JP2001099519A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner having one advantage specific to an engine heat pump and the other advantage specific to a motor heat pump. SOLUTION: There is provided an air conditioner in which air heated by a heat pump is supplied to an area to be air conditioned so as to heat the area to be air-conditioned. As a heat pump, there are provided an engine heat pump He in which a compressor 1e is driven by an engine 8 and a motor heat pump Hm in which a compressor 1m is driven by an electric motor 9. There is provided a control means 12 for selectively operating any one of a state of single operation of the engine heat pump for operating only the engine heat pump He; a state of single operation of the motor heat pump for operating only the motor heat pump Hm; and a state of parallel operation of the engine heat pump He and the motor heat pump Hm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for supplying air heated by a heat pump to an air conditioning area to heat the air conditioning area.

[0002]

2. Description of the Related Art Conventionally, such an air conditioner is provided with an engine heat pump in which a compressor is driven by an engine or a motor heat pump in which a compressor is driven by an electric motor. .

[0003]

However, the engine heat pump and the motor heat pump have their own advantages. For example, the engine heat pump is highly efficient when continuously operated at a high output. Further, when the engine heat pump is configured to recover the exhaust heat of the engine and use the recovered exhaust heat for heating, the efficiency can be further improved. With a motor heat pump, when the outside air temperature decreases, the efficiency decreases or the heating capacity decreases.However, to such a degree that the motor heat pump decreases the efficiency or the heating capacity decreases, Even if the outside air temperature decreases, the engine heat pump recovers the exhaust heat of the engine and uses the recovered exhaust heat for heating.
High heating capacity can be obtained. For example, when the heating load fluctuates, the motor heat pump can adjust the output according to the heating load while maintaining high efficiency. However, the conventional air conditioner could not exhibit both advantages unique to the engine heat pump and advantages unique to the motor heat pump.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an air conditioner having both advantages unique to an engine heat pump and advantages unique to a motor heat pump.

[0005]

Means for Solving the Problems [Invention according to claim 1]
The characteristic configuration according to claim 1, wherein the heat pump includes an engine heat pump in which a compressor is driven by an engine and a motor heat pump in which the compressor is driven by an electric motor, and heats the air-conditioning target area. Based on the load information, the engine heat pump alone operating state in which only the engine heat pump is operated, the motor heat pump alone operating state in which only the motor heat pump is operated, and the parallel operation state in which both the engine heat pump and the motor heat pump are operated. Control means for selecting and executing one of them is provided. According to the characteristic configuration described in claim 1, when the heating load information is information corresponding to a case where the engine heat pump can be operated to operate only on the heating load and an advantage unique to the engine heat pump can be exhibited. Is
If the engine heat pump alone operation state is executed and the heating load information is information that corresponds to the heating load by operating only the motor heat pump and that can exhibit the advantages unique to the motor heat pump, the motor In the case where the heat pump independent operation state is executed and the heating load information can show at least one of the advantages unique to the engine heat pump and the advantages unique to the motor heat pump in a state where both the engine heat pump and the motor heat pump are operated. When the information is, the parallel operation state is executed. Therefore, it has become possible to provide an air conditioner having both advantages unique to an engine heat pump and advantages unique to a motor heat pump.

According to a second aspect of the present invention, when the heating load information is larger than a set load, the control means sets the engine heat pump to a maximum according to the heating load information. The present invention is configured to execute the parallel operation state in a state where the output of the motor heat pump is adjusted while operating at the output or substantially the maximum output. According to the characteristic configuration of claim 2, when the heating load information is larger than the set load, the output of the motor heat pump is controlled while operating the engine heat pump at the maximum output or substantially the maximum output according to the heating load information. In the adjusting state, the parallel operation state is executed. Incidentally, the set load is set to a value equal to or larger than a heating load value corresponding to the maximum output of the engine heat pump. Therefore, when the heating load is so large that the operation of the engine heat pump alone cannot cope with the heating load, the parallel operation state is executed in a state where the output of the motor heat pump is adjusted while the engine heat pump is operated at the maximum output or almost the maximum output. The advantage unique to engine heat pumps is that high efficiency can be obtained by operating continuously at high output, and the advantage unique to motor heat pumps that the output can be adjusted according to the heating load while maintaining high efficiency. Both can now be demonstrated.

