Multi-source heat pump heating and cooling system

Abstract

The utility model discloses a multi-source heat pump heating and cooling system, which is applied to the field of building heating and cooling and comprises a solar heat collector, a buried pipe, a heat pump unit, a heat storage water tank, a user terminal, a water replenishing device, a cooling tower, a plate heat exchanger and a control system. The multi-source heat pump energy supply system is composed of a solar heat supply loop, a ground source heat pump heat supply / cold supply loop, a cooling tower cold supply loop and a recharge heat storage loop. Six operation modes including a solar heat supply mode, a solar and ground source heat pump combined heat supply mode, a ground source heat pump heat supply mode, a cooling tower cold supply mode, a cooling tower auxiliary ground source heat pump cold supply mode and a solar heat storage recharge mode under different working conditions can be achieved, various renewable energy sources are effectively utilized, heat supply in winter and cold supply in summer can be achieved, and the solar and ground source heat pump combined solar and ground source heat pump combined solar and ground source heat pump combined solar and ground source heat pump combined solar and ground source heat pump combined heat supply mode is achieved. In addition, soil heat balance is carried out through recharging in the transition season, and long-term sustainable operation of the system is guaranteed while the performance of the heat pump system is improved.

Description

Technical Field

[0001] The utility model relates to the field of building heating and cooling, in particular to a multi-source heat pump heating and cooling system. Background Art

[0002] With economic development, people's demands for a higher quality work and living environment are increasing, leading to a growing demand for energy in my country. Building operations account for one-fifth of national energy consumption, and heating and air conditioning in buildings consume a significant amount of energy, accounting for approximately half of this energy consumption. Therefore, in order to achieve carbon peak by 2030 and carbon neutrality by 2060, the development and utilization of renewable energy in building heating and cooling is crucial.

[0003] To reduce energy consumption and carbon emissions associated with regulating indoor temperatures, replacing traditional fossil energy with renewable energy sources, such as solar energy, dry air energy, and geothermal energy, is an effective approach to energy conservation, carbon reduction, and sustainable development in buildings. However, solar energy has low energy density, high volatility, and poor stability, making it impossible to provide heating on cloudy days, during dusty days, or at night. After years of operation, a single ground-source heat pump heating / cooling system will accumulate heat underground, leading to soil thermal imbalances and lower or higher soil temperatures. Ultimately, the performance of the ground-source heat pump system will deteriorate due to deviations in soil temperature from the original design value, ultimately leading to system failure. Combined heating and cooling ground-source heat pump systems can also cause soil thermal imbalances due to the climate of the building, necessitating the use of solar energy and cooling towers as supplementary or energy storage to maintain sustainable system operation. Utility Model Content

[0004] The present invention provides a multi-source heat pump system to solve the above-mentioned technical problems. The system effectively utilizes a variety of renewable energy sources. By adjusting different valves through the control system, it can achieve heating in winter and cooling in summer, compensating for the instability of solar heating. In addition, the performance of the heat pump system can be improved by balancing the soil temperature through recharge during the transition season.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A multi-source heat pump heating and cooling system includes: a solar collector, buried pipes, a heat pump unit, a hot water storage tank, a user terminal, a water replenishment device, a cooling tower, a plate heat exchanger and a control system.

[0007] Furthermore, the multi-source heat pump heating and cooling system consists of four circuits: a solar heating circuit, a ground source heat pump heating / cooling circuit, a cooling tower cooling circuit and a recharge heat storage circuit.

[0008] Furthermore, the solar collector, the heat storage tank and the user end are connected through the third circulating water pump and the fifth circulating water pump to form a solar heating circuit, and the solar heating circuit is provided with a first three-way valve, a third three-way valve, a fifth three-way valve, a sixth three-way valve, a seventh three-way valve and an eighth three-way valve.

[0009] Furthermore, the buried pipe, heat pump unit, hot water storage tank and user terminal are connected through the second circulating water pump, the fourth circulating water pump and the fifth circulating water pump to form a ground source heat pump heating / cooling circuit, and the ground source heat pump heating / cooling circuit is provided with a second three-way valve, a fourth three-way valve, a fifth three-way valve, a sixth three-way valve, a seventh three-way valve and an eighth three-way valve.

[0010] Furthermore, the cooling tower, the heat exchanger and the user terminal are connected through the seventh circulating water pump and the sixth circulating water pump to form a cooling tower cooling circuit, and the cooling tower cooling circuit is provided with a seventh three-way valve and an eighth three-way valve.

