A hydraulic compression energy storage system based on refrigeration system transformation and operation method

Abstract

The present invention discloses a hydraulic compression energy storage system and operation method based on the transformation of a refrigeration system. The system includes a condenser. The outlet end of the condenser is connected to the inlet end of the evaporator and the gas tank respectively through a first pipeline. The outlet ends of the evaporator and the gas tank are connected to the inlet end of the compression device; the inlet end of the condenser is connected to the outlet end of the compression device through a second pipeline. The outlet end of the compression device is also connected to a water reservoir through a driving device. On the one hand, the system solves the technical problem of poor energy storage effect due to poor discharge of compression heat from the gas tank in the existing hydraulic compression energy storage technology by releasing heat from the liquid phase working medium in the hydraulic compression energy storage system in the condenser. On the other hand, the condenser is connected to the gas tank to transport the liquid phase refrigerant at the outlet of the condenser to the gas tank for storage, so that the refrigeration system has the function of energy storage and power generation.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydraulic compression energy storage, and in particular relates to a hydraulic compression energy storage system based on refrigeration system transformation and an operating method. Background Art

[0002] Hydraulic compression energy storage technology is a technology that uses water power to convert electrical energy into mechanical energy or mechanical energy into electrical energy. Unlike traditional hydropower generation (such as hydropower stations), hydraulic compression energy storage technology does not rely on natural water flow or water level difference, but uses an artificial pressure system to store and release energy, which makes it applicable in a wider geographical environment and has less impact on the natural environment.

[0003] However, during the hydraulic compression process, the existing energy storage system fails to meet the energy storage effect due to the poor discharge of compression heat from the gas tank. For example, Publication No. CN116576704B discloses a liquid carbon dioxide energy storage system for synchronous photoelectric utilization. The system mainly stores liquid carbon dioxide in a heat storage tank, vaporizes the liquid carbon dioxide through an external vaporization device, and uses the energy released during its phase change to produce electricity. This solution requires gasification through an external vaporization component due to the insufficient heat exchange capacity of the gas tank. On the other hand, as disclosed in Publication No. CN110645737B, a system and method for energy storage-type renewable energy utilization and air conditioning waste heat recovery, integrates a heat pump system and a water storage tank for heat storage in the refrigeration system. Although this system has a heat storage function, the additional equipment investment is high, and the stored heat is low-temperature hot water, which cannot realize the energy storage and power generation function. Summary of the Invention

[0004] The present invention provides a hydraulic compression energy storage system and an operating method based on the transformation of a refrigeration system. On the one hand, it is used to solve the problem that the compression heat of the gas storage tank in the existing energy storage system cannot be discharged smoothly, resulting in substandard energy storage effect. On the other hand, it solves the technical defect that the existing energy storage refrigeration system only has a heat storage function but cannot achieve power generation.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In the first aspect, a hydraulic compression energy storage system based on the transformation of a refrigeration system is provided, comprising: a condenser, wherein the outlet end of the condenser is connected to the inlet ends of an evaporator and an air storage tank respectively through a first pipeline, and the outlet ends of the evaporator and the air storage tank are connected to the inlet end of a compression device; the inlet end of the condenser is connected to the outlet end of the compression device through a second pipeline, and the outlet end of the compression device is also connected to a water tank through a driving device.

[0007] Furthermore, the working fluid in the gas storage tank is difluoromethane.

[0008] Furthermore, the driving device includes a generator and a water supply pump, the driving end of the generator is connected to one end of the water supply pump, and the other end of the water supply pump is connected to the water reservoir.

[0009] Furthermore, the driving device also includes an electric motor and a water turbine, the driving end of the electric motor is connected to one end of the water turbine, and the other end of the water turbine is connected to the water reservoir.

[0010] Furthermore, a transmission is provided on the driving end of the generator.

[0011] Furthermore, the compression device and the driving device are coaxially arranged.

[0012] Furthermore, a heat exchanger is provided outside the gas storage tank.

[0013] Furthermore, the heat exchanger is a jacketed heat exchanger, and fins are provided between the gas storage tank and the jacketed heat exchanger.

[0014] Furthermore, the evaporator is provided with an air inlet.