The invention according to claim 3 is characterized in that the exhaust heat of the engine is recovered, the refrigerant flowing through the engine heat pump by the recovered exhaust heat, and the motor heat pump. Exhaust heat recovery means for heating the refrigerant flowing through the refrigerant flow path from the evaporator to the compressor in each heat pump is provided. According to the characteristic configuration of claim 3, the exhaust heat recovery means recovers the exhaust heat of the engine, and the recovered exhaust heat recovers the refrigerant flowing through the engine heat pump and the refrigerant flowing through the motor heat pump. Is heated in the refrigerant flow path from the evaporator to the compressor in each heat pump. Therefore, when operating the engine heat pump, not only the engine heat pump,
Also in the motor heat pump, the exhaust heat of the engine can be used for heating, so that the efficiency can be further increased in either the operating state of the engine heat pump alone or the parallel operating state.

[0008] According to a fourth aspect of the present invention, the control unit is configured to control the engine heat pump when the heating load information is equal to or less than a set load and the outside air temperature is equal to or less than the set temperature. The present invention is configured to execute the islanding operation state. According to the characteristic configuration of the fourth aspect, when the heating load information is equal to or less than the set load and the outside air temperature is equal to or less than the set temperature, it is possible to cope with the heating load by operating only the engine heat pump. Temperature
When the efficiency of the motor heat pump decreases or the heating capacity decreases, the engine heat pump alone operation state is executed. The set load is set, for example, to a value equal to or less than a heating load corresponding to the maximum output of the engine heat pump. Further, the set temperature is set to a temperature lower than a temperature at which, for example, in a motor heat pump, the efficiency is lowered or the heating capacity is lowered. Usually, in each heat pump, outside air is passed through the evaporator as heat exchange air, so that the outside air temperature can be regarded as the temperature of the heat exchange air passing through the evaporator. Therefore, since the exhaust heat of the engine is recovered and the recovered exhaust heat is used for heating, the engine heat pump alone operation state may be executed while adjusting the output of the engine heat pump according to the fluctuation of the heating load information. The efficiency and the heating capacity can be increased as compared with a conventional air conditioner provided only with a motor heat pump. In other words, even when the outside air temperature is low, it is possible to exhibit the advantage unique to the engine heat pump that a high heating capacity can be obtained while maintaining high efficiency. Further, in this case, when the engine heat pump alone operation state is continuously executed at a high output, in addition to the advantage that a high heating capacity can be obtained while maintaining a high efficiency when the outside air temperature is low, a high output power can be obtained. In addition, the advantage of the engine heat pump that high efficiency can be obtained by continuously operating the engine heat pump can be exhibited.

[0009] According to a fifth aspect of the present invention, the control means is arranged such that, when the heating load information is equal to or less than the set load and the outside air temperature is higher than the set temperature. The motor heat pump is configured to execute the single operation state. According to the characteristic configuration of claim 5, the heating load information is equal to or less than the set load, and the outside air temperature is higher than the set temperature.
By operating only the motor heat pump, it is possible to cope with the heating load.In addition, when the outside temperature reaches such a level that the motor heat pump can prevent the efficiency and the heating capacity from decreasing, the output is adjusted in response to the fluctuation of the heating load information. While adjusting, the motor heat pump alone operation state is executed. Therefore, the heating load is small and the outside air temperature is
When the temperature of the motor heat pump rises to a level that can prevent the efficiency and the heating capacity from being reduced, the motor heat pump can be operated according to the heating load while maintaining high efficiency by executing the single operation state. That is to say, the advantages unique to motor heat pumps can now be demonstrated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the air conditioner includes an indoor unit Ui provided on a wall surface or the like in the room, an outdoor unit Uo provided outside the room, a remote control operation unit C for transmitting various control commands of the air conditioner, and the like. is there.

