A renewable energy multi-energy complementary zero-carbon heating system

Abstract

The utility model discloses a renewable energy multi-energy complementary zero carbon heating system, it includes middle deep layer geothermal energy heating unit, shallow geothermal energy heating unit, air energy heating unit, solar energy heating unit, heat source side set and divide water unit, user side set and divide water unit, user heating unit, domestic hot water unit and make up water unit. The utility model discloses with solar energy, middle deep layer geothermal energy, shallow soil geothermal energy, air energy four common renewable energy as heating heat source, form multi-energy complementary zero carbon heating system, solar energy photo-thermal, shallow soil geothermal energy, air energy, middle deep layer geothermal energy as heat source coupling after, can give full play to the advantage of various energy, improve the energy efficiency and reliability of heating system.

Description

Technical Field

[0001] This utility model relates to the field of multi-energy complementary heating and thermal storage technology, specifically a renewable energy multi-energy complementary zero-carbon heating system. Background Technology

[0002] In northern my country, building heating systems account for a significant portion of total energy consumption and carbon emissions, making them a crucial area for achieving the goals of "carbon peaking and carbon neutrality" and the "dual control" requirements for energy consumption and carbon emissions. Currently, thanks to clean heating policies, traditional high-pollution heating models have been effectively replaced in northern China, and the proportion of clean heating has increased significantly. However, the proportion of renewable energy in the heating system remains low, failing to meet the needs of deep carbon reduction in the building sector and becoming a major bottleneck restricting the low-carbon transformation of this area.

[0003] Solar energy, air source heat pumps, and geothermal energy are all zero-carbon emission, abundant renewable energy sources. However, in practical applications in northern regions, all three energy types face technological limitations: solar energy is affected by day and night and seasons, resulting in low energy flux density and poor power supply stability, making it impossible to guarantee continuous heating and cooling; air source heat pumps, while capable of operating around the clock, have low energy flux density, and the low temperatures of northern winters cause a significant decrease in equipment energy efficiency, making them unsuitable for the needs of frigid regions; geothermal energy is affected by regional geological conditions and underground thermal balance characteristics, easily leading to underground thermal imbalances, which can reduce extraction efficiency and even cause geological environmental risks in the long term. Therefore, it is urgent to address the problems of these renewable energy sources in the application of northern regions through technological means, improve their compatibility with building heating and cooling systems and increase their application ratio, and provide a sound technological path for the building sector to achieve its "dual-carbon" goals. Utility Model Content

[0004] The purpose of this invention is to provide a renewable energy multi-energy complementary zero-carbon heating system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A renewable energy multi-energy complementary zero-carbon heating system includes: A medium-deep geothermal energy heating unit for extracting medium-deep geothermal energy from the earth's rock, which includes a geothermal heat exchange well and a medium-deep geothermal main unit; A shallow geothermal energy heating unit for extracting shallow soil geothermal energy includes a shallow buried pipe and a shallow soil source heat pump; the shallow buried pipe is connected to the shallow soil source heat pump circuit through a shallow circulation pipe. An air source heat pump unit is used to convert low-grade heat energy in the air into high-grade heat energy. It includes an air source heat pump unit. A heat source side water collection and distribution unit for collecting and distributing water on the heat source side includes a heat source side water collector and a heat source side water distributor. A user-side water collection and distribution unit for collecting and distributing water on the user side includes a user-side water collector and a user-side water distributor. The user heating unit includes a user-side return water pipe and a user-side supply water pipe; The inlet side of the heat source-side water collector is connected to the geothermal heat exchange well via a geothermal water supply pipe. The outlet side of the heat source-side water collector is connected to the medium-deep geothermal generator. The inlet side of the heat source-side water distributor is connected to the medium-deep geothermal generator. The outlet side of the heat source-side water distributor is connected to the geothermal heat exchange well via a geothermal return water pipe. The inlet side of the user-side water collector is connected to the medium-deep geothermal generator, the air source heat pump generator, and the shallow soil source heat pump, respectively. The outlet side of the user-side water collector is connected to the user-side water supply pipe. The inlet side of the user-side water distributor is connected to the user-side return water pipe. The outlet side of the user-side water distributor is connected to the medium-deep geothermal generator, the air source heat pump generator, and the shallow soil source heat pump, respectively.