[0015] In a second aspect, a method for operating a hydraulic compression energy storage system based on refrigeration system modification is provided, wherein the method is performed using the system described above, and comprises:

[0016] During the off-peak period of electricity consumption, the water feed pump is driven to pass the water working medium in the water reservoir into the gas storage tank, and the vapor phase refrigerant in the gas storage tank is sent to the compression device. The operating power of the driving device is controlled to increase the mass flow rate of the refrigerant in the compression device so that part of the liquid phase refrigerant passing through the condenser enters the gas storage tank for energy storage;

[0017] During peak hours of electricity consumption, air is used to heat the high-pressure liquid refrigerant in the gas tank, causing it to vaporize and expand to drive the device.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. On the one hand, this system solves the technical problem of poor energy storage effect due to poor heat discharge from the gas tank in the existing hydraulic compression energy storage technology by releasing heat from the liquid phase working fluid in the hydraulic compression energy storage system in the condenser. On the other hand, the condenser is connected to the gas tank, and the liquid phase refrigerant at the outlet of the condenser is transported to the gas tank for storage, so that the refrigeration system has the function of energy storage. Secondly, in the process of energy release, the liquid phase refrigerant in the gas tank is vaporized and expanded to generate electricity, which not only enables the refrigeration system to have the function of energy storage and power generation, but also saves the investment in organic working fluid of the hydraulic compression energy storage system, eliminates the hydraulic compression, pressure increase and temperature reduction process of the gas tank, and reduces operating costs.

[0020] 2. When difluoromethane is used as the working fluid in the gas tank, it can efficiently exchange heat and provide a stable low-temperature environment for the system that needs cooling.

[0021] 3. Directly driving the water pump through the generator can reduce the loss in the energy conversion process, improve energy utilization efficiency and reduce energy consumption.

[0022] 4. The electric motor can efficiently convert electrical energy into mechanical energy, and then transmit it to the turbine. The turbine uses this mechanical energy to drive the water flow to perform other work, thereby achieving efficient conversion and utilization of energy.

[0023] 5. Setting a transmission on the driving end of the generator can improve energy conversion efficiency, protect the generator to adapt to different loads and improve system flexibility.

[0024] 6. Since the compression device and the drive device are coaxial, they can share the same power source, thereby reducing energy transmission loss, improving energy utilization efficiency, and enhancing the synergy between the compression device and the drive device, making them work more closely together and achieving more efficient energy conversion and transmission.

[0025] 7. The jacketed heat exchanger enables efficient heat exchange between the gas tank and the external medium. By introducing hot and cold media through the jacket, the temperature inside the gas tank can be quickly adjusted to meet process requirements. The fins installed between the jacketed heat exchanger and the gas tank can significantly increase the heat transfer area. Finally, the fins make heat transfer more efficient, thereby improving heat transfer efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A schematic diagram of the structure of a hydraulic compression energy storage system based on refrigeration system transformation provided by the present invention;

[0028] Figure 2 A flow chart of the method for operating a hydraulic compression energy storage system based on refrigeration system transformation provided by the present invention;

[0029] In the figure: 1. Condenser; 2. Throttle valve; 3. Evaporator; 4. Gas storage tank; 5. Compression device; 6. Generator; 7. Transmission; 8. Water pump; 9. Water reservoir. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0033] In the description of the embodiments of the present invention, it should be noted that if the terms "upper," "lower," "horizontal," "inner," etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is typically placed when in use. These terms are merely for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] Hydraulic compression energy storage technology is a technology that uses water power to convert electrical energy into mechanical energy or mechanical energy into electrical energy. Unlike traditional hydropower generation (such as hydropower stations), hydraulic compression energy storage technology does not rely on natural water flow or water level difference, but uses an artificial pressure system to store and release energy, which makes it applicable in a wider geographical environment and has less impact on the natural environment.

[0037] However, during the hydraulic compression process, the existing energy storage system fails to meet the energy storage effect due to the poor discharge of compression heat from the gas tank. For example, Publication No. CN116576704B discloses a liquid carbon dioxide energy storage system for synchronous photoelectric utilization. The system mainly stores liquid carbon dioxide in a heat storage tank, vaporizes the liquid carbon dioxide through an external vaporization device, and uses the energy released during its phase change to produce electricity. This solution requires gasification through an external vaporization component due to the insufficient heat exchange capacity of the gas tank. On the other hand, as disclosed in Publication No. CN110645737B, a system and method for energy storage-type renewable energy utilization and air conditioning waste heat recovery, integrates a heat pump system and a water storage tank for heat storage in the refrigeration system. Although this system has a heat storage function, the additional equipment investment is high, and the stored heat is low-temperature hot water, which cannot realize the energy storage and power generation function.

[0038] In order to solve the problem that the compression heat of the gas tank in the existing energy storage system cannot be discharged smoothly, resulting in substandard energy storage effect, and to solve the technical defect that the existing energy storage refrigeration system only has heat storage function but cannot generate electricity, the inventor provides a hydraulic compression energy storage system and operation method based on the modification of the refrigeration system.

