Cooling and heating system of photovoltaic thermal energy and phase change energy storage coupled with ground source heat pump

Abstract

This utility model relates to the field of circulating heating and cooling technology, specifically to a heating and cooling system that couples photovoltaic thermal energy and phase change energy storage with a ground source heat pump. By using a ground source heat pump unit, a chiller, and a phase change energy storage device, it breaks through the limitation of existing systems that can only provide heating, and simultaneously meets the needs of cooling and heating. By using photovoltaic thermal panels and phase change energy storage devices to assist the ground source heat pump system, it reduces the high-energy-consumption operation time of the main unit, makes full use of the energy generated by photovoltaic thermal panel technology, and reduces energy waste.

Description

Technical Field

[0001] This utility model relates to the field of circulating heating and cooling technology, specifically to a heating and cooling system that couples photovoltaic thermal energy and phase change energy storage with a ground source heat pump. Background Technology

[0002] Currently, photovoltaic / thermal (PV / T) technology and ground source heat pump technology are widely used in building heating. Photovoltaic / thermal (PV / T) technology combines photovoltaic power generation and solar thermal utilization, enabling the simultaneous generation of electricity and heat. Ground source heat pumps achieve efficient heating by exchanging heat with the soil through buried pipe heat exchangers.

[0003] However, photovoltaic thermal + ground source heat pump systems can usually only provide heating and cannot meet cooling needs. The ground source heat pump main unit needs to operate at high load frequently to meet the temperature requirements of the user side, resulting in high energy consumption. The energy generated by PV / T technology is not fully utilized and there is a waste. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a cooling and heating system that couples photovoltaic photothermal energy with phase change energy storage to a ground source heat pump, so as to overcome the problems existing in the current technology.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This application provides a cooling and heating system that couples photovoltaic thermal energy and phase change energy storage with a ground source heat pump, including: a photovoltaic thermal panel, a chiller, a phase change energy storage device, a buried pipe heat exchanger, a ground source heat pump unit, a circulating pump, and an inverter.

[0007] The power output terminal of the photovoltaic thermal panel is electrically connected to the inverter, and the output terminal of the inverter is electrically connected to the chiller, the ground source heat pump unit and the circulating pump respectively.

[0008] The chiller, the ground source heat pump unit, and the circulating pump are also connected to an external power grid.

[0009] The heat energy end of the photovoltaic thermal panel is connected to the phase change energy storage device through a pipeline. The phase change energy storage device and the photovoltaic thermal panel form a first circulation pipeline. The phase change energy storage device is also connected to the chiller to form a second circulation pipeline. The main outlet and main inlet of the phase change energy storage device are connected to the ground source side circulation pipeline to form a third circulation pipeline. The ground source heat pump unit is connected to the buried pipe heat exchanger to form a fourth circulation pipeline. The phase change energy storage device is connected to the buried pipe heat exchanger to form a fifth circulation pipeline. The ground source heat pump unit is also connected to user-side equipment to form a sixth circulation pipeline.

[0010] The circulation pump is installed on the first circulation pipeline, the fourth circulation pipeline, the fifth circulation pipeline and the sixth circulation pipeline respectively.

[0011] Furthermore, the system described above also includes: a rectifier and an energy storage battery;

[0012] The rectifier is electrically connected to the energy storage battery, the rectifier is also electrically connected to the inverter, and the inverter is also electrically connected to the external power grid.

[0013] Furthermore, in the system described above, the phase change energy storage device includes: a heating phase change module and a cooling phase change module;

[0014] The inlet of the internal coil of the heating phase change module is connected to the heat output end of the photovoltaic thermal plate, and the outlet of the internal coil of the heating phase change module is connected to the heat recovery end of the photovoltaic thermal plate, forming the first circulation pipeline;

[0015] The inlet of the internal coil of the refrigeration phase change module is connected to the outlet of the refrigerator, and the outlet of the internal coil of the refrigeration phase change module is connected to the inlet of the refrigerator, forming the second circulation pipeline;

[0016] One end of the main inlet and outlet water pipes of the phase change energy storage device is connected to the upper and lower three-way solenoid valves, and the other end is connected to the return water pipe of the ground source heat pump unit, forming a circulation loop.

