Multi-energy complementary heating and refrigerating system capable of efficiently utilizing geothermal energy and air energy

Abstract

The invention provides a multi-energy complementary heating and refrigerating system capable of efficiently utilizing geothermal energy and air energy. The multi-energy complementary heating and refrigerating system comprises a user terminal, a double-working-condition air source heat pump, a water / water heat pump and a ground heat exchanger. The matching relation of an air heat source, a shallow soil heat source and building load characteristics is fully considered, deep and efficient utilization of air heat energy and soil heat energy is achieved through flexible switching of pipelines between the double-working-condition air source heat pump and the water / water heat pump, the system can operate two heating modes and two refrigerating modes according to the load condition, and the system is suitable for large-scale popularization and application. The efficient heating capacity of the double-working-condition air source heat pump in the initial stage and the final stage of heating is utilized, the double-working-condition air source heat pump is coupled with the water / water heat pump, the problems that the double-working-condition air source heat pump is low in energy efficiency coefficient and poor in heating capacity when the outdoor environment is low in the middle stage of heating are effectively solved, meanwhile, on the basis that high energy efficiency is maintained, the amount of heat taken from soil is reduced, and the heat utilization rate is increased. The number of buried pipes is effectively reduced, the investment cost is reduced, the occupied area is reduced, and the application scene is widened.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange systems, and in particular to a multi-energy complementary heating and cooling system that efficiently utilizes geothermal energy and air energy. Background Art

[0002] Most buildings north of the Yangtze River in my country require heating and air-conditioning systems in winter, and the demand for cooling in most areas is also increasing in summer.

[0003] The air source heat pump system uses air as a heat source. It has a simple structure and is green and environmentally friendly, making it the most widely used type of heat pump in the heating field. The main disadvantage of the air source heat pump is that its heating capacity drops significantly when the outdoor temperature is low, and its performance coefficient is low, so its use is limited by the ambient temperature.

[0004] The ground source heat pump system is an integrated system that uses soil heat as a heat source, and uses ground pipe heat exchangers and water / water heat pumps as core components. It is usually more energy-efficient and economical in terms of operating energy efficiency than other types of heat pumps such as air source heat pumps. However, when using a single ground source heat pump system, in order to meet the user's load requirements, it is often necessary to design a sufficiently large ground pipe heat exchanger capacity. This not only directly leads to a high initial investment cost, but also because the ground pipes occupy a large area, if there is not enough space to bury these pipes, the application of this technology will be limited. Therefore, both the high investment cost and space requirements are not conducive to the cost recovery of the ground source heat pump system and its wider application and promotion.

[0005] In view of the heating and cooling needs of different regions, a single ground source heat pump system or air source heat pump system has its limitations. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the limitations of a single ground source heat pump system or an air source heat pump system due to the need for heating and cooling in different regions.

[0007] To this end, the present invention provides a multi-energy complementary heating and cooling system that efficiently utilizes geothermal energy and air energy, comprising:

[0008] User terminals, dual-mode air source heat pumps, water / water heat pumps and ground pipe heat exchangers;

[0009] Among them, the user terminal is used for indoor heating or cooling, the dual-mode air source heat pump uses air energy as a low-temperature heat source to heat the heat exchange medium, and the water / water heat pump is used to extract heat or cold and deliver it to the user; the buried pipe heat exchanger is used for heat exchange between the heat exchange medium and the soil;

[0010] In the first heating mode, after the heat exchange medium is heated in the ground pipe heat exchanger, it is transported to the dual-mode air source heat pump to be further heated and transported to the heat source side of the water / water heat pump to participate in heat exchange, and then transported back to the ground pipe heat exchanger to form a path;

[0011] The heat exchange medium is transported from the user side of the water / water heat pump to the user terminal for heating and then transported back to the water / water heat pump, forming another path;

[0012] The heat exchange medium in the two paths extracts and transports heat through a water / water heat pump;

[0013] In the second heating mode, the heat exchange medium is heated in the dual-condition air source heat pump and then transported to the user terminal for heating, and then transported back to the dual-condition air source heat pump to form a passage;

[0014] In the first cooling mode, the heat exchange medium is transported from the user terminal to the underground heat exchanger for heat exchange, and then transported back to the user terminal for cooling, forming a passage;

[0015] In the second cooling mode, after the heat exchange medium exchanges heat in the ground pipe heat exchanger, it is transported to the heat source side of the water / water heat pump to participate in heat exchange, and then transported back to the ground pipe heat exchanger to form a path;

[0016] The heat exchange medium is transported from the user side of the water / water heat pump to the user end for cooling and then transported back to the water / water heat pump, forming another path;

[0017] The heat exchange medium in the two paths extracts and transports heat through a water / water heat pump.

