CN103348200B - Air conditioning and hot-water supplying system - Google Patents

Abstract

The present invention provides an air-conditioning and hot-water supply system capable of improving the overall efficiency of the air-conditioning and hot-water supply system. The air-conditioning refrigerant circuit (10) includes an air-conditioning compressor (11), an air-conditioning operation switching unit (12), an air-conditioning heat source side heat exchanger (13), pressure reducing devices (14, 16), air Regulating the heat exchanger (15) on the use side and the intermediate heat exchanger (21) for heat exchange between the first refrigerant and the second refrigerant form a heat exchange between the air conditioning compressor (11) and the air conditioning heat source side. The first branch part (22) that branches between the devices (13) to adjust the flow rate of the first refrigerant flowing in the branch direction, between the air conditioning compressor (11) and the air conditioning use side heat exchanger (15) The second branch part (32) is branched to adjust the flow rate of the first refrigerant flowing in the branch direction. One end of the intermediate heat exchanger (21) is connected to the first branch part (22) and the second branch part (32), and the other end The air conditioning heat source side heat exchanger (13) and the air conditioning use side heat exchanger (15) are connected at a junction (24), and function as a condenser for the first refrigerant.

Description

Air Conditioning Hot Water Supply System

technical field

The invention relates to an air conditioning and hot water supply system for air conditioning and hot water supply.

Background technique

As an air-conditioning and hot-water supply system that performs air conditioning and hot-water supply, for example, the technology shown in Patent Document 1 is disclosed.

Patent Document 1 discloses an air conditioning device (air conditioning hot water supply system), which is characterized in that the first compressor, the first four-way valve, the outdoor heat exchanger, the first electromagnetic expansion valve, and the indoor heat The exchangers are connected as the main cycle, and the second compressor, the second four-way valve, the third four-way valve, the heat exchanger for hot water supply, the auxiliary heat exchanger, the second electromagnetic expansion valve and the third electromagnetic expansion valve Connected as a secondary cycle, these main cycles and secondary cycles are heat exchangeably connected through cascaded condensers to form a refrigerant circuit.

prior art literature

patent documents

Patent Document 1: JP-A-2005-299935

Contents of the invention

The problem to be solved by the invention

In the air conditioner (air conditioning and hot water supply system) described in Patent Document 1, the primary side (main circulation side) of the cascade condenser functions as a condenser during cooling and hot water supply operation, and the secondary side (The side of the sub-circulation) functions as an evaporator, whereby the exhaust heat of the main cycle can be utilized in the sub-circulation (see FIGS. 5 and 8 of Patent Document 1).

However, the air-conditioning apparatus (air-conditioning and hot water supply system) described in Patent Document 1 cannot use the primary side of the cascade condenser (intermediate heat exchanger) as a condenser during the heating operation of the main cycle (air-conditioning cycle). to play a role.

Therefore, during heating and hot water supply operation, as shown in FIG. 9 of Patent Document 1, the refrigerant is not circulated through the cascade condenser (intermediate heat exchanger), and the main cycle (air conditioning cycle) and the sub cycle ( hot water supply cycle) function independently.

Therefore, an object of the present invention is to provide an air-conditioning and hot-water supply system capable of improving the efficiency of the entire air-conditioning and hot-water supply system.

means to solve the problem

In order to solve such a problem, the invention of claim 1 is an air conditioning hot water supply system including a refrigerant circuit for air conditioning of a first refrigerant cycle and a refrigerant circuit for hot water supply of a second refrigerant cycle. The air-conditioning refrigerant circuit is characterized in that: an air-conditioning compressor that compresses the first refrigerant; and an air-conditioning operation switching unit that switches the flow of the first refrigerant between cooling operation and heating operation. direction; air conditioning heat source side heat exchanger, which functions as a condenser during cooling operation, and functions as an evaporator during heating operation; decompression device, which decompresses the first refrigerant; air conditioning use side A heat exchanger that functions as an evaporator during cooling operation and a condenser during heating operation; an intermediate heat exchanger that performs heat exchange between the first refrigerant and the second refrigerant is formed in The air-conditioning compressor and the air-conditioning heat source side heat exchanger are branched to adjust the flow rate of the first refrigerant flowing in the branching direction. A second branch portion is branched between the exchangers to adjust the flow rate of the first refrigerant flowing in the branching direction. The intermediate heat exchanger has one end connected to the first branch portion and the second branch portion, and the other end on the air conditioning heat source side. The heat exchanger is connected to the junction between the air-conditioning use-side heat exchanger, and functions as a condenser during cooling operation and heating operation.

Invention effect

According to the present invention, it is possible to provide an air-conditioning and hot-water supply system capable of improving the efficiency of the entire air-conditioning and hot-water supply system.

Description of drawings

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

FIG. 2 is a flowchart showing the procedure of the determination process of the operation mode of the air-conditioning and hot-water supply system according to the present embodiment.

FIG. 3 is a flowchart showing a procedure for determining an operation mode of the air-conditioning and hot-water supply system according to the present embodiment.

4 is a flowchart showing the procedure of estimation processing of air-conditioning exhaust heat and hot water supply heat absorption.

FIG. 5 is a flowchart showing the procedure of estimation processing of individual total power consumption and waste heat operation power consumption.

Fig. 6 is a system diagram showing flows of refrigerant and heated liquid in the heat pump unit in a hot water supply operation mode.

Fig. 7 is a system diagram showing the flow of refrigerant and heat transfer medium in the heat pump unit in cooling operation mode.

Fig. 8 is a system diagram showing the flow of refrigerant and heat transfer medium in the heat pump unit in the heating operation mode.

9 is a system diagram showing the flows of the refrigerant, the heat transfer medium, and the liquid to be heated in the heat pump unit in the cooling and hot water supply operation (exhaust heat recovery A) mode.

10 is a system diagram showing the flows of the refrigerant, the heat transfer medium, and the liquid to be heated in the heat pump unit in the cooling and hot water supply operation (exhaust heat recovery B) mode.

11 is a system diagram showing the flows of the refrigerant, the heat transfer medium, and the liquid to be heated in the heat pump unit in the cooling and hot water supply operation (exhaust heat recovery C) mode.

12 is a system diagram showing the flows of refrigerant, heat transfer medium, and heated liquid in the heat pump unit in the heating and hot water supply operation (independent) mode.

13 is a system diagram showing the flows of refrigerant, heat transfer medium, and heated liquid in the heat pump unit in the heating and hot water supply operation (air conditioning residual heating) mode.

FIG. 14 is a graph showing fluctuations in heating load on days before and after the coldest day in Tokyo.

Detailed ways

Hereinafter, modes for implementing the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the drawings as appropriate. In addition, the same code|symbol is attached|subjected to the common part in each figure, and overlapping description is abbreviate|omitted.

<<Air conditioning hot water supply system>>

FIG. 1 is a system diagram showing an air conditioning and hot water supply system S according to this embodiment.

The air-conditioned hot water supply system S includes a heat pump unit 1 installed outdoors (outside the air-conditioned space), an indoor unit 2 installed indoors (air-conditioned space), a hot water supply tank unit 3 , and a control device 4 .

The air-conditioning hot water supply system S has the function of performing the following operations: "cooling operation", which cools the room where the indoor unit 2 is arranged; "heating operation", which heats the room where the indoor unit 2 is arranged; "Hot water supply operation", which heats the liquid to be heated to store the high temperature liquid to be heated in the hot water supply tank unit 3 (tank 62 described later); Cooling operation and hot water supply operation; "heating and hot water supply operation" which performs heating operation and hot water supply operation.

The air conditioning hot water supply system S includes an air conditioning refrigerant circuit 10 for the first refrigerant cycle, a hot water supply refrigerant circuit 40 for the second refrigerant cycle, and an air conditioning heat transfer medium circulation circuit for the heat transfer medium circulation. 50. The hot water supply circuit 60 through which the liquid to be heated circulates.

<Air Conditioning Refrigerant Circuit>

An air-conditioning compressor 11 that compresses the first refrigerant to become a high-pressure refrigerant, and an air-conditioning four-way valve 12 that switches the flow direction of the first refrigerant during cooling operation and heating operation are connected through piping. Air-conditioning heat source side heat exchanger 13 for exchanging heat with air (outdoor air) sent by air-conditioning fan 13a, air-conditioning main expansion valve as first decompression device for decompressing the first refrigerant 14. The air-conditioning user-side heat exchanger 15 that performs heat exchange with the heat transfer medium is connected in a ring shape to form the air-conditioning refrigerant circuit 10 provided in the heat pump unit 1 .

In addition, as the first refrigerant, HFC, HFO-1234yf, HFO-1234ze, natural refrigerants such as CO ₂ refrigerants, etc. can be used.

In addition, the air-conditioning refrigerant circuit 10 connects the air-conditioning auxiliary expansion valve 16 as the second depressurizing device for decompressing the first refrigerant to the air-conditioning heat source side heat exchanger 13 and the air-conditioning main expansion valve. Valve 14 is connected to the circuit.

In addition, in the air conditioning refrigerant circuit 10 , the primary side heat transfer pipe 21 a of the intermediate heat exchanger 21 that performs heat exchange with the second refrigerant is connected in parallel to the air conditioning heat source side heat exchanger 13 . One end of the primary side heat transfer pipe 21a of the intermediate heat exchanger 21 is connected to the first air conditioning control three-way valve 22 connected to the circuit connecting the air conditioning four-way valve 12 and the air conditioning heat source side heat exchanger 13 . The other end of the primary side heat transfer pipe 21 a of the intermediate heat exchanger 21 is connected to a circuit connecting the auxiliary expansion valve 16 for air conditioning and the main expansion valve 14 for air conditioning via the first air conditioning control valve 23 . In addition, in the following description, the pipes extending from the auxiliary expansion valve 16 for air conditioning, the pipes extending from the main expansion valve 14 for air conditioning, and the pipes extending from the other end of the primary side heat transfer pipe 21 a of the intermediate heat exchanger 21 The part where the pipes are connected is called the confluence part 24.

The first air-conditioning control three-way valve 22 is a three-way valve configured to be able to adjust the flow ratio of the first refrigerant that flows. The first air-conditioning control valve 23 is an on-off valve configured to be controllable in opening and closing.