[0017] Furthermore, in the system described above, the heating phase change module is filled with a phase change material at a high temperature phase change temperature point, and the cooling phase change module is filled with a phase change material at a low temperature phase change temperature point.

[0018] Furthermore, in the system described above, a pressure sensor and a temperature sensor are installed on the first circulation pipeline.

[0019] Furthermore, in the system described above, a pressure sensor and a temperature sensor are installed on the third circulation pipeline.

[0020] Furthermore, in the system described above, a pressure sensor and a temperature sensor are installed on the fourth circulation pipeline.

[0021] Furthermore, in the system described above, a pressure sensor and a temperature sensor are installed on the fifth circulation pipeline.

[0022] Furthermore, in the system described above, a pressure sensor and a temperature sensor are installed on the sixth circulation pipeline.

[0023] The beneficial effects of this utility model are as follows:

[0024] 1. High efficiency and energy saving: Through the synergistic effect of phase change energy storage devices and photovoltaic thermal panels, the system can significantly reduce the energy consumption of the ground source heat pump main unit in both cooling and heating modes. Excess electricity generated by the photovoltaic thermal panels can be stored in energy storage batteries, further improving the system's energy utilization efficiency.

[0025] 2. Functional expansion: The system can not only achieve efficient cooling and heating, but also release the stored heat energy into the ground during the non-heating season using a phase change energy storage device to maintain the underground heat balance, thereby extending the service life of the ground source heat pump system.

[0026] 3. Intelligent control: The system is equipped with an intelligent control system that can automatically adjust the operating mode according to real-time temperature and user needs to ensure efficient and stable operation of the system.

[0027] 4. Reduced dependence on the power grid: The electricity generated by photovoltaic thermal panels is used primarily for system operation, and excess electricity is stored in energy storage batteries, reducing dependence on the traditional power grid and lowering operating costs. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a cooling and heating system of a ground source heat pump coupled with photovoltaic photothermal and phase change energy storage according to an embodiment of the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] Figure 1 This is a schematic diagram of a cooling and heating system of a ground source heat pump coupled with photovoltaic photothermal and phase change energy storage according to an embodiment of the present invention. Figure 11 is a photovoltaic thermal panel, 2 is a chiller, 3 is a phase change energy storage device, 4 is a buried pipe heat exchanger, 5 is a ground source heat pump main unit system, 6 is an inverter, 7 is a rectifier, 8 is a bidirectional meter, 9 is an energy storage battery, 10 is an indoor heating terminal, and 11 is the power grid. T1 is the temperature sensor for the first circulation pipeline, T2 is the temperature sensor for the fourth circulation pipeline, T3 is the temperature sensor for the sixth circulation pipeline, T4 is the temperature sensor for the third circulation pipeline, T5 is the thermometer for the first circulation pipeline, T6 is the thermometer for the fourth circulation pipeline, T7 is the thermometer for the third circulation pipeline, T8 and T9 are the temperature sensors for the fifth circulation pipeline, T10 is the internal temperature sensor for the heating phase change module, and T11 is the internal temperature sensor for the cooling phase change module. V1 is the pressure sensor for the first circulation pipeline, V2 is the pressure sensor for the fourth circulation pipeline, V3 is the pressure sensor for the sixth circulation pipeline, V4 is the pressure sensor for the third circulation pipeline, V5 is the voltmeter between the photovoltaic thermal panel and the inverter, V6 is the voltmeter between the energy storage battery and the inverter, V7 and V8 are the pressure sensors for the fifth circulation pipeline, B1 is the circulation pump for the first circulation pipeline, B2 is the circulation pump for the fourth circulation pipeline, B3 is the circulation pump for the sixth circulation pipeline, and B4 is the circulation pump for the fifth circulation pipeline.

