capacity so that the target hot water amount and target hot water temperature are reached by the target time, and the control device 1a also performs the cooling operation as necessary. The system is controlled to stop the energy-saving operation mode and switch to the normal exhaust heat recovery operation (that is, the dispatch operation mode).

When the energy-saving operation mode starts, first, in step S401, the control device 1a determines whether the heat dissipation of the air conditioner and the heat absorption of hot water supply are equal (whether the difference between the heat dissipation of the air conditioner and the heat absorption of hot water supply is within a predetermined range). When the air-conditioning heat dissipation is equal to the hot water supply heat absorption, proceed to step S402, the control device 1a opens the two-way valves 35a, 35b, 49b, 49d at the inlet and outlet of the intermediate heat exchanger 23, and closes the two-way valves 35a, 35b, 49b, 49d located at the hot water supply. The third expansion valve 49a and the fourth expansion valve 49c at the inlet and outlet of the heat source side heat exchanger 44 close the first expansion valve 35c and the second expansion valve 35d at the inlet and outlet of the heat source side heat exchanger 24 for air conditioning. That is, since the hot water supply heat absorption and the air conditioning heat dissipation are equal and balanced, the control device 1 a can perform cooling operation and hot water supply operation using only the intermediate heat exchanger 23 .

Next, proceeding to step S403, the control device 1a performs reception processing of various data. Specifically, the control device 1 a receives data of target temperature, target air volume, target air volume, indoor temperature (input from temperature sensor TH20 ), and outdoor temperature (input from temperature sensor TH19 ) in the air-conditioning cycle. Next, proceeding to step S404, the control device 1a calculates the target capacity of the air-conditioning cycle, the rotational speed of the air-conditioning compressor 21, the rotational speed of the outdoor fan 25 for air-conditioning, and the speed of the air-conditioning compressor 21 based on the various data received in step S403. Discharge temperature, power consumption and heat dissipation of the air-conditioning compressor 21 .

Next, advance to step S405, the control device 1a receives the data of the heat dissipation of the air-conditioning cycle calculated in step S404, and receives the target amount of hot water in the hot water supply cycle, the target hot water temperature, the tap water temperature, and the outdoor temperature. The data. Next, proceeding to step S406, the control device 1a calculates the target capacity of the hot water supply cycle, the rotational speed of the hot water supply compressor 41, the rotational speed of the hot water supply outdoor fan 45, the discharge temperature of the hot water supply compressor 41, and Power consumption of the compressor 41 for hot water supply. Next, proceed to step S407, and the control device 1a controls the operation of the hot water supply cycle and the air conditioning cycle according to the calculation result obtained just now.

Specifically, in the hot water supply cycle, the control device 1a controls the hot water supply compressor 41 to reach a target rotational speed, controls to stop the hot water supply outdoor fan 45, and controls the valve of the hot water supply expansion valve 43. opening to achieve the target capacity. In the air-conditioning cycle, the control device 1a controls the air-conditioning compressor 21 to achieve a target rotational speed, controls to stop the air-conditioning outdoor fan 25, and controls the valve opening of the air-conditioning expansion valve 27 to achieve a target capacity.

Next, the process proceeds to step S408, and the control device 1a determines whether the hot water supply cycle and the air conditioning cycle respectively reach the target capacity. When the determination is Yes in step S408, the process proceeds to step S409, and the control device 1a stops the operation of the air conditioning cycle and starts the hot water supply independent operation only by the hot water supply cycle. That is, the control device 1 a stops the operation of the air-conditioning compressor 21 and the air-conditioning outdoor fan 25 . Next, proceed to step S410, the control device 1a opens the third expansion valve 49a and the fourth expansion valve 49c located at the inlet and outlet of the heat source side heat exchanger 44 for hot water supply, and closes the two-way valve 49b at the inlet and outlet of the intermediate heat exchanger 23 , 49d.

