JP2009236441A - Heat pump type refrigerating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve efficiency of a heat pump cycle by improving performance of a supercooling unit. <P>SOLUTION: This heat pump type refrigerating device 1 includes a heat pump type air conditioner 2 constituted by successively connecting a compressor 13, an outdoor heat exchanger 17, a supercooling unit 40 and indoor heat exchangers 22A, 22B, 22C, and an absorption type refrigerating machine 50 constituted by connecting a radiating section 53 to the supercooling unit 40, and a heat source 60 for utilizing solar heat or industry waste heat is connected to a heat absorbing section 51 of the absorption type refrigerating machine 50. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heat pump refrigeration apparatus including a supercooler.

Conventionally, a heat pump refrigeration apparatus in which a compressor, a four-way valve, an outdoor heat exchanger, and an indoor heat exchanger are sequentially connected by a refrigerant pipe. In order to improve the coefficient of performance (COP) of the heat pump cycle, one having a supercooler for supercooling the refrigerant has been proposed. In this type, there is an ice heat storage system including a supercooler that cools the outlet refrigerant of the outdoor heat exchanger using the latent heat of ice (see, for example, Patent Document 1). According to this configuration, the cooling capacity can be increased by applying supercooling using the latent heat of ice. In this case, even if the power consumption for producing ice is included, the running cost of the entire system can be reduced by performing the supercooling operation with ice in the hot daytime.
Japanese Patent Laid-Open No. 2007-064505

However, further energy saving is demanded, and in order to improve the efficiency of the heat pump cycle, it is necessary to improve the performance of the supercooler.
Accordingly, an object of the present invention is to provide a heat pump refrigeration apparatus that improves the performance of the supercooler and improves the efficiency of the heat pump cycle.

In order to solve the above problems, a heat pump refrigeration apparatus of the present invention includes a heat pump air conditioner in which a compressor, an outdoor heat exchanger, a supercooler, and an indoor heat exchanger are connected in sequence, and a heat radiating unit to the supercooler. And a heat source using solar heat or factory waste heat is connected to the heat absorption part of the absorption refrigerator.
According to the above configuration, energy saving can be achieved by operating the absorption refrigerator using a heat source utilizing solar heat or factory waste heat during cooling operation, and cooling the refrigerant in the subcooler. Further, by using an absorption chiller capable of high-efficiency heat exchange for cooling in the supercooler, it is possible to efficiently supercool and improve the efficiency of the heat pump cycle.

The said structure WHEREIN: It is preferable that the said heat pump type air conditioner is equipped with the refrigerant | coolant heater, and connected the said heat source to this refrigerant | coolant heater.
According to the said structure, since the refrigerant | coolant heater using the heat source of solar heat utilization or factory waste heat utilization is provided, a heating capability can be increased at the time of heating operation, and the efficiency of a heat pump cycle can be improved.

In the above configuration, the compressor is preferably driven by a gas engine.
According to the above configuration, since the refrigeration capacity can be increased, the power of the gas engine that drives the compressor can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, at the time of air_conditionaing | cooling operation, an absorption refrigerating machine can be operated using the heat source of solar heat utilization or factory waste heat utilization, and a refrigerant | coolant can be cooled in a subcooler, and energy saving can be achieved. Further, by using an absorption chiller capable of high-efficiency heat exchange for cooling in the supercooler, it is possible to efficiently supercool and improve the efficiency of the heat pump cycle.

Next, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a refrigerant circuit of an air conditioner as an example of a heat pump refrigeration apparatus in the present embodiment.
The air conditioner 1 is a gas heat pump air conditioner, and includes a heat pump air conditioner 2 having an outdoor unit 10 and a plurality (three in the present embodiment) of indoor units 20A, 20B, and 20C. An absorption refrigerator 50 and a solar water heater (heat source) 60 are provided. The outdoor refrigerant pipe 11 connected to the outdoor unit 10 and the indoor refrigerant pipes 21A, 21B, and 21C connected to the indoor units 20A, 20B, and 20C are connected to form a part of the heat pump cycle 100. .