In the present invention, an engine heat pump He in which the compressor 1e is driven by the gas engine 8 and a motor heat pump Hm in which the compressor 1m is driven by the electric motor 9 are provided. And the motor heat pump Hm are arranged over the indoor unit Ui and the outdoor unit Uo.

The engine heat pump He includes a compressor 1e
In addition, by switching the refrigerant flow direction, the indoor heat exchanger 2e that functions as an evaporator during the cooling operation and as a condenser during the heating operation, and the indoor heat exchanger 2e during the cooling operation and the heating operation, respectively. Are the outdoor heat exchanger 3e, expansion valve 4e, accumulator 5e and four-way valve 6
e, the compressor 1e, the four-way valve 6e, the outdoor heat exchanger 3e, the expansion valve 4e, the indoor heat exchanger 2e, and the accumulator 5e so as to circulate the refrigerant in a predetermined path in the engine heat pump He. It is connected by a pipe 7e. The gas engine 8 is connected to a fuel supply passage 25 for supplying gaseous fuel such as city gas. The fuel supply passage 25 has an on-off valve 26 for intermittently supplying fuel to the gas engine 8, and a gas engine 8. A proportional valve 27 for adjusting the amount of fuel supplied to the engine is interposed. Engine heat pump H
The output of e is adjusted by the proportional valve 27 by the gas engine 8.
This is done by adjusting the amount of fuel supplied to the system.

The motor heat pump Hm is a compressor 1 m
In addition, by switching the refrigerant flow direction, the indoor heat exchanger 2m that functions as an evaporator during the cooling operation and as a condenser during the heating operation, and the indoor heat exchanger 2m during the cooling operation and the heating operation, respectively. Is the outdoor heat exchanger 3m, expansion valve 4m, accumulator 5m and four-way valve 6
m, the compressor 1 m, the four-way valve 6 m, the outdoor heat exchanger 3 m, the expansion valve 4 m, the indoor heat exchanger 2 m, and the accumulator 5 m so that the refrigerant circulates in a predetermined path in the motor heat pump Hm. It is connected by 7 m of piping. The electric motor 9 is configured to adjust the rotation speed by inverter control, and the output of the motor heat pump Hm is adjusted by adjusting the rotation speed of the electric motor 9 by inverter control.

The indoor unit Ui includes an engine heat pump H
e, the indoor heat exchanger 2e of the motor heat pump Hm, and the indoor heat exchanger 2m of the motor heat pump Hm. The air is sucked in from the room as the air-conditioning target area, passed through the indoor heat exchangers 2e and 2m, and sent out to the room. An indoor blower 10 for ventilating action,
In the ventilation path of the indoor blower 10, a room temperature sensor 11 arranged on the ventilation path upstream of the indoor heat exchangers 2e and 2m, and a control unit 12 for controlling various controls of the air conditioner.
Etc. are provided.

The outdoor unit Uo includes an engine heat pump H
e, gas engine 8, compressor 1e, four-way valve 6
e, outdoor heat exchanger 3e, expansion valve 4e and accumulator 5e, electric motor 9 constituting motor heat pump Hm, compressor 1m, four-way valve 6m, outdoor heat exchanger 3m,
An outdoor blower 13 that ventilates outside air to the expansion valve 4m, the accumulator 5m, and the outdoor heat exchangers 3e and 3m;
An outside air temperature sensor 14 for detecting an outside air temperature, and a refrigerant flowing through the engine heat pump He by recovering exhaust heat of the gas engine 8 during the heating operation, and
The refrigerant flowing through the motor heat pump Hm is used as an outdoor heat exchanger 3 that functions as an evaporator in each heat pump.
An exhaust heat recovery unit R is provided as an exhaust heat recovery unit that heats in a refrigerant flow path from e, 3m to the compressors 1e, 1m.

The exhaust heat recovery unit R includes an exhaust gas heat exchanger 15 for recovering heat from the exhaust gas of the gas engine 8 into cooling water, an engine jacket 16 for cooling the gas engine by flowing cooling water, and an engine heat pump He. A heat exchanger 17e for an engine heat pump that heats the refrigerant flowing therethrough with heat exchange with cooling water, and a heat exchanger 17m for a motor heat pump that heats the refrigerant flowing through the motor heat pump Hm with heat exchange with the cooling water. To the cooling water circulation path 1 for exhaust heat recovery so as to circulate the cooling water through a predetermined circulation path.
8 and a cooling water pump 19 interposed in a cooling water circulation passage 18 for exhaust heat recovery.

