JP6906013B2 - heat pump - Google Patents

Description

The present invention relates to a heat pump. More specifically, the present invention relates to a heat pump using air as a refrigerant.

Conventional heat pumps mainly use HFC (HydroFluoroCarbon) chlorofluorocarbons or CO ₂ as a refrigerant. Therefore, if the refrigerant leaks, there is concern about _{global warming and an increase in CO 2 in the atmosphere.} Therefore, an air-conditioning system using a natural refrigerant that does not adversely affect the global environment is being studied.

Comparing the coefficient of performance (COP) of the current heat pump under the heat supply conditions of 90 ° C and 7 ° C, it is as follows.
Natural refrigerant (CO ₂ ) heat pump: COP3.0
Absorption heat pump: COP1.5
Adsorption heat pump: COP 0.6-0.7
Alternative CFC heat pump: COP4.5
Air Refrigerant Refrigerant: COP0.44

For air, which is the ultimate natural refrigerant, there is an air refrigerant refrigerator. However, the air refrigerant refrigerator is not advantageous in terms of performance because its use is limited to freezing in an ultra-low temperature region and its COP is about 0.44.

Further, a technique called compressed air storage (CAES) is known as a technique for smoothing an irregularly fluctuating and unstable power generation output such as renewable energy by using air as a working fluid. The CAES power generation device of Patent Document 1 stores compressed air discharged from a compressor when surplus generated power is generated, and reconverts it into electricity by an air turbo generator or the like when necessary.

Japanese Unexamined Patent Publication No. 2013-512410

The CAES power generation device of Patent Document 1 aims to smooth irregularly fluctuating and unstable power generation output such as renewable energy, and has a special suggestion that it is used as a heat pump using air as a refrigerant. It has not been.

An object of the present invention is to provide an air refrigerant heat pump capable of supplying hot and cold heat by using only air and water by utilizing a part of CAES technology as a heat pump. Another object of the present invention is to provide an air refrigerant heat pump having improved efficiency.

INDUSTRIAL APPLICABILITY According to the present invention, an electric motor driven by an input power, a first compressor mechanically connected to the electric motor to compress air, and heat exchange between compressed air and water compressed by the first compressor. 1 heat exchanger, a first hot water outlet for taking out water that has been heated by heat exchange in the first heat exchanger, an expander driven by compressed air compressed by the first compressor, and the expansion. A load generator mechanically connected to the machine, a second heat exchanger that exchanges heat between air and water expanded by the compressor, and water that has been cooled by heat exchange with the second heat exchanger. Provided is a heat pump provided with a cold water outlet for taking out.

The air temperature is raised by the heat of compression of the first compressor, and heat is exchanged between the air and water whose temperature has risen in the first heat exchanger to raise the temperature of the water and create hot water, so that hot water is produced from the first hot water outlet. Can be taken out. Moreover, since the working fluid is air and water, it is harmless even if it leaks into the atmosphere. Further, the air can be cooled by the endothermic heat absorbed by the expander, the cooled air and the water can exchange heat with the second heat exchanger, the water can be cooled, and the water can be taken out as cold water from the cold water outlet. Moreover, since not only hot water but also cold water can be taken out, COP can be increased and performance can be improved.

A first accumulator for storing compressed air compressed by the first compressor is further provided, the expander is driven by compressed air supplied from the first accumulator, and the load generating unit is a generator. Therefore, it is preferable that the generator is driven by the expander to generate electricity.

Energy is stored as compressed air by the first accumulator, and when necessary, compressed air is supplied to the expander to drive the generator to generate electricity, which not only cools and heats but also smoothes electric power at the same time. It is possible.

It is further preferable to further include a switching mechanism for switching the supply destination of the electric power generated by the generator to the electric motor or the demand destination.

By providing the switching mechanism, the power supply destination can be switched as needed. Specifically, the generator is normally supplied to the demand destination, and when there is no power demand from the demand destination, the power is supplied to the motor to drive the first compressor. You can effectively use the generated power of. In particular, when there is no power demand from the demand destination, the power is circulated inside the system, so the power supply required from outside the system can be reduced, and therefore the coefficient of performance (COP) is increased to improve performance. Can be improved.

The load generating portion is preferably the electric motor.

By integrating the motor and the load generating part, the number of components of the device can be reduced and the device can be miniaturized. In particular, when the load generating unit is a generator, the first compressor and the expander may be mechanically connected by using a motor generator.