  Indoor units 20A, 20B, and 20C are installed indoors, and indoor heat exchangers 22A, 22B, and 22C are connected to indoor refrigerant pipes 21A, 21B, and 21C, respectively. In the vicinity of these indoor heat exchangers 22A, 22B, and 22C, indoor expansion valves 23A, 23B, and 23C as pressure reducing devices are respectively connected. Furthermore, indoor fans 24A, 24B, and 24C that blow air to the indoor heat exchangers 22A, 22B, and 22C are disposed adjacent to the indoor heat exchangers 22A, 22B, and 22C.

  The outdoor unit 10 is disposed outside, and a refrigerant heater 12 and a compressor (compressor) 13 are sequentially connected to an outdoor refrigerant pipe 11, and an accumulator 14 is provided on the suction side of the compressor 13 and an oil separator is provided on the discharge side. Four-way valves 16 are connected to each other via 15.

  An outdoor heat exchanger 17 is connected to the four-way valve 16 into which the refrigerant discharged from the compressor 13 flows. The outdoor heat exchanger 17 is adjacent to an outdoor fan 18 that allows the outdoor air to flow through the outdoor heat exchanger 17. Has been placed. An outdoor expansion valve 19 as a pressure reducing device is connected to the outdoor heat exchanger 17, and a supercooler 40 is connected in parallel with the outdoor expansion valve 19. The subcooler 40 is provided so that the cold water supplied from the absorption refrigerator 50 and the liquid refrigerant condensed in the outdoor heat exchanger 17 can exchange heat. A check valve 41 is connected to the pipe 40 </ b> A of the subcooler 40, and a check valve 42 is connected to the pipe 19 </ b> A of the outdoor expansion valve 19. By these two check valves 41 and 42, the refrigerant flows through the pipe 40A of the supercooler 40 as shown by the solid line arrow during the cooling operation, and the refrigerant does not flow through the pipe 40A of the subcooler 40 during the heating operation. As shown by the dotted arrow, the pipe 19A of the outdoor expansion valve 19 flows.

A bypass pipe 101 and a bypass valve 102 are connected between the refrigerant high-pressure side (discharge side of the compressor 13) and the refrigerant low-pressure side (in the illustrated example, before the accumulator 14). The outdoor refrigerant pipe 11 is provided with closing valves 103 and 104.
Furthermore, the controller 80 which controls the air conditioning apparatus 1 whole is provided. The controller 80 includes a timing unit (not shown) and an alarm device that generates an alarm when the air conditioner 1 is abnormal. Furthermore, the indoor units 20A, 20B, and 20C are provided with remote controllers 81A, 81B, and 81C that are switched ON / OFF.

  The compressor 13 is connected to the gas engine 30 via a power transmission belt (not shown) and is driven by the gas engine 30. The gas engine 30 is cooled by cooling water flowing through the engine cooling system 31. In the engine cooling system 31, a gas engine 30, a radiator 37 provided adjacent to the outdoor heat exchanger 17, a reserve tank 39, and a cooling water pump 34 are connected to a first cooling system pipe 35. A cooling water bypass valve 38 is provided between the gas engine 30 and the radiator 37, and the cooling water bypass valve 38 is connected to the inflow side of the cooling water pump 34.

The absorption refrigerator 50 includes four heat exchangers, a regenerator (heat absorption part) 51, a condenser 52, an evaporator (heat radiation part) 53, and an absorber 54, for example, water as a refrigerant and bromide as an absorption liquid. This is a single-effect absorption refrigerator using a lithium (LiBr) solution. The absorption refrigerator 50 is provided with an alarm device (not shown) that generates an alarm when the absorption refrigerator 50 is abnormal. The absorption refrigerator 50 is connected to the supercooler 40 of the heat pump air conditioner 2 via the supercooling water pipe 55 and can supercool the refrigerant flowing through the supercooler 40. The supercooling water pipe 55 is provided with a water supply pump P3.
A cooling tower 57 is connected to the condenser 52 of the absorption chiller 50 via a cooling water pipe 56, and the cooling tower 57 supplies cooling water to the condenser 52 to cool the refrigerant flowing through the condenser 52. it can. The cooling water pipe 56 is provided with a cooling water pump P5. A water supply pipe 58 and a drain pipe 59 are connected to the cooling tower 57.