[0006] Furthermore, it also includes a domestic hot water unit, which includes a domestic hot water tank and a first heat exchanger. The heating side inlet of the first heat exchanger is connected to the water outlet of the user-side water collector, the heating side outlet of the first heat exchanger is connected to the water inlet of the user-side water distributor, and the heat extraction side of the first heat exchanger is connected to the domestic hot water tank circuit through a first domestic hot water circulation pipe.

[0007] Furthermore, it also includes a solar heating unit for converting solar energy into heat energy. The solar heating unit includes a solar collector, a solar hot water tank, a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a first electric three-way valve, a second electric three-way valve, and a third electric three-way valve. The heating side of the second heat exchanger is connected to the solar collector circuit via a solar collector circulation pipe. The heat extraction side outlet of the second heat exchanger is connected to the inlet of the third electric three-way valve. The heat extraction side inlet of the second heat exchanger is connected to the solar hot water tank. The a-side outlet of the third electric three-way valve is connected to the solar hot water tank. The b-side outlet of the third electric three-way valve is connected to the heating side inlet of the fourth heat exchanger. The heat exchanger's heating side outlet is connected to the solar hot water tank. The fourth heat exchanger's heat extraction side is connected to the domestic hot water tank circuit via the second domestic hot water circulation pipe. The third heat exchanger's heating side is connected to the solar hot water tank circuit via the solar thermal storage circulation pipe. The third heat exchanger's heat extraction side outlet is connected to the first electric three-way valve inlet. The first electric three-way valve's a-side outlet is connected to the user-side water collector inlet. The first electric three-way valve's b-side outlet is connected to the heat source-side water collector inlet. The third heat exchanger's heat extraction side inlet is connected to the second electric three-way valve outlet. The second electric three-way valve's a-side inlet is connected to the heat source-side water distributor outlet. The second electric three-way valve's b-side inlet is connected to the user-side water distributor outlet.

[0008] Furthermore, it also includes a water replenishment unit, which includes a water replenishment main pipe and a softened water tank. The inlet of the softened water tank is connected to the water replenishment main pipe, and the inlet of the water replenishment main pipe is connected to an external tap water source. The outlet of the softened water tank is connected to the geothermal return water pipe and the user-side return water pipe, respectively. An automatic water softener is connected in parallel to the water replenishment main pipe. The solar hot water tank is connected to the water replenishment main pipe through a water replenishment branch pipe, and the connection point is located on the water replenishment main pipe section between the automatic water softener and the softened water tank.

[0009] Furthermore, a user-side circulation pump is connected to the user-side return water pipe. There are two user-side circulation pumps, which are connected in parallel, one for use and one for standby.

[0010] Furthermore, a solar heating circulation pump is installed on the pipeline between the heat extraction side outlet of the second heat exchanger and the inlet of the third electric three-way valve.

[0011] Furthermore, a first booster pump is installed on the pipeline between the outlet of the softened water tank and the return water pipe on the user side. There are two first booster pumps connected in parallel, one for use and one for standby. A second booster pump is installed on the pipeline between the outlet of the softened water tank and the geothermal return water pipe. There are two second booster pumps connected in parallel, one for use and one for standby.

[0012] Furthermore, a first electric valve is installed on the pipeline between the outlet side of the user-side water distributor and the medium-deep geothermal generator; a second electric valve is installed on the pipeline between the inlet side of the user-side water collector and the medium-deep geothermal generator; a third electric valve is installed on the pipeline between the outlet side of the user-side water distributor and the air source heat pump generator; a fourth electric valve is installed on the pipeline between the inlet side of the user-side water collector and the air source heat pump generator; the outlet of the fourth heat exchanger on the heating side is connected to the outlet of the third electric valve; the inlet of the fourth heat exchanger on the heating side is connected to the inlet of the fourth electric valve; a fifth electric valve is installed on the pipeline between the inlet of the fourth heat exchanger on the heating side and the inlet of the fourth electric valve; a sixth electric valve is installed on the pipeline between the outlet of the fourth heat exchanger on the heating side and the outlet of the third electric valve; and a seventh electric valve is installed on the shallow circulation pipeline.