It is preferable to have a heat recovery mechanism that recovers the heat generated by the motor and the load generating portion, raises the temperature of the water by the recovered heat, and takes out the water as hot water from the second hot water outlet.

It can be used to make hot water by recovering the heat generated by electrical loss and mechanical loss caused by electric motors and the like.

According to the present invention, in an air refrigerant heat pump, by utilizing a part of CAES technology as a heat pump, hot and cold heat can be supplied by using only air and water. In addition, efficiency can be improved conventionally.

The schematic block diagram of the heat pump which concerns on 1st Embodiment of this invention. The bar graph which shows the breakdown of COP at the time of heating and cooling and power generation operation of the heat pump of FIG. The bar graph which shows the breakdown of COP at the time of the exclusive operation of a heat pump of FIG. The schematic block diagram of the heat pump which concerns on 2nd Embodiment of this invention. The schematic block diagram of the heat pump which concerns on 3rd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

(First Embodiment)
FIG. 1 shows a schematic configuration diagram of a heat pump 2 according to the first embodiment of the present invention. The heat pump 2 of the present embodiment receives input power from the power generation device 4, produces two types of hot water (hot water A and B), cold water, and cold air using air as a refrigerant, and uses them for heating and cooling. Since the working fluid is air and water, it is harmless even if it leaks into the atmosphere.

In the present embodiment, a power generation device 4 using renewable energy such as wind power generation or solar power generation is used in consideration of environmental friendliness, but the type of the power generation device 4 is not particularly limited. Alternatively, the power generation device 4 may be a power system or the like connected to a commercial power source.

The heat pump 2 of the present embodiment includes a motor (motor) 6, a first compressor 8, an expander 10, a generator (load generator) 12, a first heat exchanger 14, and a second heat exchanger 18. These are fluidly connected by air pipes 20a to 20c and water supply pipes 22a to 22g.

First, the paths of the air pipes 20a to 20c will be described.

The electric power generated by the power generation device 4 is supplied to the motor 6. Hereinafter, the electric power supplied from the power generation device 4 to the motor 6 is referred to as an input electric power. The motor 6 is driven by the input power.

The first compressor 8 is mechanically connected to the motor 6 and is driven by the motor 6. The discharge port 8b of the first compressor 8 is fluidly connected to the air supply port 10a of the expander 10 through an air pipe 20b. When driven by the motor 6, the first compressor 8 takes in air from the intake port 8a, compresses the air, discharges the air from the discharge port 8b, and pumps the compressed air to the expander 10 through the air pipe 20b. The air pipe 20b is provided with a first heat exchanger 14.

In the first heat exchanger 14, the compressed air in the air pipe 20b extending from the first compressor 8 to the expander 10 and the water in the water supply pipe 22b extending from the water supply unit 28 to the first hot water outlet 38, which will be described later. The heat is exchanged with and the water in the water supply pipe 22b is heated by the compression heat generated by the first compressor 8. That is, in the first heat exchanger 14, the temperature of the compressed air decreases and the temperature of the water increases. In the first heat exchanger 14, the temperature can be adjusted to a predetermined temperature by adjusting the amount of heat exchange. In the present embodiment, the temperature of water is raised to room temperature or higher and the temperature of compressed air is lowered to room temperature or lower. Here, the room temperature of water is the temperature of industrial water, the temperature of water after heat exchange with the atmosphere using a cooling tower, etc., and generally varies from 5 to 30 ° C depending on the region and season. do. The room temperature of air is the temperature of the atmosphere, generally in the range of 0 to 40 ° C., and varies depending on the region and season.

The expander 10 is mechanically connected to the generator 12. The expander 10 supplied with compressed air from the air supply port 10a operates by the supplied compressed air to drive the generator 12. The generator 12 is electrically connected to the power system 16 and the motor 6 via a switch 24 (see the alternate long and short dash line in FIG. 1). Therefore, the electric power generated by the generator 12 (hereinafter referred to as the generated electric power) is supplied to the electric power system 16 or the motor 6. The supply destination of the generated power can be changed by switching the switch (switching mechanism) 24. The switch 24 may be switched according to the power demand required by the power system 16. Specifically, when power transmission from the generator 12 to the power system 16 is not required, the switch 24 is switched to supply the generated power of the generator 12 to the motor 6 of the first compressor 8 as a dedicated operation for heating and cooling. When power transmission from the generator 12 to the power system 16 is required, the switch 24 is switched to supply the power generated by the generator 12 to the power system 16 as an operation for both heating and cooling power generation. In particular, when there is no power demand from the demand destination and power transmission from the generator 12 to the power system 16 is unnecessary, the system required to drive the motor 6 is used to circulate the power in the system as a dedicated operation for heating and cooling. The power supply from the outside can be reduced, and therefore the performance coefficient COP (Coefficient Of Performance) can be increased to improve the performance.