[0032] F1 is the electric valve between the photovoltaic thermal panel and the domestic water supply; F2, F3, and F4 are the electric valves of the fourth circulation pipeline; F5 and F6 are the electric valves of the sixth circulation pipeline; F7 is the electric valve of the third circulation pipeline; F8 is the three-way solenoid valve at the main inlet of the phase change energy storage device; F9 is the three-way solenoid valve at the main outlet of the phase change energy storage device; and F10 and F11 are the electric valves of the fifth circulation pipeline.

[0033] Please see Figure 1 This embodiment may include:

[0034] Photovoltaic thermal panels, chillers, phase change energy storage devices, buried pipe heat exchangers, ground source heat pump units, circulating pumps and inverters;

[0035] The power output terminal of the photovoltaic thermal panel is electrically connected to the inverter, and the output terminal of the inverter is electrically connected to the chiller, the ground source heat pump unit and the circulating pump respectively.

[0036] The chiller, ground source heat pump unit, and circulating pump are also connected to the external power grid.

[0037] The heat energy end of the photovoltaic thermal panel is connected to the phase change energy storage device through pipelines. The phase change energy storage device and the photovoltaic thermal panel form the first circulation pipeline. The phase change energy storage device is also connected to the chiller to form the second circulation pipeline. The main outlet and main inlet of the phase change energy storage device are connected to the ground source side circulation pipeline to form the third circulation pipeline. The ground source heat pump unit is connected to the buried pipe heat exchanger to form the fourth circulation pipeline. The phase change energy storage device is connected to the buried pipe heat exchanger to form the fifth circulation pipeline. The ground source heat pump unit is also connected to user-side equipment to form the sixth circulation pipeline.

[0038] The first, fourth, fifth, and sixth circulation pipelines are each equipped with a circulation pump.

[0039] It should be noted that the heat output end of the photovoltaic thermal panel is connected via a pipe to the inlet of the internal coil of the heating phase change module of the phase change energy storage device. The outlet of the internal coil of the heating phase change module of the phase change energy storage device is connected to the heat recovery end of the photovoltaic thermal panel. A circulation pump is installed on the heat output pipeline of the photovoltaic thermal panel to drive the heat transfer medium (such as water or antifreeze) to circulate between the photovoltaic thermal panel and the heating phase change module of the phase change energy storage device. Pressure and temperature sensors are installed on the circulation pipeline to monitor the pressure and temperature of the heat transfer medium to ensure effective heat transfer.

[0040] The inlet of the internal coil of the phase change energy storage device's refrigeration phase change module is connected to the outlet of the refrigeration unit, and the outlet of the coil is connected to the inlet of the refrigeration unit.

[0041] The ground source side outlet of the ground source heat pump unit is connected to the inlet of the buried pipe heat exchanger via a pipe. The outlet of the buried pipe heat exchanger is connected to the ground source side return outlet of the ground source heat pump unit via a pipe. A circulation pump is installed on the pipe between the outlet of the buried pipe heat exchanger and the ground source side return outlet of the ground source heat pump unit to drive the ground source side circulating water to circulate between the ground source heat pump unit and the buried pipe heat exchanger. Pressure and temperature sensors are installed on the circulation pipe to monitor the pressure and temperature of the ground source side circulating water to ensure effective heat exchange.

[0042] The user-side outlet of the ground source heat pump system is connected to the inlet of the indoor energy supply terminals (such as radiators and fan coil units) via pipes. The outlet of the indoor energy supply terminals is connected to the user-side return outlet of the ground source heat pump system via pipes. A circulation pump is installed on the pipes connecting the user-side outlet of the ground source heat pump system and the inlet of the indoor energy supply terminals to circulate the user-side circulating water between the ground source heat pump system and the indoor energy supply terminals. Pressure and temperature sensors are installed on the circulation pipes to monitor the pressure and temperature of the user-side circulating water, ensuring that the user's temperature requirements are met.