The solar water heater 60 is connected to the regenerator 51 of the absorption chiller 50 through the hot water supply pipe 61, and can give the heat of the solar water heater 60 to the regenerator 51. The hot water supply pipe 61 is provided with on-off valves 61A and 61B, a hot water supply pump P2, and a temperature sensor 62. The solar water heater 60 includes a hot water storage tank 63 for storing water, and a water supply pipe 64 and a drain pipe 65 are connected to the hot water storage tank 63. The water supply pipe 64 is provided with a water supply valve SV, and this water supply valve SV is configured so that an elapsed time t from when the water supply valve SV is opened is measured by the controller 80.
The hot water storage tank 63 is provided with a liquid level switch 66 and a temperature sensor 67. The liquid level switch 66 is a switch that is switched ON / OFF, and is turned ON when the water level of the hot water storage tank 63 becomes equal to or higher than a predetermined water level.

A heat radiator 69 is connected to the hot water storage tank 63 via a heat radiating pipe 68, and the heat radiator 69 cools hot water from the hot water storage tank 63. The heat radiating pipe 68 is provided with a heat radiating pump P4. Further, a solar heat collector 70 is connected to the hot water storage tank 63 via a heat collecting pipe 71. The heat collection pipe 71 is provided with a heat collection pump P1. The solar heat collector 70 is provided with a solar radiation sensor 72. The solar radiation sensor 72 is a switch that switches to ON / OFF, and is turned on when sunlight is detected.
Further, the solar water heater 60 is connected to the refrigerant heater 12 of the heat pump type air conditioner 2 through the hot water supply pipe 74 and can heat the refrigerant flowing through the refrigerant heater 12.

Next, the operation of the air conditioner 1 will be described.
The air conditioning apparatus 1 according to the present embodiment uses only the heat pump air conditioner 2 as a cooling operation or a heating operation without using the absorption chiller 50 and the solar water heater 60 as the operation mode of the cooling operation or the heating operation. And a hybrid mode in which the heat pump air conditioner 2 uses only the absorption chiller 50 and the solar water heater 60 or the solar water heater 60 for cooling operation or heating operation.

  When the air conditioner 1 is turned on, when the sun is coming out, the heat collection pump P1 is driven, and the water stored in the hot water storage tank 63 is circulated to the solar heat collector 70, and is heated by the solar heat. Heated to warm water. The hot water heated by the solar heat collector 70 returns to the hot water storage tank 63. As described above, the hot water circulates through the heat collecting pipe 71, whereby the temperature of the hot water stored in the hot water tank 63 (hereinafter referred to as the hot water tank temperature) T1 rises. Whether or not the sun is coming out is detected by the solar radiation sensor 72. The hot water tank temperature T1 is detected by a temperature sensor 67, and the speed of the heat collecting pump P1 is controlled in proportion to the hot water tank temperature T1.

When at least one of the remote controllers 81A, 81B, 81C is turned ON by a user operation, the operation of the heat pump air conditioner 2 is started. In addition, when the sun has not come out, only the heat pump type air conditioner 2 starts the cooling operation or the heating operation in the normal mode. Here, description will be given below assuming that the operation mode is the hybrid mode.
When the hot water supply pump P2 is driven, when the air conditioner 1 is in the heating operation state, the on-off valve 61A is closed and the on-off valve 61B is opened, and hot water of 30 to 95 ° C. is supplied from the hot water storage tank 63 to the refrigerant heater. 12 is supplied. When the air conditioner 1 is in the cooling operation state, the on-off valve 61A is opened and the on-off valve 61B is closed, and hot water of 70 to 95 ° C. is supplied from the hot water storage tank 63 to the regenerator 51 of the absorption refrigerator 50. The By switching the opening and closing of the on-off valves 61A and 61B, the speed of the hot water supply pump P2 is switched. The temperature of the supplied hot water (hereinafter referred to as hot water temperature) T2 is detected by the temperature sensor 62.

