Fuel cell auxiliary ground source heat pump combined type system and temperature adjusting system

Abstract

The utility model relates to the technical field of multi-energy systems, and discloses a fuel cell auxiliary ground source heat pump combined type system and a temperature adjusting system, and the system comprises a hydrogen fuel cell module, a geothermal energy module, a heat pump unit module and a tail end energy supply module. The system converts hydrogen energy into electric energy and heat energy through the hydrogen fuel cell module, and soil is filled with heat to maintain soil heat balance or assist the ground source heat pump to supply energy cooperatively. According to the system, cooperative energy supply is achieved through thermal coupling connection of the hydrogen fuel cell and the ground source heat pump, the electricity, heat and cold requirements of the load demand side with hydrogen energy and geothermal energy as main energy are met, the problem that renewable energy source supply and demand are not matched in seasons and daily scales can be solved, flexible combined heat and power generation is achieved, and the energy consumption is reduced. And on the premise of ensuring sustainable utilization of geothermal energy, carbon emission of the system can be eliminated, the cost is remarkably reduced, and excellent environmental and economic benefits are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of multi-energy system technology, specifically relating to a fuel cell-assisted ground source heat pump composite system and temperature regulation system. Background Technology

[0002] In recent years, the "dual carbon" target has placed higher demands on my country's low-carbon energy transition and the construction of a new energy system dominated by new energy sources. Given the current situation of huge annual carbon emissions during the heating season in northern my country, effectively utilizing renewable energy and adopting efficient energy supply equipment have become top priorities in promoting clean heating transformation in northern regions. Hydrogen energy is a highly efficient, clean, and green energy source with bidirectional hydrogen-to-electricity conversion characteristics. It can be produced through water electrolysis and stored or used according to energy supply and demand, thus mitigating the high volatility of wind and solar power. Hydrogen fuel cell technology is mature and can achieve effective combined heat and power (CHP). However, currently, the CHP coupling ratio of hydrogen fuel cells is relatively fixed, and the heat energy generated during the non-heating season to supply demand is not effectively utilized, resulting in heat energy waste.

[0003] Geothermal energy is stable and clean, and can be efficiently utilized through ground source heat pump technology. Ground source heat pumps have become a crucial building heating and cooling technology due to their excellent stability and efficiency. They use a small amount of electricity to drive the flow of a medium through buried pipes, exchanging energy with the soil. Compressor technology converts low-grade heat energy into high-grade heat energy, achieving efficient heat exchange between the primary and condensing sides, thus providing long-term, stable heating and cooling for buildings. Compared to water source and air source heat pumps, ground source heat pumps offer advantages such as high energy efficiency and high stability, and do not cause environmental pollution, aligning with the principles of green and sustainable development. However, currently, ground source heat pumps operating in northern regions face the problem of heat loads far exceeding cooling loads, leading to "cold accumulation" in the soil, causing soil temperature decay, resulting in the unsustainability of geothermal energy and a significant decrease in the energy efficiency of ground source heat pumps. Utility Model Content

[0004] To address the aforementioned issues, this invention provides a fuel cell-assisted ground source heat pump hybrid system. This system achieves hybrid operation by designing a thermal coupling connection between a hydrogen fuel cell and a ground source heat pump unit. Considering the insufficient utilization of the heat energy generated during hydrogen fuel cell power generation, and taking into account the adverse effects of soil "cold accumulation" caused by regional heat loads far exceeding cold loads on geothermal energy utilization efficiency, the system controls the valve group's state to switch the system's operating mode. Combined with hydrogen and water storage equipment, this allows for the effective use of the heat energy generated during fuel cell power generation to heat the ground source heat pump during the non-heating season, maintaining soil heat exchange balance. During the heating season, hydrogen energy and geothermal energy are used synergistically to achieve coordinated energy supply from the ground source heat pump and hydrogen fuel cell, resolving the supply-demand imbalance on seasonal and intraday scales, and enabling flexible combined heat and power generation.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a fuel cell-assisted ground source heat pump composite system, including a water storage tank, a fuel cell, a heat pump unit, and a buried pipe array; the outlet and inlet of the water storage tank are connected to the user; the outlet and inlet of the fuel cell are respectively connected to the user, the primary side of the heat pump unit, and the buried pipe array; the secondary side outlet and inlet of the heat pump unit are connected to the user; the primary side inlet and outlet of the heat pump unit are connected to the buried pipe array; the fuel cell is connected to a hydrogen source, and the hydrogen source uses renewable energy.