[0018] Further, the outlet end of the user terminal is connected to the user-side inlet end of the water / water heat pump through a pipeline;

[0019] The user-side outlet of the water / water heat pump is connected to the inlet of the user terminal through a pipeline, and a second water pump is arranged on the pipeline;

[0020] A sixth valve and a second valve are sequentially arranged on a pipeline connecting the outlet end of the user terminal to the user-side inlet end of the water / water heat pump;

[0021] The heat source side outlet of the water / water heat pump is connected to the inlet of the underground heat exchanger through a pipeline, and a first water pump is arranged on the pipeline;

[0022] The outlet end of the underground heat exchanger is connected to the inlet end of the dual-mode air source heat pump through a pipeline, and a fourth valve is arranged on the pipeline;

[0023] The outlet end of the dual-mode air source heat pump is connected to the heat source side inlet end of the water / water heat pump through a pipeline, and an eighth valve is arranged on the pipeline.

[0024] Furthermore, a sixth valve and a second valve are sequentially arranged on the pipeline connecting the outlet end of the user end to the user-side inlet end of the water / water heat pump, wherein a branch is arranged between the second valve and the sixth valve to connect to the inlet end of the first water pump, and the first valve is arranged on the branch.

[0025] Furthermore, the outlet end of the dual-mode air source heat pump is connected to the inlet end of the second water pump through a pipeline, and a seventh valve is arranged on the pipeline.

[0026] Furthermore, a fourth valve is arranged on the pipeline connecting the outlet end of the buried pipe heat exchanger with the inlet end of the dual-condition air source heat pump, a branch is arranged between the inlet end of the dual-condition air source heat pump and the fourth valve to connect to the outlet end of the user end, and a fifth valve is arranged on the branch.

[0027] Furthermore, a branch is provided on the pipeline connected to the outlet end of the buried pipe heat exchanger and the fourth valve, connected to the inlet end of the user end, and a third valve is provided on the branch.

[0028] Furthermore, a heat exchanger is arranged at the connection point between the user terminal and the outdoor composite heat pump system pipeline.

[0029] When there is no need for antifreeze in the system pipeline, the user terminal is directly connected to the outdoor pipeline;

[0030] When there is a need for antifreeze in the system pipes, the heat exchanger provides an indirect connection method to transfer heat to the water in the user's terminal pipes.

[0031] Furthermore, the dual operating conditions of the dual operating condition air source heat pump include: a condition for producing low-temperature hot water and a condition for producing heating water.

[0032] The beneficial effects of this application are:

[0033] The present invention provides a multi-energy complementary heating and cooling system that efficiently utilizes geothermal energy and air energy, comprising: a user terminal, a dual-mode air source heat pump, a water / water heat pump and a buried pipe heat exchanger; wherein the user terminal is used for indoor heating or cooling, the dual-mode air source heat pump uses air energy as a low-temperature heat source to heat a heat exchange medium, and the water / water heat pump is used to extract heat or cold and deliver it to the user; the buried pipe heat exchanger is used for heat exchange between the heat exchange medium and the soil; in the first heating mode, after the heat exchange medium is heat exchanged in the buried pipe heat exchanger, it is transported to the dual-mode air source heat pump for further heating and transported to the heat source side of the water / water heat pump for heat exchange, and then transported back to the buried pipe heat exchanger to form a passage; the heat exchange medium is transported from the user side of the water / water heat pump to the user terminal for heating and then transported back to the water / water heat pump to form another The heat exchange medium in the two pathways extracts and transports heat through the water / water heat pump; in the second heating mode, the heat exchange medium is heated in the dual-condition air source heat pump and then transported to the user terminal for heating, and then transported back to the dual-condition air source heat pump to form a pathway; in the first cooling mode, the heat exchange medium is transported from the user terminal to the buried pipe heat exchanger for heat exchange, and then transported back to the user terminal for cooling, forming a pathway; in the second cooling mode, the heat exchange medium is transported to the heat source side of the water / water heat pump for heat exchange after heat exchange in the buried pipe heat exchanger, and then transported back to the buried pipe heat exchanger to form a pathway; the heat exchange medium is transported from the user side of the water / water heat pump to the user terminal for cooling and then transported back to the water / water heat pump to form another pathway; the heat exchange medium in the two pathways extracts and transports heat through the water / water heat pump.