In addition, the air-conditioning refrigerant circuit 10 is connected to a bypass circuit 31 through which the first refrigerant can flow. One end of the bypass circuit 31 is connected to a second air-conditioning control three-way valve 32 connected to a circuit connecting the secondary-side heat transfer pipe 15 b of the air-conditioning use-side heat exchanger 15 and the air-conditioning four-way valve 12 . The other end of the bypass circuit 31 is connected to a circuit connecting the first air conditioning control three-way valve 22 and the primary side heat transfer pipe 21 a of the intermediate heat exchanger 21 via the second air conditioning control valve 33 .

The second air-conditioning control three-way valve 32 is a three-way valve configured to be able to adjust the flow ratio of the first refrigerant that flows. The second air-conditioning control valve 33 is an on-off valve configured to be controllable in opening and closing.

<Refrigerant circuit for hot water supply>

The hot water supply compressor 41 that compresses the second refrigerant to become a high-pressure refrigerant, the hot water that exchanges heat with the liquid to be heated is supplied to the primary side heat transfer pipe 42a of the use side heat exchanger 42, The main expansion valve 43 for hot water supply as a decompression device for decompressing the second refrigerant, and the hot water supply heat source side for heat exchange with the air (outdoor air) sent by the fan 44a for hot water supply. The exchangers 44 are connected in a ring shape to constitute the hot water supply refrigerant circuit 40 provided in the heat pump unit 1 .

In addition, as the second refrigerant, HFC, HFO-1234yf, HFO-1234ze, natural refrigerants such as CO ₂ refrigerants, etc. can be used.

Further, in the hot water supply refrigerant circuit 40 , the secondary side heat transfer pipe 21 b of the intermediate heat exchanger 21 that performs heat exchange with the first refrigerant is connected in parallel to the hot water supply heat source side heat exchanger 44 . One end of the secondary side heat transfer pipe 21b of the intermediate heat exchanger 21 is connected to the first hot water supply control tee connected to the circuit connecting the hot water supply main expansion valve 43 and the hot water supply heat source side heat exchanger 44 Valve 45 is connected. The other end of the secondary side heat transfer pipe 21b of the intermediate heat exchanger 21 is connected to the second hot water supply control tee connected to the circuit connecting the hot water supply heat source side heat exchanger 44 and the hot water supply compressor 41 Valve 46 is connected.

The first hot water supply control three-way valve 45 and the second hot water supply control three-way valve 46 are three-way valves configured to be able to adjust the flow ratio of the second refrigerant flowing therethrough.

<Heat transfer medium circulation circuit for air conditioning>

The first pump 51 for transporting the heat transfer medium, the heat transfer medium four-way valve 52 for switching the flow direction of the heat transfer medium during the cooling operation and the heating operation, and the air conditioner for exchanging heat with the first refrigerant are connected by piping. The primary side heat transfer pipe 15a of the side heat exchanger 15 and the indoor heat exchanger 53 for exchanging heat with the air (indoor air) sent by the indoor fan 53a are connected in a ring shape to constitute the arrangement from the heat pump unit 1 to the indoor unit 2. The heat transfer medium circulation loop 50 for air conditioning.

In addition, water, salt water (antifreeze) such as ethylene glycol, or the like can be used as the heat transfer medium.

<Hot water supply circuit>

The second pump 61 for transporting the liquid to be heated, the secondary side heat transfer pipe 42b of the use side heat exchanger 42 for the hot water that exchanges heat with the second refrigerant are supplied to the hot water supply tank unit 3 through piping, and The tank 62 storing the liquid to be heated is connected in a ring shape to form a hot water supply circuit 60 provided from the heat pump unit 1 to the hot water supply tank unit 3 .

In addition, in the following description, water will be used as the liquid to be heated.

In addition, the hot water supply tank unit 3 includes: a water supply joint 63 connected to the lower part of the tank 62 and connected to an external water supply source (such as tap water); Hot water supply joint 64.

When a user opens a water supply terminal (not shown), the liquid to be heated (water) flows into the lower part of the tank 62 from the water supply source through the water supply joint 63 . Furthermore, the high-temperature liquid to be heated (hot water) stored in the upper part of the tank 62 is supplied to a water supply terminal (not shown) via the hot water supply joint 64 .

<control device>

In addition, the air conditioning and hot water supply system S includes a control device 4 .

The control device 4 has the following functions, that is, to determine the operation mode of the air-conditioning hot water supply system S, and to control various valves (the first air-conditioning control valve 23, the second air-conditioning control valve 33, the first air-conditioning control valve) according to the determined operation mode. Control three-way valve 22, second air conditioning control three-way valve 32, first hot water supply control three-way valve 45, second hot water supply control three-way valve 46, air conditioning four-way valve 12, heat transfer medium four The state (opening degree) of the through valve 52, the main expansion valve 14 for air conditioning, the auxiliary expansion valve 16 for air conditioning, and the main expansion valve 43 for hot water supply), and the rotational speed of the pumps (the first pump 51 and the second pump 61) , the rotation speed of the compressor (the compressor for air conditioning 11, the compressor for hot water supply 41), the rotation speed of the fans of each heat exchanger (the fan for air conditioning 13a, the fan for hot water supply 44a, and the indoor fan 53a), control Various operations of the air conditioning hot water supply system S.

(Determination process of operation mode)

The operation modes of the air conditioning and hot water supply system S performed by the control device 4 will be described. FIG. 2 and FIG. 3 are flowcharts showing the procedure of the determination process of the operation mode of the air-conditioning and hot water supply system S according to this embodiment.

First, it will be described with reference to FIG. 2 .

In step S101, the control device 4 determines whether or not there is an air-conditioning cycle operation request. Here, the air-conditioning cycle operation request refers to an operation request for air conditioning (cooling/heating) in the room (space to be air-conditioned) in which the indoor unit 2 is installed. The air-conditioning cycle operation request can be input to the control device 4 by, for example, a user operating a remote controller (not shown) installed indoors, or based on the detected temperature of an indoor temperature detector (not shown) that detects the indoor temperature. (indoor temperature) and indoor set temperature to determine.

When there is an air-conditioning cycle operation request (S101/YES), the processing of the control device 4 proceeds to step S105. When there is no air-conditioning cycle operation request (S101/NO), the processing of the control device 4 proceeds to step S102.

In step S102, control device 4 determines whether or not there is a hot water supply circulation operation request. Here, the hot water supply circulation operation request refers to a request to execute the hot water supply operation of the air-conditioning hot water supply system S. The hot water supply cycle operation request can be input to the control device 4 by, for example, a user operating a remote controller (not shown) installed indoors, or can be inputted by the high temperature stored in the tank 62 of the hot water supply tank unit 3 . When the amount of heating liquid is equal to or less than a predetermined amount, it is set as a "hot water supply circulation operation request", and when it falls within a predetermined period of time, it may be set as a "hot water supply circulation operation request".

When there is a hot water supply circulation operation request (S102/YES), the processing of the control device 4 proceeds to step S104. When there is no hot water supply circulation operation request (S102/No), the processing of the control device 4 proceeds to step S103.

In step S103, the control device 4 determines the operation mode of the air conditioning and hot water supply system S to be "standby mode". In addition, the standby mode refers to a mode in which the air conditioning operation (cooling operation/heating operation) and the hot water supply operation of the air conditioning and hot water supply system S are stopped to wait for an input of an operation command.

In step S104, the control device 4 determines the operation mode of the air-conditioning and hot water supply system S as the "hot water supply operation mode". In addition, the hot water supply operation mode refers to a mode in which the hot water supply operation of the air-conditioning hot water supply system S is performed. The operation of the air conditioning and hot water supply system S (heat pump unit 1 ) in this operation mode will be described later using FIG. 6 .

In step S105, the control device 4 determines whether or not there is a hot water supply circulation operation request. In addition, the hot water supply circulation operation request in step S105 is the same as the hot water supply circulation operation request in step S102, and description thereof will be omitted.

When there is a hot water supply circulation operation request (S105/YES), the process of the control device 4 proceeds to step S109. When there is no hot water supply circulation operation request (S105/No), the processing of the control device 4 proceeds to step S106.

In step S106, control device 4 determines whether or not the hot water supply cycle operation request is "cooling operation".

When the hot water supply cycle operation request is "cooling operation" (S106/YES), the process of the control device 4 proceeds to step S107. When the hot water supply cycle operation request is not "cooling operation" (S106/No), the process of the control device 4 proceeds to step S108.

In step S107, the control device 4 determines the operation mode of the air conditioning and hot water supply system S as "cooling operation mode". In addition, the cooling operation mode refers to a mode in which the cooling operation of the air conditioning and hot water supply system S is performed. The operation of the air conditioning and hot water supply system S (heat pump unit 1 ) in this operation mode will be described later using FIG. 7 .

In step S108, the control device 4 determines the operation mode of the air conditioning and hot water supply system S as "heating operation mode". In addition, the heating operation mode is a mode in which the heating operation of the air-conditioning and hot water supply system S is performed. The operation of the air conditioning and hot water supply system S (heat pump unit 1 ) in this operation mode will be described later using FIG. 8 .

In step S109, control device 4 determines whether or not the hot water supply cycle operation request is "cooling operation".

When the hot water supply cycle operation request is "cooling operation" (S109/YES), the process of the control device 4 proceeds to step S110. When the hot water supply cycle operation request is not "cooling operation" (S109/No), the processing of the control device 4 proceeds to step S201 in FIG. 3 .

In step S110, the control device 4 estimates the air-conditioning exhaust heat Qac_ex and the hot water supply heat absorption Qec_ex. Here, the air-conditioning heat dissipation amount Qac_ex is the heat dissipation amount to a heat source required for cooling operation when the air-conditioning refrigerant circuit 10 and the hot-water supply refrigerant circuit 40 are operated independently. The hot water supply heat absorption Qec_ex is the heat supply from a heat source required for the hot water supply operation when the air conditioning refrigerant circuit 10 and the hot water supply refrigerant circuit 40 are independently operated.

In addition, the estimation process of the air-conditioning exhaust heat amount Qac_ex and the hot water supply heat absorption amount Qec_ex will be described later using FIG. 4 .

In step S111, the control device 4 determines whether or not the air-conditioning exhaust heat Qac_ex is greater than the hot water supply heat absorption Qec_ex.

When the air-conditioning exhaust heat Qac_ex is larger than the hot water supply heat absorption Qec_ex (S111/YES), the process of the control device 4 proceeds to step S112. When the air-conditioning exhaust heat Qac_ex is not larger than the hot water supply heat absorption Qec_ex (S111/No), the process of the control device 4 proceeds to step S113.