[0013] Furthermore, the outlet side of the heat source-side water collector is connected to the shallow circulation pipe on the outlet side of the seventh electric valve via a shallow heat storage and heating pipe, and the inlet side of the heat source-side water distributor is connected to the shallow circulation pipe on the inlet side of the seventh electric valve via a shallow heat storage and return water pipe. An eighth electric valve is installed on the shallow heat storage and heating pipe, and a ninth electric valve is installed on the shallow heat storage and return water pipe.

[0014] Compared with the prior art, the beneficial effects of this utility model are: This invention uses four common renewable energy sources—solar energy, medium-deep geothermal energy, shallow soil geothermal energy, and air energy—as heating sources to form a multi-energy complementary zero-carbon heating system. After the solar thermal energy, shallow soil geothermal energy, air energy, and medium-deep geothermal energy are coupled as heat sources, the advantages of each energy source can be fully utilized to improve the energy efficiency and reliability of the heating system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a renewable energy multi-energy complementary zero-carbon heating system according to the present invention; In the diagram: 1-Geothermal heat exchange well; 2-Medium-deep geothermal heat pump unit; 3-Heat source side water collector; 4-Heat source side water distributor; 5-Shallow soil source heat pump; 6-Shallow buried pipe; 7-Air source heat pump unit; 8-Solar collector; 9-Solar hot water tank; 10-User side water collector; 11-User side water distributor; 12-User side circulation pump; 13-Domestic hot water tank; 14-Automatic water softener; 15-Softened water tank; 16-First booster pump; 17-Second booster pump. 18-First heat exchanger, 19-Second heat exchanger, 20-Third heat exchanger, 21-Solar heating circulation pump, 22-First electric three-way valve, 23-Second electric three-way valve, 24-First electric valve, 25-Second electric valve, 26-Third electric valve, 27-Fourth electric valve, 28-Fifth electric valve, 29-Sixth electric valve, 30-Third electric three-way valve, 31-Fourth heat exchanger, 32-Seventh electric valve, 33-Eighth electric valve, 34-Ninth electric valve. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1 This utility model provides a renewable energy multi-energy complementary zero-carbon heating system, comprising: A medium-deep geothermal energy heating unit for extracting medium-deep geothermal energy includes a geothermal heat exchange well 1 and a medium-deep geothermal main unit 2. A shallow geothermal energy heating unit for extracting shallow soil geothermal energy includes a shallow buried pipe 6 and a shallow soil source heat pump 5; the shallow buried pipe 6 is connected to the shallow soil source heat pump 5 via a shallow circulation pipe. An air source heat pump unit is used to convert low-grade heat energy in the air into high-grade heat energy. It includes an air source heat pump unit 7. A heat source side water collection and distribution unit for collecting and distributing water on the heat source side includes a heat source side water collector 3 and a heat source side water distributor 4. A user-side water collection and distribution unit for collecting and distributing water on the user side includes a user-side water collector 10 and a user-side water distributor 11. The user heating unit includes a user-side return water pipe and a user-side supply water pipe; The inlet side of the heat source-side water collector 3 is connected to the geothermal heat exchange well 1 via a geothermal water supply pipe. The outlet side of the heat source-side water collector 3 is connected to the medium-deep geothermal host 2. The inlet side of the heat source-side water distributor 4 is connected to the medium-deep geothermal host 2. The outlet side of the heat source-side water distributor 4 is connected to the geothermal heat exchange well 1 via a geothermal return water pipe. The inlet side of the user-side water collector 10 is connected to the medium-deep geothermal host 2, the air source heat pump host 7, and the shallow soil source heat pump 5, respectively. The outlet side of the user-side water collector 10 is connected to the user-side water supply pipe. The inlet side of the user-side water distributor 11 is connected to the user-side return water pipe. The outlet side of the user-side water distributor 11 is connected to the medium-deep geothermal host 2, the air source heat pump host 7, and the shallow soil source heat pump 5, respectively.