[0034] The present invention realizes the deep joint utilization of air heat energy and soil heat energy through the flexible switching of the pipelines between the dual-mode air source heat pump and the water / water heat pump, which greatly utilizes the heating capacity of the dual-mode air source heat pump, and effectively utilizes the water / water heat pump combined with soil heat energy to solve the problem of low energy efficiency coefficient of the dual-mode air source heat pump when the outdoor environment is low. In addition, while maintaining high energy efficiency, the system reduces the amount of heat taken from the soil, effectively reduces the number of buried pipes, reduces investment costs, reduces floor space, and broadens application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on the specifics of the present invention and in conjunction with the accompanying drawings.

[0036] Figure 1 This is a schematic diagram of the structure of a multi-energy complementary heating and cooling system that efficiently utilizes geothermal energy and air energy as mentioned in the present invention;

[0037] Figure 2 It is a schematic diagram of the operation of a multi-energy complementary heating and cooling system that efficiently utilizes geothermal energy and air energy in a first heating mode or a second cooling mode mentioned in the present invention;

[0038] Figure 3 It is a schematic diagram of the operation of a multi-energy complementary heating and cooling system for efficiently utilizing geothermal energy and air energy in a second heating mode mentioned in the present invention;

[0039] Figure 4 This is a schematic diagram of the operation of a multi-energy complementary heating and cooling system that efficiently utilizes geothermal energy and air energy in cooling mode as mentioned in the present invention.

[0040] Description of Reference Numerals

[0041] 1. The first valve; 2. The second valve; 3. The first water pump; 4. The buried pipe heat exchanger; 5. The third valve; 6. The second water pump; 7. The fourth valve; 8. The fifth valve; 9. The sixth valve; 10. The seventh valve; 11. The user terminal; 12. The eighth valve; 13. The dual-mode air source heat pump; 14. The water / water heat pump. DETAILED DESCRIPTION

[0042] The present invention will be further described below in conjunction with the accompanying drawings and details so that those skilled in the art can better understand the present invention and implement it, but the examples are not intended to limit the present invention.

[0043] For this purpose, refer to Figure 1 The present invention mentions a multi-energy complementary heating and cooling system that efficiently utilizes geothermal energy and air energy, including: a user terminal 11, a dual-mode air source heat pump 13, a water / water heat pump 14 and a buried pipe heat exchanger 4.

[0044] Among them, the user terminal 11 is used for indoor heating or cooling, the dual-mode air source heat pump 13 uses air energy as a low-temperature heat source to heat the heat exchange medium, and the water / water heat pump 14 is used to extract heat or cold and deliver it to the user; the buried pipe heat exchanger 4 is used for heat exchange between the heat exchange medium and the soil.

[0045] The present invention provides a multi-energy complementary heating and cooling system which efficiently utilizes geothermal energy and air energy, and includes two heating modes and two cooling modes.

[0046] Exemplarily, the heat exchange medium may be water or antifreeze, etc. It should be noted that when the outdoor system pipeline has an antifreeze requirement, due to the high cost of antifreeze, it is impossible to fill all pipelines of the entire system including the user terminal 11 with antifreeze, so a heat exchanger needs to be set in the user terminal 11.

[0047] It should be noted that the water / water heat pump 14 can have both heating and cooling functions through, but not limited to, a reversing device of the refrigerant circulation pipeline.

[0048] In the first heating mode, first, in one passage, the heat exchange medium exchanges heat with the soil in the underground heat exchanger 4, and absorbs heat by using the relatively constant temperature difference with the soil through the pre-buried underground pipeline system to achieve primary heating. In this passage, the heated heat exchange medium flows into the dual-mode air source heat pump 13. In this device, heat is absorbed from the air by means of the vapor compression cycle of the refrigerant, thereby further increasing the temperature of the heat exchange medium. Subsequently, the heat exchange medium is transported to the water / water heat pump 14, and the heat energy of the heat exchange medium is extracted and transported to the heat exchange medium in another passage through the internal refrigerant circulation. Finally, the fully heated heat exchange medium in the other passage is transported to the user terminal 11, and the stored heat energy is released to the living space through heat dissipation devices such as radiators, fan coils or floor radiation heating systems, thereby achieving the purpose of heating.