[0043] The phase change energy storage device is equipped with a main inlet pipe and a main outlet pipe, which are connected to the ground source side circulation pipe to form a loop. Three-way solenoid valves are installed on the main inlet and outlet pipes to switch the water flow direction between cooling and heating modes. Cooling mode: The heating phase change module channel is closed via the three-way solenoid valve, allowing the ground source side circulating water to be cooled only through the cooling phase change module. Heating mode: The cooling phase change module channel is closed via the three-way solenoid valve, allowing the ground source side circulating water to be heated only through the heating phase change module. Pressure and temperature sensors are installed on the circulation pipes to monitor the pressure and temperature of the ground source side circulating water, ensuring the effective operation of the phase change energy storage device.

[0044] The heating phase change module is designed with independent heat output and independent heat recovery terminals. The buried pipe heat exchanger is also designed with independent heat output and independent heat input terminals. The independent heat output terminal of the heating phase change module is connected to the independent heat input terminal of the buried pipe heat exchanger. The independent heat output terminal of the buried pipe heat exchanger is connected to the independent heat recovery terminal of the heating phase change module. A circulation pump is installed on the heat output pipeline of the heating phase change module to circulate the heat medium between the heating phase change module and the buried pipe heat exchanger. Pressure and temperature sensors are installed on the circulation pipeline to detect the pressure and temperature of the heat medium, ensuring effective heat release.

[0045] Preferably, it also includes: a rectifier and an energy storage battery;

[0046] The rectifier is electrically connected to the energy storage battery, the rectifier is also electrically connected to the inverter, and the inverter is also electrically connected to the external power grid.

[0047] Understandably, the rectifier is electrically connected to the inverter, and the rectifier is also electrically connected to the energy storage battery. This allows excess electricity to be stored, and when the system's power is insufficient, the energy stored in the battery can be used to power the system first. If there is still excess energy, it can be fed into the grid. Simultaneously, the inverter is also electrically connected to the external grid, allowing the energy storage battery to be charged during off-peak electricity periods.

[0048] Preferably, the phase change energy storage device includes: a heating phase change module and a cooling phase change module;

[0049] The inlet of the internal coil of the heating phase change module is connected to the heat output end of the photovoltaic thermal plate, and the outlet of the internal coil of the heating phase change module is connected to the heat recovery end of the photovoltaic thermal plate, forming the first circulation pipeline.

[0050] The inlet of the internal coil of the refrigeration phase change module is connected to the outlet of the refrigeration unit, and the outlet of the internal coil of the refrigeration phase change module is connected to the inlet of the refrigeration unit, forming a second circulation pipeline;

[0051] One end of the main inlet and outlet water pipes of the phase change energy storage device is connected to the upper and lower three-way solenoid valves, and the other end is connected to the return water pipe of the ground source heat pump unit, forming a circulation loop.

[0052] Preferably, the heating phase change module is filled with a phase change material at a high temperature phase change temperature point, and the cooling phase change module is filled with a phase change material at a low temperature phase change temperature point.

[0053] Preferably, a pressure sensor and a temperature sensor are installed on the first circulation pipeline.

[0054] Preferably, a pressure sensor and a temperature sensor are installed on the third circulation pipeline.

[0055] Preferably, a pressure sensor and a temperature sensor are installed on the fourth circulation pipeline.

[0056] Preferably, a pressure sensor and a temperature sensor are installed on the fifth circulation pipeline.

[0057] Preferably, a pressure sensor and a temperature sensor are installed on the sixth circulation pipeline.