[0018] Specifically, it also includes a domestic hot water unit, which includes a domestic hot water tank 13 and a first heat exchanger 18. The heating side inlet of the first heat exchanger 18 is connected to the water outlet of the user-side water collector 10, and the heating side outlet of the first heat exchanger 18 is connected to the water inlet of the user-side water distributor 11. The heat extraction side of the first heat exchanger 18 is connected to the domestic hot water tank 13 via a first domestic hot water circulation pipe.

[0019] Specifically, it also includes a solar heating unit for converting solar energy into heat energy. The solar heating unit includes a solar collector 8, a solar hot water tank 9, a second heat exchanger 19, a third heat exchanger 20, a fourth heat exchanger 31, a first electric three-way valve 22, a second electric three-way valve 23, and a third electric three-way valve 30. The heating side of the second heat exchanger 19 is connected to the solar collector 8 circuit via a solar collector circulation pipe. The heat extraction side outlet of the second heat exchanger 19 is connected to the inlet of the third electric three-way valve 30. The heat extraction side inlet of the second heat exchanger 19 is connected to the solar hot water tank 9. The a-side outlet of the third electric three-way valve 30 is connected to the solar hot water tank 9, and the b-side outlet of the third electric three-way valve 30 is connected to the heating side inlet of the fourth heat exchanger 31. The outlet of the heat exchanger 31 on the heating side is connected to the solar hot water tank 9. The heat-receiving side of the fourth heat exchanger 31 is connected to the domestic hot water tank 13 circuit through the second domestic hot water circulation pipe. The heating side of the third heat exchanger 20 is connected to the solar hot water tank 9 circuit through the solar thermal storage circulation pipe. The outlet of the heat-receiving side of the third heat exchanger 20 is connected to the inlet of the first electric three-way valve 22. The outlet on side a of the first electric three-way valve 22 is connected to the inlet of the user-side water collector 10. The outlet on side b of the first electric three-way valve 22 is connected to the inlet of the heat source-side water collector 3. The inlet of the heat-receiving side of the third heat exchanger 20 is connected to the outlet of the second electric three-way valve 23. The inlet on side a of the second electric three-way valve 23 is connected to the outlet of the heat source-side water distributor 4. The inlet on side b of the second electric three-way valve 23 is connected to the outlet of the user-side water distributor 11.

[0020] Specifically, it also includes a water replenishment unit, which includes a water replenishment main pipe and a softened water tank 15. The inlet of the softened water tank 15 is connected to the water replenishment main pipe, and the inlet of the water replenishment main pipe is connected to an external tap water source. The outlet of the softened water tank 15 is connected to the geothermal return water pipe and the user-side return water pipe, respectively. An automatic water softener 14 is connected in parallel to the water replenishment main pipe. The solar hot water tank 9 is connected to the water replenishment main pipe through a water replenishment branch pipe, and the connection point is located on the water replenishment main pipe section between the automatic water softener 14 and the softened water tank 15.

[0021] Specifically, a user-side circulation pump 12 is connected to the user-side return water pipe. There are two user-side circulation pumps 12, which are connected in parallel, one for use and one for standby.

[0022] Specifically, a solar heating circulation pump 21 is installed on the pipeline between the heat extraction side outlet of the second heat exchanger 19 and the inlet of the third electric three-way valve 30.

[0023] Specifically, a first booster pump 16 is installed on the pipeline between the outlet of the softened water tank 15 and the return water pipe on the user side. There are two first booster pumps 16, which are connected in parallel, one for use and one for standby. A second booster pump 17 is installed on the pipeline between the outlet of the softened water tank 15 and the geothermal return water pipe. There are two second booster pumps 17, which are connected in parallel, one for use and one for standby.