When the air conditioner 1 is in the cooling operation state, the cooling water pump P5 is driven, and the cooling water cooled by the cooling tower 57 is supplied from the cooling tower 57 to the condenser 52 of the absorption chiller 50. Then, when the controller 80 turns on the operation signal of the absorption chiller 50, the operation of the absorption chiller 50 is started.
The absorption refrigeration machine 50 that has started operation uses the hot water supplied from the hot water storage tank 63 to heat the refrigerant of the absorption refrigeration machine 50 with the regenerator 51 and separates it into concentrated absorption liquid and refrigerant vapor. This refrigerant vapor is cooled by the condenser 52 by the cooling water supplied from the cooling tower 57 and becomes a liquid refrigerant. This liquid refrigerant is vaporized by the evaporator 53 to become refrigerant vapor. At this time, the refrigerant takes heat of the water flowing through the evaporator 53 by the heat of vaporization, and the water is cooled to become cold water. The refrigerant vapor is absorbed by the absorption liquid in the absorber 54, and the absorption liquid having a reduced concentration returns to the regenerator 51. The cold water cooled by the absorption chiller 50 is supplied to the supercooler 40 by the water supply pump P3. The feed water pump P3 is configured such that the frequency of the speed control is controlled according to the number of operating indoor units 20A, 20B, and 20C.

The hot water supply pump P2 can be driven independently, but the water supply pump P3 and the cooling water pump P5 are not in a case where the hot water supply pump P2 is being driven and the water supply pump P3 and the cooling water pump P5 are simultaneously driven. Interlock is applied to prevent operation.
Further, in the absorption chiller 50, when the controller 80 turns off the operation signal of the absorption chiller 50, stop control of the absorption chiller 50 is started, and the hot water supply pump P2 and the water supply pump P3 are connected. Stopped.

Next, an outline operation during the cooling operation and the heating operation of the air conditioner 1 will be described.
The air conditioner 1 is set to a cooling operation or a heating operation by switching the four-way valve 16 with a manual switch (not shown). That is, when the four-way valve 16 is switched to the cooling side, the refrigerant flows as indicated by the solid line arrow α, the outdoor heat exchanger 17 becomes a condenser, and the indoor heat exchangers 22A, 22B, and 22C become evaporators. It becomes a cooling operation state. Thereby, each indoor heat exchanger 22A, 22B, 22C cools a room.

  Specifically, the gas refrigerant compressed by the compressor 13 flows into the outdoor heat exchanger 17. The gas refrigerant that has flowed into the outdoor heat exchanger 17 is cooled by exchanging heat with the outside air in the outdoor heat exchanger 17 and becomes liquid refrigerant. Since the liquid refrigerant flowing out of the outdoor heat exchanger 17 has the reverse support valve 42, the entire amount flows through the subcooler 40 regardless of the degree of opening of the outdoor expansion valve 19, and flows into the indoor units 20A, 20B, and 20C. . At this time, cold water generated by the absorption refrigerator 50 is guided to the supercooler 40. Thereby, the liquid refrigerant which distribute | circulates the supercooler 40 will be in a supercooled state by heat-exchanging with the supplied cold water.

  During the cooling operation, the opening degrees of the indoor expansion valves 23A, 23B, and 23C are adjusted according to the air conditioning load, and the outdoor expansion valve 19 is operated to be fully opened. Thereby, the liquid refrigerant cooled by the supercooler 40 and flowing into the indoor units 20A, 20B, 20C is expanded by the indoor expansion valves 23A, 23B, 23C. The liquid refrigerant expanded by the indoor expansion valves 23A, 23B, and 23C exchanges heat with indoor air in the indoor heat exchangers 22A, 22B, and 22C to cool the room and evaporate to become a gas refrigerant. The gas refrigerant flowing out from the indoor heat exchangers 22A, 22B, and 22C flows through the four-way valve 16, is separated into gas and liquid by the accumulator 14, and is sucked into the compressor 13.

On the other hand, when the four-way valve 16 is switched to the heating side, the refrigerant flows as indicated by the broken arrow β, the indoor heat exchangers 22A, 22B, and 22C become condensers, and the outdoor heat exchanger 17 becomes an evaporator. It becomes a heating operation state. Thereby, each indoor heat exchanger 22A, 22B, 22C heats a room.
Specifically, the gas refrigerant compressed by the compressor 13 flows into the indoor heat exchangers 22A, 22B, and 22C. The gas refrigerant that has flowed into the indoor heat exchangers 22A, 22B, and 22C exchanges heat with the indoor air in the indoor heat exchangers 22A, 22B, and 22C to heat the room, and condenses into a liquid refrigerant.