[0058] In practice, during the cold storage period, the phase change material inside the cooling phase change module is at a low-temperature phase change temperature point and is liquid at room temperature. The electricity generated by the photovoltaic thermal panel is used to cool the cooling phase change module via a chiller, causing the internal phase change material to solidify. This solidification process absorbs cold energy, achieving the cold storage effect. The completion of cold storage is determined by observing the data returned by the temperature sensor inside the cooling phase change module. During the cold storage period, the photovoltaic thermal panel absorbs solar energy and converts it into electricity. An inverter is used to cool the cooling phase change module and simultaneously power the ground source heat pump system. If solar power is insufficient, grid power is used; if there is sufficient and surplus solar power, a rectifier stores the electricity in a storage battery, and the inverter then powers the system for nighttime or cloudy days.

[0059] During the cooling release period, after the cooling phase change module completes its cold storage, it begins to operate. At this time, the water temperature in the ground source side circulation pipeline is higher than the internal temperature of the cooling phase change module. Therefore, the phase change material inside the cooling phase change module exchanges heat with the water exchanged through the buried pipe heat exchanger, lowering the temperature of the water exchanged through the buried pipe heat exchanger. The water in the ground source side circulation pipeline, now at a lower temperature, enters the ground source heat pump main unit for further cooling or is directly supplied to the user side for cooling and heat exchange. The heating phase change module channel is closed via a three-way solenoid valve to ensure that the ground source side circulating water is cooled only through the cooling phase change module.

[0060] During the heat storage period, the heating phase change module contains a phase change material at a high-temperature phase change temperature point, which is solid at room temperature. The heat generated by the photovoltaic thermal panel heats the heating phase change module, causing the phase change material inside to melt. This melting process absorbs heat, achieving a heat storage effect. The completion of heat storage is determined by observing the data returned by the temperature sensor inside the heating phase change module. During the heat storage period, the water temperature from the buried pipe heat exchanger is too low to meet the user's needs and must be heated by the ground source heat pump system. At this time, the electricity generated by the photovoltaic thermal panel provides power to the ground source heat pump system, reducing the grid load and electricity costs.

[0061] During the heat release period, once the heating phase change module has stored enough heat, it begins to operate. At this time, the water temperature in the ground source side circulation pipe is low, below the internal temperature of the heating phase change module. Therefore, the phase change material inside the heating phase change module exchanges heat with the water exchanged through the buried pipe heat exchanger, raising the temperature of the water exchanged through the buried pipe heat exchanger. The water temperature in the ground source side circulation pipe then rises, approaching or reaching the user's heating demand, and subsequently enters the ground source heat pump main unit system for reheating or direct heat supply to the user, thereby significantly reducing the main unit's energy consumption. The cooling phase change module channel is closed via a three-way solenoid valve, ensuring that the ground source side circulating water is heated only through the heating phase change module.

[0062] Temperature sensors are installed at key locations in the phase change energy storage device, the ground source-side circulation pipeline, and the user-side circulation pipeline to monitor the temperature status of each component in real time. The temperature sensors transmit real-time data to the central control system to determine whether the system needs to switch operating modes or adjust operating parameters.

[0063] When cooling is needed on the user side, the central control system determines whether to activate the cooling phase change module based on feedback from temperature sensors. If the cooling phase change module has completed cold storage, the system guides the ground source circulating water to the cooling phase change module for cooling via electric valves and three-way solenoid valves. The cooled water then enters the ground source heat pump main unit system for further temperature reduction or is directly delivered to the user side. If the cooling phase change module has not completed cold storage, the system directly guides the ground source circulating water to the ground source heat pump main unit system for cooling.

[0064] When heating is needed on the user side, the central control system determines whether the heating phase change module needs to be activated based on feedback from temperature sensors. If the heating phase change module has completed heat storage, the system guides the ground source circulating water to the heating phase change module for heating via electric valves and three-way solenoid valves. The heated water then enters the ground source heat pump main unit system for further temperature increase or is directly delivered to the user side. If the heating phase change module has not completed heat storage, the system directly guides the ground source circulating water to the ground source heat pump main unit system for heating.

[0065] The direct current generated by the photovoltaic thermal panel is first converted into alternating current by an inverter, which prioritizes powering the ground source heat pump system and other equipment.