[0049] In the second heating mode, the dual-mode air source heat pump 13 extracts heat energy from the external air and transmits it to the heat exchange medium, which is then transmitted to the user terminal 11 for indoor heating.

[0050] In the second heating mode, the system does not involve a water / water heat pump 14 or a buried pipe heat exchanger 4. It uses a dual-condition air source heat pump 13 for heating alone. This mode operates when the outdoor ambient temperature is relatively high during the heating season. At this time, the user terminal 11 is directly connected to the condenser of the dual-condition air source heat pump 13, and the heat load is completely borne by the dual-condition air source heat pump 13.

[0051] In the first cooling mode, the ground pipe heat exchanger 4 is used to directly provide cooling. This mode is operated at the beginning of the cooling season when the user has a small cooling demand. The heat exchange medium is transported from the user terminal 11 to the ground pipe heat exchanger 4 and after heat exchange, it is transported back to the user terminal 11 for cooling. For example, the heat exchange medium can be water, and an insulated water tank needs to be set up to connect to the user terminal 11 for water supply.

[0052] In the second cooling mode, after the heat exchange medium is cooled in the buried pipe heat exchanger 4, it is transported to the water / water heat pump 14 to participate in heat exchange. The water / water heat pump 14 extracts the cold energy and transports it to the heat exchange medium in another passage, and then the second water pump 6 transports it back to the user terminal 11 for cooling.

[0053] It should be noted that the dual-mode air source heat pump 13 will face the problem of reduced efficiency when the outdoor temperature is low, especially when heating water to a higher temperature, its performance will be significantly reduced. In contrast, the heat exchange efficiency of the dual-mode air source heat pump 13 will be higher for heating low-temperature water, such as heating water from a lower temperature to a slightly higher temperature. For example, when the outdoor temperature is low (-5°C or even lower), the performance of using only the dual-condition air source heat pump 13 to heat water from 40°C to 45°C is very poor, but the performance of producing low-temperature water, such as heating water from 5°C to 10°C, is better. Therefore, when the outdoor ambient temperature is relatively low and the heat load is large during the heating season, the present application selects the first heating mode, and uses the dual-condition air source heat pump 13 and the water / water heat pump 14 in combination with the buried pipe heat exchanger 4 for joint heating. At this time, the heat source is jointly borne by air thermal energy and soil thermal energy; when the outdoor ambient temperature is relatively high during the heating season, the present application selects the second heating mode, and uses the dual-condition air source heat pump 13 to heat alone. The dual-condition air source heat pump 13 only takes heat from the air. By switching modes under different working conditions, the total amount of heat taken from the buried pipe can be reduced, thereby reducing the design capacity of the buried pipe and reducing the cost of the buried pipe. At the same time, the overall performance of the system remains very high.

[0054] The present invention realizes the deep joint utilization of air energy and soil heat energy through the flexible switching of the pipelines between the dual-condition air source heat pump 13 and the water / water heat pump 14, and makes full use of the heating capacity of the dual-condition air source heat pump 13, and effectively uses the water / water heat pump 14 in combination with soil energy to solve the problem of low energy efficiency coefficient of the dual-condition air source heat pump 13 when the outdoor environment is low. At the same time, while maintaining high energy efficiency, the system reduces the amount of heat taken from the soil, effectively reduces the number of buried pipes, reduces investment costs, and reduces the floor space.

[0055] The heating and cooling system mentioned in the present invention cleverly combines the advantages of air energy and soil energy, and automatically adjusts the operation strategy according to different environmental conditions. The system realizes the effective integration of the dual-mode air source heat pump 13 and the water / water heat pump 14 through a cleverly designed valve control mechanism, ensuring that the best energy efficiency ratio can be achieved under various operating environments. This dynamic conversion of modes not only fully utilizes the heating potential of various heat pumps, but also significantly reduces the demand for buried pipes, thereby greatly reducing the initial investment cost, while simplifying the system structure and improving the overall operating efficiency.

[0056] In summary, the present invention aims to create a new heating and cooling solution that can not only efficiently utilize natural resources but also take into account economy and simplicity, opening up a new path for green buildings and sustainable energy applications.