[0011] Furthermore, the solar collector and the buried pipe are connected through a first circulating water pump to form a heat storage and recharge loop, and the heat storage and recharge loop is provided with a first three-way valve, a second three-way valve, a third three-way valve and a fourth three-way valve.

[0012] Furthermore, temperature probes are installed at the water inlet, outlet and heat storage tank of the solar collector, which can monitor the temperature of the water in the water inlet, outlet and heat storage tank of the solar collector in real time and control the opening of the three-way valve according to the temperature.

[0013] Furthermore, the water replenishing device is connected to the cooling tower and can replenish water for the cooling tower.

[0014] Furthermore, the solar thermal collector is a flat-plate solar thermal collector, an all-glass vacuum tube solar thermal collector, or a metal-glass vacuum tube solar thermal collector.

[0015] Furthermore, the multi-source heat pump heating and cooling system has six operating modes, including solar heating mode, solar ground source heat pump combined heating mode, ground source heat pump heating mode, cooling tower cooling mode, cooling tower assisted ground source heat pump cooling mode, and heat storage and recharge mode.

[0016] Furthermore, during the heating season, when the outlet water temperature of the heat storage tank is higher than 48°C and lower than 65°C, the multi-source heat pump system is in solar heating mode. The operation process of the solar heating mode requires opening the third circulation pump, the fifth circulation pump, the first three-way valve, the third three-way valve, the seventh three-way valve and the eighth three-way valve. The solar collector transfers the heat absorbed by solar radiation to the heat storage tank, and the heat storage tank delivers the hot water to the user end.

[0017] Furthermore, during the heating season, when the outlet water temperature of the heat storage tank is less than 48°C, the multi-source heat pump system is a solar ground source heat pump combined heating mode. During the operation of the solar ground source heat pump combined heating mode, the solar collector and the heat pump unit jointly provide heat to the user end. On the basis of opening the third circulating water pump, the fifth circulating water pump, the first three-way valve, the third three-way valve, the seventh three-way valve and the eighth three-way valve, the second circulating water pump, the fourth circulating water pump, the second three-way valve, the fourth three-way valve, the fifth three-way valve and the sixth three-way valve must also be opened. The solar collector will transfer the heat absorbed by solar radiation to the heat storage tank, the heat pump unit will transfer the heat extracted from the buried pipe to the heat storage tank, and the heat storage tank will deliver the heat to the user end.

[0018] Furthermore, during the heating season, when the solar collector cannot work normally due to rainy weather, dust or night, the multi-source heat pump system is in a ground source heat pump heating mode. The operation process of the ground source heat pump heating mode requires turning on the second circulating water pump, the fourth circulating water pump, the fifth circulating water pump, the second three-way valve, the fourth three-way valve, the fifth three-way valve, the sixth three-way valve, the seventh three-way valve and the eighth three-way valve. The heat pump unit transfers the heat extracted from the buried pipe to the heat storage tank, and the heat storage tank delivers the hot water to the user end.

[0019] Furthermore, in the cooling season, when the cooling load is not large or the outdoor temperature is not high, the multi-source heat pump system is in the cooling tower cooling mode. The operation process of the cooling tower cooling mode requires turning on the seventh circulating water pump, the sixth circulating water pump, the seventh three-way valve and the eighth three-way valve. The cooling tower provides cold energy to the plate heat exchanger, and the plate heat exchanger sends the cold energy to the user end.

[0020] Furthermore, in the cooling season, when the cooling tower is insufficient to meet the cooling load or the outdoor temperature is too high, the multi-source heat pump system is a cooling tower assisted ground source heat pump cooling mode. During the operation of the cooling tower assisted ground source heat pump cooling mode, the cooling tower and the heat pump unit jointly provide cooling for the user end. On the basis of opening the seventh circulating water pump, the sixth circulating water pump, the seventh three-way valve and the eighth three-way valve, it is also necessary to open the second circulating water pump, the fourth circulating water pump, the fifth circulating water pump, the second three-way valve, the fourth three-way valve, the fifth three-way valve and the sixth three-way valve. The cooling tower provides cold energy to the plate heat exchanger, the plate heat exchanger sends the cold energy to the user end, the heat pump unit transfers the cold energy extracted from the buried pipe to the hot water storage tank, and the hot water storage tank sends the cold energy to the user end.