Next, the control device 1a proceeds to step S411 to receive various data. Specifically, the control device 1a receives the current time in the hot water supply cycle, the target time for boiling completion, the temperature in the hot water storage tank (input from the temperature sensor TH21), the tap water temperature (input from the temperature sensor TH1), and the outdoor temperature. (input from temperature sensor TH19). Next, proceeding to step S412, the control device 1a calculates the target capacity of the hot water supply cycle, the rotational speed of the hot water supply compressor 41, the rotational speed of the hot water supply outdoor fan 45, The discharge temperature of the hot water supply compressor 21 , the power consumption of the hot water supply compressor 21 , and the valve opening of the hot water supply expansion valve 43 .

Next, proceed to step S413, and the control device 1a controls the operation of the hot water supply cycle according to the calculation result obtained just now. Specifically, the control device 1 a controls the hot water supply compressor 41 so as to achieve a target rotation speed, and controls the rotation speed of the hot water supply outdoor fan 45 so that the target rotation speed is achieved during the hot water supply cycle. Then, it returns in the next step, and the process of the energy-saving operation mode is skipped. In addition, when it is No in step S408, it returns to step S407, and when it is No in step S401, it returns and skips the process of an energy-saving operation mode. In this way, the energy-saving operation mode utilizes all the exhaust heat of the air conditioner for the hot water supply operation and operates, so it can be said to be an operation mode excellent in energy saving.

As mentioned above, according to the air-conditioning hot water supply system according to the first embodiment of the present invention described above, it is possible to use the intermediate heat exchanger 23 in the air-conditioning cycle when the air-conditioning heat dissipation is larger than the hot-water supply heat absorption. The cooling operation is performed while dissipating heat from the heat source side heat exchanger 24 for air conditioning, and the hot water supply operation is performed while absorbing heat from the intermediate heat exchanger 23 in the hot water supply cycle. Moreover, when the air-conditioning heat dissipation is smaller than the hot water supply heat absorption, in the air-conditioning cycle, cooling operation is performed while using the intermediate heat exchanger 23 to dissipate heat; 23 and the heat source side heat exchanger 44 for hot water supply perform hot water supply operation while absorbing heat. Furthermore, heat transfer between the air-conditioning cycle and the hot-water supply cycle can be performed via the intermediate heat exchanger 23 when the air-conditioning heat radiation amount is equal to the hot-water supply heat absorption amount, and the cooling operation and the hot-water supply operation can be performed simultaneously.

That is, according to the air-conditioning and hot-water supply system according to the present embodiment, it is possible to perform cooling operation and hot-water supply operation corresponding to the magnitude relationship between the air-conditioning heat radiation amount and the hot-water supply heat absorption amount.

Furthermore, according to the air-conditioning and hot-water supply system of the present embodiment, heat exchange is performed by controlling the heat-source-side heat exchanger 24 for air-conditioning or the heat-source-side heat exchanger 44 for hot-water supply, and the amount of heat exchange is limited to heat dissipation with the air conditioner. The amount of heat is equivalent to the difference between the heat supply and heat absorption of hot water, so the overall efficiency of the system is improved.

Furthermore, in the air-conditioning and hot water supply system according to the present embodiment, since there are "cooling/hot water supply individual operation mode", "heating/hot water supply individual operation mode", "scheduling operation mode", "forced heating Mode", "Instant Boiling Operation Mode", "Quick Cooling Operation Mode", "Non-exhaust Hot Air Operation Mode" and "Energy Saving Operation Mode", so it can respond to various operation requirements and improve convenience.

Next, the air-conditioning and hot-water supply system according to the second embodiment of the present invention will be described. However, parts having the same configuration as those of the air-conditioning and hot-water supply system according to the first embodiment described above are denoted by the same reference numerals and omitted. illustrate. As shown in FIG. 20 , the air-conditioning hot water supply system according to the second embodiment of the present invention is characterized in that the intermediate heat exchanger 23 and the heat source side heat exchanger 44 for hot water supply are connected in series, and the intermediate heat exchanger 23 is connected in series to the heat source side heat exchanger 24 for air conditioning.