The air expanded by the expander 10 is cooled by endothermic heat during expansion, and is sent out from the exhaust port 10b into the air pipe 20c. Since the compressed air supplied to the air supply port 10a of the expander 10 is cooled to below room temperature by the first heat exchanger 14, it is further cooled by the expander 10 to ensure that the air is cooled below room temperature. It is delivered into the pipe 20c. A second heat exchanger 18 is provided in the air pipe 20c. The cold air whose temperature has dropped below room temperature is supplied to the second heat exchanger 18 through the air pipe 20c.

In the second heat exchanger 18, heat is generated by the air below room temperature in the air pipe 20c extending from the expander 10 to the cold air outlet 26 and the water in the water supply pipe 22c extending from the diversion section 36 described later to the cold water outlet 30. Replaced and cooled the water below room temperature. That is, in the second heat exchanger 18, the temperature of air rises and the temperature of water falls. However, in the second heat exchanger 18, by adjusting the amount of heat exchange, the air is heated but maintained at room temperature or lower. After heat exchange in the second heat exchanger 18, the air maintained below room temperature, that is, cold air, is supplied to the cold air outlet 26 through the air pipe 20c, is taken out from the cold air outlet 26 to the outside of the heat pump, and is used for cooling. Will be done. Demand for air conditioning includes, for example, data centers that require enormous cooling to cool computers, precision machine factories and semiconductor factories that are required to be adjusted to a constant temperature due to restrictions in the manufacturing process.

Next, the route of the water supply pipes 22a to 22g will be described.

The water supplied from the water supply unit 28 is pressurized and flows by the pump 32a in the water supply pipe 22a. A cooling tower 34 is provided in the water supply pipe 22a, and the water in the water supply pipe 22a is cooled to a constant temperature by the cooling tower 34. The cooling temperature may be, for example, about room temperature, or may be determined based on the amount of heat exchange in the individual heat exchangers 14, 18, 40, 42. The water supply pipe 22a is divided into water supply pipes 22b to 22e at a diversion portion 36 downstream of the cooling tower 34.

One end of the water supply pipe 22b is connected to the diversion portion 36, and the other end is connected to the first hot water outlet 38. The water heated to room temperature or higher in the first heat exchanger 14 provided in the water supply pipe 22b is taken out from the first hot water outlet 38 as hot water A to the outside of the heat pump and used for heating or the like.

One end of the water supply pipe 22c is connected to the diversion portion 36, and the other end is connected to the chilled water outlet 30. The water cooled to room temperature or lower in the second heat exchanger 18 provided in the water supply pipe 22c is taken out as cold water from the chilled water outlet 30 to the outside of the heat pump and used for cooling or the like. In this way, not only hot water but also cold water can be taken out, so that the coefficient of performance COP can be increased and the performance can be improved.

One end of the water supply pipe 22d is connected to the diversion portion 36, and the other end is connected to the second hot water outlet 44. One end of the water supply pipe 22e joins the diversion portion 36, and the other end joins the water supply pipe 22d downstream of the third heat exchanger 40. The water supply pipe 22d and the water supply pipe 22e are provided with a third heat exchanger 40 and a fourth heat exchanger 42, respectively, in order to raise the temperature of the water inside.

In the present embodiment, in order to recover the heat capable of producing hot water, which is smaller than the heat of compression such as electric loss and mechanical loss caused by the motor 6 and the generator 12, the third heat exchanger 40 and the third heat exchanger are used. 4 A heat exchanger 42 is provided. The electric loss includes an inverter loss and a converter loss (not shown) caused by the motor 6 and the generator 12. In the third heat exchanger 40 and the fourth heat exchanger 42, the water in the water supply pipe 22d and the water supply pipe 22e and the heat medium pipes 21a and 21b that recover heat from the motor 6 and the generator 12 and circulate by the pumps 32b and 32c. Heat is exchanged with a heat medium such as lubricating oil inside. That is, in the third heat exchanger 40 and the fourth heat exchanger 42, the temperature of water rises and the temperature of the heat medium falls. The water heated to a predetermined temperature is taken out as hot water B from the second hot water outlet 44 to the outside of the heat pump. Therefore, the heat medium pipes 21a and 21b, the third heat exchanger 40, and the fourth heat exchanger 42 are included in the heat recovery mechanism 46 of the present invention. Since the temperature of the hot water B taken out from the second hot water outlet 44 is usually lower than that of the hot water A taken out from the first hot water outlet 38, a hot bath facility, a hot water pool, and an agricultural facility that can be used even at a relatively low temperature. It is conceivable to use it for heating.