[0021] Furthermore, during the transition season, when the temperature difference between the inlet and outlet of the solar collector is greater than 2°C and less than 20°C, the multi-source heat pump system is in a heat storage and recharge mode. The heat storage and recharge mode requires opening the first circulating water pump, the first three-way valve, the second three-way valve, the third three-way valve and the fourth three-way valve, and the solar collector transfers the heat absorbed by solar radiation to the buried pipe.

[0022] After adopting the above technical solution, the utility model has the following advantages:

[0023] 1. The utility model can make full use of multiple renewable energy sources, overcome the limitations of single heat source heat pumps, and has very significant complementarity.

[0024] 2. This utility model has six operating modes for different usage scenarios, which can meet the heating and cooling needs of the building throughout the year. It has strong stability and is efficient, environmentally friendly and energy-saving.

[0025] 3. The utility model has a heat storage and recharge mode that can realize cross-seasonal energy storage, balance the soil temperature, and improve the performance of the heat pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of the present utility model.

[0027] Among them, 1. solar collector, 2. buried pipe, 3. heat pump unit, 4. hot water storage tank, 5. user terminal, 6. water replenishment device, 7. cooling tower, 8. heat exchanger, 9-1. first three-way valve, 9-2. second three-way valve, 9-3. third three-way valve, 9-4. fourth three-way valve, 9-5. fifth three-way valve, 9-6. sixth three-way valve, 9-7. seventh three-way valve, 9-8. eighth three-way valve, 10-1. first circulating water pump, 10-2. second circulating water pump, 10-3. third circulating water pump, 10-4. fourth circulating water pump, 10-5. fifth circulating water pump, 10-6. sixth circulating water pump, 10-7. seventh circulating water pump. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1 The present invention is further described in detail with reference to specific embodiments.

[0029] This embodiment provides a multi-source heat pump heating and cooling system, such as Figure 1 As shown, it includes: a solar collector 1, a buried pipe 2, a heat pump unit 3, a hot water storage tank 4, a user terminal 5, a water replenishment device 6, a cooling tower 7, a plate heat exchanger 8, a first three-way valve 9-1, a second three-way valve 9-2, a third three-way valve 9-3, a fourth three-way valve 9-4, a fifth three-way valve 9-5, a sixth three-way valve 9-6, a seventh three-way valve 9-7, an eighth three-way valve 9-8, a first circulating water pump 10-1, a second circulating water pump 10-2, a third circulating water pump 10-3, a fourth circulating water pump 10-4, a fifth circulating water pump 10-5, a sixth circulating water pump 10-6, a seventh circulating water pump 10-7, and a control system.

[0030] The solar collector 1, the heat storage tank 4 and the user terminal 5 are connected through the third circulating water pump 10-3 and the fifth circulating water pump 10-5 to form a solar heating circuit. The solar heating circuit is provided with a first three-way valve 9-1, a third three-way valve 9-3, a fifth three-way valve 9-5, a sixth three-way valve 9-6, a seventh three-way valve 9-7 and an eighth three-way valve 9-8. The solar collector 1 is a flat-plate solar collector, a full-glass vacuum tube solar collector, or a metal-glass vacuum tube solar collector. Temperature probes are installed in the water inlet, water outlet and heat storage tank 4 of the solar collector 1, which can monitor the temperature of the water in the water inlet, water outlet and heat storage tank 4 of the solar collector 1 in real time, and can control the opening of the three-way valve according to the temperature.

[0031] The buried pipe 2, heat pump unit 3, hot water storage tank 4, and user terminal 5 are connected via the second circulating water pump 10-2, fourth circulating water pump 10-4, and fifth circulating water pump 10-5, forming a geothermal heat pump heating / cooling circuit. This circuit is equipped with a second three-way valve 9-2, a fourth three-way valve 9-4, a fifth three-way valve 9-5, a sixth three-way valve 9-6, a seventh three-way valve 9-7, and an eighth three-way valve 9-8. The buried pipe 2 is a vertical single U-shaped buried pipe. Furthermore, the solar collector 1 and buried pipe 2 are connected via the first circulating water pump 10-1, forming a heat storage and recharge circuit. This circuit is equipped with a first three-way valve 9-1, a second three-way valve 9-2, a third three-way valve 9-3, and a fourth three-way valve 9-4.

[0032] Cooling tower 7, heat exchanger 8, and user terminal 5 are connected via seventh and sixth circulating water pumps 10-7 and 10-6, forming a cooling tower cooling circuit. This circuit is equipped with seventh and eighth three-way valves 9-7 and 9-8. When cooling tower 7 is running low on water, a water replenishment device 6 is connected to it to replenish the water supply.