More specifically, in the refrigerant piping between the four-way valve 22 of the air-conditioning refrigerant circuit 5 and the expansion valve 27 for air-conditioning, a two-way valve 35a, an intermediate heat exchanger, and a two-way valve 35a are installed in series in order from the four-way valve 22 side. The exchanger 23, the two-way valve 35b, the first expansion valve 35c, the heat source side heat exchanger 24 for air conditioning, the second expansion valve 35d, and the refrigerant container 26 for air conditioning. Furthermore, an air-conditioning bypass pipe 101 for bypassing the intermediate heat exchanger 23 is connected to the air-conditioning refrigerant circuit 5 , and an air-conditioning bypass valve 35 e is attached to the air-conditioning bypass pipe 101 .

Similarly, in the refrigerant piping between the hot water supply compressor 41 and the hot water supply expansion valve 43 of the hot water supply refrigerant circuit 6, two are installed in series in order from the hot water supply compressor 41 side. The one-way valve 49d, the intermediate heat exchanger 23, the two-way valve 49b, the fourth expansion valve 49c, the heat source side heat exchanger 44 for hot water supply, and the third expansion valve 49a. Further, a hot water supply bypass pipe 201 for bypassing the intermediate heat exchanger 23 is connected to the hot water supply refrigerant circuit 6 , and a hot water supply bypass pipe 201 is attached to the hot water supply bypass pipe 201 . Valve 49e.

According to the air-conditioning and hot water supply system according to the second embodiment, if the opening and closing of the two-way valves 35a, 35b, 49b, 49d, expansion valves 35c, 35d, 49a, 49c, and bypass valves 35e, 49e are appropriately controlled , the same operation as that of the air-conditioning and hot-water supply system according to the first embodiment can also be performed.

Next, the air-conditioning and hot-water supply system according to the third embodiment of the present invention will be described. However, parts having the same configuration as those of the air-conditioning and hot-water supply system according to the first embodiment described above are denoted by the same reference numerals and omitted. illustrate. As shown in FIG. 21 , the air-conditioning and hot-water supply system according to the third embodiment of the present invention is characterized in that both the air-conditioning heat source side heat exchanger 324 and the hot water supply heat source side heat exchanger 444 have a plurality of passages.

More specifically, the air-conditioning heat source side heat exchanger 324 provided in the air-conditioning refrigerant circuit 5 is formed with flow passages of two passages, and is configured such that one passage can be closed as necessary so that only the air-conditioning refrigerant flows. through another path. Furthermore, in order to return the air-conditioning refrigerant remaining in the closed passage to the suction side of the air-conditioning compressor 21, the air-conditioning heat source side heat exchanger 324 and the suction side of the air-conditioning compressor 21 are refluxed with the air-conditioning refrigerant. The piping 301 is connected. In addition, the air-conditioning refrigerant return pipe 301 is provided with an air-conditioning partition valve 301a, and when the air-conditioning partition valve 301a is opened, the air-conditioning refrigerant remaining in the air-conditioning heat source side heat exchanger 324 flows through the air-conditioning system. The refrigerant returns to the suction side of the air-conditioning compressor 21 through the refrigerant return pipe 301 .

The heat source side heat exchanger 444 for hot water supply provided in the refrigerant circuit 6 for hot water supply is similarly formed with flow paths of two passages, and is configured so that one passage can be closed as necessary so that the refrigerant for hot water supply can only through another channel. Furthermore, in order to return the refrigerant for hot water supply remaining in the closed passage to the suction side of the compressor 41 for hot water supply, the heat source side heat exchanger 444 for hot water supply and the compressor 41 for hot water supply are connected to each other. The suction side is connected to the hot water supply refrigerant return pipe 401 . In addition, the hot water supply refrigerant return pipe 401 is provided with a hot water supply partition valve 401a, and when the hot water supply partition valve 401a is opened, the heat remaining in the hot water supply heat source side heat exchanger 444 The water supply refrigerant flows through the hot water supply refrigerant return pipe 401 and returns to the suction side of the hot water supply compressor 41 .

