Multi-source coupled mid-deep ground source heat pump system and operation method

Abstract

The present invention discloses a multi-source coupled medium-deep geothermal heat pump system, comprising a heat pump unit, a user unit, a constant pressure water replenishment unit, a medium-deep geothermal source unit, a heat exchange unit, and an energy storage unit. The medium-deep geothermal source unit comprises an underground pipe buried in the medium-deep stratum, a ground source side water supply pipeline connected to the underground pipe, a ground source side return pipeline, and a ground source side circulation pump group; the energy storage unit comprises a solar heat collection unit, a solar water supply pipe, and a solar return pipe. The solar water supply pipe is connected to the ground source side return pipeline, and the solar return pipe is connected to the ground source side water supply pipeline. The present invention couples solar energy, a medium-deep geothermal heat pump, and an air source heat pump. The combination of multiple renewable energy sources realizes heating and cooling. It can also store heat in the ground source across seasons to provide sufficient heat for the heating season, thereby meeting the heating demand in the heating season and improving heating energy efficiency. In summer, the air source heat pump unit can be used for cooling, so that the traditional medium-deep geothermal heat pump system has a cooling function.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and in particular to a multi-source coupled mid-deep ground source heat pump system and an operating method thereof. Background Art

[0002] Medium-deep casing-type ground-source heat pump systems extract geothermal energy from 2km to 3km underground through indirect heat exchange. However, the high cost of heat exchange units on the ground-source side of these systems, coupled with the high outlet water temperature on the ground-source side, generally limits their application to heating, not cooling. This, to a certain extent, limits their widespread application. Therefore, combining medium-deep ground-source heat with other energy sources for both heating and cooling is crucial for these systems. Summary of the Invention

[0003] In view of this, the present invention provides a multi-source coupled medium-deep geothermal heat pump system and also provides an operating method of the multi-source coupled medium-deep geothermal heat pump system.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The multi-source coupled medium-deep geothermal heat pump system of the present invention includes a heat pump unit, a user unit, a constant pressure water replenishment unit, a medium-deep geothermal source unit, a heat exchange unit, and an energy storage unit. The medium-deep geothermal source unit includes a buried pipe buried in the medium-deep stratum, a ground source side water supply pipeline connected to the buried pipe, a ground source side return pipeline, and a ground source side circulation pump group;

[0006] The energy storage unit includes a solar thermal collection unit, a solar water supply pipe connected to the water outlet of the solar thermal collection unit, and a solar water return pipe connected to the water inlet of the solar thermal collection unit, wherein the solar water supply pipe is provided with a fifth valve and is connected to the ground source side water return pipe, and the solar water return pipe is provided with a sixth valve and is connected to the ground source side water supply pipe;

[0007] The heat pump unit includes at least one water-source heat pump unit and at least one dual-source heat pump unit, wherein the dual-source heat pump unit is an air-source and water-source composite heat pump unit, wherein the condenser inlet of the dual-source heat pump unit and the condenser inlet of the water-source heat pump unit are both connected to the first return water pipeline, and the condenser outlet of the dual-source heat pump unit and the condenser outlet of the water-source heat pump unit are both connected to the first water supply pipeline;

[0008] The user unit includes a user end, a user-side circulation pump group, a user-side return pipe connected to the user end, and a user-side water supply pipe. The first water supply pipe is provided with a third valve and is connected to the user-side water supply pipe. The first return pipe is provided with a fourth valve and is connected to the user-side return pipe.

[0009] The heat exchange unit includes a first heat exchanger and a second heat exchanger, wherein the primary water inlet of the first heat exchanger is connected to the ground source side water supply pipeline, the primary side water outlet of the first heat exchanger is connected to the primary side water inlet of the second heat exchanger, and the primary side water outlet of the second heat exchanger is connected to the ground source side return water pipeline;

[0010] The evaporator outlet of the water source heat pump unit is connected to the secondary water inlet of the second heat exchanger through the second pipe I, and the secondary water outlet of the second heat exchanger is connected to the evaporator return water outlet of the water source heat pump unit through the second pipe II; the secondary water inlet of the first heat exchanger is connected to the third pipe III, the other end of the third pipe III is divided into two paths, one path is connected to the evaporator outlet of the dual-source heat pump unit, and the other path is provided with a first valve and connected to the user-side water supply pipeline, the secondary water outlet of the first heat exchanger is connected to the fourth pipe IV, the other end of the fourth pipe IV is divided into two paths, one path is connected to the evaporator water inlet of the dual-source heat pump unit, and the other path is provided with a second valve and connected to the user-side return water pipeline;