In step S112 , the control device 4 determines the operation mode of the air-conditioning and hot water supply system S to be "cooling and hot water supply operation (exhaust heat recovery A) mode". In addition, the cooling and hot water supply operation (exhaust heat recovery A) mode is one of the modes in which the cooling operation and the hot water supply operation of the air-conditioning and hot water supply system S are performed, and air is recovered by the refrigerant circuit 40 for hot water supply. Conditioning operates with the heat rejection of the refrigerant circuit 10 . The operation of the air conditioning and hot water supply system S (heat pump unit 1 ) in this operation mode will be described later using FIG. 9 .

In step S113, the control device 4 determines whether or not the air-conditioning exhaust heat Qac_ex is equal to the hot water supply heat absorption Qec_ex.

When the air-conditioning exhaust heat Qac_ex is equal to the hot water supply heat absorption Qec_ex (S113/YES), the process of the control device 4 proceeds to step S114. When the air-conditioning exhaust heat Qac_ex is not equal to the hot water supply heat absorption Qec_ex (S113/No), the process of the control device 4 proceeds to step S115.

In step S114 , the control device 4 determines the operation mode of the air-conditioning and hot water supply system S to be "cooling and hot water supply operation (exhaust heat recovery B) mode". In addition, the cooling and hot water supply operation (exhaust heat recovery B) mode is one of the modes in which the cooling operation and the hot water supply operation of the air-conditioning and hot water supply system S are performed, and air is recovered by the refrigerant circuit 40 for hot water supply. Conditioning operates with the heat rejection of the refrigerant circuit 10 . The operation of the air conditioning and hot water supply system S (heat pump unit 1 ) in this operation mode will be described later using FIG. 10 .

In step S115 , the control device 4 determines the operation mode of the air-conditioning and hot water supply system S to be "cooling and hot water supply operation (exhaust heat recovery C) mode". In addition, the cooling and hot water supply operation (exhaust heat recovery C) mode is one of the modes in which the cooling operation and the hot water supply operation of the air-conditioning and hot water supply system S are performed, and air is recovered by the refrigerant circuit 40 for hot water supply. Conditioning operates with the heat rejection of the refrigerant circuit 10 . The operation of the air conditioning and hot water supply system S (heat pump unit 1 ) in this operation mode will be described later using FIG. 11 .

Next, the case where the air-conditioning cycle operation request is not "cooling operation" in step S109 (S109/NO) will be described using FIG. 3 . That is, it will be described that there is a hot water supply cycle operation request (see S105/YES) and an air conditioning cycle operation request that is "heating operation".

In step S201 , the control device 4 estimates the individual total power consumption Wsys1 and the waste heat operation power consumption Wsys2 . Here, the total individual power consumption Wsys1 refers to estimated power consumption when the air-conditioning and hot water supply system S is operated in the heating and hot water supply operation (independent) mode (see FIG. 12 described later). The residual heat operation power consumption Wsys2 refers to estimated power consumption when the air-conditioning and hot water supply system S is operated in the heating and hot water supply operation (air conditioning residual heating) mode (see FIG. 13 described later).

In addition, the estimation processing of the individual total power consumption Wsys1 and the waste heat operation power consumption Wsys2 will be described later using FIG. 5 .

In step S202 , the control device 4 determines whether or not the total individual power consumption Wsys1 is equal to or less than the waste heat operation power consumption Wsys2 .

When the individual total power consumption Wsys1 is equal to or less than the waste heat operation power consumption Wsys2 ( S202 /YES), the process of the control device 4 proceeds to step S203 . When the individual total power consumption Wsys1 is not equal to or less than the waste heat operation power consumption Wsys2 ( S202 /No), the process of the control device 4 proceeds to step S204 .

In step S203 , the control device 4 determines the operation mode of the air-conditioning and hot water supply system S as "heating and hot water supply operation (independent) mode". In addition, the heating and hot water supply operation (independent) mode is one of the modes in which the heating operation and the hot water supply operation of the air conditioning and hot water supply system S are performed, and the hot water supply refrigerant circuit 40 and the air conditioning refrigerant circuit 10 operates independently without using the intermediate heat exchanger 21. The operation of the air conditioning and hot water supply system S (heat pump unit 1 ) in this operation mode will be described later using FIG. 12 .

In step S204 , the control device 4 determines the operation mode of the air-conditioning and hot-water supply system S as "heating and hot-water supply operation (air-conditioning residual heating) mode". In addition, in the heating and hot water supply operation (air conditioning residual heating) mode, the heating operation of the air conditioning and hot water supply system S is performed, and the waste heat of the air conditioning refrigerant circuit 10 is recovered by the hot water supply refrigerant circuit 40 to perform hot water heating. mode of supply operation. The operation of the air conditioning and hot water supply system S (heat pump unit 1 ) in this operation mode will be described later using FIG. 13 .

(Estimated processing of air conditioning exhaust heat Qac_ex and hot water supply heat absorption Qec_ex)

FIG. 4 is a flowchart showing the procedure of estimation processing of the air-conditioning exhaust heat amount Qac_ex and the hot water supply heat absorption amount Qec_ex in step S110 of FIG. 2 .

In step S301, the control device 4 estimates the air conditioning load Qac. In addition, the air conditioning load Qac is estimated from the outdoor temperature Tao, the indoor temperature Tai, the indoor set temperature Tac_set, and the indoor air volume Vac_set.

For example, the outdoor temperature Tao is detected by a temperature sensor (not shown) provided at the outside air inlet of the air-conditioning fan 13 a or the hot-water supply fan 44 a of the heat pump unit 1 . For example, the indoor temperature Tai is detected by a temperature sensor (not shown) provided at the indoor air inlet of the indoor fan 53a of the indoor unit 2 . The indoor air volume Vac_set is calculated by detecting the rotation speed of the indoor fan 53 a (flow rate of air), for example. Alternatively, it is calculated based on the set air volume set by the user through a remote controller (not shown) installed indoors. For example, the indoor set temperature Tac_set is input to the control device 4 by the user operating a remote controller (not shown) installed indoors.

In step S302, the control device 4 estimates the air-conditioning power consumption Wac. In addition, the air conditioning power consumption Wac is estimated from the air conditioning load Qac estimated in step S301, the outdoor temperature Tao, and the indoor set temperature Tac_set.

In step S303, the control device 4 estimates the air-conditioning exhaust heat amount Qac_ex. In addition, the air-conditioning exhaust heat amount Qac_ex is estimated from the air-conditioning load Qac estimated in step S301 and the air-conditioning power consumption Wac estimated in step S302.

In step S304, the control device 4 estimates the hot water supply load Qec. Also, the hot water supply load Qec is estimated from the outdoor temperature Tao, the supplied water temperature Twi, the hot water supply temperature Two, and the supplied water flow rate Vw.

For example, the supply water temperature Twi is detected by a temperature sensor (not shown) provided on the inlet side of the secondary side heat transfer pipe 42 b of the hot water supply use side heat exchanger 42 of the heat pump unit 1 . The hot water supply temperature Two is a set temperature of hot water (heated liquid) boiled by the heat pump unit 1, and is input to the control device 4 by, for example, a user operating a remote controller (not shown) installed indoors. For example, the supply water flow rate Vw is calculated by detecting the rotation speed of the second pump 61 of the heat pump unit 1 .

In step S305, the control device 4 estimates the hot water supply power consumption Wec. Furthermore, the hot water supply power consumption Wec is estimated based on the hot water supply load Qec, the outdoor temperature Tao, and the hot water supply temperature Two estimated in step S304.

In step S306, the control device 4 estimates the hot water supply heat absorption Qec_ex. In addition, the hot water supply endothermic amount Qec_ex is estimated based on the hot water supply load Qec estimated in step S304 and the hot water supply power consumption Wec estimated in step S305.

In this way, the control device 4 estimates the air-conditioning exhaust heat Qac_ex (see S303 ), estimates the hot water supply heat absorption Qec_ex (see S306 ), and the process of the control device 4 ends step S110 in FIG. 2 and proceeds to step S111 .

(Individual total power consumption Wsys1 and waste heat operation power consumption Wsys2 estimation processing)

FIG. 5 is a flowchart showing the procedure of estimation processing of the individual total power consumption Wsys1 and the waste heat operation power consumption Wsys2 in step S201 of FIG. 3 .

In step S401, the control device 4 estimates the air conditioning load Qac. In addition, the air conditioning load Qac is estimated from the outdoor temperature Tao, the indoor temperature Tai, the indoor set temperature Tac_set, and the indoor air volume Vac_set.

In step S402, the control device 4 estimates the air-conditioning compressor target rotation speed Ncp_ac. Furthermore, the air-conditioning compressor target rotational speed Ncp_ac is estimated from the air-conditioning load Qac, the outdoor temperature Tao, the indoor set temperature Tac_set, and the indoor air volume Vac_set estimated in step S401.

In step S403, the control apparatus 4 determines whether the air-conditioning compressor target rotation speed Ncp_ac estimated in step S402 is equal to or more than the air-conditioning compressor minimum rotation speed Ncp_acmin.

Here, the air conditioning compressor minimum rotational speed Ncp_acmin refers to the lower limit of the rotational speed at which the air conditioning compressor 11 of the air conditioning refrigerant circuit 10 can perform operational control.

When the air-conditioning compressor target rotation speed Ncp_ac is equal to or greater than the air-conditioning compressor minimum rotation speed Ncp_acmin ( S403 /YES), the process of the control device 4 proceeds to step S404 . When the air-conditioning compressor target rotation speed Ncp_ac is not equal to or greater than the air-conditioning compressor minimum rotation speed Ncp_acmin (S403/No), the process of the control device 4 proceeds to step S409.

In step S404, the control device 4 estimates the air-conditioning power consumption Wac. In addition, the air conditioning power consumption Wac is estimated from the air conditioning load Qac estimated in step S401, the outdoor temperature Tao, and the indoor set temperature Tac_set.

In step S405, the control device 4 estimates the hot water supply load Qec. Also, the hot water supply load Qec is estimated from the outdoor temperature Tao, the supplied water temperature Twi, the hot water supply temperature Two, and the supplied water flow rate Vw.

In step S406, the control device 4 estimates the hot water supply power consumption Wec. Also, the hot water supply power consumption Wec is estimated based on the hot water supply load Qec, the outdoor temperature Tao, and the hot water supply temperature Two estimated in step S405.

In step S407, the control device 4 estimates the total individual power consumption Wsys1. Also, the total individual power consumption Wsys1 is estimated by adding the air conditioning power consumption Wac estimated in step S404 and the hot water supply power consumption Wec estimated in step S406 (that is, Wsys1=Wac+Wec).