[0033] This embodiment provides a multi-source heat pump heating and cooling system with six operating modes, depending on the usage scenario: solar heating, combined solar and ground-source heat pump heating, ground-source heat pump heating, cooling tower cooling, cooling tower-assisted ground-source heat pump cooling, and thermal storage and recharge. Switching between these modes is accomplished by automatically opening a three-way valve in the control system. Operating in different modes in different situations maximizes energy utilization.

[0034] During the heating season, when the outlet water temperature of the heat storage tank 4 is higher than 48°C and lower than 65°C, the multi-source heat pump system is in solar heating mode. The operation process of the solar heating mode requires opening the third circulation pump 10-3, the fifth circulation pump 10-5, the first three-way valve 9-1, the third three-way valve 9-3, the seventh three-way valve 9-7 and the eighth three-way valve 9-8. The solar collector 1 transfers the heat absorbed by solar radiation to the heat storage tank 4, and the heat storage tank 4 delivers the hot water to the user terminal 5.

[0035] During the heating season, when the outlet water temperature of the hot water storage tank 4 is less than 48°C, the multi-source heat pump system is in the solar ground source heat pump combined heating mode. During the operation of the solar ground source heat pump combined heating mode, the solar collector 1 and the heat pump unit 3 jointly supply heat to the user terminal 5. In addition to opening the third circulating water pump 10-3, the fifth circulating water pump 10-5, the first three-way valve 9-1, the third three-way valve 9-3, the seventh three-way valve 9-7 and the eighth three-way valve 9-8, the second circulating water pump 10-2, the fourth circulating water pump 10-4, the second three-way valve 9-2, the fourth three-way valve 9-4, the fifth three-way valve 9-5 and the sixth three-way valve 9-6 must also be opened. The solar collector 1 transfers the heat absorbed by solar radiation to the hot water storage tank 4, the heat pump unit 3 transfers the heat extracted from the buried pipe 2 to the hot water storage tank 4, and the hot water storage tank 4 delivers hot water to the user terminal 5.

[0036] During the heating season, when the solar collector 1 cannot work normally due to rainy weather, dust or night, the multi-source heat pump system is in the ground source heat pump heating mode. The operation process of the ground source heat pump heating mode requires turning on the second circulating water pump 10-2, the fourth circulating water pump 10-4, the fifth circulating water pump 10-5, the second three-way valve 9-2, the fourth three-way valve 9-4, the fifth three-way valve 9-5, the sixth three-way valve 9-6, the seventh three-way valve 9-7 and the eighth three-way valve 9-8. The heat pump unit 3 transfers the heat extracted from the buried pipe 2 to the heat storage tank 4, and the heat storage tank 4 delivers the hot water to the user terminal 5.

[0037] During the cooling season, when the cooling load is not large or the outdoor temperature is not high, the multi-source heat pump system is in the cooling tower cooling mode. The operation process of the cooling tower cooling mode requires turning on the seventh circulating water pump 10-7, the sixth circulating water pump 10-6, the seventh three-way valve 9-7 and the eighth three-way valve 9-8. The cooling tower 7 provides cold energy to the plate heat exchanger 8, and the plate heat exchanger 8 sends the cold energy to the user terminal 5.

[0038] In the cooling season, when the cooling tower 7 is insufficient to meet the cooling load or the outdoor temperature is too high, the multi-source heat pump system is in the cooling tower assisted ground source heat pump cooling mode. During the operation of the cooling tower assisted ground source heat pump cooling mode, the cooling tower 7 and the heat pump unit 3 jointly supply cooling to the user terminal 5. On the basis of turning on the seventh circulating water pump 10-7, the sixth circulating water pump 10-6, the seventh three-way valve 9-7 and the eighth three-way valve 9-8, the second circulating water pump 10-2, the fourth circulating water pump 10-4, the fifth circulating water pump 10-5, the second three-way valve 9-2, the fourth three-way valve 9-4, the fifth three-way valve 9-5 and the sixth three-way valve 9-6 are also needed. The cooling tower 7 provides cold energy to the plate heat exchanger 8, and the plate heat exchanger 8 sends the cold energy to the user terminal 5. The heat pump unit 3 transfers the cold energy extracted from the buried pipe 2 to the hot water storage tank 4, and the hot water storage tank 4 sends the cold energy to the user terminal 5.