[0024] Specifically, a first electric valve 24 is installed on the pipeline between the outlet side of the user-side water distributor 11 and the medium-deep geothermal generator 2; a second electric valve 25 is installed on the pipeline between the inlet side of the user-side water collector 10 and the medium-deep geothermal generator 2; a third electric valve 26 is installed on the pipeline between the outlet side of the user-side water distributor 11 and the air source heat pump generator 7; a fourth electric valve 27 is installed on the pipeline between the inlet side of the user-side water collector 10 and the air source heat pump generator 7; the outlet of the heating side of the fourth heat exchanger 31 is connected to the outlet of the third electric valve 26; the inlet of the heating side of the fourth heat exchanger 31 is connected to the inlet of the fourth electric valve 27; a fifth electric valve 28 is installed on the pipeline between the inlet of the heating side of the fourth heat exchanger 31 and the inlet of the fourth electric valve 27; a sixth electric valve 29 is installed on the pipeline between the outlet of the heating side of the fourth heat exchanger 31 and the outlet of the third electric valve 26; and a seventh electric valve 32 is installed on the shallow circulation pipeline.

[0025] Specifically, the outlet side of the heat source side water collector 3 is connected to the shallow circulation pipe on the outlet side of the seventh electric valve 32 through a shallow heat storage and heating pipe, and the inlet side of the heat source side water distributor 4 is connected to the shallow circulation pipe on the inlet side of the seventh electric valve 32 through a shallow heat storage and return water pipe. An eighth electric valve 33 is installed on the shallow heat storage and heating pipe, and a ninth electric valve 34 is installed on the shallow heat storage and return water pipe.

[0026] As a preferred embodiment of this utility model, the solar collector 8 adopts a PVT collector, and the solar energy is divided into two parts: solar thermal energy and solar photovoltaic power generation. The solar photovoltaic can provide the required power for the heat pump and circulation pump of the entire system.

[0027] The working principle and operation method of this utility model: Winter heating operation: The first electric three-way valve 22 opens side a, the second electric three-way valve 23 opens side b, the third electric three-way valve 30 opens side a, the first electric valve 24, the second electric valve 25, the third electric valve 26, the fourth electric valve 27, and the seventh electric valve 32 are open, and the fifth electric valve 28, the sixth electric valve 29, the eighth electric valve 33, and the ninth electric valve 34 are closed. The hot water provided by the solar hot water tank 9, the medium-deep geothermal generator 2, and the shallow soil source heat pump 5 all enter the user-side water collector 10. After heat exchange at the heating terminal, the hot water enters the user-side water supply pipe and enters the user-side water distributor 11 under the action of the user-side circulation pump 12, and then flows back for heat exchange. This constitutes an operation mode with medium-deep geothermal energy as the basic heat source, air source heat energy and shallow soil geothermal energy as complementary energy sources, and solar energy as the peak-shaving energy source.

[0028] Domestic hot water operation: First, solar energy is used to ensure domestic hot water throughout the year. The third electric three-way valve 30 opens side b. The heat collected by the solar collector 8 is continuously exchanged through the second heat exchanger 19 and the fourth heat exchanger 31 and then stored in the domestic hot water tank 13. When the temperature of the domestic hot water tank 13 is higher than the set value, the third electric three-way valve 30 opens side a. The heat collected by the solar collector 8 is exchanged through the second heat exchanger 19 and then the solar hot water directly enters the solar hot water supply tank 9. In winter, when the temperature of the tank is higher than the set value, it can be used as a peak heating source. Otherwise, it is used as a heat storage source. In the non-heating season, it is used as a high-temperature heat storage source.