In step S408, the control device 4 estimates the waste heat operation power consumption Wsys2. In addition, in the present embodiment, it is assumed that (Wsys2 = Wsys1 ) is used for estimation.

In this way, the control device 4 estimates the individual total power consumption Wsys1 (see S407 ), estimates the waste heat operation power consumption Wsys2 (see S408 ), and the process of the control device 4 ends step S201 in FIG. 3 and proceeds to step S202 .

Next, the case where the rotation speed Ncp_ac of the air-conditioning compressor in step S403 is not equal to or greater than the minimum rotation speed Ncp_acmin of the air-conditioning compressor (S403/NO) will be described.

The air-conditioning compressor 11 cannot operate at a rotation speed lower than the minimum rotation speed Ncp_acmin of the air-conditioning compressor. Therefore, the target rotation speed Ncp_ac of the air-conditioning compressor estimated from the air-conditioning load Qac is lower than the minimum rotation speed Ncp_acmin of the air-conditioning compressor. In case, the number of compressor revolutions is rotated under Ncp_acmin. Therefore, since the actually output air-conditioning capacity is larger than the air-conditioning load Qac by Ncp_acmin/Ncp_ac, the controller 4 performs intermittent operation in which the air-conditioning compressor 11 is repeatedly operated and stopped. Therefore, the efficiency of the air conditioning hot water supply system S deteriorates.

In step S409, the control device 4 estimates the air conditioning power consumption deterioration rate ε during intermittent operation. In addition, the air conditioning power consumption Wac1 considering intermittent operation is estimated. In addition, the air conditioning power consumption deterioration rate ε is estimated from the air conditioning compressor target rotation speed Ncp_ac and the air conditioning compressor minimum rotation speed Ncp_acmin. In addition, the air conditioning power consumption Wac1 considering intermittent operation is estimated from the air conditioning load Qac estimated in step S401, the outdoor temperature Tao, the indoor set temperature Tac_set, and the air conditioning power consumption deterioration rate ε.

In step S410, the control device 4 estimates the hot water supply load Qec. Also, the hot water supply load Qec is estimated from the outdoor temperature Tao, the supplied water temperature Twi, the hot water supply temperature Two, and the supplied water flow rate Vw.

In step S411, the control device 4 estimates the hot water supply power consumption Wec. Furthermore, the hot water supply power consumption Wec is estimated based on the hot water supply load Qec, the outdoor temperature Tao, and the hot water supply temperature Two estimated in step S304.

In step S412, the control device 4 estimates the total individual power consumption Wsys1. Also, the total power consumption Wsys1 is estimated by adding the power consumption Wac1 for air conditioning in consideration of intermittent operation estimated in step S409 and the power consumption Wec for hot water supply estimated in step S411 (that is, Wsys=Wac1+Wec).

In step S413, the control device 4 estimates the air-conditioning simulated load Qac_ec. Furthermore, the simulated air conditioning load Qac_ec is estimated from the outdoor temperature Tao, the supply water temperature Twi, the hot water supply temperature Two, and the supply water flow rate Vw.

Here, when the air conditioning hot water supply system S is operationally controlled in the heating and hot water supply operation (air conditioning excess heating) mode (refer to FIG. 13 described later), the air in the air conditioning refrigerant circuit 10 The conditioning use-side heat exchanger 15 functions as a condenser, and the intermediate heat exchanger 21 of the air-conditioning refrigerant circuit 10 also functions as a condenser.

Therefore, it is estimated that the hot water supply heat absorption amount in the intermediate heat exchanger 21 of the hot water supply refrigerant circuit 40 is the air conditioning simulated load Qac_ec in the intermediate heat exchanger 21 of the air conditioning refrigerant circuit 10 . Air conditioning simulated load Qac_ec.

In step S414, the control device 4 estimates the air-conditioning load Qac2 in consideration of the air-conditioning simulated load Qac_ec. Furthermore, the air conditioning load Qac estimated in step S401 and the air conditioning simulated load Qac_ec estimated in step S413 are added (that is, Qac2=Qac+Qac_ec) to estimate the air conditioning load Qac2 in consideration of the simulated load.

In step S415, the control device 4 estimates the air conditioning power consumption Wac2 in consideration of the simulated load. Furthermore, the air conditioning power consumption Wac2 is estimated from the air conditioning load Qac2 in consideration of the simulated load estimated in step S414, the outdoor temperature Tao, and the indoor set temperature Tac_set.

In step S416, the control device 4 estimates hot water supply power consumption Wec2 in consideration of the simulated load. In addition, hot water is estimated from the air conditioning load Qac2 estimated in step S414 considering the simulated load, the hot water supply load Qec estimated in step S410, the outdoor temperature Tao, the hot water supply temperature Two, and the indoor set temperature Tac_set. Power consumption Wec2 is supplied.

In step S417, the control device 4 estimates the waste heat operation power consumption Wsys2. In addition, the air conditioning system power consumption Wac2 estimated in step S415 considering the simulated load and the hot water supply system power consumption Wec2 estimated in step S416 considering the simulated load are added (Wsys2=Wac2+Wec2) to obtain The power consumption Wsys2 for waste heat operation is estimated.

In this way, the control device 4 estimates the individual total power consumption Wsys1 (see S407 and S412 ), estimates the waste heat operation power consumption Wsys2 (see S408 and S417 ), and the process of the control device 4 ends step S201 in FIG. 3 and proceeds to step S202 .

(Control processing for each operation mode)

The control device 4 determines the operation mode of the air-conditioning and hot-water supply system S (see FIGS. 2 and 3 ), and controls the air-conditioning and hot-water supply system S in accordance with the determined operation mode to perform various operations. Each operation mode of the air conditioning and hot water supply system S performed by the control device 4 will be described using FIGS. 6 to 13 .

In addition, in FIGS. 6 to 13 described below, the pipes through which the first refrigerant, the second refrigerant, the heat transfer medium, and the liquid to be heated flow are indicated by thick lines, and flow directions are indicated by arrows. In addition, for each control valve (the first air conditioning control valve 23, the second air conditioning control valve 33, the first air conditioning control three-way valve 22, the second air conditioning control three-way valve 32, the first hot water supply control three-way The through valve 45 , the second hot water supply control three-way valve 46 , and the air-conditioning auxiliary expansion valve 16 ) are shown in black on the side that closes the flow.

(operation mode 0. standby mode: step S103)

In this mode, the refrigerant circuit 10 for air conditioning, the refrigerant circuit 40 for hot water supply, the heat transfer medium circulation circuit 50 for air conditioning, and the hot water supply circuit 60 are stopped. The control device 4 waits for an input of an operation command. When an operation command is input, the operation mode of the air conditioning and hot water supply system S is determined (see FIGS. 2 and 3 ).

(Operation mode 1. Hot water supply operation mode: step S104)

Fig. 6 is a systematic diagram showing the flows of refrigerant and heated liquid in the heat pump unit 1 in the hot water supply operation mode.

In this mode, the air-conditioning refrigerant circuit 10 and the air-conditioning heat transfer medium circulation circuit 50 are stopped. In addition, the flow of the refrigerant to the intermediate heat exchanger 21 is closed together with the air conditioning refrigerant circuit 10 and the hot water supply refrigerant circuit 40 .

The refrigerant circuit 40 for hot water supply will be described. The control device 4 controls the first hot water supply control three-way valve 45 so that the side connected to the intermediate heat exchanger 21 is closed, so that the second refrigerant can flow between the hot water supply main expansion valve 43 and the hot water supply heat source side. between the heat exchangers 44 . In addition, the control device 4 controls the second hot water supply control three-way valve 46 so that the side connected to the intermediate heat exchanger 21 is closed so that the second refrigerant can supply hot water to the heat source side heat exchanger 44 and the hot water. The supply compressors 41 communicate with each other. In addition, the control device 4 controls the opening (throttling) of the hot water supply main expansion valve 43 . In addition, the controller 4 controls the rotation speeds of the hot water supply compressor 41 and the hot water supply fan 44a.

The high-temperature and high-pressure second refrigerant discharged from the hot-water supply compressor 41 flows into the primary-side heat transfer pipe 42a of the hot-water supply use-side heat exchanger 42 functioning as a condenser. The second refrigerant flowing through the primary side heat transfer pipe 42 a of the hot water supply and use side heat exchanger 42 exchanges heat with the heated liquid flowing through the secondary side heat transfer pipe 42 b of the hot water supply and use side heat exchanger 42 . Thereby dissipating heat and becoming the second refrigerant with medium temperature and high pressure. The medium-temperature and high-pressure second refrigerant flowing out of the primary-side heat transfer pipe 42a of the hot-water supply use-side heat exchanger 42 is decompressed by the hot-water supply main expansion valve 43 to become a low-temperature and low-pressure second refrigerant.

Then, the low-temperature and low-pressure second refrigerant flows into the hot water supply heat source side heat exchanger 44 functioning as an evaporator. The second refrigerant flowing in the hot water supply heat source side heat exchanger 44 exchanges heat with the air (outdoor air) sent by the hot water supply fan 44a, thereby absorbing heat from the air (outdoor air) (absorbing heat). ). Then, the second refrigerant having absorbed heat is sent from the hot water supply heat source side heat exchanger 44 to the hot water supply compressor 41 and circulates in the hot water supply refrigerant circuit 40 .

Next, the hot water supply circuit 60 will be described. The control device 4 controls the rotational speed of the second pump 61 .

By driving the second pump 61 , the liquid to be heated flowing out from the lower part of the tank 62 flows into the secondary side heat transfer pipe 42 b of the hot water supply usage side heat exchanger 42 . The liquid to be heated flowing in the secondary side heat conduction pipe 42b of the hot water supply use side heat exchanger 42 is heated by the second refrigerant flowing in the primary side heat conduction pipe 42a of the hot water supply use side heat exchanger 42. The heat is exchanged to absorb heat and become a high-temperature heated liquid. Then, the high-temperature heated liquid is returned from the secondary-side heat transfer pipe 42b of the hot water supply use-side heat exchanger 42 to the upper portion of the tank 62, and the high-temperature heated liquid is stored.

(Operation mode 2. Cooling operation mode: step S107)

Fig. 7 is a system diagram showing the flow of refrigerant and heat transfer medium in the heat pump unit 1 in the cooling operation mode.

In this mode, the hot water supply refrigerant circuit 40 and the hot water supply circuit 60 are stopped. In addition, the flow of the refrigerant to the intermediate heat exchanger 21 is closed together with the air conditioning refrigerant circuit 10 and the hot water supply refrigerant circuit 40 .