[0039] In the transition season, when the temperature difference between the inlet and outlet of the solar collector 1 is greater than 2°C and less than 20°C, the multi-source heat pump system is in the heat storage and recharge mode. The heat storage and recharge mode requires opening the first circulating water pump 10-1, the first three-way valve 9-1, the second three-way valve 9-2, the third three-way valve 9-3 and the fourth three-way valve 9-4, and the solar collector 1 transfers the heat absorbed by the solar radiation to the buried pipe 2.

[0040] The above embodiments are merely examples for the purpose of illustrating the present invention and are not intended to limit its implementation. Persons skilled in the art will be able to make various modifications, readjustments, and substitutions without departing from the scope of protection of the present invention. An exhaustive list of all implementations is unnecessary and impossible. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the claims of the present invention.

Claims

1. A multi-source heat pump heating and cooling system, characterized by: A solar thermal collector (1), a buried pipe (2), a heat pump unit (3), a heat storage tank (4), a user terminal (5), a water supply device (6), a cooling tower (7), a plate heat exchanger (8) and a control system. The multi-source heat pump heating and cooling system consists of four circuits: a solar heating circuit, a ground source heat pump heating / cooling circuit, a cooling tower cooling circuit and a recharge heat storage circuit.

2. A multi-source heat pump heating and cooling system according to claim 1, characterized in that: The solar thermal collector (1), the heat storage tank (4) and the user terminal (5) are connected via a third circulating water pump (10-3) and a fifth circulating water pump (10-5) to form a solar heating circuit. The solar heating circuit is provided with a first three-way valve (9-1), a third three-way valve (9-3), a fifth three-way valve (9-5), a sixth three-way valve (9-6), a seventh three-way valve (9-7) and an eighth three-way valve (9-8). The buried pipe (2), the heat pump unit (3), The heat storage tank (4) is connected to the user terminal (5) through the second circulating water pump (10-2), the fourth circulating water pump (10-4) and the fifth circulating water pump (10-5), forming a ground source heat pump heating / cooling circuit. The ground source heat pump heating / cooling circuit is provided with a second three-way valve (9-2), a fourth three-way valve (9-4), a fifth three-way valve (9-5), a sixth three-way valve (9-6), a seventh three-way valve (9-7) and an eighth three-way valve (9-8). The cooling tower (7) The heat exchanger (8) is connected to the user terminal (5) through the seventh circulating water pump (10-7) and the sixth circulating water pump (10-6) to form a cooling tower cooling circuit, and the cooling tower cooling circuit is provided with a seventh three-way valve (9-7) and an eighth three-way valve (9-8). The solar collector (1) and the buried pipe (2) are connected through the first circulating water pump (10-1) to form a heat storage recharge circuit, and the heat storage recharge circuit is provided with a first three-way valve (9-1), a second three-way valve (9 -2), a third three-way valve (9-3) and a fourth three-way valve (9-4), the water inlet, the water outlet and the heat storage tank (4) of the solar thermal collector (1) are equipped with temperature probes, which can monitor the temperature of the water in the water inlet, the water outlet and the heat storage tank (4) of the solar thermal collector (1) in real time, and can control the opening of the three-way valve according to the temperature, and the solar thermal collector (1) is a flat-plate solar thermal collector, a full-glass vacuum tube solar thermal collector, or a metal-glass vacuum tube solar thermal collector.

3. The multi-source heat pump heating and cooling system according to claim 1, characterized in that: The water replenishing device (6) is connected to the cooling tower (7) and can replenish water for the cooling tower (7). The buried pipe (2) is a vertical single U-shaped buried pipe.

4. A multi-source heat pump heating and cooling system according to any one of claims 1 to 3, characterized in that: The multi-source heat pump heating and cooling system has six operating modes, including solar heating mode, solar ground source heat pump combined heating mode, ground source heat pump heating mode, cooling tower cooling mode, cooling tower assisted ground source heat pump cooling mode, and heat storage recharge mode.

5. The multi-source heat pump heating and cooling system according to claim 4, characterized in that: During the heating season, when the outlet water temperature of the heat storage tank (4) is higher than 48°C and lower than 65°C, the multi-source heat pump heating and cooling system is in a solar heating mode. The operation process of the solar heating mode requires opening the third circulating water pump (10-3), the fifth circulating water pump (10-5), the first three-way valve (9-1), the third three-way valve (9-3), the seventh three-way valve (9-7) and the eighth three-way valve (9-8). The solar collector (1) transfers the heat absorbed by solar radiation to the heat storage tank (4), and the heat storage tank (4) delivers the hot water to the user terminal (5).