The predetermined circulation path of the cooling water is such that the cooling water passes through the exhaust gas heat exchanger 15 and the engine jacket 16 and then diverges, and is divided into an engine heat pump heat exchanger 17e and a motor heat pump heat pump. Exchanger 17
m, and after passing therethrough, a circulation path is set back to the exhaust gas heat exchanger 15. The engine heat pump heat exchanger 17e includes a refrigerant flowing through a refrigerant pipe 7e that guides the refrigerant from the outdoor heat exchanger 3e functioning as an evaporator to the accumulator 5e during a heating operation, and a cooling water circulation path for exhaust heat recovery. The heat exchanger 18 is provided so as to exchange heat with cooling water flowing therethrough. Further, the heat exchanger 17m for the motor heat pump, during the heating operation, the refrigerant flowing through the refrigerant pipe 7m that guides the refrigerant from the outdoor heat exchanger 3m functioning as an evaporator to the accumulator 5m, and cooling for exhaust heat recovery. The cooling water flowing through the water circulation path 18 is provided to exchange heat.

Further, during the cooling operation, the cooling water is bypassed to the heat exchanger 17e for the engine heat pump and the heat exchanger 17m for the motor heat pump, so that the heat exchanger for exhaust gas 1
5. The cooling water passage 21 provided with the radiator 20 is passed through the three-way valve 22 to the cooling water circulation passage 18 for exhaust heat recovery so that the engine jacket 16 and the radiator 20 are circulated in the circulation path. Connected. The radiator 20 includes
The air is blown by the outdoor blower 13 to cool the cooling water.

When the temperature of the cooling water is equal to or lower than the set temperature for radiation start (for example, 60 ° C.), such as at the time of starting,
The cooling water bypasses the heat exchanger 17e for the engine heat pump, the heat exchanger 17m for the motor heat pump, and the radiator 20, and is circulated through the exhaust gas heat exchanger 15 and the engine jacket 16 in a circulation path that flows sequentially. The bypass flow path 23 is connected to the exhaust heat recovery cooling water circulation path 18 via a thermostat type temperature control valve 24. The temperature control valve 24 switches the flow path so that the cooling water flows to the side of the bypass flow path 23 while the temperature of the cooling water is equal to or lower than the set temperature for radiation start, and the temperature of the cooling water decreases When the temperature becomes higher than the set temperature, the flow path is switched so that the cooling water flows to the exhaust heat recovery cooling water circulation path 18 side.

The air conditioner according to the present invention is configured so that a heating operation and a cooling operation can be selectively switched. FIG.
The flow of the refrigerant in each of the engine heat pump He and the motor heat pump Hm and the flow of the cooling water for cooling the gas engine 8 during the heating operation will be described based on FIG. In FIG. 1, the flow of the refrigerant is indicated by solid arrows, and the flow of cooling water is indicated by broken arrows. First, the flow of the refrigerant in the engine heat pump He will be described. In the four-way valve 6e, the high-pressure gas-phase refrigerant discharged from the compressor 1e is sent to the indoor heat exchanger 2e, and the low-pressure gas-phase refrigerant sent from the outdoor heat exchanger 3e is sent to the accumulator 5e. Switch to the channel to be set. Therefore, the indoor heat exchanger 2e acts as a condenser, and in the indoor heat exchanger 2e, the four-way valve 6
The high-pressure gas-phase refrigerant delivered through e is condensed by heat exchange with the ventilation air by the indoor blower 10. The liquid-phase refrigerant sent out from the indoor heat exchanger 2e is supplied to the outdoor heat exchanger 3e via the expansion valve 4e, and in the outdoor heat exchanger 3e, heat exchange with the ventilation air by the outdoor blower 13 is performed. And the low-pressure gas-phase refrigerant is evaporated by the four-way valve 6.
After passing through e, it is completely evaporated by heating by the heat exchanger for engine heat pump 17e, and returns to the compressor 1e via the accumulator 5e. Accordingly, the air supplied into the room by the indoor blower 10 is heated by the indoor heat exchanger 2e, so that the room is heated.