The refrigerant circuit 10 for air conditioning will be described. The control device 4 controls the four-way valve 12 for air conditioning to be in the cooling operation position. In addition, the control device 4 controls the first air-conditioning control three-way valve 22 so that the side connected to the intermediate heat exchanger 21 is closed so that the first refrigerant can exchange heat between the air-conditioning compressor 11 and the air-conditioning heat source side. flow between devices 13. In addition, the control device 4 controls the second air-conditioning control three-way valve 32 so that the side connected to the bypass circuit 31 is closed, so that the first refrigerant can flow through the air-conditioning use-side heat exchanger 15 and the air-conditioning compressor. Circulation between 11. In addition, the control device 4 controls the first air conditioning control valve 23 and the second air conditioning control valve 33 to be closed, and controls the opening degree of the air conditioning auxiliary expansion valve 16 to be fully opened. In addition, the control device 4 controls the opening (throttling) of the air-conditioning main expansion valve 14 . Moreover, the control apparatus 4 controls the rotation speed of the compressor 11 for air conditioning, and the fan 13a for air conditioning.

The high-temperature and high-pressure first refrigerant discharged from the air-conditioning compressor 11 flows into the air-conditioning heat source side heat exchanger 13 functioning as a condenser. The first refrigerant flowing through the air-conditioning heat source side heat exchanger 13 exchanges heat with the air (outdoor air) sent by the air-conditioning fan 13 a to dissipate heat (exhaust heat), and becomes a medium-temperature and high-pressure first refrigerant. The medium-temperature and high-pressure first refrigerant flowing out of the air-conditioning heat source side heat exchanger 13 is decompressed by the air-conditioning main expansion valve 14 to become a low-temperature and low-pressure first refrigerant.

Then, the low-temperature and low-pressure first refrigerant flows into the secondary-side heat transfer pipe 15 b of the air-conditioning use-side heat exchanger 15 functioning as an evaporator. The first refrigerant circulating in the secondary side heat transfer pipe 15b of the air conditioning use side heat exchanger 15 exchanges heat with the heat transfer medium circulating in the primary side heat transfer pipe 15a of the air conditioning use side heat exchanger 15, by This draws heat (endotherms) from the heat transport medium. Then, the first refrigerant having absorbed heat is sent from the air-conditioning use-side heat exchanger 15 to the air-conditioning compressor 11 and circulates in the air-conditioning refrigerant circuit 10 .

Next, the heat transfer medium circulation circuit 50 for air conditioning will be described. The control device 4 controls the rotation speeds of the first pump 51 and the indoor fan 53a. In addition, the control device 4 controls the heat transfer medium four-way valve 52 so that the heat transfer medium flowing through the primary side heat transfer pipe 15 a of the air conditioning use side heat exchanger 15 and the heat transfer medium on the secondary side of the air conditioning use side heat exchanger 15 The first refrigerant flowing through the tube 15b flows in the reverse direction.

By driving the first pump 51 , the heat transfer medium flows into the primary-side heat transfer pipe 15 a of the air-conditioning use-side heat exchanger 15 . The heat transfer medium flowing through the primary side heat transfer pipe 15 a of the air conditioning use side heat exchanger 15 is converted by heat exchange with the first refrigerant flowing through the secondary side heat transfer pipe 15 b of the air conditioning use side heat exchanger 15 . Dissipate heat and become a low-temperature heat transfer medium.

Then, the low-temperature heat transfer medium flows into the indoor heat exchanger 53 of the indoor unit 2 . The heat transfer medium flowing through the indoor heat exchanger 53 absorbs heat by exchanging heat with the air (indoor air) sent by the indoor fan 53a. Then, the heat transfer medium having absorbed heat is sent from the indoor heat exchanger 53 to the first pump 51 and circulated in the heat transfer medium circulation circuit 50 for air conditioning.

In this way, the heat transfer medium absorbs heat through the indoor heat exchanger 53 of the indoor unit 2 , thereby cooling the air (indoor air) and cooling the room (air-conditioned space).

(Operation mode 3. Heating operation mode: step S108)

Fig. 8 is a systematic diagram showing the flow of refrigerant and heat transfer medium in the heat pump unit 1 in the heating operation mode.

In this mode, the hot water supply refrigerant circuit 40 and the hot water supply circuit 60 are stopped. In addition, the flow of the refrigerant to the intermediate heat exchanger 21 is closed together with the air conditioning refrigerant circuit 10 and the hot water supply refrigerant circuit 40 .

The refrigerant circuit 10 for air conditioning will be described. The control device 4 controls the four-way valve 12 for air conditioning to be in the heating operation position. In addition, the control device 4 controls the first air-conditioning control three-way valve 22 so that the side connected to the intermediate heat exchanger 21 is closed so that the first refrigerant can exchange heat between the air-conditioning compressor 11 and the air-conditioning heat source side. flow between devices 13. In addition, the control device 4 controls the second air-conditioning control three-way valve 32 so that the side connected to the bypass circuit 31 is closed, so that the first refrigerant can flow through the air-conditioning use-side heat exchanger 15 and the air-conditioning compressor. Circulation between 11. In addition, the control device 4 controls the first air conditioning control valve 23 and the second air conditioning control valve 33 to be closed, and controls the opening degree of the air conditioning main expansion valve 14 to be fully opened. In addition, the control device 4 controls the opening (throttling) of the auxiliary expansion valve 16 for air conditioning. Moreover, the control apparatus 4 controls the rotation speed of the compressor 11 for air conditioning, and the fan 13a for air conditioning.

The high-temperature and high-pressure first refrigerant discharged from the air-conditioning compressor 11 flows into the secondary-side heat transfer pipe 15 b of the air-conditioning use-side heat exchanger 15 functioning as a condenser. The first refrigerant flowing in the secondary-side heat transfer pipe 15b of the air-conditioning use-side heat exchanger 15 exchanges heat with the heat transfer medium flowing in the primary-side heat transfer pipe 15a of the air-conditioning use-side heat exchanger 15 to dissipate heat. , becoming the first refrigerant for medium temperature and high pressure. The medium-temperature and high-pressure first refrigerant flowing out of the air-conditioning use-side heat exchanger 15 is decompressed by the air-conditioning auxiliary expansion valve 16 to become a low-temperature and low-pressure first refrigerant.

Then, the low-temperature and low-pressure first refrigerant flows into the air-conditioning heat source side heat exchanger 13 functioning as an evaporator. The first refrigerant flowing through the air-conditioning heat source side heat exchanger 13 exchanges heat with the air (outdoor air) sent by the air-conditioning fan 13 a to absorb heat (absorb heat) from the air (outdoor air). Then, the first refrigerant having absorbed heat is sent from the air-conditioning heat source side heat exchanger 13 to the air-conditioning compressor 11 and circulates in the air-conditioning refrigerant circuit 10 .

Next, the heat transfer medium circulation circuit 50 for air conditioning will be described. The control device 4 controls the rotation speeds of the first pump 51 and the indoor fan 53a. In addition, the control device 4 controls the heat transfer medium four-way valve 52 so that the heat transfer medium flowing through the primary side heat transfer pipe 15 a of the air conditioning use side heat exchanger 15 and the heat transfer medium on the secondary side of the air conditioning use side heat exchanger 15 The first refrigerant flowing through the tube 15b flows in the reverse direction.

By driving the first pump 51 , the heat transfer medium flows into the primary-side heat transfer pipe 15 a of the air-conditioning use-side heat exchanger 15 . The heat transfer medium flowing through the primary side heat transfer pipe 15 a of the air conditioning use side heat exchanger 15 is converted by heat exchange with the first refrigerant flowing through the secondary side heat transfer pipe 15 b of the air conditioning use side heat exchanger 15 . It absorbs heat and becomes a high-temperature heat transfer medium.

Then, the high-temperature heat transfer medium flows into the indoor heat exchanger 53 of the indoor unit 2 . The heat transfer medium flowing through the indoor heat exchanger 53 dissipates heat by exchanging heat with air (indoor air) sent by the indoor fan 53 a. Then, the heat transfer medium that dissipates heat is sent from the indoor heat exchanger 53 to the first pump 51 and circulates in the heat transfer medium circulation circuit 50 for air conditioning.

In this way, the heat transfer medium dissipates heat through the indoor heat exchanger 53 of the indoor unit 2 , thereby heating the air (indoor air) and heating the room (space to be air-conditioned).

(Operation mode 4-1. Cooling and hot water supply operation (exhaust heat recovery A) mode: step S112)

FIG. 9 is a system diagram showing the flows of the refrigerant, the heat transfer medium, and the liquid to be heated in the heat pump unit 1 in the cooling and hot water supply operation (exhaust heat recovery A) mode.

Here, exhaust heat recovery A is the case of "air conditioning exhaust heat > hot water supply heat absorption", and the exhaust heat of the air conditioning refrigerant circuit 10 is recovered by the hot water supply refrigerant circuit 40 via the intermediate heat exchanger 21, Excess air conditioning heat rejection to outside air.

The operation of the hot water supply circuit 60 is the same as that in the hot water supply operation mode shown in FIG. 6 , and description thereof will be omitted.

The operation of the heat transfer medium circulation circuit 50 for air conditioning is the same as that in the cooling operation mode shown in FIG. 7 , and description thereof will be omitted.

The refrigerant circuit 10 for air conditioning will be described. Differences between the air-conditioning refrigerant circuit 10 in the cooling operation mode (see FIG. 7 ) and the air-conditioning refrigerant circuit 10 in the cooling and hot water supply operation (exhaust heat recovery A) mode (see FIG. 9 ) The point is that in the cooling operation mode (see FIG. 7 ), the first refrigerant flows through the air-conditioning heat source side heat exchanger 13 , whereas in the cooling and hot water supply operation (exhaust heat recovery A) mode ( Referring to FIG. 9 ), the first refrigerant flows through the primary side heat transfer pipe 21 a of the intermediate heat exchanger 21 and the air conditioning heat source side heat exchanger 13 .

That is, in order to allow the first refrigerant to flow between the air-conditioning compressor 11 and the intermediate heat exchanger 21, the control device 4 opens the valve so that the first refrigerant can flow between the air-conditioning compressor 11 and the air-conditioning heat source. The refrigerant flows between the side heat exchangers 13 and controls the opening degree (the flow ratio of the first refrigerant flowing) from the air conditioning compressor 11 to the intermediate heat exchanger 21 or the air conditioning heat source side heat exchanger 13 . In addition, the control device 4 controls to open the first air-conditioning control valve 23 . Other controls are the same as those of the air-conditioning refrigerant circuit 10 in the cooling operation mode (see FIG. 7 ), and description thereof will be omitted.