6. The multi-source heat pump heating and cooling system according to claim 4, characterized in that: During the heating season, when the outlet water temperature of the heat storage tank (4) is less than 48°C, the multi-source heat pump heating and cooling system is a solar ground source heat pump combined heating mode. During the operation of the solar ground source heat pump combined heating mode, the solar collector (1) and the heat pump unit (3) jointly provide heat for the user terminal (5). When the third circulating water pump (10-3), the fifth circulating water pump (10-5), the first three-way valve (9-1), the third three-way valve (9-3), the seventh three-way valve (9-7) and the eighth three-way valve are turned on, On the basis of the valve (9-8), it is also necessary to open the second circulating water pump (10-2), the fourth circulating water pump (10-4), the second three-way valve (9-2), the fourth three-way valve (9-4), the fifth three-way valve (9-5) and the sixth three-way valve (9-6). The solar collector (1) transfers the heat absorbed by solar radiation to the hot water storage tank (4). The heat pump unit (3) transfers the heat extracted from the buried pipe (2) to the hot water storage tank (4). The hot water storage tank (4) delivers the hot water to the user terminal (5).

7. The multi-source heat pump heating and cooling system according to claim 4, characterized in that: During the heating season, when the solar collector (1) cannot operate normally due to rainy weather, dusty conditions, or at night, the multi-source heat pump heating and cooling system is in a ground source heat pump heating mode. The operation process of the ground source heat pump heating mode requires the opening of the second circulating water pump (10-2), the fourth circulating water pump (10-4), the fifth circulating water pump (10-5), the second three-way valve (9-2), the fourth three-way valve (9-4), the fifth three-way valve (9-5), the sixth three-way valve (9-6), the seventh three-way valve (9-7), and the eighth three-way valve (9-8). The heat pump unit (3) transfers the heat extracted from the buried pipe (2) to the heat storage tank (4), and the heat storage tank (4) delivers the hot water to the user terminal (5).

8. The multi-source heat pump heating and cooling system according to claim 4, characterized in that: In the cooling season, when the cooling load is not large or the outdoor temperature is not high, the multi-source heat pump heating and cooling system is in the cooling tower cooling mode. The operation process of the cooling tower cooling mode requires turning on the seventh circulating water pump (10-7), the sixth circulating water pump (10-6), the seventh three-way valve (9-7) and the eighth three-way valve (9-8). The cooling tower (7) provides the cold energy to the plate heat exchanger (8), and the plate heat exchanger (8) sends the cold energy to the user terminal (5).

9. The multi-source heat pump heating and cooling system according to claim 4, characterized in that: In the cooling season, when the cooling tower (7) is insufficient to meet the cooling load or the outdoor temperature is too high, the multi-source heat pump heating and cooling system is in the cooling tower auxiliary ground source heat pump cooling mode. During the operation of the cooling tower auxiliary ground source heat pump cooling mode, the cooling tower (7) and the heat pump unit (3) jointly provide cooling for the user terminal (5). In addition to opening the seventh circulating water pump (10-7), the sixth circulating water pump (10-6), the seventh three-way valve (9-7) and the eighth three-way valve (9-8), the second circulating water pump ( 10-2), the fourth circulating water pump (10-4), the fifth circulating water pump (10-5), the second three-way valve (9-2), the fourth three-way valve (9-4), the fifth three-way valve (9-5) and the sixth three-way valve (9-6), the cooling tower (7) provides cold energy to the plate heat exchanger (8), the plate heat exchanger (8) sends the cold energy to the user end (5), the heat pump unit (3) transfers the cold energy extracted from the buried pipe (2) to the hot water storage tank (4), and the hot water storage tank (4) sends the cold energy to the user end (5).

10. The multi-source heat pump heating and cooling system according to claim 4, characterized in that: During the transition season, when the temperature difference between the inlet and outlet of the solar thermal collector (1) is greater than 2°C and less than 20°C, the multi-source heat pump heating and cooling system is in a heat storage and recharge mode. The heat storage and recharge mode requires the first circulating water pump (10-1), the first three-way valve (9-1), the second three-way valve (9-2), the third three-way valve (9-3) and the fourth three-way valve (9-4) to be turned on, and the solar thermal collector (1) transfers the heat absorbed by solar radiation to the buried pipe (2).

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