[0006] Furthermore, a first shut-off valve and a first circulating water pump are installed on the pipeline from the outlet of the water storage tank to the user, and a second shut-off valve is installed on the pipeline from the user to the inlet of the water storage tank.

[0007] Furthermore, the primary side of the heat pump unit is a condenser and the secondary side is an evaporator; or the primary side of the heat pump unit is an evaporator and the secondary side is a condenser, with a fifth shut-off valve and a second circulating water pump installed sequentially on the pipeline from the secondary side of the heat pump unit to the user, and a sixth shut-off valve installed on the pipeline from the user to the secondary side of the heat pump unit.

[0008] Furthermore, in the heat pump unit: the compressor, condenser, expansion valve and evaporator are connected in sequence, the evaporator is connected to the compressor; the evaporator is connected to the outlet and inlet of the fuel cell, the inlet and outlet of the condenser are connected to the user, and the evaporator is connected to the outlet and inlet of the buried pipe array.

[0009] Alternatively, the condenser can be connected to the inlet and outlet of the buried pipe array, while the evaporator's inlet and outlet can be connected to the user.

[0010] Furthermore, a third shut-off valve and a first circulating water pump are installed on the pipeline from the outlet of the fuel cell to the user, and a fourth shut-off valve is installed on the pipeline from the user to the inlet of the fuel cell; a seventh shut-off valve and an eighth shut-off valve are installed on the pipeline from the outlet of the fuel cell to the primary side of the heat pump unit and the pipeline from the primary side of the heat pump unit to the fuel cell, respectively; a third circulating water pump is also installed at the outlet of the fuel cell.

[0011] Furthermore, a ninth shut-off valve, an eleventh shut-off valve, and a fourth circulating water pump are sequentially installed on the pipeline from the underground pipe array to the primary side of the heat pump unit, and a tenth shut-off valve and a twelfth shut-off valve are installed on the pipeline from the primary side of the heat pump unit to the underground pipe array.

[0012] Furthermore, the power output of the fuel cell is connected to the power equipment of the circulation pump and heat pump unit via a substation.

[0013] Furthermore, multiple sets of water storage tanks, fuel cells, heat pump units, and underground pipe arrays are respectively installed.

[0014] Furthermore, in heating mode: the water storage tank provides hot water, the heat pump unit is in heating mode, the fuel cell is in heating and power supply mode, and the underground pipe array and fuel cell assist in heating the heat pump unit.

[0015] Alternatively, a water storage tank can provide hot water, the heat pump unit is in heating mode, the fuel cell is in both heating and power supply mode, and the underground pipe array can assist in heating the heat pump unit.

[0016] In cooling mode: the water storage tank provides cold water, the heat pump unit is in cooling mode, and the underground pipe array provides cooling for the heat pump unit.

[0017] Transitional operating conditions: The heat pump unit is in heating or cooling mode, and the fuel cell is in heating and power supply mode. Heat is stored in the underground pipe array through water.

[0018] This application may also provide a temperature regulation system that uses a fuel cell-assisted ground source heat pump composite system as described above to provide cooling and heating.