Since the flow of the refrigerant in the motor heat pump Hm is the same as the flow of the refrigerant in the engine heat pump He, detailed description is omitted, but also in the motor heat pump Hm, the low-pressure air evaporated in the outdoor heat exchanger 3m. After passing through the four-way valve 6m, the phase refrigerant completely evaporates due to heating by the heat exchanger 17m for the motor heat pump, and the compressor 1m passes through the accumulator 5m.
Return to

As described above, during the heating operation, the engine heat pump He and the motor heat pump Hm
In any case, the efficiency is increased because the refrigerant is heated by the cooling water of the gas engine 8 in the refrigerant flow path from the outdoor heat exchangers 3e, 3m functioning as evaporators to the compressors 1e, 1m. be able to.

Next, the gas engine 8 during the heating operation
The flow of cooling water for cooling will be described. Three-way valve 22
The cooling water flows through the heat exchanger 17e for the engine heat pump and the heat exchanger 17m for the motor heat pump.
Switch to the flow direction. Therefore, the cooling water is supplied to the exhaust gas heat exchanger 15, the engine jacket 16 and the three-way valve 2.
2 are sequentially passed and then split, and the heat exchanger 17e for the engine heat pump and the heat exchanger 1 for the motor heat pump are separated.
After passing through them, they circulate in a circulation path returning to the exhaust gas heat exchanger 15. Then, the exhaust heat of the gas engine 8 collected in the exhaust gas heat exchanger 15 and the engine jacket 16 is given to the refrigerant via the cooling water in the engine heat pump heat exchanger 17e and the motor heat pump heat exchanger 17m. It is.

The flow of the refrigerant in the engine heat pump He and the motor heat pump Hm and the flow of the cooling water for cooling the gas engine 8 during the cooling operation will be described with reference to FIG. In FIG. 2, the flow of the refrigerant is indicated by solid arrows, and the flow of the cooling water is indicated by broken arrows. Since the flow of the refrigerant is the same in each of the engine heat pump He and the motor heat pump Hm, the flow of the refrigerant will be described below for the engine heat pump He, and the detailed description will be made for the motor heat pump Hm. Description is omitted. The four-way valve 6e is connected to the compressor 1e
Is discharged to the outdoor heat exchanger 3e, and the low-pressure gas-phase refrigerant discharged from the indoor heat exchanger 2e is switched to a flow path to be discharged to the accumulator 5e. Accordingly, the high-pressure gas-phase refrigerant discharged from the compressor 1e is supplied to the outdoor heat exchanger 3e acting as a condenser via the four-way valve 6e, and the outdoor heat exchanger 3e
In e, the air is condensed by heat exchange with the ventilation air by the outdoor blower 13. The liquid-phase refrigerant sent from the outdoor heat exchanger 3e is supplied to the indoor heat exchanger 2e via the expansion valve 4e, and the indoor heat exchanger 2e
Evaporates by heat exchange with the ventilation air. Therefore, the ventilation air from the indoor blower 10 is cooled and dehumidified, so that the room is cooled. The low-pressure gas-phase refrigerant sent from the indoor heat exchanger 2e returns to the compressor 1e via the four-way valve 6e and the accumulator 5e.

Next, the gas engine 8 during the cooling operation
The flow of cooling water for cooling will be described. Three-way valve 22
Is switched to the direction in which the cooling water flows to the radiator 20. Accordingly, the cooling water passes through the exhaust gas heat exchanger 15, the engine jacket 16, and the three-way valve 22 in that order, then flows through the radiator 20, and circulates in a circulation path returning to the exhaust gas heat exchanger 15. And the cooling water is radiator 2
While the air is flowing through the air, the air is cooled by the ventilation air from the outdoor blower 13.

Although not shown, the remote controller C has an operation switch for switching between a cooling operation and a heating operation, a temperature setting switch for setting an air-conditioning target temperature, and the like.