The cold water and hot water A and B used for cooling and heating are collected from the drainage section 48 through the water supply pipes 22f and 22g. The drainage section 48 and the water supply section 28 are connected by a pipe (not shown), and the water recovered from the drainage section 48 is returned from the water supply section 28 through the water supply pipe 22a to the individual heat exchangers 14, 18, 40 via the cooling tower 34. , 42 is supplied. That is, the water used in this embodiment is circulated and used in the water supply pipes 22a to 22g.

Preferably, the first heat exchanger 14 and the second heat exchanger 18 use plate heat exchangers capable of large capacity heat exchange to obtain hot water A, B, cold water, and cold air at desired temperatures. It is better to do it.

The types of the first compressor 8 and the expander 10 of the present embodiment are not limited, and may be a screw type, a scroll type, a turbo type, a reciprocating type, or the like. However, the screw type is preferable in order to have high responsiveness and linearly follow the input power that fluctuates irregularly such as renewable energy so as to correspond to the power generation device 4 of the present embodiment. Further, although the number of the first compressor 8 and the expander 10 of the present embodiment is both one, the number is not particularly limited, and two or more compressors may be provided in parallel.

The performance of the heat pump 2 will be described.

There is a coefficient of performance COP as a coefficient for evaluating the performance of an air conditioning system such as the heat pump 2. The COP is obtained by dividing the power supplied to the system Li by the amount of generated electric heat LQ (COP = LQ / Li). In the present embodiment, the switch 24 can switch between the air-conditioning power generation combined operation and the air-conditioning dedicated operation. Therefore, both operation modes will be described below while exemplifying the individual recovered heat amounts of the electric power supplied to the system Li and the generated electric heat amount LQ, but the numerical values exemplified are not intended to limit the scope of the present invention.

FIG. 2A is a bar graph showing a breakdown of COP in the case of the air-conditioning power generation combined operation of the present embodiment and in the case of the air-conditioning dedicated operation.

First, a case of combined operation for heating and cooling power generation will be described with reference to FIG. 2A.

The electric power Li supplied to the system is generated by the power generation device 4, and is supplied as electric power of about 90 kW from the power generation device 4 to drive the motor 6.

The generated electric heat amount LQ is represented by adding the electric energy Lg generated by the generator 12 and supplied to the electric power system 16 to the total calorific value of the hot water A, the hot water B, the cold water, and the cold air taken out.

The hot water A taken out from the first hot water outlet 38 is hot water heated by the first heat exchanger 14 by utilizing the heat of compression in the first compressor 8. In the present embodiment, for example, hot water A at about 90 ° C. can be recovered, and the amount of heat recovered is about 65 kW. The recovery temperature of the hot water A may be determined by adjusting the specifications of the first heat exchanger 14 so that the discharge air temperature of the first compressor 8 is about −10 ° C. to 60 ° C.

The hot water B taken out from the second hot water outlet 44 was heated by the third heat exchanger 40 and the fourth heat exchanger 42 by utilizing the heat generated by the electric loss and the mechanical loss in the motor 6 and the generator 12. It is hot water. In this embodiment, for example, hot water B at about 70 ° C. can be recovered, and the amount of heat recovered is about 15 kW.

The cold air taken out from the cold air outlet 26 is the cold air cooled by the endothermic heat at the time of expansion in the expander 10. In the present embodiment, for example, the cold air sent from the exhaust port 10b of the expander 10 is about −50 ° C. to −110 ° C., from which it is heated by the second heat exchanger 18 and finally 10 ° C. to 17 ° C. A degree of cold air can be recovered, and the amount of heat recovered is about 7 kW.

The cold water taken out from the cold water outlet 30 is cold water cooled by the second heat exchanger 18 by the cold air sent out from the expander 10. In this embodiment, for example, cold water of about 7 ° C. can be recovered, and the amount of heat recovered is about 40 kW.

The amount of electric power Lg generated by the generator 12 and supplied to the electric power system 16 is about 40 kW.