[0019] Compared with existing technologies, this utility model has at least the following beneficial effects: This utility model provides a fuel cell-assisted ground source heat pump hybrid system. By thermally coupling a hydrogen fuel cell with a ground source heat pump unit, it achieves synergistic energy supply from the hydrogen fuel cell and ground source heat pump hybrid system, realizing flexible combined heat and power (CHP), solving the problem of supply and demand mismatch on seasonal and intraday scales, and improving the energy supply efficiency of the energy system. In particular, during the non-heating season, the system injects the heat energy generated during hydrogen fuel cell power generation into the soil, avoiding heat energy waste. This design ensures the continuity of geothermal energy utilization, avoids the problem of ground source heat pump efficiency reduction caused by soil temperature decay, reduces system investment and operating costs, and significantly improves system operational stability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the circuit-hydrogen circuit of the fuel cell-assisted ground source heat pump composite system according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the HVAC component of a fuel cell-assisted ground source heat pump composite system according to an embodiment of the present invention.

[0022] Figure 3 This diagram illustrates the operating mode of the fuel cell-assisted ground source heat pump hybrid system according to an embodiment of the present invention during the heating season.

[0023] Figure 4 This is a diagram illustrating another operating mode of the fuel cell-assisted ground source heat pump composite system according to an embodiment of this utility model during the heating season.

[0024] Figure 5 This diagram illustrates the operating mode of the fuel cell-assisted ground source heat pump hybrid system according to an embodiment of the present invention during the cooling season.

[0025] Figure 6 This diagram illustrates the operating mode of the fuel cell-assisted ground source heat pump hybrid system according to an embodiment of this utility model during the transitional season; Explanation of reference numerals:

[0026] In the attached diagram, 1-first shut-off valve; 2-second shut-off valve; 3-third shut-off valve; 4-fourth shut-off valve; 5-first circulating water pump; 6-second circulating water pump; 7-fifth shut-off valve; 8-sixth shut-off valve; 9-heat pump unit; 10-expansion valve; 11-compressor; 12-third circulating water pump; 13-seventh shut-off valve; 14-eighth shut-off valve; 15-fourth circulating water pump; 16-ninth shut-off valve; 17-tenth shut-off valve; 18-eleventh shut-off valve; 19-twelfth shut-off valve; 20-buried pipe array; 21-condenser; 22-evaporator; 23-fuel cell; 24-water storage tank. Detailed Implementation

[0027] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of this utility model. It should be understood that this disclosure can be implemented in various ways and should not be limited to the illustrative embodiments provided herein.

[0028] Example 1

[0029] Reference Figure 1 and Figure 2This utility model provides a fuel cell-assisted ground source heat pump hybrid system, including a fuel cell, a heat pump unit, a water tank, a geothermal well, a water pump, valves, and a substation. The water tank can contain either cold or hot water. The fuel cell uses combined heat and power (CHP) technology to consume hydrogen energy to generate electricity and heat. The hydrogen energy used can be obtained from the hydrogen market or produced from renewable energy sources, effectively improving the cleanliness of the energy supply from the fuel cell-assisted ground source heat pump hybrid system. The heat pump unit interacts with the geothermal well, and through compressor technology, it delivers heat energy from the building space to the geothermal well in cooling mode and geothermal energy to the building space in heating mode, achieving efficient heating and cooling. The water tank (cold and hot) stores heat energy in the form of hot water and cooling energy in the form of cold water to supply the heating and cooling needs of the system's terminals. The geothermal well interacts with the soil and the heat pump unit through an array of buried pipes, realizing the utilization of geothermal energy and improving the cleanliness of the system's energy supply. Water pumps provide power to each water circulation loop; valves are used to control the flow distribution of each water circulation loop; substations are used to interact with the power grid and distribute power to various devices.

[0030] In the system's circuit connection, the fuel cell can generate electrical energy and transmit it to the substation to supply power to the system's internal and terminal components. The substation interacts with the power grid, and the system can purchase electricity during off-peak hours.

[0031] In the hydrogen circuit connection of the system, the hydrogen energy of this system can be obtained through the hydrogen market or produced through renewable energy sources to provide hydrogen energy for fuel cells.