The high-temperature and high-pressure first refrigerant discharged from the air-conditioning compressor 11 is branched by the first air-conditioning control three-way valve 22 and partly flows into the primary-side heat transfer pipe 21a of the intermediate heat exchanger 21 functioning as a condenser. The first refrigerant flowing through the primary-side heat transfer pipe 21a of the intermediate heat exchanger 21 dissipates heat by exchanging heat with the second refrigerant flowing through the secondary-side heat transfer pipe 21b of the intermediate heat exchanger 21, and becomes a medium temperature and high pressure refrigerant. the first refrigerant. The remaining high-temperature and high-pressure first refrigerant branched by the first air-conditioning control three-way valve 22 flows into the air-conditioning heat source side heat exchanger 13 functioning as a condenser. The first refrigerant flowing through the air-conditioning heat source side heat exchanger 13 exchanges heat with the air (outdoor air) sent by the air-conditioning fan 13 a to dissipate heat (exhaust heat), and becomes a medium-temperature and high-pressure first refrigerant. The medium-temperature and high-pressure first refrigerant flowing out from the primary-side heat transfer pipe 21a of the intermediate heat exchanger 21 and the medium-temperature and high-pressure first refrigerant flowing out from the air-conditioning heat source side heat exchanger 13 are reduced by the air-conditioning main expansion valve 14. pressure, becoming the first refrigerant for low temperature and low pressure.

Then, the low-temperature and low-pressure first refrigerant flows into the secondary-side heat transfer pipe 15 b of the air-conditioning use-side heat exchanger 15 functioning as an evaporator. The first refrigerant circulating in the secondary side heat transfer pipe 15b of the air conditioning use side heat exchanger 15 exchanges heat with the heat transfer medium circulating in the primary side heat transfer pipe 15a of the air conditioning use side heat exchanger 15, by This draws heat (endotherms) from the heat transport medium. Then, the first refrigerant having absorbed heat is sent from the air-conditioning use-side heat exchanger 15 to the air-conditioning compressor 11 and circulates in the air-conditioning refrigerant circuit 10 .

Next, the hot water supply refrigerant circuit 40 will be described. Between the hot water supply refrigerant circuit 40 in the hot water supply operation mode (see FIG. 6 ) and the hot water supply refrigerant circuit 40 in the cooling and hot water supply operation (exhaust heat recovery A) mode (see FIG. 9 ) The difference between them is that in the hot water supply operation mode (refer to FIG. 6 ), the second refrigerant flows through the hot water supply heat source side heat exchanger 44 , whereas in the cooling and hot water supply operation (heat removal In the recovery A) mode (see FIG. 9 ), the second refrigerant flows through the secondary side heat transfer pipe 21 b of the intermediate heat exchanger 21 .

That is, the control device 4 controls the first hot water supply control three-way valve 45 so that the side connected to the hot water supply heat source side heat exchanger 44 is closed so that the second refrigerant can flow through the hot water supply main expansion valve 43 . and intermediate heat exchanger 21. In addition, the control device 4 controls the second hot water supply control three-way valve 46 so that the side connected to the hot water supply heat source side heat exchanger 44 is closed so that the second refrigerant can flow between the intermediate heat exchanger 21 and the hot water. The supply compressors 41 communicate with each other. In addition, the control device 4 stops the fan 44a for hot water supply. Other controls are the same as those of the hot water supply refrigerant circuit 40 in the hot water supply operation mode (see FIG. 6 ), and description thereof will be omitted.

The high-temperature and high-pressure second refrigerant discharged from the hot-water supply compressor 41 flows into the primary-side heat transfer pipe 42a of the hot-water supply use-side heat exchanger 42 functioning as a condenser. The second refrigerant flowing through the primary side heat transfer pipe 42 a of the hot water supply and use side heat exchanger 42 exchanges heat with the heated liquid flowing through the secondary side heat transfer pipe 42 b of the hot water supply and use side heat exchanger 42 . Thereby dissipating heat and becoming the second refrigerant with medium temperature and high pressure. The medium-temperature and high-pressure second refrigerant flowing out of the primary-side heat transfer pipe 42a of the hot-water supply use-side heat exchanger 42 is decompressed by the hot-water supply main expansion valve 43 to become a low-temperature and low-pressure second refrigerant.

Then, the low-temperature and low-pressure second refrigerant flows into the secondary-side heat transfer pipe 21b of the intermediate heat exchanger 21 functioning as an evaporator. The second refrigerant flowing through the secondary side heat transfer pipe 21b of the intermediate heat exchanger 21 exchanges heat with the first refrigerant flowing through the primary side heat transfer pipe 21a of the intermediate heat exchanger 21, thereby cooling from the first refrigerant. The agent absorbs heat (endotherms). Then, the second refrigerant having absorbed heat is sent from the secondary side heat transfer pipe 21 b of the intermediate heat exchanger 21 to the compressor 41 for hot water supply, and circulates in the refrigerant circuit 40 for hot water supply.

(Operation mode 4-2. Cooling and hot water supply operation (exhaust heat recovery B) mode: step S114)

10 is a systematic diagram showing the flows of the refrigerant, the heat transfer medium, and the liquid to be heated in the heat pump unit 1 in the cooling and hot water supply operation (exhaust heat recovery B) mode.

Here, exhaust heat recovery B is the case of "air conditioning exhaust heat = hot water supply and heat absorption", and the exhaust heat of the air conditioning refrigerant circuit 10 is recovered by the hot water supply refrigerant circuit 40 via the intermediate heat exchanger 21 .

The operation of the hot water supply circuit 60 is the same as that in the hot water supply operation mode shown in FIG. 6 , and description thereof will be omitted.

The operation of the heat transfer medium circulation circuit 50 for air conditioning is the same as that in the cooling operation mode shown in FIG. 7 , and description thereof will be omitted.

The operation of the hot water supply refrigerant circuit 40 is the same as that in the cooling and hot water supply operation (exhaust heat recovery A) mode shown in FIG. 9 , and description thereof will be omitted.

The refrigerant circuit 10 for air conditioning will be described. Differences between the air-conditioning refrigerant circuit 10 in the cooling operation mode (see FIG. 7 ) and the air-conditioning refrigerant circuit 10 in the cooling and hot water supply operation (exhaust heat recovery B) mode (see FIG. 10 ) The point is that in the cooling operation mode (see FIG. 7 ), the first refrigerant flows through the air-conditioning heat source side heat exchanger 13 , whereas in the cooling and hot water supply operation (exhaust heat recovery B) mode ( Referring to FIG. 10 ), the first refrigerant flows through the primary side heat transfer pipe 21 a of the intermediate heat exchanger 21 .

That is, the control device 4 controls the first air-conditioning control three-way valve 22 so that the side connected to the air-conditioning heat source side heat exchanger 13 is closed so that the first refrigerant can exchange heat between the air-conditioning compressor 11 and the intermediate. flow between devices 21. In addition, the control device 4 controls the first air conditioning control valve 23 to open, and controls the opening degree of the air conditioning auxiliary expansion valve 16 to be fully closed. In addition, the control device 4 stops the air-conditioning fan 13a. Other controls are the same as those of the air-conditioning refrigerant circuit 10 in the cooling operation mode (see FIG. 7 ), and description thereof will be omitted.

The high-temperature and high-pressure first refrigerant discharged from the air-conditioning compressor 11 flows into the primary-side heat transfer pipe 21 a of the intermediate heat exchanger 21 functioning as a condenser. The first refrigerant flowing through the primary-side heat transfer pipe 21a of the intermediate heat exchanger 21 exchanges heat with the second refrigerant flowing through the secondary-side heat transfer pipe 21b of the intermediate heat exchanger 21 to dissipate heat, and becomes a medium-temperature and high-pressure refrigerant. first refrigerant. The medium-temperature and high-pressure first refrigerant flowing out of the primary-side heat transfer pipe 21 a of the intermediate heat exchanger 21 is decompressed by the air-conditioning main expansion valve 14 to become a low-temperature and low-pressure first refrigerant.

Then, the low-temperature and low-pressure first refrigerant flows into the secondary-side heat transfer pipe 15 b of the air-conditioning use-side heat exchanger 15 functioning as an evaporator. The first refrigerant circulating in the secondary side heat transfer pipe 15b of the air conditioning use side heat exchanger 15 exchanges heat with the heat transfer medium circulating in the primary side heat transfer pipe 15a of the air conditioning use side heat exchanger 15, by This draws heat (endotherms) from the heat transport medium. Then, the first refrigerant having absorbed heat is sent from the air-conditioning use-side heat exchanger 15 to the air-conditioning compressor 11 and circulates in the air-conditioning refrigerant circuit 10 .

(Operation mode 4-3. Cooling and hot water supply operation (exhaust heat recovery C) mode: step S115)

FIG. 11 is a systematic diagram showing the flows of the refrigerant, the heat transfer medium, and the liquid to be heated in the heat pump unit 1 in the cooling and hot water supply operation (exhaust heat recovery C) mode.

Here, exhaust heat recovery C is the case of "air conditioning exhaust heat<hot water supply heat absorption", and the exhaust heat of the air conditioning refrigerant circuit 10 is recovered by the hot water supply refrigerant circuit 40 via the intermediate heat exchanger 21, The hot water supply absorbs the insufficient amount of heat from the outdoor air.

The operation of the hot water supply circuit 60 is the same as that in the hot water supply operation mode shown in FIG. 6 , and description thereof will be omitted.

The operation of the heat transfer medium circulation circuit 50 for air conditioning is the same as that in the cooling operation mode shown in FIG. 7 , and description thereof will be omitted.

The operation of the air-conditioning refrigerant circuit 10 is the same as that in the cooling and hot water supply operation (exhaust heat recovery B) mode shown in FIG. 10 , and description thereof will be omitted.

Next, the hot water supply refrigerant circuit 40 will be described. Between the hot water supply refrigerant circuit 40 in the hot water supply operation mode (see FIG. 6 ) and the hot water supply refrigerant circuit 40 in the cooling and hot water supply operation (exhaust heat recovery C) mode (see FIG. 11 ) The difference between them is that in the hot water supply operation mode (refer to FIG. 6 ), the second refrigerant flows through the hot water supply heat source side heat exchanger 44 , whereas in the cooling and hot water supply operation (heat removal In the recovery C) mode (see FIG. 11 ), the second refrigerant flows through the secondary side heat transfer pipe 21 b of the intermediate heat exchanger 21 and the hot water supply heat source side heat exchanger 44 .