[0039] The present invention is described in further detail below with reference to the accompanying drawings:

[0040] In the first aspect, an embodiment of the present invention provides a hydraulic compression energy storage system based on the transformation of a refrigeration system, the system includes a condenser 1, the condenser 1 includes an inlet end and an outlet end, wherein the outlet end of the condenser 1 is connected to the inlet end of the evaporator 3 and the gas storage tank 4 respectively through a first pipeline, the working medium in the gas storage tank 4 is difluoromethane, and a throttle valve 2 is also installed on the path connecting the first pipeline and the evaporator 3; the outlet end of the evaporator 3 and the gas storage tank 4 is connected to the inlet end of the compression device 5; the inlet end of the condenser 1 is connected to the outlet end of the compression device 5 through a second pipeline, and the outlet end of the compression device 5 is also connected to the water reservoir 9 through a driving device. Figure 1As shown, during the off-peak period of electricity consumption, the operating power of the compression device 5 can be increased by controlling the operating power of the driving device, so as to increase the refrigerant quality and flow rate of the compression device 5; secondly, the low-temperature and low-pressure vapor-phase refrigerant is converted into a high-temperature and high-pressure vapor-phase refrigerant after passing through the compression device 5, and the high-temperature and high-pressure vapor-phase refrigerant is converted into a high-pressure liquid-phase refrigerant after passing through the condenser 1 to release heat; the high-pressure liquid-phase refrigerant is converted into a low-pressure liquid-phase refrigerant after passing through the throttle valve 2, and then absorbs heat through the evaporator 3 to be converted into a low-pressure vapor-phase refrigerant, and the low-pressure vapor-phase refrigerant finally returns to the compression device 5 and is controlled by the throttle valve 2. The opening of the inlet valve controls the flow of refrigerant entering the throttle valve 2 branch; the other branch of high-pressure liquid refrigerant flows into the gas tank 4. Since the gas tank 4 is full of water working medium at this time, part of the water working medium will be displaced and transported to the water reservoir 9 during the process of sending the refrigerant (difluoromethane) into the gas tank 4. By adjusting the opening of the inlet valve of the gas tank 4, the liquid level of the refrigerant in the gas tank 4 can be controlled. When the amount of refrigerant in the gas tank 4 reaches the set value, the gas tank 4 completes energy storage, and the process of the refrigerant amount in the gas tank 4 reaching the set value can be completed by sensor monitoring.

[0041] Since an air inlet is provided on the evaporator 3, the high-pressure liquid refrigerant stored in the gas tank 4 can be converted into a vapor-phase refrigerant by heating the gas tank 4 with air during peak power consumption, causing it to vaporize and expand, and push the water refrigerant in the gas tank 4 to flow to the drive device, so that the drive device generates electricity and reduces the power load; by controlling the air flow entering the gas tank 4, the expansion rate of the liquid refrigerant can be controlled. After the liquid refrigerant in the gas tank 4 is completely expanded into the vapor phase, water refrigerant is filled into the gas tank 4, and the low-pressure vapor-phase refrigerant is discharged into the compression device 5. By controlling the liquid level and quality of the water refrigerant in the gas tank 4, when the water refrigerant level in the gas tank 4 reaches a preset value (this process is completed through sensor monitoring), water injection is stopped and the gas tank 4 completes energy release. During the operation of the system, since the liquid phase working fluid stored in the gas tank 4 releases heat in the condenser 1 of the original refrigeration system, there is no need for the energy storage working fluid to release heat in the gas tank 4. Therefore, there is no need to consider the problem of compression heat discharge of the gas tank 4 during the compression process. This not only simplifies the design of the gas tank 4, but also avoids the problem of substandard energy storage effect due to poor compression heat discharge of the gas tank 4. Secondly, by diverting the refrigerant at the outlet of the condenser 1, one of the liquid phase refrigerants is sent to the gas tank 4 for storage. When energy release is required, air is passed into the gas tank 4, and the liquid phase refrigerant in the gas tank 4 vaporizes and expands to generate power. When the refrigeration system needs to reach its maximum refrigeration capacity, the passage between the condenser 1 and the gas tank 4 is closed, and all the refrigerant at the outlet of the condenser 1 is sent to the throttle valve 2, so that the refrigeration system has the function of energy storage and power generation, and does not affect the maximum refrigeration capacity of the original refrigeration system. It is suitable for integrated energy systems with cooling and energy storage needs. Finally, by diverting the refrigerant at the outlet of condenser 1, one of the liquid refrigerant flows is sent to gas receiver 4 for storage. The refrigerant stored in gas receiver 4 originates from the refrigeration system, saving investment in organic refrigerant for the hydraulic compression energy storage system. The liquid refrigerant stored in gas receiver 4 releases heat in condenser 1 of the existing refrigeration system, and the refrigerant's pressure is increased in the existing refrigeration system's compressor. This eliminates the hydraulic compression process of gas receiver 4, which increases pressure and reduces temperature, thereby reducing operating costs.