[0032] Example 2

[0033] Reference Figure 3 This invention describes a working mode of the fuel cell-assisted ground source heat pump composite system during the heating season. This mode is suitable for use during the heating season when geothermal energy is insufficient and the system's terminal heat demand is high. In heating mode, the medium flow inside the heat pump unit 9 absorbs heat in the evaporator 22 near the geothermal well 20, and is converted into a high-temperature, high-pressure gaseous state by the compressor 11. Heat is released at the condenser 21 to the user-side water pipe, and then becomes a low-temperature, low-pressure liquid state through the expansion valve 10, entering the next cycle. The fuel cell 23 consumes hydrogen energy to generate electricity and heat energy. The heat energy is transferred through a circulation loop, where it is used together with the buried pipe array 20 to provide heat to the primary side of the heat pump unit, thereby increasing the heat exchange temperature of the primary side of the heat pump unit 9 and improving the energy supply efficiency of the heat pump unit 9 to meet the terminal heating load demand. In this mode, the fuel cell 23 assists the geothermal well 20 in providing heat to the primary side of the heat pump. The water circulation loop connection method is as follows:

[0034] In this mode, the system has four water circulation loops in use simultaneously. The water circulation mode and flow rate are controlled by controlling the on / off status of the first shut-off valve 1, the second shut-off valve 2, the fifth shut-off valve 7, the sixth shut-off valve 8, the seventh shut-off valve 13, the eighth shut-off valve 14, the ninth shut-off valve 16, the tenth shut-off valve 17, the eleventh shut-off valve 18, and the twelfth shut-off valve 19, as well as the power of the first circulating water pump 5, the second circulating water pump 6, the third circulating water pump 12, and the fourth circulating water pump 15.

[0035] The four water circulation loops are as follows:

[0036] Loop 1: The hot water in the storage tank, which is at a higher temperature, passes through the first shut-off valve 1 and the first circulating water pump 5 in sequence under the drive of the first circulating water pump 5. After exchanging heat with the building space and cooling down at the end of the system, it returns to the storage tank through the second shut-off valve 2. That is, the heat stored in the storage tank is used for peak shaving and valley filling. When the load is low, the heat in the storage tank is stored, and when the load is high, the heat stored in the storage tank is used to supply heat to the terminal.

[0037] Loop 2: The water that has been heated by heat exchange with the heat pump unit 9 on the condenser side 21 of the heat pump unit 9, driven by the second circulating water pump 6, passes through the fifth shut-off valve 7 and the second circulating water pump 6 in sequence to exchange heat with the system terminal and cool down. Then it passes through the sixth shut-off valve 8 to re-enter the next water circulation. That is, the heat pump unit 9 provides heating for the system terminal.

[0038] Loop 3: The hydrogen fuel cell 23 consumes hydrogen to generate heat energy to heat the water in the pipeline. Driven by the third circulating water pump 12, the water passes through the third circulating water pump 12 and the seventh shut-off valve 13 in sequence to reach the primary side of the heat pump unit 9. After providing heat to the primary side of the heat pump unit 9 and cooling down, the water passes through the eighth shut-off valve 14 and returns to the fuel cell to enter the next cycle. That is, the heat generated by the hydrogen fuel cell provides heat to the primary side of the heat pump unit 9.

[0039] Loop 4: In the buried pipe array 20, water that absorbs geothermal energy and heats up is driven by the fourth circulating water pump 15. Water exiting through the ninth and eleventh shut-off valves 16 and 18, after passing through the fourth circulating water pump 15, reaches the primary side of the heat pump unit 9, transferring heat energy to it. After its temperature decreases, water enters the buried pipe array 20 through the tenth and twelfth shut-off valves 17 and 19, re-entering the buried pipe array 20 to exchange heat with the soil, entering the next cycle. In other words, geothermal energy is transferred to provide heat to the primary side of the heat pump unit 9.