Next, the control operation of the control unit 12 will be described. When the heating operation is instructed from the remote control operation unit C, the control unit 12 controls the indoor blower 10 and the outdoor blower 13
To operate the engine heat pump He and the motor heat pump Hm in the heating operation state as described above.
Further, in the heating operation state, the control unit 12 controls the air-conditioning load information obtained based on a deviation between the air-conditioning target temperature set by the remote control operation unit C and the temperature detected by the room temperature sensor 11. O) corresponding to the heating load information in the description).
Only the engine heat pump operating mode (corresponding to the engine heat pump alone operating state), only the motor heat pump Hm operating only the motor heat pump Hm (corresponding to the motor heat pump alone operating state), and the engine heat pump He and the motor One of the parallel operation modes (corresponding to the parallel operation state) in which both the heat pumps Hm are operated is selected and executed. When the engine heat pump He is operated, the cooling water pump 19 is operated and the three-way valve 2 is operated.
2 and the cooling water is the heat exchanger 17e for the engine heat pump.
Then, the flow direction is switched to the flow direction of the heat exchanger 17m for the motor heat pump.

When a cooling operation is instructed from the remote control operating section C, the indoor blower 10 and the outdoor blower 13 are operated, and the engine heat pump He and the motor heat pump Hm are operated in the above-described cooling operation state. And
In the cooling operation state, based on the air conditioning load information O,
One of the motor heat pump independent operation mode and the parallel operation mode is selected and executed. When the engine heat pump He is operated, the cooling water pump 19 is operated, the three-way valve 22 is operated, and the cooling water is supplied to the radiator. 20
To the direction of flow.

The operation mode switching control by the control unit 12 will be described below. In both the heating operation and the cooling operation, when the operation start is commanded,
First, the engine heat pump He and the motor heat pump Hm are each operated in the maximum output state to start the operation, and based on the deviation between the air conditioning target temperature set by the remote control operation unit C and the temperature detected by the room temperature sensor 11. Then, the air-conditioning load information O is obtained, an operation mode corresponding to the obtained air-conditioning load information O is executed, and thereafter, the operation mode is switched based on the obtained air-conditioning load information O while obtaining the air-conditioning load information O.

As information for switching the operation mode, a first set load So1 (corresponding to a set load in claims) and the first set load So
A second set load So2 greater than 1; a first set switch temperature St1 (corresponding to a set temperature in the claims); and a second set switch higher than the first set switch temperature St1. The temperature St2 is set in advance and stored in the control unit 12. In the present embodiment, the first set load So1 is set to 4 kW, which is the maximum output of the engine heat pump He, for an air conditioner in which the maximum output of the engine heat pump He and the maximum output of the motor heat pump Hm are the same, each being 4 kW. The second set load So2 is set to a value larger than 4 kW and smaller than 8 kW, which is the sum of the maximum outputs of the engine heat pump He and the motor heat pump Hm. The first switching set temperature St1 is set to 5 ° C.

The operation mode switching control during the heating operation will be described below with reference to FIG. Control unit 12
Is the air-conditioning target temperature set by the remote control operation unit C,
Based on the air conditioning load information (corresponding to the heating load information in the claims) O obtained based on the deviation from the detected temperature of the room temperature sensor 11 and the outside air temperature T detected by the outside air temperature sensor 14 Switch the operation mode. When the air-conditioning load information O is equal to or less than the first set load So1 and the outside air temperature T is equal to or less than the first switch set temperature St1, the engine heat pump single operation mode is executed. During the execution of the engine heat pump single operation mode, the output of the engine heat pump He is adjusted according to the air conditioning load information O. Basically, the proportional valve 26 allows the gas engine 8
The output is adjusted by adjusting the amount of fuel supplied to the air conditioner. However, if the air conditioning load information O becomes too small to be adjusted by the proportional valve 27, the gas engine 8 is operated and stopped by opening and closing the on-off valve 26. The on / off control is repeated.

When the air-conditioning load information O is equal to or less than the first set load So1 and the outside air temperature T is higher than the first switching set temperature St1, the motor heat pump single operation mode is executed. During the execution of the motor heat pump single operation mode, the output of the motor heat pump Hm is adjusted by adjusting the rotation speed of the electric motor 9 by inverter control according to the air conditioning load information O.