[0011] Among them, the primary water inlet, primary water outlet, secondary water inlet and secondary water outlet of the first heat exchanger are respectively provided with the seventh valve, the eighth valve, the ninth valve and the tenth valve; the primary water outlet, secondary water inlet and secondary water outlet of the second heat exchanger are respectively provided with the eleventh valve, the twelfth valve and the thirteenth valve. The beneficial effects are as follows: the present invention couples solar energy, medium-deep ground source heat pumps and air source heat pumps together, and the combination of multiple renewable energy sources realizes heating and cooling. It can also store heat in the ground source across seasons to provide sufficient heat for the heating season, thereby meeting the heating demand in the heating season and improving heating energy efficiency. In summer, the air source heat pump unit can be used for cooling, so that the traditional medium-deep ground source heat pump system has a cooling function.

[0012] Preferably, there are at least two user-side circulating pump groups connected in parallel, and at least two ground source side circulating pump groups connected in parallel. There are at least two circulating pump groups, which can be one standby and one in use or two in use and one in standby, to ensure the normal operation of the system; both the user-side return water pipeline and the ground source side water supply pipeline are provided with exhaust precipitators.

[0013] Preferably, the constant pressure water replenishment unit includes a first constant pressure water replenishment device and a second constant pressure water replenishment device connected to softened water. The second constant pressure water replenishment device is connected to the user side water supply pipeline through a second expansion tube and a second circulation tube. The first constant pressure water replenishment device is connected to the ground source side water supply pipeline through a first expansion tube and a first circulation tube to ensure the circulating water volume and water pressure of each cycle.

[0014] Preferably, the buried pipe is a casing-type buried pipe. During installation, the casing-type buried pipe can adopt an inside-in, outside-out heat exchange mode or an outside-in, inside-out heat exchange mode.

[0015] The present invention also provides an operating method for a multi-source coupled medium- and deep-layer geothermal heat pump system, the operating method including an air-source heat pump heating condition, a medium- and deep-layer geothermal heat pump heating condition, a solar cross-seasonal heat storage condition, and an air-source heat pump cooling condition. The air-source heat pump heating condition is as follows: the third valve, the fourth valve, and the user-side circulation pump group are opened, and the condenser of the dual-source heat pump unit and the user end form an air-source heating circulation loop;

[0016] The medium-deep geothermal heat pump heating operating conditions are as follows: open the third valve, the fourth valve, the user-side circulation pump group, the geothermal-side circulation pump group, the valves at each port of the first heat exchanger, and the valves at each port of the second heat exchanger. The water in the buried pipe enters a channel of the first heat exchanger and a channel of the second heat exchanger in sequence through the geothermal-side water supply pipeline, and flows back to the geothermal-side return pipeline from the primary-side water outlet of the second heat exchanger, forming a geothermal-side circulation loop.

[0017] The evaporator of the dual-source heat pump unit forms a first heat exchange circulation loop through the third pipe III, the third pipe IV and the secondary side of the first heat exchanger; the evaporator of the water-source heat pump unit forms a second heat exchange circulation loop through the second pipe I, the second pipe II and the secondary side of the second heat exchanger; the condenser of the dual-source heat pump unit and the condenser of the water-source heat pump unit are both connected to the user end, forming a heat pump heating circulation loop;

[0018] The solar heat storage inter-seasonal working condition is as follows: the fifth valve, the sixth valve and the ground source side circulation pump group are opened to form a solar heat storage circulation loop between the solar heat collection unit and the buried pipe;

[0019] The air source heat pump cooling operating conditions are as follows: open the first valve, the second valve and the user-side circulation pump group, and the evaporator of the dual-source heat pump unit and the user end form an air source cooling circulation loop.

[0020] Compared with the existing technology, the present invention couples solar energy, medium-deep ground source heat pumps and air source heat pumps together, and combines multiple renewable energy sources to achieve heating and cooling. It can also store heat in the ground source across seasons to provide sufficient heat for the heating season, thereby meeting the heating demand in the heating season and improving heating energy efficiency. In summer, air source heat pump units can be used for cooling, so that the traditional medium-deep ground source heat pump system has a cooling function. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the present invention.

[0022] Figure 2 It is a schematic diagram of the air source heat pump heating working condition of the present invention.

[0023] Figure 3 It is a schematic diagram of the deep ground source heat pump heating condition of the present invention.

[0024] Figure 4 It is a schematic diagram of the cooling working condition of the air source heat pump of the present invention.

[0025] Figure 5 It is a schematic diagram of the solar energy cross-seasonal heat storage working condition of the present invention.