[0066] When the power demand of the system equipment is low and there is surplus electricity generated by the photovoltaic thermal panel, the electricity generated by the photovoltaic thermal panel is stored in the energy storage battery through the inverter and rectifier.

[0067] On cloudy days or at night, when the power generated by the photovoltaic thermal panels is insufficient, the inverter converts the direct current in the energy storage battery into alternating current to power the system equipment.

[0068] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0069] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means at least two.

[0070] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the present invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order according to the functions involved, as should be understood by those skilled in the art to which embodiments of the present invention pertain.

[0071] It should be understood that the various parts of this utility model can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0072] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0073] Furthermore, the functional units in the various embodiments of this utility model can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0074] The storage media mentioned above can be read-only memory, disk, or optical disk, etc.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0076] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A photovoltaic photo-thermal and phase change energy storage coupled ground source heat pump refrigeration and heating system, characterized in that, include: Photovoltaic thermal panels, chillers, phase change energy storage devices, buried pipe heat exchangers, ground source heat pump units, circulating pumps and inverters; The power output terminal of the photovoltaic thermal panel is electrically connected to the inverter, and the output terminal of the inverter is electrically connected to the chiller, the ground source heat pump unit and the circulating pump respectively. The chiller, the ground source heat pump unit, and the circulating pump are also connected to an external power grid. The heat energy end of the photovoltaic thermal panel is connected to the phase change energy storage device through a pipeline. The phase change energy storage device and the photovoltaic thermal panel form a first circulation pipeline. The phase change energy storage device is also connected to the chiller to form a second circulation pipeline. The main outlet and main inlet of the phase change energy storage device are connected to the ground source side circulation pipeline to form a third circulation pipeline. The ground source heat pump unit is connected to the buried pipe heat exchanger to form a fourth circulation pipeline. The phase change energy storage device is connected to the buried pipe heat exchanger to form a fifth circulation pipeline. The ground source heat pump unit is also connected to the user-side equipment to form a sixth circulation pipeline. The circulation pump is installed on the first circulation pipeline, the fourth circulation pipeline, the fifth circulation pipeline and the sixth circulation pipeline respectively.

2. The system of claim 1, wherein, Also includes: Rectifiers and energy storage batteries; The rectifier is electrically connected to the energy storage battery, the rectifier is also electrically connected to the inverter, and the inverter is also electrically connected to the external power grid.

3. The system of claim 2, wherein, The phase change energy storage device includes: a heating phase change module and a cooling phase change module; The inlet of the internal coil of the heating phase change module is connected to the heat output end of the photovoltaic thermal plate, and the outlet of the internal coil of the heating phase change module is connected to the heat recovery end of the photovoltaic thermal plate, forming the first circulation pipeline; The inlet of the internal coil of the refrigeration phase change module is connected to the outlet of the refrigerator, and the outlet of the internal coil of the refrigeration phase change module is connected to the inlet of the refrigerator, forming the second circulation pipeline; One end of the main inlet and outlet water pipes of the phase change energy storage device is connected to the upper and lower three-way solenoid valves, and the other end is connected to the return water pipe of the ground source heat pump unit, forming a circulation loop.

4. The system of claim 3, wherein, The heating phase change module is filled with phase change material at a high temperature phase change temperature point, and the cooling phase change module is filled with phase change material at a low temperature phase change temperature point.

5. The system of claim 4, wherein, A pressure sensor and a temperature sensor are installed on the first circulation pipeline.

6. The system of claim 5, wherein, The third circulation pipeline is equipped with a pressure sensor and a temperature sensor.

7. The system according to claim 6, characterized in that, A pressure sensor and a temperature sensor are installed on the fourth circulation pipeline.

8. The system according to claim 7, characterized in that, The fifth circulation pipeline is equipped with a pressure sensor and a temperature sensor.

9. The system according to claim 8, characterized in that, The sixth circulation pipeline is equipped with a pressure sensor and a temperature sensor.

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