The air conditioning load information O is larger than the first set load So1, and the outside air temperature T is equal to the second set temperature St2 for switching.
In the following cases, and when the air conditioning load information O is the first set load So
1 and the second set load So2, and the outside air temperature T
When the temperature is higher than the switching set temperature St2, the parallel operation mode in the engine heat pump maximum output state in which the output of the motor heat pump Hm is adjusted while operating the engine heat pump He at the maximum output according to the air conditioning load information O. Execute.

The air-conditioning load information O is larger than the second set load So2, and the outside air temperature T is equal to the second set switch temperature St2.
If it is higher than the above, the parallel operation mode in the motor heat pump maximum output state is executed in which the output of the engine heat pump He is adjusted while operating the motor heat pump Hm at the maximum output according to the air conditioning load information O. That is, when the outside air temperature O becomes higher than the predetermined temperature, the efficiency of the motor heat pump Hm becomes higher than the efficiency of the engine heat pump He. Therefore, when the outside air temperature O is equal to or higher than the predetermined temperature, the air conditioning load is reduced by the motor heat pump Hm.
Heat pump He while operating at maximum output.
Is adjusted to a narrow range close to the maximum output (a range that can be accommodated by adjusting the proportional valve 27), and is large enough to cope with the air-conditioning load. It can be higher. Therefore, the second switching set temperature St
2 is set to the predetermined temperature, and the second set load So2 is adjusted in a narrow range close to the maximum output (a range that can be dealt with by adjusting the proportional valve 27) while the motor heat pump Hm is operated at the maximum output. The air-conditioning load is set to a value that can be handled.

Next, switching control of the operation mode during the cooling operation will be described. When the air-conditioning load information O is equal to or smaller than the first set load So1, the control unit 12 executes the motor heat pump single operation mode while adjusting the output of the motor heat pump Hm according to the air-conditioning load information O. When the air-conditioning load information O is larger than the first set load So1, the parallel operation mode in the engine heat pump maximum output state in which the output of the motor heat pump Hm is adjusted while operating the engine heat pump He at the maximum output is executed. I do.

[Another Embodiment] Next, another embodiment will be described. (B) In the above embodiment, when the air conditioning load information O is larger than the second set load So2 and the outside air temperature T is higher than the second switching set temperature St2, the motor heat pump is in the maximum output state. Although the case where the parallel operation mode is executed has been exemplified, when the execution of the parallel operation mode in the motor heat pump maximum output state is omitted and the air-conditioning load information O is larger than the first set load So1, regardless of the outside air temperature T, Instead, it may be configured to execute the parallel operation mode in the engine heat pump maximum output state.

(B) In the above embodiment, the case where the operation mode is switched based on the air conditioning load information O and the outside air temperature T in the heating operation has been described.
The operation mode may be switched based only on the air conditioning load information O. In this case, for example, when the air conditioning load information O is larger than the first set load So1, the parallel operation mode in the engine heat pump maximum output state is executed, and when the air conditioning load information O is equal to or less than the first set load So1, , One of the engine heat pump single operation mode and the motor heat pump single operation mode is executed.

(C) In the above embodiment, the exhaust heat of the gas engine 8 is recovered, and the recovered exhaust heat allows the refrigerant flowing through the engine heat pump He and the refrigerant flowing through the motor heat pump Hm to be recovered. Although the case where the exhaust heat recovery unit R for heating in the refrigerant flow path from the outdoor heat exchangers 3e, 3m functioning as the evaporator to the compressors 1e, 1m functioning as the evaporator in each heat pump is illustrated, the exhaust heat recovery unit R May be omitted, and the exhaust heat of the gas engine 8 may be used as a heat source for hot water supply. In this case, for example, when the air conditioning load information O is larger than the first set load So1, the parallel operation mode in the engine heat pump maximum output state is executed, and when the air conditioning load information O is equal to or less than the first set load So1, , One of the engine heat pump single operation mode and the motor heat pump single operation mode is executed.