[0057] The present application will be further described below by way of embodiments in conjunction with the accompanying drawings:

[0058] It should be noted that in Figure 2 , Figure 3 and Figure 4 In the figure, the direction of the arrow indicates the flow direction of the heat exchange medium.

[0059] Example 1

[0060] like Figure 2 As shown, when the outdoor temperature is relatively low during the heating season and the direct heating efficiency of the dual-mode air source heat pump 13 is low, the combined heating mode, i.e., the first heating mode, is adopted. At this time, the second valve 2, the fourth valve 7, the sixth valve 9 and the eighth valve 12 are opened, the first water pump 3 and the second water pump 6 are opened, and the low-temperature water after use is discharged by the water / water heat pump 14 and transported to the underground pipe heat exchanger 4 through the first water pump 3 for heat exchange, and converges before entering the dual-mode air source heat pump 13. The dual-mode air source heat pump 13 operates in the vapor compression mode to further heat the water heated by the underground pipe using air energy, and transports it to the water / water heat pump 14 in the form of a heat source. The water / water heat pump 14 drives the compressor to extract heat and transport it to the condensation side heating return water to generate heating water, which is transported to the user terminal 11 by the second water pump 6 to meet the heating demand at a lower outdoor temperature during the heating season.

[0061] Example 2

[0062] like Figure 3 As shown, when the outdoor temperature is relatively high during the heating season and the energy efficiency level of the dual-condition air source heat pump 13 is relatively high, the capacity of the dual-condition air source heat pump 13 is sufficient to supply the current building heat load. At this time, the dual-condition air source heat pump 13 is used in a separate heating mode, that is, the second heating mode. At this time, the fifth valve 8 and the seventh valve 10 are opened, and the second water pump 6 is turned on. The used heating return water is sent to the condensing side of the dual-condition air source heat pump 13 for heating, and the high-temperature water that meets the heating demand is generated and sent to the user terminal 11 through the second water pump 6 for heating.

[0063] Example 3

[0064] like Figure 4 As shown, in the initial stage of cooling, when there is cooling demand on the user side but the demand is not large, the ground pipe heat exchanger 4 is used for direct cooling, that is, the first cooling mode. At this time, the first valve 1, the third valve 5 and the sixth valve 9 are opened, the first water pump 3 is turned on, and water is discharged from the indoor user terminal 11, driven by the first water pump 3 to be injected into the ground pipe heat exchanger 4 for cooling, and then the low-temperature water carrying cold is distributed to the user terminal 11 to meet the cooling demand.

[0065] Example 4

[0066] like Figure 2As shown, when the cooling demand is greater in summer and the direct cooling of the buried pipe is insufficient, the water / water heat pump 14 is used to operate the vapor compression refrigeration mode. At this time, the second valve 2, the fourth valve 7, the sixth valve 9 and the eighth valve 12 are opened, and the first water pump 3 and the second water pump 6 are opened. The heat exchange medium is driven by the first water pump 3 to cool down in the buried pipe heat exchanger 4, and then passes through the dual-mode air source heat pump 13 (the dual-mode air source heat pump 13 is not operating) to enter the water / water heat pump 14 to participate in heat exchange. The water / water heat pump 14 extracts the cold energy and delivers it to the user-side chilled water circulation, which is then delivered to the user terminal 11 by the second water pump 6 for cooling.

[0067] Obviously, the above is only an example for clear explanation and is not a limitation of the implementation method. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the protection scope of the invention.

[0068] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0069] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0071] In the description of this specification, the description of the terms "one", "some", "", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the or example are included in at least one or examples of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same or examples. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different or examples and the features of the different or examples described in this specification without contradiction.

[0072] Although the present invention has been shown and described above, it is to be understood that the above is exemplary and is not to be construed as limiting the present invention. A person skilled in the art may make changes, modifications, substitutions and variations to the above within the scope of the present invention.