According to the air-conditioning and hot-water supply system according to the third embodiment, in addition to the operation of the air-conditioning and hot-water supply system according to the first embodiment, the number of channels of the air-conditioning heat source side heat exchanger 324 is switched by the control device 1a, The heat exchange amount of the air-conditioning heat source side heat exchanger 324 can be adjusted. Furthermore, in the heat source side heat exchanger 444 for hot water supply, the heat exchange amount of the heat source side heat exchanger 444 for hot water supply can also be adjusted by switching the number of passages by the control device 1a. In addition, the number of passages of the heat exchanger may be appropriately selected according to the specifications of the air-conditioning and hot-water supply system.

Explanation of reference signs

1a: Control device; 5: Refrigerant circuit for air conditioner; 5a: Refrigerant main circuit for air conditioner; 6: Refrigerant circuit for hot water supply; 6a: Refrigerant main circuit for hot water supply; 9: Hot water supply flow path ;21: Compressor for air conditioner; 22: Four-way valve (flow switching valve for air conditioner); 24, 324: Heat source side heat exchanger for air conditioner; 25: Outdoor fan for air conditioner; 27: Expansion valve for air conditioner; 28: Utilization side heat exchanger for air conditioner; 35c: first expansion valve (refrigerant flow control valve for first air conditioner); 35d: second expansion valve (refrigerant flow control valve for second air conditioner); 41: for hot water supply compressor; 42: heat exchanger on the utilization side for hot water supply; 43: expansion valve for hot water supply; 44, 444: heat source side heat exchanger for hot water supply; 45: outdoor fan for hot water supply; Triple expansion valve (refrigerant flow control valve for first hot water supply); 49c: fourth expansion valve (refrigerant flow control valve for second hot water supply); 70: hot water storage tank; 71a: drain piping; 71b : Drain valve; 78: Water supply port; 79: Hot water supply port; 301: Refrigerant return pipe for air conditioner; 301a: Isolation valve for air conditioner; 401: Refrigerant return pipe for hot water supply; 401a: Isolation for hot water supply valve.

Claims (6)