[0029] Thermal storage operation: During the non-heating season, solar energy serves as a high-temperature heat source for thermal storage. After meeting the domestic hot water needs, the third electric three-way valve 30 opens side a. At this time, the solar hot water tank 9 acts as a hot water storage tank. When its temperature exceeds the set thermal storage temperature, the hot water undergoes heat exchange through the third heat exchanger 20. Then, the first electric three-way valve 22 opens side b, the seventh electric valve 32 closes, and the eighth electric valve 33 and the ninth electric valve 34 open. The solar hot water then enters the shallow buried pipe 6 on the shallow soil source heat pump side after passing through the heat source side collector 3. After exchanging heat with the soil, it enters the heat source side distributor 4. At this time, the second electric three-way valve 23 opens side a, and the return water enters the third heat exchanger 20 for circulating heat exchange, realizing the storage of solar heat in the shallow soil.

[0030] Summer air conditioning operation: The shallow soil source heat pump 5 and the air source heat pump switch their evaporators and condensers through the internal four-way conversion valve, while the external connecting pipes remain unchanged. The user-side circulating water of both the shallow soil source heat pump 5 and the air source heat pump enters the user-side water collector 10. Unlike the winter heating operation, the user side is connected to the main unit evaporator at this time, while in winter it is connected to the condenser. At this time, the water output from the user side is the air conditioning chilled water, which achieves indoor air conditioning cooling under the action of the user-side circulating pump 12.

Claims

1. A renewable energy multi-energy complementary zero-carbon heating system, characterized in that, include: A medium-deep geothermal energy heating unit for extracting medium-deep geothermal energy from the earth's rock, which includes a geothermal heat exchange well and a medium-deep geothermal main unit; A shallow geothermal energy heating unit for extracting shallow soil geothermal energy includes a shallow buried pipe and a shallow soil source heat pump; the shallow buried pipe is connected to the shallow soil source heat pump circuit through a shallow circulation pipe. An air source heat pump unit is used to convert low-grade heat energy in the air into high-grade heat energy. It includes an air source heat pump unit. A heat source side water collection and distribution unit for collecting and distributing water on the heat source side includes a heat source side water collector and a heat source side water distributor. A user-side water collection and distribution unit for collecting and distributing water on the user side includes a user-side water collector and a user-side water distributor. The user heating unit includes a user-side return water pipe and a user-side supply water pipe; The inlet side of the heat source-side water collector is connected to the geothermal heat exchange well via a geothermal water supply pipe. The outlet side of the heat source-side water collector is connected to the medium-deep geothermal generator. The inlet side of the heat source-side water distributor is connected to the medium-deep geothermal generator. The outlet side of the heat source-side water distributor is connected to the geothermal heat exchange well via a geothermal return water pipe. The inlet side of the user-side water collector is connected to the medium-deep geothermal generator, the air source heat pump generator, and the shallow soil source heat pump, respectively. The outlet side of the user-side water collector is connected to the user-side water supply pipe. The inlet side of the user-side water distributor is connected to the user-side return water pipe. The outlet side of the user-side water distributor is connected to the medium-deep geothermal generator, the air source heat pump generator, and the shallow soil source heat pump, respectively.

2. The renewable energy multi-energy complementary zero-carbon heating system as described in claim 1, characterized in that: It also includes a domestic hot water unit, which includes a domestic hot water tank and a first heat exchanger. The heating side inlet of the first heat exchanger is connected to the water outlet of the user-side water collector, the heating side outlet of the first heat exchanger is connected to the water inlet of the user-side water distributor, and the heat extraction side of the first heat exchanger is connected to the domestic hot water tank circuit through a first domestic hot water circulation pipe.