[0040] Example 3:

[0041] Reference Figure 4The figure shows another operating mode of the fuel cell-assisted ground source heat pump hybrid system during the heating season. This mode is suitable for the heating season when the system's terminal heat demand is high. The heat pump unit 9 is in heating mode, and the internal medium absorbs heat in the evaporator 22 near the geothermal well. This heat is then converted into a high-temperature, high-pressure gaseous state by the compressor 11, releasing heat to the user side at the condenser 21. After passing through the expansion valve 10, it becomes a low-temperature, low-pressure liquid state and enters the next cycle. The fuel cell 23 consumes hydrogen energy to generate electricity and heat energy. The heat energy is used to work with the heat pump unit 9 to directly provide heat energy to the system's terminal, meeting the heating load demand. The heat energy is transferred through water circulation. In this mode, the fuel cell 23 mainly supplies the system's terminal heat demand directly by generating heat energy, assisting the heat pump unit 9 in heating. The water circulation loop connection is as follows:

[0042] In this operating mode, the system also mainly uses four water circulation loops simultaneously. The water circulation mode and flow rate are controlled by controlling the on / off status of the first shut-off valve 1, the second shut-off valve 2, the third shut-off valve 3, the fourth shut-off valve 4, the fifth shut-off valve 7, the sixth shut-off valve 8, the ninth shut-off valve 16, the tenth shut-off valve 17, the eleventh shut-off valve 18, and the twelfth shut-off valve 19, as well as the power of the first circulating water pump 5, the second circulating water pump 6, the third circulating water pump 12, and the fourth circulating water pump 15.

[0043] The four water circulation loops are as follows:

[0044] Loop 1: The hot water in the storage tank, which is at a higher temperature, passes through the first shut-off valve 1 and the first circulating water pump 5 in sequence under the drive of the first circulating water pump 5. After exchanging heat with the building space and cooling down at the end of the system, it returns to the storage tank through the second shut-off valve 2. That is, the hot water in the storage tank 24 is used to provide heating at the end of the system.

[0045] Loop 2: The water that has been heated by heat exchange with the heat pump unit 9 on the condenser side of the heat pump unit 9, driven by the second circulating water pump 6, passes through the fifth shut-off valve 7 and the second circulating water pump 6 in sequence to exchange heat with the system terminal and cool down. Then it passes through the sixth shut-off valve 8 to re-enter the next water circulation. That is, the heat pump unit 9 provides heating for the system terminal.

[0046] Loop 3: In this mode, the hydrogen fuel cell 23 consumes hydrogen to generate heat to heat the water in the pipeline. Driven by the third circulating water pump 12, the water passes through the third circulating water pump 12, the third shut-off valve 3 and the first circulating water pump 5 in sequence to reach the end of the system. After providing heat to the end of the system and cooling down, the water passes through the fourth shut-off valve 4 and returns to the fuel cell to enter the next cycle. That is, the heat generated by the hydrogen fuel cell 23 directly supplies the heat demand at the end of the system.

[0047] Loop 4: In the buried pipe array 20, water that absorbs geothermal energy and heats up is driven by the fourth circulating water pump 15. Water exiting through the ninth and eleventh shut-off valves 16 and 18, after passing through the fourth circulating water pump 15, reaches the primary side of the heat pump unit 9, transferring heat energy to it. After its temperature decreases, water enters the buried pipe array 20 through the tenth and twelfth shut-off valves 17 and 19, re-entering the buried pipe array 20 to exchange heat with the soil, entering the next cycle. In other words, geothermal energy is transferred to provide heat to the primary side of the heat pump unit 9.

[0048] Example 4:

[0049] Reference Figure 5 The operating mode of the fuel cell-assisted ground source heat pump hybrid system during the cooling season is shown in the figure. This mode is suitable for providing cooling energy to the system's terminal during the cooling season. At this time, the heat pump unit 9 is in cooling mode. The internal medium absorbs heat in the evaporator 22 near the user side and is converted into a high-temperature, high-pressure gaseous state by the compressor 11. Heat is released at the condenser 21 to the buried pipe array 20, and then it becomes liquid through the expansion valve 10, entering the next cycle. This transfers the heat energy from the system's terminal to the geothermal well for cooling. The heat energy is transferred through the circulation loop. In this mode, the fuel cell 23 does not participate in the cooling operation of the ground source heat pump. The connection method of the water circulation loop is as follows:

[0050] In this operating mode, the system mainly uses three water circulation loops simultaneously. The water circulation mode and flow rate are controlled by controlling the on / off status of the first shut-off valve 1, the second shut-off valve 2, the fifth shut-off valve 7, the sixth shut-off valve 8, the ninth shut-off valve 16, the tenth shut-off valve 17, the eleventh shut-off valve 18, and the twelfth shut-off valve 19, as well as the power of the first circulating water pump 5, the second circulating water pump 6, and the fourth circulating water pump 15.