1. An air conditioner hot water supply system, the air conditioner hot water supply system has a refrigerant circuit for air conditioning, a refrigerant circuit for hot water supply, an intermediate heat exchanger, and a control device, and the intermediate heat exchanger circulates in the Heat exchange is performed between the air-conditioning refrigerant in the air-conditioning refrigerant circuit and the hot-water supply refrigerant circulating in the hot-water supply refrigerant circuit, the control device controls the operation, and the air-conditioning hot water The supply system is characterized by, The air-conditioning refrigerant circuit is configured by sequentially connecting an air-conditioning compressor, an air-conditioning flow switching valve, the intermediate heat exchanger, an air-conditioning expansion valve, and an air-conditioning use-side heat exchanger through refrigerant piping. In the annular circuit, the air-conditioning heat source side heat exchanger unit and the intermediate heat exchanger are connected in series or in parallel between the air-conditioning flow path switching valve and the air-conditioning expansion valve, so that The air-conditioning heat-source-side heat exchanger unit includes: an air-conditioning heat-source-side heat exchanger for exchanging heat between air-conditioning refrigerant and the air-conditioning heat-source-side heat exchanger; Outdoor fans for air conditioners; The refrigerant circuit for hot water supply is configured as a hot water supply use-side heat exchanger for sequentially exchanging heat between a hot water supply compressor and a heat transfer medium on a hot water supply use side through a refrigerant pipe. , the expansion valve for hot water supply, and the intermediate heat exchanger are connected to form an annular circuit, and the heat source for hot water supply is supplied between the compressor for hot water supply and the expansion valve for hot water supply A side heat exchanger unit is connected in series or in parallel to the intermediate heat exchanger, and the heat source side heat exchanger unit for hot water supply includes: The heat source side heat exchanger for hot water supply, and the outdoor fan for hot water supply that blows air to the heat source side heat exchanger for hot water supply; The air-conditioning heat source side heat exchanger unit includes a first air-conditioning refrigerant flow control valve and a second air-conditioning refrigerant flow control valve, the first air-conditioning refrigerant flow control valve and the second air-conditioning refrigerant flow control valve valves are respectively provided at the inlets and outlets of the air-conditioning heat source side heat exchangers to control the flow of the air-conditioning refrigerant, The heat source side heat exchanger unit for hot water supply includes a first refrigerant flow control valve for hot water supply and a second refrigerant flow control valve for hot water supply, and the first refrigerant flow control valve for hot water supply and The second refrigerant flow control valves for hot water supply are respectively provided at the inlets and outlets of the heat source side heat exchangers for hot water supply to control the flow rate of the refrigerant for hot water supply, The control device calculates the amount of radiation required by the air-conditioning refrigerant circuit in cooling operation and the amount of heat absorbed by the refrigerant circuit for hot water supply in hot water supply operation, and, at the In the case of the first load state in which the heat radiation amount is larger than the heat absorption amount, the rotation speed of the air-conditioning outdoor fan of the air-conditioning heat source side heat exchanger unit is controlled so as to exchange heat from the air-conditioning heat source side. The heat sink unit dissipates to the atmosphere a difference in heat equivalent to the difference between the heat dissipation and the heat absorption; in the case of a second load state where the heat absorption is greater than the heat dissipation, the heat is controlled The rotation speed of the outdoor fan for hot water supply of the heat source side heat exchanger unit for water supply so that the differential heat is absorbed from the atmosphere by the heat source side heat exchanger unit for hot water supply; In the case of a third load state within a range in which the heat absorption amount can be regarded as being equal, control is performed to stop relying on the heat source side heat exchanger unit for air conditioning and the heat source side heat exchanger unit for hot water supply. The unit performs heat exchange with the atmosphere by performing heat exchange between the air-conditioning refrigerant circuit and the hot water supply refrigerant circuit via the intermediate heat exchanger. 2. The air-conditioning and hot water supply system according to claim 1, characterized in that: The control device controls the outdoor fan for air conditioning after controlling the valve opening degree of the expansion valve for hot water supply to satisfy a predetermined condition required for the hot water supply operation in the first load state. The rotational speed of the air-conditioning outdoor fan and the valve opening degree of the expansion valve for the air-conditioning are satisfied in order to satisfy the predetermined conditions required for the cooling operation, and when the rotational speed of the outdoor fan for the air-conditioning and the heat-source-side heat exchanger unit for the air-conditioning are controlled When the difference between the heat exchange amount and the difference heat is also out of a predetermined range, control is performed to adjust the flow rate of the first air-conditioning refrigerant flow control valve and the second air-conditioning refrigerant flow control valve. at least one side of the valve opening in