  The liquid refrigerant that has flowed out of the indoor heat exchangers 22A, 22B, and 22C circulates through the indoor expansion valves 23A, 23B, and 23C and the outdoor expansion valve 19 to become a refrigerant in which steam and liquid are mixed, and the outdoor heat exchanger 17 Flow into. In the heating operation, the respective valve openings of the outdoor expansion valve 19 and the indoor expansion valves 23A, 23B, and 23C are adjusted according to the air conditioning load.

  The refrigerant that has flowed into the outdoor heat exchanger 17 becomes a gas refrigerant by evaporating by exchanging heat with the outside air in the outdoor heat exchanger 17, but in a state where a part of the liquid refrigerant is also mixed, the four-way valve 16 and the refrigerant heater 12 is distributed. At this time, the hot water supplied from the solar water heater 60 is guided to the refrigerant heater 12. Thereby, the refrigerant | coolant which distribute | circulated the refrigerant | coolant heater 12 is heat-exchanged with the supplied hot water, and is heated. The refrigerant completely evaporated by being heated by the refrigerant heater 12 is decomposed into gas and liquid by the accumulator 14 and sucked into the compressor 13.

FIG. 2 is a process flowchart showing operation control from power-on to stop of the air conditioner 1.
When the air conditioner 1 is powered on, the controller 80 determines whether or not the operation of the air conditioner 1 is a cooling operation (step S1). When the operation of the air conditioner 1 is the cooling operation (step S1: Y), the controller 80 determines whether or not the liquid level switch 66 is ON (step S2). When the liquid level switch 66 is ON (step S2: Y), the controller 80 determines whether or not the solar radiation sensor 72 is ON (step S3). When the solar radiation sensor 72 is ON (step S3: Y), the controller 80 drives the heat collection pump P1 (step S4) and controls the heat collection pump P1 (step S5).

  Next, it is determined whether or not the hot water tank temperature T1 detected by the temperature sensor 67 is higher than 60 ° C. (step S6). When the hot water storage tank temperature T1 detected by the temperature sensor 67 is higher than 60 ° C. (step S6: Y), the controller 80 determines whether or not at least one of the remote controllers 81A, 81B, 81C is ON (step S7). When at least one of the remote controllers 81A, 81B, 81C is ON (step S7: Y), the controller 80 drives the hot water supply pump P2 (step S8).

  Next, it is determined whether or not at least one of the remote controllers 81A, 81B, 81C is ON and the hot water temperature T2 detected by the temperature sensor 62 is higher than 70 ° C. (step S9). When at least one of the remote controllers 81A, 81B, 81C is ON and the hot water temperature T2 detected by the temperature sensor 62 is higher than 70 ° C. (step S9: Y), the controller 80 starts the operation of the cooling tower 57. At the same time, the feed water pump P3 and the cooling water pump P5 are driven (step S10). Next, the operation signal of the absorption chiller 50 is turned ON (step S11), the hot water supply pump P2 is controlled (step S12), and the water supply pump P3 is controlled (step S13).

  Next, it is determined whether or not an alarm for the absorption chiller 50 has occurred (step S14). When the alarm of the absorption chiller 50 is generated (step S14: Y), the controller 80 turns off the operation signal of the absorption chiller 50 (step S15), the hot water supply pump P2, the water supply pump P3, and the cooling water. The pump P5 and the cooling tower 57 are stopped (step S16), and the process returns to the beginning.

  When the alarm of the absorption refrigerator 50 has not occurred (step S14: N), the controller 80 determines whether or not all of the remote controllers 81A, 81B, 81C are OFF (step S17). If all of the remote controllers 81A, 81B, 81C are not OFF (step S17: N), the controller 80 proceeds to step S8. When all of the remote controllers 81A, 81B, 81C are OFF (step S17: Y), the controller 80 turns off the operation signal of the absorption chiller 50 (step S18), controls the absorption chiller 50 to stop, and supplies hot water. The pump P2 is stopped, the cooling water pump P5 is stopped, the operation of the cooling tower 57 is stopped (step S19), and the process returns to the beginning.