[0026] Figure 6 It is a schematic diagram of the joint heating of the solar thermal collection unit and the air source heat pump of the present invention. DETAILED DESCRIPTION

[0027] The following describes an embodiment of the present invention in detail with reference to the accompanying drawings. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process. However, the protection scope of the present invention is not limited to the following embodiment.

[0028] It should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "connected" and "connection" that may appear should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood based on specific circumstances.

[0029] like Figure 1 As shown, the multi-source coupled medium-deep geothermal heat pump system of the present invention includes a heat pump unit C, a user unit D, a constant pressure water replenishment unit F, a medium-deep geothermal unit A, a heat exchange unit B and an energy storage unit E. The medium-deep geothermal unit A includes a buried pipe A1 buried in the medium-deep stratum (preferably a casing-type buried pipe, shown in the figure as external inlet and internal outlet, of course, it can also be internal inlet and external outlet), a ground source side water supply pipeline A2 connected to the buried pipe A1, a ground source side return water pipeline A3 and a ground source side circulation pump group A4. The ground source side circulation pump group A4 (including a pump and a valve group) is installed on the ground source side water supply pipeline A2. The ground source side circulation pump group A4 consists of three groups and is connected in parallel (two for use and one for backup).

[0030] The energy storage unit E includes a solar thermal collection unit E1, a solar water supply pipe E2 connected to the water outlet of the solar thermal collection unit E1, and a solar water return pipe E3 connected to the water inlet of the solar thermal collection unit E1. The solar water supply pipe E2 is provided with a fifth valve V5 and is connected to the ground source side return pipe A3. The solar water return pipe E3 is provided with a sixth valve V6 and is connected to the ground source side water supply pipe A2.

[0031] The heat pump unit C includes a group of water-source heat pump units C1 (of course, it can also be two or more groups) and a group of dual-source heat pump units C2 (of course, it can also be two or more groups). The dual-source heat pump unit C2 is an air-source and water-source composite heat pump unit. The condenser inlet of the dual-source heat pump unit C2 and the condenser inlet of the water-source heat pump unit C1 are both connected to the first return water pipeline C3. The condenser outlet of the dual-source heat pump unit C2 and the condenser outlet of the water-source heat pump unit C1 are both connected to the first water supply pipeline C4. The first water supply pipeline C4 is connected to the user-side water supply pipeline D3 of the user unit D, and the first return water pipeline C3 is connected to the user-side return water pipeline D2 of the user unit D.

[0032] The user unit D includes a user end, a user-side circulation pump group D1, a user-side return pipe D2 connected to the user end, and a user-side water supply pipe D3. A third valve V3 is provided on the first water supply pipe C4 and is connected to the user-side water supply pipe D3. A fourth valve V4 is provided on the first return pipe C3 and is connected to the user-side return pipe D2, thereby realizing the connection between the heat pump unit and the user unit D to ensure heating and cooling.

[0033] The heat exchange unit B includes a first heat exchanger B1 and a second heat exchanger B2. The primary water inlet of the first heat exchanger B1 is connected to the ground source side water supply pipeline A2. The primary water outlet of the first heat exchanger B1 is connected to the primary water inlet of the second heat exchanger B2. The primary water outlet of the second heat exchanger B2 is connected to the ground source side return water pipeline A3.

[0034] The evaporator outlet of the water source heat pump unit C1 is connected to the secondary side water inlet of the second heat exchanger B2 through the second pipe I, and the secondary side water outlet of the second heat exchanger B2 is connected to the evaporator return water outlet of the water source heat pump unit C1 through the second pipe II; the secondary side water inlet of the first heat exchanger B1 is connected to the third pipe III, the other end of the third pipe III is divided into two paths, one path is connected to the evaporator outlet of the dual-source heat pump unit C2, and the other path is provided with a first valve V1 and connected to the user-side water supply pipe D3, the secondary side water outlet of the first heat exchanger B1 is connected to the fourth pipe IV, the other end of the fourth pipe IV is divided into two paths, one path is connected to the evaporator water inlet of the dual-source heat pump unit C2, and the other path is provided with a second valve V2 and connected to the user-side return water pipe D2;

[0035] The first heat exchanger B1's primary water inlet, primary water outlet, secondary water inlet, and secondary water outlet are each equipped with a seventh valve V7, an eighth valve V8, a ninth valve V9, and a tenth valve V10, respectively. The second heat exchanger B2's primary water outlet, secondary water inlet, and secondary water outlet are each equipped with an eleventh valve V11, a twelfth valve V12, and a thirteenth valve V13, respectively. When heat exchange is required, the valves at the four ports of the first heat exchanger B1 and the four ports of the second heat exchanger B2 are all open. When heat exchange is not required, the valves at the four ports of the first heat exchanger B1 and the four ports of the second heat exchanger B2 are all closed.