Claims

1. A multi-energy complementary heating and cooling system that efficiently utilizes geothermal energy and air energy, characterized in that: include: User terminals, dual-mode air source heat pumps, water / water heat pumps and ground pipe heat exchangers; The user terminal is used for indoor heating or cooling, the dual-mode air source heat pump uses air energy as a low-temperature heat source to heat the heat exchange medium, and the water / water heat pump is used to extract heat or cold and deliver it to the user; the buried pipe heat exchanger is used for heat exchange between the heat exchange medium and the soil; In the first heating mode, after the heat exchange medium is heated in the ground pipe heat exchanger, it is transported to the dual-mode air source heat pump to be further heated and transported to the heat source side of the water / water heat pump to participate in heat exchange, and then transported back to the ground pipe heat exchanger to form a passage; The heat exchange medium is transported from the user side of the water / water heat pump to the user terminal for heating and then transported back to the water / water heat pump to form another path; The heat exchange medium in the two passages extracts and transports heat through the water / water heat pump; In the second heating mode, the heat exchange medium is heated by the dual-mode air source heat pump and then transported to the user terminal for heating, and then transported back to the dual-mode air source heat pump to form a passage; In the first cooling mode, the heat exchange medium is transported from the user terminal to the ground pipe heat exchanger for heat exchange, and then transported back to the user terminal for cooling, thereby forming a passage; In the second cooling mode, after the heat exchange medium is heat exchanged in the ground pipe heat exchanger, it is transported to the heat source side of the water / water heat pump to participate in heat exchange, and then transported back to the ground pipe heat exchanger to form a passage; The heat exchange medium is transported from the user side of the water / water heat pump to the user terminal for cooling and then transported back to the water / water heat pump to form another path; The heat exchange medium in the two passages extracts and transports heat through the water / water heat pump.

2. According to claim 1, a multi-energy complementary heating and cooling system that efficiently utilizes geothermal energy and air energy is characterized in that: The outlet end of the user terminal is connected to the user-side inlet end of the water / water heat pump through a pipeline; The user-side outlet end of the water / water heat pump is connected to the inlet end of the user terminal through a pipeline, and a second water pump is arranged on the pipeline; A sixth valve and a second valve are sequentially arranged on a pipeline connected from the outlet end of the user terminal to the user-side inlet end of the water / water heat pump; The heat source side outlet end of the water / water heat pump is connected to the inlet end of the ground pipe heat exchanger through a pipeline, and a first water pump is arranged on the pipeline; The outlet end of the underground heat exchanger is connected to the inlet end of the dual-mode air source heat pump through a pipeline, and a fourth valve is arranged on the pipeline; The outlet end of the dual-mode air source heat pump is connected to the heat source side inlet end of the water / water heat pump through a pipeline, and an eighth valve is arranged on the pipeline.

3. A multi-energy complementary heating and cooling system for efficiently utilizing geothermal energy and air energy according to claim 2, characterized in that: A sixth valve and a second valve are sequentially arranged on a pipeline connecting the outlet of the user terminal to the user-side inlet of the water / water heat pump, wherein a branch is arranged between the second valve and the sixth valve to connect to the inlet of the first water pump, and a first valve is arranged on the branch.

4. The multi-energy complementary heating and cooling system for efficiently utilizing geothermal energy and air energy according to claim 2 is characterized in that: The outlet end of the dual-mode air source heat pump is connected to the inlet end of the second water pump through a pipeline, and a seventh valve is arranged on the pipeline.

5. The multi-energy complementary heating and cooling system for efficiently utilizing geothermal energy and air energy according to claim 3 is characterized in that: A fourth valve is arranged on the pipeline connecting the outlet end of the buried pipe heat exchanger and the inlet end of the dual-condition air source heat pump, a branch is arranged between the inlet end of the dual-condition air source heat pump and the fourth valve to connect to the outlet end of the user end, and a fifth valve is arranged on the branch.

6. The multi-energy complementary heating and cooling system for efficiently utilizing geothermal energy and air energy according to claim 5 is characterized in that: A branch is arranged on the pipeline connected with the outlet end of the buried pipe heat exchanger and the fourth valve and connected with the inlet end of the user end, and a third valve is arranged on the branch.

7. The multi-energy complementary heating and cooling system for efficiently utilizing geothermal energy and air energy according to claim 1 is characterized in that: A heat exchanger is arranged at the connection point between the user terminal and the outdoor composite heat pump system pipeline. When there is no need for antifreeze in the system pipeline, the user terminal is directly connected to the outdoor pipeline; When there is a need to protect the system pipeline from freezing, the heat exchanger provides an indirect connection method for transferring heat to the water in the user's terminal pipeline.

8. The multi-energy complementary heating and cooling system for efficiently utilizing geothermal energy and air energy according to claim 1 is characterized in that: The dual-operating conditions of the dual-operating condition air source heat pump include: a condition for producing low-temperature hot water and a condition for producing heating water.

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