Since the generated electric heat amount LQ is the total of these, LQ = 167 (= 15 + 65 + 40 + 7 + 40) kW.

Therefore, the coefficient of performance of the heat pump 2 during the combined operation of heating and cooling power generation in the present embodiment is COP = 1.86 (= 167 kW / 90 kW).

Next, a case of dedicated air-conditioning operation will be described with reference to FIG. 2B.

The electric power supplied to the system Li is generated by a power generation device 4 that uses renewable energy such as wind power generation and solar power generation, and is supplied as electric power of about 50 kW to drive the motor 6. About 90 kW of electric power is required to drive the motor 6, but in the case of dedicated operation for heating and cooling, the remaining about 40 kW of electric power is circulated and supplied from the generator 12 in the system. Therefore, the power supplied to the system Li is about 50 kW.

The amount of heat generated LQ is the same as the amount of heat (hot water A, B, cold water, and cold air) taken out individually as in the case of combined operation for heating and cooling power generation, but the amount of power generated by the generator 12 and supplied to the power system 16 Lg. Does not exist, so it becomes 0 kW. Therefore, since the generated electric heat amount LQ is the total of these, LQ = 127 (= 15 + 65 + 40 + 7 + 0) kW.

Therefore, the coefficient of performance of the heat pump 2 during the dedicated operation for heating and cooling in the present embodiment is COP = 2.54 (= 127 kW / 50 kW), which is a great improvement in performance from the conventional air refrigerant heat pump, which has been difficult until now. COP = 2.0 or more.

(Second Embodiment)
FIG. 3 shows a schematic configuration diagram of the heat pump 2 of the second embodiment. The heat pump 2 of the present embodiment is substantially the same as the configuration of the first embodiment of FIG. 1 except that the motor generator 50 in which the motor and the generator are integrated is used. Therefore, the description of the same parts as those shown in FIG. 1 will be omitted.

In the present embodiment, the first compressor 8 and the expander 10 are mechanically connected coaxially via an electric generator 50 in which a motor and a generator are integrated. By connecting the first compressor 8 and the expander 10 using the motor generator 50, the atmospheric expansion torque of the compressed air can be used as an auxiliary to the air compression torque, and the input power to the motor generator 50 can be reduced. .. Since the generator 12 (see FIG. 1) is substantially omitted from the first embodiment, the heat recovery mechanism 46 is simplified, and the heat medium pipe 21b (see FIG. 1), the pump 32c, and the heat medium pipe 21b (see FIG. 1) are simplified from the first embodiment. And the fourth heat exchanger 42 (see FIG. 1) are omitted. Therefore, the system cost can be reduced, and the electric loss and mechanical loss in the generator, as well as the inverter loss and converter loss for the generator can be reduced.

(Third Embodiment)
FIG. 4 shows a schematic configuration diagram of the heat pump 2 of the third embodiment. The heat pump 2 of this embodiment is a compressed air storage (CAES) power generation device 2. Specifically, in the CAES power generation device 2, in addition to the configuration of the heat pump 2 of the first embodiment shown in FIG. 1, the first accumulator tank (first accumulator) 52 and the second accumulator tank (second accumulator) 54 is provided. Since the CAES power generation device 2 can store energy in the form of compressed air and can be converted into electric power as needed, the electric power generated like the power generation device 4 using renewable energy such as wind power generation and solar power generation can be generated. Unstable power generation that fluctuates irregularly can be smoothed. Since there are many parts in the present embodiment that have the same configuration as the first embodiment, the description of the parts similar to the configuration shown in FIG. 1 will be omitted.

The CAES power generation device 2 of the present embodiment is provided with a first accumulator tank 52 for storing compressed air discharged from the first compressor 8 in an air pipe 20b extending from the first compressor 8 to the expander 10. .. That is, energy can be stored in the first accumulator tank 52 in the form of compressed air. The compressed air stored in the first accumulator tank 52 is supplied to the expander 10 through the air pipe 20c. A valve 56 is provided in the air pipe 20c, and the supply of compressed air to the expander 10 can be allowed or cut off by opening and closing the valve 56. Energy is stored as compressed air by the first accumulator tank 52, and compressed air is supplied to the expander 10 as needed to drive the generator 12 to generate electricity, thereby generating power output of the power generation device 4 using renewable energy. Can be smoothed.

Further, the CAES power generation device 2 of the present embodiment has a second compressor 58 that compresses air to a higher pressure than the first compressor 8, and an allowable accumulator value higher than the allowable accumulator value of the first accumulator tank 52. A second accumulator tank 54 is provided. Here, the allowable accumulator value means the maximum working pressure that does not lead to failure or destruction of the accumulator tank.