[0036] During actual installation, exhaust precipitators are installed on both the user-side return pipe D2 and the ground source-side water supply pipe A2 to ensure the water quality in the circulation loop and reduce the impact of circulating water on equipment and pipelines.

[0037] Combine Figure 1 It can be seen that the constant pressure water replenishment unit F includes a first constant pressure water replenishment device F2 and a constant pressure water replenishment device F3 connected to softened water. The second expansion pipe and the second circulation pipe of the second constant pressure water replenishment device F3 are connected to the user-side water supply pipeline D3 to provide constant pressure water replenishment for the user-side circulation loop to ensure normal heating and cooling; the first expansion pipe and the first circulation pipe of the first constant pressure water replenishment device F2 are connected to the ground source side water supply pipeline to provide constant pressure water replenishment for the ground source side circulation loop; the constant pressure water replenishment unit F also includes a connected softened water device and a softened water tank F1. The softened water tank F1 is connected to the first heat exchanger B1, the second heat exchanger B2, and the solar thermal collection unit E1 through a water replenishment pipe to provide softened water to the secondary side of the first heat exchanger B1, the second heat exchanger B2 and the solar thermal collection unit E1.

[0038] The present invention also provides an operating method for a multi-source coupled medium- and deep-layer geothermal heat pump system, including air-source heat pump heating conditions, medium- and deep-layer geothermal heat pump heating conditions, solar cross-seasonal heat storage conditions, and air-source heat pump cooling conditions. Specifically, in the early and late stages of heating, when the building heat load is relatively small, the air-source heat pump heating condition can be utilized. Under this condition, the third valve V3, the fourth valve V4, and the user-side circulation pump group D1 are opened, and all other valves and the geothermal-side circulation pump group A4 are closed, so that the condenser of the dual-source heat pump unit C2 and the user end form an air-source heating circulation loop. For details, see Figure 2 During operation, the dual-source heat pump unit C2 operates in air source mode, indirectly transferring the heat in the air to the user side through heat exchange, thereby achieving heating.

[0039] In the middle of heating period, the heat load of the building is large, and the heat from the middle and deep ground source is used for heating (i.e. starting the middle and deep ground source heat pump heating mode): Figure 3It can be seen that the third valve V3, the fourth valve V4, the user-side circulation pump group D1, the ground source side circulation pump group A4, the valves at each port of the first heat exchanger B1 and the valves at each port of the second heat exchanger B2 are opened, and the first valve V1, the second valve V2, the fifth valve V5 and the sixth valve V6 are closed; the water in the buried pipe A1 (absorbing geothermal energy) enters a channel of the first heat exchanger B1 and a channel of the second heat exchanger B2 in sequence through the ground source side water supply pipeline A2, and flows back to the ground source side return water pipeline A3 from the primary side water outlet of the second heat exchanger B2, forming a ground source side circulation loop; the evaporator of the dual-source heat pump unit C2 passes through the third pipeline III and the third pipeline Ⅳ and the secondary side of the first heat exchanger B1 form a first heat exchange circulation loop, thereby absorbing geothermal heat; the evaporator of the water source heat pump unit C1 forms a second heat exchange circulation loop with the secondary side of the second heat exchanger B2 through the second pipeline I and the second pipeline II, thereby absorbing geothermal heat; the water outlets of the condenser of the dual-source heat pump unit C2 and the condenser of the water source heat pump unit C1 are connected to the user-side water supply pipeline D3 through the first water supply pipeline C4, and the water inlets of the condenser of the dual-source heat pump unit C2 and the condenser of the water source heat pump unit C1 are connected to the user-side return pipeline D2 through the first return pipeline C3, thereby forming a heating circulation loop, thereby utilizing the mid-deep geothermal heat for heating.

[0040] In the non-heating season, solar energy can be used to store ground source heat to achieve cross-seasonal heat storage (i.e., solar cross-seasonal heat storage working condition), thereby meeting winter heating needs: open the fifth valve V5, the sixth valve V6 and the ground source side circulation pump group A4, close all other valves and the user side circulation pump group D1, so that a solar heat storage circulation loop is formed between the solar heat collection unit E1 and the buried pipe A1. The hot water of the solar heat collection unit E1 enters the buried pipe A1 and transfers the heat to the ground source through heat exchange. For details, see Figure 5 .