[0042] In this embodiment, in one embodiment, the driving device includes a generator 6 and a water pump 8, the driving end of the generator 6 is connected to one end of the water pump 8, and the other end of the water pump 8 is connected to the water reservoir 9. The water pump 8 is directly driven by the generator 6 to pump the water in the water reservoir 9, which can reduce the loss in the energy conversion process, improve energy utilization efficiency, and reduce energy consumption. In another embodiment, the driving device also includes an electric motor and a turbine, the driving end of the electric motor is connected to one end of the turbine, and the other end of the turbine is connected to the water reservoir 9. The electric motor can efficiently convert electrical energy into mechanical energy, and then transmit it to the turbine. The turbine uses this mechanical energy to drive the water flow to perform other work, thereby realizing efficient conversion and utilization of energy. During the operation of the system, the selection of the above different equipment can be selected according to the specific operating requirements, scenarios and environment of the system, and this embodiment is not limited thereto.

[0043] In this embodiment, Figure 1 As shown, a transmission 7 is provided on the driving end of the generator 6. The setting of the transmission 7 can be adaptively adjusted according to specific operating conditions and operating requirements, thereby improving energy conversion efficiency, protecting the generator 6 to adapt to different loads and improving system flexibility.

[0044] In this embodiment, the compression device 5 is preferably a compressor. The compressor and the driving device are coaxially arranged and can share the same power source, thereby reducing energy transmission losses, improving energy utilization efficiency, and enhancing the synergy between the compressor and the driving device, so that they work more closely together to achieve more efficient energy conversion and transmission.

[0045] In this embodiment, a jacketed heat exchanger is installed outside the gas tank 4, with fins positioned between the gas tank 4 and the jacketed heat exchanger. The jacketed heat exchanger enables efficient heat exchange between the gas tank 4 and the external medium. By introducing hot and cold media through the jacket, the temperature within the gas tank 4 can be quickly adjusted to meet process requirements. The fins positioned between the jacketed heat exchanger and the gas tank 4 significantly increase the heat transfer area. Finally, the fins allow for more efficient heat transfer, thereby improving heat transfer efficiency.

[0046] In a second aspect, an embodiment of the present invention provides a method for operating a hydraulic compression energy storage system based on a refrigeration system transformation, wherein the method is performed using the system as described above. Figure 2 Shown, including:

[0047] S101. During the period of low electricity consumption, the water supply pump is driven to pass the water working medium in the water reservoir into the gas storage tank, and the vapor-phase refrigerant in the gas storage tank is sent to the compression device, the operating power of the driving device is controlled, and the mass flow rate of the refrigerant in the compression device is increased so that part of the liquid-phase refrigerant passing through the condenser enters the gas storage tank for energy storage; illustratively, the water supply pump 8 is driven to pass the water working medium in the water reservoir 9 into the gas storage tank 4, and the vapor-phase refrigerant in the gas storage tank 4 is sent to the compression device 5, the operating power of the driving device is controlled, and the mass flow rate of the refrigerant in the compression device 5 is increased so that part of the liquid-phase refrigerant passing through the condenser 1 enters the gas storage tank 4 for energy storage. During the low electricity consumption period, by controlling the operating power of the driving device, the operating power of the compression device 5 can be increased to increase the refrigerant quality and flow rate of the compression device 5. During the low electricity consumption period, the electricity cost is low, and increasing the operating power will not significantly increase the operating cost. The improvement in refrigeration efficiency helps to reduce the overall energy consumption. By increasing the operating power of the compression device 5 during the low electricity consumption period, the surplus power resources in the power grid can be more effectively utilized to avoid power waste. Secondly, the low-temperature and low-pressure vapor-phase refrigerant is converted into a high-temperature and high-pressure vapor-phase refrigerant after passing through the compression device 5. The high-temperature and high-pressure vapor-phase refrigerant is converted into a high-pressure liquid-phase refrigerant after releasing heat through the condenser 1. The refrigerant in the high-temperature and high-pressure state has a higher energy density and a faster heat transfer rate. Therefore, it can exchange heat with the medium in the condenser more quickly, thereby significantly improving the heat transfer efficiency, helping the refrigerant to release a large amount of heat in a shorter period of time, thereby accelerating the speed of the refrigeration cycle and improving the efficiency of the entire refrigeration system. One path of the high-pressure liquid refrigerant passes through the throttle valve 2 and is converted into a low-pressure liquid refrigerant. The refrigerant then absorbs heat in the evaporator 3 and is converted into a low-pressure vapor refrigerant. The low-pressure vapor refrigerant finally returns to the compression device 5. By controlling the opening of the inlet valve of the throttle valve 2, the refrigerant flow rate entering the throttle valve 2 branch is controlled; and the other path of the high-pressure liquid refrigerant flows into the gas storage tank 4. Since the gas storage tank 4 is full of water working medium at this time, part of the water working medium will be displaced and transported to the water reservoir 9 during the process of sending the refrigerant (difluoromethane) into the gas storage tank 4. By adjusting the opening of the inlet valve of the gas storage tank 4, the liquid level of the refrigerant in the gas storage tank 4 can be controlled. When the refrigerant amount in the gas storage tank 4 reaches the set value, the gas storage tank 4 completes energy storage.