That is, the control device 4 opens the valve so that the second refrigerant can flow between the hot water supply main expansion valve 43 and the intermediate heat exchanger 21 so that the second refrigerant can flow through the hot water supply main expansion valve 43 . and the hot water supply heat source side heat exchanger 44, and control the opening degree from the hot water supply main expansion valve 43 to the intermediate heat exchanger 21 or the hot water supply heat source side heat exchanger 44 (the second cooling agent flow ratio). In addition, the control device 4 opens the valve so that the second refrigerant can flow between the intermediate heat exchanger 21 and the hot water supply compressor 41 so that the second refrigerant can flow through the hot water supply heat source side heat exchanger 44 . and the hot water supply compressor 41, and control the opening degree from the intermediate heat exchanger 21 or the hot water supply heat source side heat exchanger 44 to the hot water supply compressor 41 (the flow rate of the second refrigerant flowing Proportion). Other controls are the same as those of the hot water supply refrigerant circuit 40 in the hot water supply operation mode (see FIG. 6 ), and description thereof will be omitted.

The high-temperature and high-pressure second refrigerant discharged from the hot-water supply compressor 41 flows into the primary-side heat transfer pipe 42a of the hot-water supply use-side heat exchanger 42 functioning as a condenser. The second refrigerant flowing through the primary side heat transfer pipe 42 a of the hot water supply and use side heat exchanger 42 exchanges heat with the heated liquid flowing through the secondary side heat transfer pipe 42 b of the hot water supply and use side heat exchanger 42 . Thereby dissipating heat and becoming the second refrigerant with medium temperature and high pressure. The medium-temperature and high-pressure second refrigerant flowing out of the primary-side heat transfer pipe 42a of the hot-water supply use-side heat exchanger 42 is decompressed by the hot-water supply main expansion valve 43 to become a low-temperature and low-pressure second refrigerant.

Then, the low-temperature and low-pressure second refrigerant is branched by the first hot water supply control three-way valve 45 and partly flows into the secondary side heat transfer pipe 21b of the intermediate heat exchanger 21 functioning as an evaporator. The second refrigerant flowing through the secondary side heat transfer pipe 21 b of the intermediate heat exchanger 21 exchanges heat with the first refrigerant flowing through the primary side heat transfer pipe 21 a of the intermediate heat exchanger 21 . Draws heat (endotherms). In addition, the remaining low-temperature and low-pressure second refrigerant branched by the first hot water supply control three-way valve 45 flows into the hot water supply heat source side heat exchanger 44 functioning as an evaporator. The second refrigerant flowing through the hot water supply heat source side heat exchanger 44 exchanges heat with air (outdoor air) sent by the hot water supply fan 44 a to absorb heat (absorb heat) from the air (outdoor air). The second refrigerant flowing through the secondary side heat transfer pipe 21 b of the intermediate heat exchanger 21 absorbs heat (absorbs heat) and the second refrigerant flows through the hot water supply heat source side heat exchanger 44 and absorbs heat (absorbs heat). The second refrigerant joins at the second hot water supply control three-way valve 46 , is sent to the hot water supply compressor 41 , and circulates in the hot water supply refrigerant circuit 40 .

(Operation mode 5-1. Heating and hot water supply operation (independent) mode: step S203)

FIG. 12 is a system diagram showing the flows of the refrigerant, the heat transfer medium, and the liquid to be heated in the heat pump unit 1 in the heating and hot water supply operation (independent) mode.

In this mode, the flow of the refrigerant to the intermediate heat exchanger 21 is closed together with the air conditioning refrigerant circuit 10 and the hot water supply refrigerant circuit 40 .

Operations of the hot water supply refrigerant circuit 40 and the hot water supply circuit 60 are the same as those in the hot water supply operation mode shown in FIG. 6 , and description thereof will be omitted.

The operations of the air-conditioning refrigerant circuit 10 and the air-conditioning heat transfer medium circulation circuit 50 are the same as those in the heating operation mode shown in FIG. 8 , and description thereof will be omitted.

(Operation mode 5-2. Heating and hot water supply operation (air conditioning residual heating) mode: step S204)

FIG. 13 is a system diagram showing the flows of the refrigerant, the heat transfer medium, and the liquid to be heated in the heat pump unit 1 in the heating and hot water supply operation (air conditioning residual heating) mode.

This mode is executed when the air conditioning load (heating load) is small, and the waste heat of the air conditioning refrigerant circuit 10 is recovered by the hot water supply refrigerant circuit 40 via the intermediate heat exchanger 21 .

The operation of the hot water supply circuit 60 is the same as that in the hot water supply operation mode shown in FIG. 6 , and description thereof will be omitted.

The operation of the heat transfer medium circulation circuit 50 for air conditioning is the same as that in the cooling operation mode shown in FIG. 7 , and description thereof will be omitted.

The operation of the hot water supply refrigerant circuit 40 is the same as the cooling and hot water supply operation (exhaust heat recovery B) shown in FIG. 10 , and description thereof will be omitted.

The refrigerant circuit 10 for air conditioning will be described. The difference between the air conditioning refrigerant circuit 10 in the heating operation mode (see FIG. 8 ) and the air conditioning refrigerant circuit 10 in the heating hot water supply operation (air conditioning excess heating) mode (see FIG. 13 ) is that : In the heating operation mode (refer to FIG. 8 ), the first refrigerant flows through the heat exchanger 15 on the air conditioning use side. On the other hand, in the cooling and hot water supply operation (exhaust heat recovery B) mode (refer to FIG. 10 ), the first refrigerant flows through the primary-side heat transfer pipes 21 a of the air-conditioning use-side heat exchanger 15 and the intermediate heat exchanger 21 .

That is, the control device 4 opens the valve so that the first refrigerant can flow between the air-conditioning compressor 11 and the air-conditioning use-side heat exchanger 15 so that the first refrigerant can flow between the air-conditioning compressor 11 and the air-conditioning use-side heat exchanger 15 . The intermediate heat exchangers 21 communicate with each other, and the opening degree (the flow ratio of the first refrigerant flowing) from the air-conditioning compressor 11 to the air-conditioning use side heat exchanger 15 or the intermediate heat exchanger 21 is controlled. In addition, the control device 4 performs control such that the first air conditioning control valve 23 and the second air conditioning control valve 33 are opened. Other controls are the same as those of the air-conditioning refrigerant circuit 10 in the heating operation mode (see FIG. 8 ), and description thereof will be omitted.

The high-temperature and high-pressure first refrigerant discharged from the air-conditioning compressor 11 is branched by the second air-conditioning control three-way valve 32 and partly flows into the secondary side of the air-conditioning use-side heat exchanger 15 functioning as a condenser. Heat pipe 15b. The first refrigerant flowing through the secondary side heat transfer pipe 15 b of the air conditioning use side heat exchanger 15 is converted by heat exchange with the heat transfer medium flowing through the primary side heat transfer pipe 15 a of the air conditioning use side heat exchanger 15 . Dissipate heat and become the first refrigerant for medium temperature and high pressure. The remaining high-temperature and high-pressure first refrigerant branched by the second air-conditioning control three-way valve 32 flows through the bypass circuit 31 and flows into the primary-side heat transfer pipe 21 a of the intermediate heat exchanger 21 functioning as a condenser. The first refrigerant flowing through the primary-side heat transfer pipe 21a of the intermediate heat exchanger 21 exchanges heat with the second refrigerant flowing through the secondary-side heat transfer pipe 21b of the intermediate heat exchanger 21 to dissipate heat, and becomes a medium-temperature and high-pressure refrigerant. first refrigerant. The medium-temperature and high-pressure first refrigerant flowing out from the heat exchanger 15 on the air conditioning use side and the medium-temperature and high-pressure first refrigerant flowing out from the primary side heat transfer pipe 21a of the intermediate heat exchanger 21 are reduced by the auxiliary expansion valve 16 for air conditioning. pressure, becoming the first refrigerant for low temperature and low pressure.

Then, the low-temperature and low-pressure first refrigerant flows into the air-conditioning heat source side heat exchanger 13 functioning as an evaporator. The first refrigerant flowing through the air-conditioning heat source side heat exchanger 13 exchanges heat with the air (outdoor air) sent by the air-conditioning fan 13 a to absorb heat (absorb heat) from the air (outdoor air). Then, the first refrigerant having absorbed heat is sent from the air-conditioning heat source side heat exchanger 13 to the air-conditioning compressor 11 and circulates in the air-conditioning refrigerant circuit 10 .

<<Functions and effects of the air conditioning and hot water supply system of this embodiment>>

As described above, according to the air-conditioning and hot water supply system S of the present embodiment, it is possible to perform "hot water supply operation", "cooling operation", "cooling and hot water supply operation", "heating operation" according to user's request. Operation", "heating and hot water supply operation" air-conditioning hot water supply system S.

In addition, in the "cooling and hot water supply operation", it is possible to execute the cooling and hot water supply operation (exhaust heat recovery A) mode (refer to Fig. 9) Cooling and hot water supply operation (exhaust heat recovery B) mode (see FIG. 10 ), and cooling and hot water supply operation (exhaust heat recovery C) mode (see FIG. 11 ).

Thereby, the efficiency of the air-conditioning hot water supply system S as a whole can be improved.

Here, it demonstrates comparing the air-conditioning apparatus (air-conditioning hot water supply system) described in patent document 1, and the air-conditioning hot water supply system S of this embodiment.

In the air-conditioning apparatus (air-conditioning and hot-water supply system) described in Patent Document 1, during heating operation (heating and hot-water supply operation), when the heating load is low, the air-conditioning cycle (air-conditioning refrigerant circuit 10 ) of the first compressor (corresponding to the air-conditioning compressor 11 of the air-conditioning and hot water supply system S of this embodiment) becomes the intermittent operation that repeats the operation state and the stop state, therefore, the air conditioning device (the air-conditioning hot water supply system S The operating efficiency of the supply system) is reduced.

On the other hand, the air-conditioning and hot-water supply system S according to the present embodiment includes the bypass circuit 31 in the air-conditioning refrigerant circuit 10, so that the primary side of the intermediate heat exchanger 21 can be turned on even during heating and hot-water supply operation. The side heat transfer pipe 21 a (on the side of the air-conditioning refrigerant circuit 10 ) functions as a condenser (see FIG. 13 ).