order to compensate for the difference; The control device controls the rotation speed of the hot water supply outdoor fan after controlling the valve opening of the air-conditioning expansion valve to satisfy the predetermined condition required for the cooling operation in the second load state. and the valve opening of the hot water supply expansion valve so as to meet the predetermined conditions required for the hot water supply operation, and when even controlling the rotation speed of the hot water supply outdoor fan, the hot water supply When the difference between the heat exchange amount of the heat source side heat exchanger unit and the differential heat is also out of a predetermined range, control is performed to adjust the first refrigerant flow rate control valve for hot water supply and the second refrigerant flow rate control valve. The valve opening of at least one of the two refrigerant flow rate valves for hot water supply is controlled so as to compensate for the difference. 3. The air-conditioning and hot water supply system according to claim 2, wherein the control device calculates the target condensation rate of the cooling operation based on the calculated heat dissipation, heat absorption and outside air temperature. temperature and the target evaporation temperature of the hot water supply operation, the target condensation temperature is set as the predetermined condition required for the cooling operation, and the target evaporation temperature is set as the hot water supply operation The predetermined conditions required. 4. The air-conditioning hot water supply system according to claim 1 or 2, wherein the control device has a forced heating operation mode, and in the forced heating operation mode, in the air-conditioning refrigerant circuit, A heating operation is performed in which the heat source side heat exchanger for air conditioning and the intermediate heat exchanger are used as evaporators, and the heat source side heat exchanger for hot water supply is heated in the refrigerant circuit for hot water supply. The exchanger operates as a hot water supply for the evaporator, In the forced heating operation mode, the control device controls to open the first air-conditioning refrigerant flow control valve and the second air-conditioning refrigerant flow control valve so that the air-conditioning refrigerant flows to the air conditioner. Both the heat source side heat exchanger and the intermediate heat exchanger flow, and the first refrigerant flow control valve for hot water supply and the second refrigerant flow control valve for hot water supply are opened, so that the hot water supply The refrigerant flows into the hot water supply heat source side heat exchanger and does not flow into the intermediate heat exchanger. 5. The air-conditioning and hot-water supply system according to claim 1 or 2, wherein the air-conditioning and hot-water supply system includes a hot-water supply flow path, and the hot-water supply flow path is configured such that the The inlet of the use-side heat exchanger for hot water supply is connected to the water supply port of the heat transfer medium on the use side for hot water supply, and the outlet of the use-side heat exchanger for hot water supply is connected to the heat transfer medium by piping. The hot water supply port of the heat transfer medium on the usage side for water supply is connected to form a flow path for the heat transfer medium on the usage side of the hot water supply to flow, and the usage side of the hot water supply in the flow path A hot water storage container is provided between the heat exchanger and the hot water supply port, and the hot water storage container is used to store the heat transfer medium on the utilization side of the hot water supply, The control device includes an instantaneous boiling operation mode in which cooling operation using the intermediate heat exchanger as a condenser is performed in the air-conditioning refrigerant circuit, and the hot water In the supply refrigerant circuit, a hot water supply operation using the hot water supply heat source side heat exchanger and the intermediate heat exchanger as an evaporator is performed, In the instant boiling operation mode, the control device closes the first air-conditioning refrigerant flow control valve and the second air-conditioning refrigerant flow control valve, and supplies the hot water supply compressor The rotation speed is controlled to a predetermined rotation speed, and the outdoor fan for hot water supply is controlled so as to absorb from the atmosphere an amount corresponding to the difference between the heat dissipation amount of the refrigerant circuit for air conditioning and the heat absorption amount of the refrigerant circuit for hot water supply. differential heat. 6. The air-conditioning hot water supply system according to claim 1 or 2, wherein the control device has a rapid cooling operation mode, and in the rapid cooling operation mode, in the air-conditioning refrigerant circuit, performing a cooling operation using the heat source side heat exchanger for air conditioning and the intermediate heat exchanger as a condenser, and performing a cooling operation in which the intermediate heat exchanger is used as an evaporator in the hot water supply refrigerant circuit hot water supply operation, In the rapid cooling operation mode, the control device closes the first hot water supply refrigerant flow control valve and the second hot water supply refrigerant flow control valve, and turns the air conditioner compressor The rotation speed of the air conditioner is controlled to a predetermined rotation speed, and the outdoor fan for air conditioning is controlled so that the difference between the heat dissipation amount of the air conditioning refrigerant circuit and the heat absorption amount of the hot water supply refrigerant circuit is released to the atmosphere.