  In the determination of step S1, when the operation of the air conditioning apparatus 1 is the heating operation (step S1: N), the controller 80 determines whether or not the liquid level switch 66 is ON (step S21). When the liquid level switch 66 is ON (step S21: Y), the controller 80 determines whether or not the solar radiation sensor 72 is ON (step S22). When the solar radiation sensor 72 is OFF (step S22: N), the controller 80 determines whether or not the hot water tank temperature T1 detected by the temperature sensor 67 is higher than 30 ° C. (step S23). When the hot water tank temperature T1 detected by the temperature sensor 67 is higher than 30 ° C. (step S23: Y), the controller 80 shifts the process to step S27. When the hot water storage tank temperature T1 detected by the temperature sensor 67 is lower than 30 ° C. (step S23: N), the controller 80 shifts the processing to step S22.

When the solar radiation sensor 72 is ON (step S22: Y), the controller 80 drives the heat collection pump P1 (step S24) and controls the heat collection pump P1 (step S25).
Next, it is determined whether or not the hot water tank temperature T1 detected by the temperature sensor 67 is higher than 30 ° C. (step S26). When the hot water tank temperature T1 detected by the temperature sensor 67 is higher than 30 ° C. (step S25: Y), the controller 80 determines whether or not at least one of the remote controllers 81A, 81B, 81C is ON (step S27).

When at least one of the remote controllers 81A, 81B, 81C is ON (step S27: Y), the controller 80 drives the hot water supply pump P2 (step S28) and controls the hot water supply pump P2 (step S29).
Next, it is determined whether or not an alarm for the air conditioner 1 has occurred (step S30). When the alarm of the air conditioner 1 has not occurred (step S30: N), the controller 80 shifts the process to step S27. When the alarm of the air conditioner 1 is generated (step S30: Y), the controller 80 stops the hot water supply pump P2 (step S31) and returns to the beginning.

FIG. 3 is a process flowchart of liquid level control.
When the liquid level switch 66 is OFF (step S2: N or step S21: N in FIG. 2), the controller 80 opens the water supply valve SV (step S41). Next, it is determined whether or not the liquid level switch 66 is ON (step S42). When the liquid level switch 66 is ON (step S42: Y), the controller 80 closes the water supply valve SV (step S43) and ends the process.

  When the liquid level switch 66 is OFF (step S42: N), the controller 80 determines whether or not the elapsed time t from the opening of the water supply valve SV has passed 30 minutes (step S44). When the elapsed time t after opening the water supply valve SV has not passed 30 minutes (step S44: N), the controller 80 proceeds to step S42. When the elapsed time t after opening the water supply valve SV has passed 30 minutes (step S44: Y), the controller 80 generates an alarm (step S45), and the process proceeds to step S43.

FIG. 4 is a process flowchart of heat dissipation control.
When the hot water tank temperature T1 detected by the temperature sensor 67 during the cooling operation becomes higher than 60 ° C. (step S6: Y in FIG. 2), the controller 80 or the hot water tank temperature T1 detected by the temperature sensor 67 during the heating operation. Is higher than 30 ° C. (step S23: Y in FIG. 2 or step S26: Y), it is determined whether the hot water storage tank temperature T1 detected by the temperature sensor 67 is higher than 95 ° C. (step S51). When the hot water tank temperature T1 detected by the temperature sensor 67 is higher than 95 ° C. (step S51: Y), the controller 80 starts the operation of the radiator 69 and drives the heat dissipation pump P4 (step S52).

  Next, it is determined whether or not the hot water tank temperature T1 detected by the temperature sensor 67 is lower than 85 ° C. (step S53). When the hot water storage tank temperature T1 detected by the temperature sensor 67 is lower than 85 ° C. (step S53: Y), the controller 80 stops the operation of the radiator 69, stops the heat dissipation pump P4 (step S54), and performs processing. finish.