[0051] The three water circulation loops are:

[0052] Loop 1: The cool water in the water storage tank 24, driven by the first circulating water pump 5, passes sequentially through the first shut-off valve 1 and the first circulating water pump 5. After exchanging heat with the building space at the end of the system and being heated, it flows into the water storage tank 24 through the second shut-off valve 2. That is, the cool water in the water storage tank 24 is used to supply cooling to the end of the system.

[0053] Loop 2: Water that has been cooled after heat exchange with the evaporator 22 of the heat pump unit 9 in the user-side pipeline, is driven by the second circulating water pump 6 and passes through the fifth shut-off valve 7 and the second circulating water pump 6 in sequence to exchange heat with the system terminal and be heated. Then it passes through the sixth shut-off valve 8 to re-enter the next water circulation. That is, the heat pump unit provides cooling for the system terminal.

[0054] Loop 3: The water in the buried pipe array 20 exchanges heat with the soil and releases heat to cool down. Driven by the fourth circulating water pump 15, the water exits through the ninth shut-off valve 16 and the eleventh shut-off valve 18. After passing through the fourth circulating water pump 15, the water reaches the condenser 21 side of the heat pump unit 9 to absorb heat and heat up. Then, the water enters through the tenth shut-off valve 17 and the twelfth shut-off valve 19 and re-enters the buried pipe array 20. After exchanging heat with the soil, it is cooled down and enters the next cycle, realizing the injection of heat energy at the end of the system into the ground.

[0055] Example 5:

[0056] Reference Figure 6 The operating mode of the fuel cell-assisted ground source heat pump hybrid system during the transition season is shown in the figure. This mode is suitable for using the heat energy generated during the power generation of the hydrogen fuel cell to heat the soil during the transition season, maintaining the soil's heat exchange balance, and avoiding the problems of heat energy waste and "cold accumulation" that lead to a decrease in the efficiency of the ground source heat pump. The heat energy generated by the hydrogen fuel cell 23 interacts with the soil through pipes via the buried pipe array 20. The connection method of the water circulation loop is as follows:

[0057] During the transition season, the heating and cooling demand at the system's end is not significant. Under this operating condition, the water circulation loop is mainly controlled by adjusting the on / off states of the seventh shut-off valve 13, the eighth shut-off valve 14, the ninth shut-off valve 16, the tenth shut-off valve 17, the eleventh shut-off valve 18, and the twelfth shut-off valve 19, as well as the power of the third circulating water pump 12 and the fourth circulating water pump 15. When the hydrogen fuel cell generates electricity, the electrical energy coupled to heat the water in the pipeline, the water is then driven by the third and fourth circulating water pumps 12 and 15. Water then enters through the seventh shut-off valve 13 and the fourth circulating water pump 15, and flows into the buried pipe array 20. After injecting heat energy into the soil to cool it down, the water exits through the tenth shut-off valve 17 and the twelfth shut-off valve 19, passes through the eighth shut-off valve 14, and returns to the fuel cell, completing one heating cycle. This allows the waste heat coupled from the fuel cell's electricity generation to heat the soil during the transition season.