[0048] S102. During peak electricity consumption, air is used to heat the high-pressure liquid refrigerant in the gas tank, causing it to vaporize and expand to drive the device, and then water working fluid is added to the gas tank to complete energy release. For example, during peak electricity consumption, the air can be used to heat the gas tank 4, so that the high-pressure liquid refrigerant stored in the gas tank 4 is converted into a vapor-phase refrigerant, which is vaporized and expanded, and the water refrigerant in the gas tank 4 is pushed to flow to the drive device, so that the drive device generates electricity and reduces the electricity load. By converting the high-pressure liquid refrigerant in the gas tank 4 into a vapor-phase refrigerant and pushing the water refrigerant to generate electricity, the electricity obtained from the power grid can be directly reduced, thereby reducing the load on the power grid; by controlling the air flow entering the gas tank 4, the expansion rate of the liquid refrigerant can be controlled. After the liquid refrigerant in the gas tank 4 is completely expanded into the vapor phase, the water refrigerant is filled into the gas tank 4, and the low-pressure vapor-phase refrigerant is discharged into the compression device 5. By controlling the liquid level and quality of the water refrigerant in the gas tank 4, when the water refrigerant level in the gas tank 4 reaches a preset value (this process is completed by sensor monitoring), water injection is stopped and the gas tank 4 completes energy release.

[0049] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A hydraulic compression energy storage system based on the transformation of a refrigeration system, characterized in that: include: A condenser (1), wherein the outlet end of the condenser (1) is connected to the inlet end of the evaporator (3) and the gas storage tank (4) respectively through a first pipeline, the outlet ends of the evaporator (3) and the gas storage tank (4) are connected to the inlet end of the compression device (5), a heat exchanger is provided outside the gas storage tank (4), the heat exchanger is a jacketed heat exchanger, and fins are provided between the gas storage tank (4) and the jacketed heat exchanger; The inlet end of the condenser (1) is connected to the outlet end of the compression device (5) through a second pipeline, the outlet end of the compression device (5) is connected to a driving device, the compression device (5) and the driving device are coaxially arranged, and the end of the driving device is connected to a water reservoir (9); The driving device is used to pump the water in the water reservoir (9).

2. The system according to claim 1, wherein: The working medium in the gas storage tank (4) is difluoromethane.

3. The system according to claim 1, wherein: The driving device comprises a generator (6) and a water supply pump (8), wherein the driving end of the generator (6) is connected to one end of the water supply pump (8), and the other end of the water supply pump (8) is connected to the water reservoir (9).

4. The system according to claim 3, characterized in that A transmission (7) is provided on the driving end of the generator (6).

5. The system according to claim 1, wherein: The driving device further comprises an electric motor and a water turbine, wherein the driving end of the electric motor is connected to one end of the water turbine, and the other end of the water turbine is connected to a water reservoir (9).

6. The system according to claim 1, wherein: The evaporator (3) is provided with an air inlet.

7. A method for operating a hydraulic compression energy storage system based on refrigeration system transformation, characterized in that: The method is performed using the system according to any one of claims 1 to 6, comprising: During the off-peak period of electricity consumption, the water feed pump is driven to pass the water working medium in the water reservoir into the gas storage tank, and the vapor phase refrigerant in the gas storage tank is sent to the compression device. The operating power of the driving device is controlled to increase the mass flow rate of the refrigerant in the compression device so that part of the liquid phase refrigerant passing through the condenser enters the gas storage tank for energy storage; During peak hours of electricity consumption, air is used to heat the high-pressure liquid refrigerant in the gas storage tank, so that the high-pressure liquid refrigerant vaporizes and expands, thereby operating the drive device.

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