In the above-described embodiment, the solar water heater 60 using solar heat is used as the heat source of the absorption chiller 50 that cools the refrigerant in the subcooler 40, so that the running for cooling the refrigerant in the subcooler 40 is performed. Costs can be reduced and energy can be saved.
Moreover, in the air conditioning apparatus 1 of this Embodiment, 20-30 degreeC is enough for the temperature of the cold water which the absorption refrigeration machine 50 supplies in order to add supercooling. Therefore, in the absorption refrigerator 50 of the present embodiment, the cold water is cooled to 20 to 30 ° C. instead of the usual 7 ° C. As a result, the COP of the absorption chiller 50 rises from the normal 0.5 to 0.7 to 0.8, enabling highly efficient heat exchange.
Thus, at the time of cooling operation, the absorption chiller 50 is operated using the solar water heater 60, and the supercooling is performed using the chilled water of 20 to 30 ° C. supplied by the absorption chiller 50, so that the heat pump The efficiency of the cycle 100 can be improved. From summer cooling data, energy savings of around 20% have been confirmed.

Even during the heating operation, by using the solar water heater 60 using solar heat, the running cost for heating the refrigerant in the refrigerant heater 12 can be suppressed, and energy saving can be achieved.
Moreover, in the air conditioning apparatus 1 of this Embodiment, if the temperature (hot-water tank temperature) T1 utilized for heating a refrigerant | coolant is higher than 30 degreeC, there exists an effect of the highly efficient heat pump cycle 100. Therefore, the air-conditioning apparatus 1 according to the present embodiment is configured to perform the heating operation in the hybrid mode when the hot water tank temperature T1 is higher than 30 ° C. even when the sun is not emitted. ing. Thereby, even when the sun does not come out, when the hot water tank temperature T1 is higher than 30 ° C., the refrigerant evaporated in the outdoor heat exchanger 17 can be effectively heated by the refrigerant heater 12, The efficiency of the heat pump cycle 100 can be improved.

  As described above, according to the present embodiment, during the cooling operation, by operating the absorption refrigerator 50 using the solar water heater 60 using solar heat and cooling the refrigerant in the subcooler 40, Energy saving can be achieved. Further, by using the absorption chiller 50 capable of high-efficiency heat exchange for cooling in the supercooler 40, it is possible to efficiently supercool and improve the efficiency of the heat pump cycle 100.

Moreover, according to the said embodiment, since the refrigerant | coolant heater 12 using the solar water heater 60 is provided, a heating capability can be increased at the time of heating operation, and the efficiency of the heat pump cycle 100 can be improved.
Moreover, according to the said embodiment, since refrigerating capacity can be increased, the motive power of the gas engine 30 which drives the compressor 13 can be reduced.

However, the above embodiment is an aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.
For example, in the above embodiment, the solar water heater 60 is used as the heat source of the absorption chiller 50. However, the absorption chiller 50 may be operated using waste heat from a factory or the like as a heat source. In this case, what is necessary is just to set it as the structure which supplies the waste heat of a factory etc. to the regenerator 51 of the absorption refrigeration machine 50.

  Moreover, in the said embodiment, although the compressor 13 is driven with the gas engine 30, it is not limited to this, You may drive the compressor 13 with a motor etc.

It is a figure which shows the refrigerant circuit of the air conditioning apparatus concerning this invention. It is a process flowchart of the operation control of the air conditioning apparatus concerning this invention. It is a process flowchart of the liquid level control concerning this invention. It is a processing flowchart of the heat dissipation control concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air conditioning apparatus 2 Heat pump type air conditioner 12 Refrigerant heater 13 Compressor (compressor)
17 Outdoor heat exchanger 22A, 22B, 22C Indoor heat exchanger 30 Gas engine 40 Supercooler 50 Absorption type refrigerator 51 Regenerator (heat absorption part)
53 Condenser (heat dissipation part)
60 Solar water heater (heat source)

Claims (3)

A heat pump air conditioner in which a compressor, an outdoor heat exchanger, a supercooler, and an indoor heat exchanger are sequentially connected;
An absorption refrigerator having a heat dissipation unit connected to the supercooler,
A heat pump refrigerating apparatus, wherein a heat source utilizing solar heat or factory waste heat is connected to the heat absorption part of the absorption refrigerator.   The heat pump refrigeration apparatus according to claim 1, wherein the heat pump air conditioner includes a refrigerant heater, and the heat source is connected to the refrigerant heater.   The heat pump refrigeration apparatus according to claim 1 or 2, wherein the compressor is driven by a gas engine.

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