Thus, even when the heating load of the air-conditioning hot water supply system S according to the present embodiment is low during the heating and hot water supply operation, the air conditioning compressor 11 continues to operate and supplies heat to the air conditioning use side. The exchanger 15 supplies desired heat (a part of the high-temperature and high-pressure first refrigerant discharged from the air-conditioning compressor 11), and the remaining heat (a part of the high-temperature and high-pressure first refrigerant discharged from the air-conditioning compressor 11 The remaining portion) is sent to the primary side heat transfer pipe 21a of the intermediate heat exchanger 21 through the bypass circuit 31, and is used for hot water supply and heating through the hot water supply refrigerant circuit 40.

As a result, intermittent operation of the air conditioning compressor 11 can be prevented, and waste heat can also be stored as high-temperature liquid to be heated, so that the overall operating efficiency of the air conditioning hot water supply system S can be improved.

That is, the air-conditioning and hot-water supply system S of the present embodiment can conduct heat (exhaust heat, waste heat) from the air-conditioning refrigerant circuit 10 to the hot-water supply refrigerant circuit 40 even in the cooling operation/heating operation, Therefore, it is possible to construct an air-conditioning and hot-water supply system capable of improving operation efficiency throughout the year.

The effects of the air conditioning and hot water supply system S of the present embodiment will be further described. FIG. 14 is a graph showing fluctuations in heating load on days before and after the coldest day in Tokyo.

Figure 14 sets the vertical axis as heating load [Kw] (indicated by a solid line on the curve in Figure 14), outdoor air temperature [°C] (indicated by a dotted line on the curve in Figure 14), and sunshine [MJ] (in The graph in Figure 14 is represented by a dotted line), and the horizontal axis is set to time [day], which shows from the day before the coldest day (time 1.0 to 2.0 [day]) (time 0.0 to 1.0 [day]) to the next day (2.0～3.0 [day]). In addition, the heating load was calculated for a highly insulated house whose Q value (heat loss coefficient) representing the heat insulation performance was 1.6 [W/m ² ·K].

In response to recent energy-saving demands, attempts are being made to insulate houses (spaces to be air-conditioned) to reduce heating loads in winter. Since the heating load is reduced in a highly insulated house, it is considered that an energy-saving effect is obtained in indoor air conditioning.

However, the air-conditioning compressor 11 of the air-conditioning refrigerant circuit 10 may be intermittently operated due to a decrease in the heating load. As shown in Fig. 14, on the coldest day, the heating load also decreases sharply during the day (from about 4.0 kW to about 0.6 kW in Fig. 14). Here, when the heating load falls below a predetermined value (for example, 1.0 kW), the air-conditioning compressor 11 of the air-conditioning refrigerant circuit 10 is intermittently operated. Such intermittent operation is not ideal in terms of operating efficiency.

In this way, the energy-saving effect obtained when the air-conditioning system (air-conditioning and hot water supply system) is actually operated is compared to the energy-saving effect expected by reducing the heating load due to high insulation of the house, because the air-conditioning compressor 11 is intermittently operated. And reduce.

In contrast, the air conditioning hot water supply system S of this embodiment can prevent intermittent operation of the air conditioning compressor 11 of the air conditioning refrigerant circuit 10 even when the heating load is low during heating operation. In addition, the air conditioning hot water supply system S of this embodiment can also make the primary side heat transfer pipe 21a of the intermediate heat exchanger 21 function as a condenser during the heating operation, so that the air conditioning refrigerant can be used for hot water supply. The residual heat of the circuit 10 can improve the efficiency of the air-conditioning hot water supply system S as a whole.

<<Modification>>

In addition, the air-conditioning hot water supply system S of this embodiment is not limited to the structure of the said embodiment, Various changes are possible in the range which does not deviate from the summary of invention.

For example, in the above-mentioned embodiment, it has been described that the heat transfer medium is heated (or cooled) by the heat exchanger 15 on the air conditioning use side in the heat pump unit 1 and supplied to the indoor unit 2, and the heat transfer medium is supplied to the indoor unit 2 by the indoor heat exchanger of the indoor unit 2. 53 exchanges heat between the heated (or cooled) heat transfer medium and the indoor air, thereby heating (cooling) the room, but it is not limited to this, and the heat transfer medium circulation circuit 50 for air conditioning can also be omitted , the air-conditioning use-side heat exchanger 15 is provided in the indoor unit 2, and heat exchange is performed between the first refrigerant circulating in the air-conditioning use-side heat exchanger 15 and indoor air, thereby performing heating (cooling) Structure.

In addition, in the above-mentioned embodiment, it has been explained that the liquid to be heated is water, the high-temperature liquid to be heated (hot water) is stored in the tank 62, and the high-temperature liquid to be heated (hot water) stored in the tank 62 is supplied to the A hot water supply terminal (not shown), but not limited thereto, may also be configured to further include a high-temperature heated liquid that can be stored in the tank 62 and water supplied to the hot water supply terminal (not shown). A heat exchanger (not shown) for exchanging heat between them heats the supply water with the high-temperature liquid to be heated stored in the tank 62, and then supplies hot water to a hot water supply terminal (not shown). Thus, the liquid to be heated is not limited to water.

In addition, it has been explained that the first air-conditioning control three-way valve 22 branches the first refrigerant flowing in from the air-conditioning compressor 11 (air-conditioning four-way valve 12 ), and can control the flow into the air-conditioning heat source side for heat exchange. The flow rate of the first refrigerant in the intermediate heat exchanger 21 and the flow rate of the first refrigerant flowing into the primary side heat transfer pipe 21a of the intermediate heat exchanger 21 are three-way valves. A flow control valve to control the flow ratio.

Similarly, two flow control valves may be provided for the second air conditioning control three-way valve 32 , the first hot water supply control three-way valve 45 , and the second hot water supply control three-way valve 46 .

In addition, the first air conditioning control valve 23 is not an essential structure, and may not be present. However, by closing the first air-conditioning control valve 23 when the intermediate heat exchanger 21 is not in use, the intermediate heat exchanger 21 can be separated from the circulation circuit of the first refrigerant, so the first air-conditioning control valve 23 is provided. is ideal.

In addition, the second air conditioning control valve 33 is not an essential structure, and may not be present. However, since the bypass circuit 31 can be separated from the first refrigerant circulation circuit by closing the second air conditioning control valve 33 when the bypass circuit 31 is not used, it is desirable to have the second air conditioning control valve 33 of.

Explanation of symbols

S: air conditioning hot water supply system; 1: heat pump unit; 2: indoor unit; 3: hot water supply tank unit; 4: control device; 10: refrigerant circuit for air conditioning; 11: compressor for air conditioning; 12 : Four-way valve for air conditioning (operation switching unit for air conditioning); 13: Air conditioning heat source side heat exchanger; 13a: Fan for air conditioning; 14: Main expansion valve for air conditioning (pressure reducing device, first pressure reducing device) device); 15: air conditioning use side heat exchanger; 15a: primary side heat transfer pipe of air conditioning use side heat exchanger; 15b: secondary side heat transfer pipe of air conditioning use side heat exchanger; 16; auxiliary air conditioning Expansion valve (decompression device, second decompression device); 21: intermediate heat exchanger; 21a: primary side heat transfer pipe of intermediate heat exchanger; 21b: secondary side heat transfer pipe of intermediate heat exchanger; 22: first Air conditioning control three-way valve (first branch); 23: first air conditioning control valve; 24: confluence; 31: bypass circuit; 32: second air conditioning control three-way valve (second branch); 33: Second air conditioning control valve; 40: Refrigerant circuit for hot water supply; 41: Compressor for hot water supply; 42: Heat exchanger for hot water supply use side; 42a: Heat exchanger for hot water supply use side primary side heat pipe; 42b: secondary side heat pipe for hot water supply heat exchanger on use side; 43: main expansion valve for hot water supply (third decompression device); 44: hot water supply heat source side heat exchanger; 44a: fan for hot water supply; 45: first three-way valve for hot water supply control; 46: second three-way valve for hot water supply control; 50: heat transfer medium circulation circuit for air conditioning; 51: first pump; 52 : heat transfer medium four-way valve; 53: indoor heat exchanger; 53a: indoor fan; 60: hot water supply circuit; 61: second pump; 62: tank; 63: water supply connector; 64: hot water supply connector.

Claims (3)

1. An air conditioning hot water supply system comprising an air conditioning refrigerant circuit of a first refrigerant cycle and a hot water supply refrigerant circuit of a second refrigerant cycle, characterized in that, The above refrigerant circuit for air conditioning has: a compressor for air conditioning, which compresses the first refrigerant; an air conditioning operation switching unit that switches the flow direction of the first refrigerant between cooling operation and heating operation; The air conditioning heat source side heat exchanger functions as a condenser during cooling operation and as an evaporator during heating operation; a decompression device, which decompresses the first refrigerant; The air-conditioning use-side heat exchanger that functions as an evaporator during cooling operation and as a condenser during heating operation; and an intermediate heat exchanger that performs heat exchange between the first refrigerant and the second refrigerant, Formed: a first branch part that branches between the above-mentioned air-conditioning compressor and the above-mentioned air-conditioning heat source side heat exchanger to adjust the flow rate of the first refrigerant flowing in the branching direction, between the above-mentioned air-conditioning compressor and the above-mentioned air adjusting the second branch part that uses the branch between the side heat exchangers to adjust the flow rate of the first refrigerant flowing into the branch direction, The above-mentioned intermediate heat exchanger has one end connected to the first branch part and the second branch part, and the other end is connected to the confluence part between the above-mentioned air-conditioning heat source side heat exchanger and the above-mentioned air-conditioning use-side heat exchanger, as the first refrigeration unit. The condenser of the agent plays a role; Wherein, the above-mentioned decompression device has: a first decompression device arranged on the heat exchanger side of the air-conditioning use side with respect to the confluence portion; and The second decompression device is disposed on the air-conditioning heat source side heat exchanger side with respect to the confluence portion. 2. The air conditioning hot water supply system according to claim 1, characterized in that: The decompression device decompresses the first refrigerant by the first decompression device during cooling operation, and decompresses the first refrigerant by the second decompression device during heating operation. 3. The air conditioning hot water supply system according to claim 1 or 2, characterized in that, The above refrigerant circuit for hot water supply has: a compressor for hot water supply, which compresses the second refrigerant; Hot water supply use side heat exchanger, which functions as a condenser during hot water supply operation; a third decompression device that decompresses the second refrigerant; and The above-mentioned intermediate heat exchanger functions as a condenser for the first refrigerant and functions as an evaporator for the second refrigerant.