Claims

1. A fuel cell-assisted ground source heat pump hybrid system, characterized in that, The system includes a water tank (24), a fuel cell (23), a heat pump unit (9), and a buried pipe array (20); the outlet and inlet of the water tank (24) are connected to the user; the outlet and inlet of the fuel cell (23) are respectively connected to the user, the primary side of the heat pump unit (9), and the buried pipe array (20); the outlet and inlet of the secondary side of the heat pump unit (9) are connected to the user; the inlet and outlet of the primary side of the heat pump unit (9) are connected to the buried pipe array (20); the fuel cell (23) is connected to a hydrogen source, and the hydrogen source uses renewable energy; the primary side of the heat pump unit (9) is a condenser (21), and the secondary side is an evaporator (22); or the heat pump unit (9) The primary side of the heat pump unit (9) is the evaporator (22), and the secondary side is the condenser (21). A fifth shut-off valve (7) and a second circulating water pump (6) are installed in sequence on the pipeline from the secondary side of the heat pump unit (9) to the user. A sixth shut-off valve (8) is installed on the pipeline from the user to the secondary side of the heat pump unit (9). In the heat pump unit (9): the compressor (11), condenser (21), expansion valve (10) and evaporator (22) are connected in sequence. The evaporator (22) is connected to the compressor (11). The evaporator (22) is connected to the outlet and inlet of the fuel cell (23). The inlet and outlet of the condenser (21) are connected to the user. The evaporator (22) is connected to the outlet and inlet of the buried pipe array (20). Alternatively, the condenser (21) is connected to the outlet and inlet of the buried pipe array (20), and the inlet and outlet of the evaporator (22) are connected to the user.

2. The fuel cell-assisted ground source heat pump composite system according to claim 1, characterized in that, A first shut-off valve (1) and a first circulating water pump (5) are installed on the pipeline from the outlet of the water storage tank (24) to the user, and a second shut-off valve (2) is installed on the pipeline from the user to the inlet of the water storage tank.

3. The fuel cell-assisted ground source heat pump composite system according to claim 1, characterized in that, A third shut-off valve (3) and a first circulating water pump (5) are installed on the pipeline from the outlet of the fuel cell (23) to the user, and a fourth shut-off valve (4) is installed on the pipeline from the user to the inlet of the fuel cell (23); a seventh shut-off valve (13) and an eighth shut-off valve (14) are installed on the pipeline from the outlet of the fuel cell (23) to the primary side of the heat pump unit (9) and the pipeline from the primary side of the heat pump unit (9) to the fuel cell, respectively; a third circulating water pump (12) is also installed at the outlet of the fuel cell (23).

4. The fuel cell-assisted ground source heat pump composite system according to claim 1, characterized in that, The ninth shut-off valve (16), the eleventh shut-off valve (18) and the fourth circulating water pump (15) are installed sequentially on the pipeline from the underground pipe array (20) to the primary side of the heat pump unit (9). The tenth shut-off valve (17) and the twelfth shut-off valve (19) are installed on the pipeline from the primary side of the heat pump unit (9) to the underground pipe array (20).

5. The fuel cell-assisted ground source heat pump composite system according to claim 1, characterized in that, The power output of the fuel cell is connected to the circulating pump and heat pump unit via a substation.

6. The fuel cell-assisted ground source heat pump composite system according to claim 1, characterized in that, Multiple sets of water storage tank (24), fuel cell (23), heat pump unit (9) and underground pipe array (20) are respectively installed.

7. The fuel cell-assisted ground source heat pump composite system according to claim 1, characterized in that, In heating mode: the water storage tank (24) provides hot water, the heat pump unit (9) is in heating mode, the fuel cell (23) is in heating and power supply mode, and the underground pipe array (20) and fuel cell (23) assist in heating the heat pump unit (9); Alternatively, a water storage tank (24) provides hot water, the heat pump unit (9) is in heating mode, the fuel cell (23) is in heating and power supply mode, and the underground pipe array (20) assists in heating the heat pump unit (9); In cooling mode: the water storage tank (24) provides cold water, the heat pump unit (9) is in cooling mode, and the underground pipe array (20) provides cooling for the heat pump unit (9); Transitional operating condition: The heat pump unit (9) is in heating or cooling mode, the fuel cell (23) is in heating and power supply mode, and the heat is stored in the underground pipe array (20) through water.

8. A temperature control system, characterized in that, The fuel cell-assisted ground source heat pump composite system as described in any one of claims 1-7 is used to provide cooling and heating.

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