3. The renewable energy multi-energy complementary zero-carbon heating system as described in claim 2, characterized in that: It also includes a solar heating unit for converting solar energy into heat energy. The solar heating unit includes a solar collector, a solar hot water tank, a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a first electric three-way valve, a second electric three-way valve, and a third electric three-way valve. The heating side of the second heat exchanger is connected to the solar collector circuit via a solar collector circulation pipe. The heat extraction side outlet of the second heat exchanger is connected to the inlet of the third electric three-way valve. The heat extraction side inlet of the second heat exchanger is connected to the solar hot water tank. The a-side outlet of the third electric three-way valve is connected to the solar hot water tank. The b-side outlet of the third electric three-way valve is connected to the heating side inlet of the fourth heat exchanger. The fourth heat exchanger... The outlet of the heat exchanger on the heating side is connected to the solar hot water tank. The heat extraction side of the fourth heat exchanger is connected to the domestic hot water tank circuit through the second domestic hot water circulation pipe. The heating side of the third heat exchanger is connected to the solar hot water tank circuit through the solar thermal storage circulation pipe. The outlet of the heat extraction side of the third heat exchanger is connected to the inlet of the first electric three-way valve. The outlet on side a of the first electric three-way valve is connected to the inlet side of the user-side water collector. The outlet on side b of the first electric three-way valve is connected to the inlet side of the heat source-side water collector. The inlet of the heat extraction side of the third heat exchanger is connected to the outlet of the second electric three-way valve. The inlet on side a of the second electric three-way valve is connected to the outlet side of the heat source-side water distributor. The inlet on side b of the second electric three-way valve is connected to the outlet side of the user-side water distributor.

4. A renewable energy multi-energy complementary zero-carbon heating system as described in claim 3, characterized in that: It also includes a water replenishment unit, which includes a water replenishment main pipe and a softened water tank. The inlet of the softened water tank is connected to the water replenishment main pipe, and the inlet of the water replenishment main pipe is connected to an external tap water source. The outlet of the softened water tank is connected to the geothermal return water pipe and the user-side return water pipe, respectively. An automatic water softener is connected in parallel to the water replenishment main pipe. The solar hot water tank is connected to the water replenishment main pipe through a water replenishment branch pipe, and the connection point is located on the water replenishment main pipe section between the automatic water softener and the softened water tank.

5. A renewable energy multi-energy complementary zero-carbon heating system as described in claim 4, characterized in that: The user-side return water pipe is connected to a user-side circulation pump. There are two user-side circulation pumps, which are set in parallel, one for use and one for standby.

6. A renewable energy multi-energy complementary zero-carbon heating system as described in claim 5, characterized in that: A solar heating circulation pump is installed on the pipeline between the heat extraction side outlet of the second heat exchanger and the inlet of the third electric three-way valve.

7. A renewable energy multi-energy complementary zero-carbon heating system as described in claim 6, characterized in that: A first booster pump is installed on the pipeline between the outlet of the softened water tank and the return water pipe on the user side. There are two first booster pumps connected in parallel, one for use and one for standby. A second booster pump is installed on the pipeline between the outlet of the softened water tank and the geothermal return water pipe. There are two second booster pumps connected in parallel, one for use and one for standby.

8. A renewable energy multi-energy complementary zero-carbon heating system as described in claim 7, characterized in that: A first electric valve is installed on the pipeline between the outlet side of the user-side water distributor and the medium-deep geothermal generator; a second electric valve is installed on the pipeline between the inlet side of the user-side water collector and the medium-deep geothermal generator; a third electric valve is installed on the pipeline between the outlet side of the user-side water distributor and the air source heat pump generator; a fourth electric valve is installed on the pipeline between the inlet side of the user-side water collector and the air source heat pump generator; the outlet of the fourth heat exchanger on the heating side is connected to the outlet of the third electric valve; the inlet of the fourth heat exchanger on the heating side is connected to the inlet of the fourth electric valve; a fifth electric valve is installed on the pipeline between the inlet of the fourth heat exchanger on the heating side and the inlet of the fourth electric valve; a sixth electric valve is installed on the pipeline between the outlet of the fourth heat exchanger on the heating side and the outlet of the third electric valve; and a seventh electric valve is installed on the shallow circulation pipeline.

9. A renewable energy multi-energy complementary zero-carbon heating system as described in claim 8, characterized in that: The outlet side of the heat source side water collector is connected to the shallow circulation pipe on the outlet side of the seventh electric valve through a shallow heat storage and heating pipe. The inlet side of the heat source side water distributor is connected to the shallow circulation pipe on the inlet side of the seventh electric valve through a shallow heat storage and return water pipe. An eighth electric valve is installed on the shallow heat storage and heating pipe, and a ninth electric valve is installed on the shallow heat storage and return water pipe.

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