A motor 7 is mechanically connected to the second compressor 58 in the same manner as the first compressor 8. The second compressor 58 is driven by the motor 7, takes in air from the intake port 58a, compresses the air to a higher pressure than that of the first compressor 8, and supplies the compressed air from the discharge port 58b to the second accumulator tank 54. do. Therefore, the pressure in the second accumulator tank 54 is usually higher than the pressure in the first accumulator tank 52. As an example of the pressure (accumulation value) of the first accumulator tank and the second accumulator tank 54, it is conceivable that the first accumulator tank 52 is set to less than 0.98 MPa and the second accumulator tank 54 is set to about 4.5 MPa.

The second accumulator tank 54 is fluidly connected to the first accumulator tank 52 and the expander 10 through an air pipe 20d. Specifically, one end of the air pipe 20d is fluidly connected to the second accumulator tank 54, and the other end is fluidly connected to the air pipe 20c. A flow rate adjusting valve 60 is provided in the air pipe 20d, and the flow rate of air supplied to the first accumulator tank 52 and the expander 10 can be adjusted by adjusting the opening degree of the flow rate adjusting valve 60. By supplying decompressed high-pressure air to the expander 10, the generator 12 is driven to generate electricity, and by supplying decompressed high-pressure air to the first accumulator tank 52, the compression stored in the first accumulator tank 52 is reduced. The amount of air can be supplemented.

By providing the second accumulator tank 54 and the second compressor 58, it is possible to supply emergency power and cooling for a long time in an emergency such as a power failure. Specifically, the flow rate adjusting valve 60 is normally closed, and the internal pressure of the second accumulator tank 54 is kept high. When a large amount of power is required due to a power failure or the like, or when the internal pressure of the first accumulator tank 52 drops due to long-term power generation, the flow rate adjusting valve 60 is opened to move from the second accumulator tank 54 to the expander 10. Supply a lot of compressed air. As a result, it is possible to prevent a decrease in the amount of power generated by the generator 12 driven by the expander 10, and at the same time, cold air and cold water can be taken out. This is particularly effective for consumers who require a large amount of cold heat, such as data centers and large computers.

2 Heat pump (compressed air storage (CAES) power generator)
4 Power generators 6, 7 Motors (motors)
8 First compressor 8a Intake port 8b Discharge port 10 Expander 10a Air supply port 10b Exhaust port 12 Generator (load generator)
14 1st heat exchanger 16 Power system 18 2nd heat exchanger 20a, 20b, 20c, 20d Air piping 21a, 21b Heat medium piping 22a, 22b, 22c, 22d, 22e, 22f, 22g Water supply piping 24 switches (switching mechanism) )
26 Cold air outlet 28 Water supply unit 30 Cold water outlet 32a, 32b, 32c Pump 34 Cooling tower 36 Dividing unit 38 1st hot water outlet 40 3rd heat exchanger 42 4th heat exchanger 44 2nd hot water outlet 46 Heat recovery mechanism 48 Drainage section 50 Motor generator 52 1st accumulator tank (1st accumulator section)
54 Second accumulator tank (second accumulator)
56 Valve 58 Second compressor 58a Intake port 58b Discharge port 60 Flow rate adjustment valve

Claims (2)

An electric motor driven by input power and
A first compressor that is mechanically connected to the motor and compresses air,
A first heat exchanger that exchanges heat between compressed air compressed by the first compressor and water,
A first hot water outlet for taking out water that has been heated by heat exchange with the first heat exchanger, and
A first accumulator that stores compressed air compressed by the first compressor, and
An expander driven by compressed air supplied from the first accumulator and
A generator that is mechanically connected to the inflator and driven by the inflator,
A second heat exchanger that exchanges heat between air and water expanded by the expander,
A cold water outlet that takes out the water that has cooled down by exchanging heat with the second heat exchanger,
A switching mechanism for switching the supply destination of the electric power generated by the generator to the electric motor or the demand destination is provided .
The switching mechanism is a heat pump configured to supply the generated power of the generator to the motor as a dedicated operation for heating and cooling when power transmission from the generator to the power system is unnecessary. The heat pump according to claim 1, further comprising a heat recovery mechanism that recovers heat generated by the motor and the generator, raises the temperature of water by the recovered heat, and takes out as hot water from a second hot water outlet. ..

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