(D) In the above embodiment, the case where the engine heat pump He and the motor heat pump Hm having the same maximum output are provided is illustrated, but the engine heat pump He and the motor heat pump Hm having different maximum outputs may be provided. (E) The first set load So1, the second set load So2, the first set switch temperature St1, and the second set switch temperature St2.
Each specific value can be set as appropriate according to the specifications of the air conditioner and the like.

(F) In the above embodiment, in the exhaust heat recovery section R, the heat exchanger 1 for the engine heat pump is used.
Although the case in which the heat exchanger 7e and the heat exchanger 17m for the motor heat pump are connected in parallel to the cooling water circulation path is illustrated, it may be connected in series to the cooling water circulation path.

(G) The heat exchanger 17e for the engine heat pump and the heat exchanger 17m for the motor heat pump are installed at the locations where the outdoor heat exchangers 3e, 3m functioning as evaporators in each heat pump during the heating operation are connected to the compressor 1e. , 1 m in the refrigerant flow path. In the above-described embodiment, the refrigerant flow path is located on the lower side in the refrigerant flow direction than the four-way valves 6 e, 6 m. It may be on the upstream side of the valves 6e and 6m in the refrigerant flow direction.

(H) In the above embodiment, the compressor 1e and the electric motor 9 driven by the gas engine 8
For each of the compressors 1m driven by, an example in which a heat pump circuit including an indoor heat exchanger, a cold outdoor heat exchanger, an expansion valve, an accumulator, and a four-way valve is separately connected is illustrated. A compressor 1e driven by the gas engine 8 and a compressor 1m driven by the electric motor 9 are connected in parallel to the heat pump circuit, and one heat pump circuit is used by the engine heat pump He and the motor heat pump Hm. You may comprise.

(I) In the above embodiment, the present invention is applied to an air conditioner in which one outdoor unit Uo is connected to one indoor unit Ui. Multiple indoor units Ui for one outdoor unit Uo
Can also be applied to an air conditioner in which are connected in parallel.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an air conditioner according to an embodiment of the present invention and flows of a refrigerant and cooling water in a heating operation state.

FIG. 2 is a diagram showing flows of a refrigerant and cooling water in a cooling operation state in the air conditioner according to the embodiment of the present invention.

FIG. 3 is a diagram illustrating switching of operation modes.

[Explanation of symbols]

 1e, 1m Compressor 3e, 3m Evaporator 8 Engine 9 Electric motor 12 Control means He Engine heat pump Hm Motor heat pump R Exhaust heat recovery means

Claims (5)

[Claims] 1. An air conditioner that supplies air heated by a heat pump to an air-conditioning target area to heat the air-conditioning target area, wherein the heat pump is an engine heat pump in which a compressor is driven by an engine; A motor heat pump in which a heater is driven by an electric motor, based on heating load information of the air conditioning target area, an engine heat pump alone operating state in which only the engine heat pump is operated, and a motor heat pump in which only the motor heat pump is operated An air conditioner provided with control means for selecting and executing one of an independent operation state and a parallel operation state in which both the engine heat pump and the motor heat pump are operated. 2. When the heating load information is larger than a set load, the control means controls the output of the motor heat pump while operating the engine heat pump at a maximum output or a substantially maximum output according to the heating load information. The air conditioner according to claim 1, wherein the air conditioner is configured to execute the parallel operation state in an adjusting state. 3. A refrigerant flowing through the engine heat pump by recovering exhaust heat of the engine and recovering the exhaust heat.
The air conditioner according to claim 1 or 2, further comprising an exhaust heat recovery unit that heats the refrigerant flowing through the motor heat pump in a refrigerant flow path from an evaporator to a compressor in each heat pump. 4. The engine heat pump according to claim 3, wherein the control unit executes the engine heat pump alone operation state when the heating load information is equal to or less than the set load and the outside air temperature is equal to or less than the set temperature. Air conditioner. 5. The control unit is configured to execute the motor heat pump alone operation state when the heating load information is equal to or less than the set load and the outside air temperature is higher than the set temperature. Item 5. The air conditioner according to Item 4.