[0041] In the cooling season (mainly in summer), air source heat pump can be used for cooling (i.e. air source heat pump cooling mode): Figure 4 It can be seen that when the first valve V1, the second valve V2 and the user-side circulation pump group D1 are opened, and all other valves and the ground-source-side circulation pump group A4 are closed (the solar thermal collection unit E1, the heat exchange unit B and the ground-source unit are all in a non-operating state), the evaporator of the dual-source heat pump unit C2 (the working mode is the air-source heat pump mode) and the user end form an air-source cooling circulation loop to provide cooling for the user end.

[0042] In the present invention, the solar water supply pipe E2 of the solar thermal unit E1 is connected to the first water supply pipe C4, and the solar return pipe E3 is connected to the first return pipe C3, so that the solar thermal unit E1 and the user end form a heating loop. In actual operation, the solar thermal unit E1 can be used alone for heating, or the solar thermal unit E1 heating can be combined with the air source heat pump heating mode, or the solar thermal unit E1 heating can be combined with the medium and deep ground source heat pump heating mode to reduce the energy consumption of the heat pump unit C during the heating season, save energy and reduce emissions. For details, see Figure 6 Of course, in actual projects, the two pipes of the solar thermal collection unit E1 can be connected to the evaporators of the two heat pump units respectively, and the heat can be indirectly transferred to the circulating water in the heating cycle through the evaporator. In winter, it can work alone or be combined with deep geothermal heating to provide heating.

[0043] The present invention couples solar energy, medium-deep ground source heat pumps and air source heat pumps together, and combines multiple renewable energy sources to achieve heating and cooling. It can also store heat in the ground source across seasons to provide sufficient heat for the heating season, thereby meeting the heating demand in the heating season and improving heating energy efficiency. In summer, air source heat pump units can be used for cooling, so that the traditional medium-deep ground source heat pump system has a cooling function.

[0044] Finally, it should be emphasized that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Therefore, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A multi-source coupled medium-deep ground source heat pump system, comprising a heat pump unit, a user unit, and a constant pressure water supply unit, characterized in that: It also includes a medium-deep layer ground source unit, a heat exchange unit and an energy storage unit, wherein the medium-deep layer ground source unit includes a buried pipe buried in the medium-deep layer, a ground source side water supply pipeline connected to the buried pipe, a ground source side return pipeline and a ground source side circulation pump group; The energy storage unit includes a solar thermal collection unit, a solar water supply pipe connected to the water outlet of the solar thermal collection unit, and a solar water return pipe connected to the water inlet of the solar thermal collection unit, wherein the solar water supply pipe is provided with a fifth valve and is connected to the ground source side water return pipe, and the solar water return pipe is provided with a sixth valve and is connected to the ground source side water supply pipe; The heat pump unit includes at least one water-source heat pump unit and at least one dual-source heat pump unit, wherein the dual-source heat pump unit is an air-source and water-source composite heat pump unit, wherein the condenser inlet of the dual-source heat pump unit and the condenser inlet of the water-source heat pump unit are both connected to the first return water pipeline, and the condenser outlet of the dual-source heat pump unit and the condenser outlet of the water-source heat pump unit are both connected to the first water supply pipeline; The user unit includes a user end, a user-side circulation pump group, a user-side return pipe connected to the user end, and a user-side water supply pipe. The first water supply pipe is provided with a third valve and is connected to the user-side water supply pipe. The first return pipe is provided with a fourth valve and is connected to the user-side return pipe. The heat exchange unit includes a first heat exchanger and a second heat exchanger, wherein the primary water inlet of the first heat exchanger is connected to the ground source side water supply pipeline, the primary side water outlet of the first heat exchanger is connected to the primary side water inlet of the second heat exchanger, and the primary side water outlet of the second heat exchanger is connected to the ground source side return water pipeline; The evaporator outlet of the water source heat pump unit is connected to the secondary water inlet of the second heat exchanger through the second pipe I, and the secondary water outlet of the second heat exchanger is connected to the evaporator return water outlet of the water source heat pump unit through the second pipe II; the secondary water inlet of the first heat exchanger is connected to the third pipe III, the other end of the third pipe III is divided into two paths, one path is connected to the evaporator outlet of the dual-source heat pump unit, and the other path is provided with a first valve and connected to the user-side water supply pipeline, the secondary water outlet of the first heat exchanger is connected to the fourth pipe IV, the other end of the fourth pipe IV is divided into two paths, one path is connected to the evaporator water inlet of the dual-source heat pump unit, and the other path is provided with a second valve and connected to the user-side return water pipeline; The primary water inlet, primary water outlet, secondary water inlet and secondary water outlet of the first heat exchanger are respectively provided with a seventh valve, an eighth valve, a ninth valve and a tenth valve; The eleventh valve, the twelfth valve and the thirteenth valve are respectively provided at the primary water outlet, the secondary water inlet and the secondary water outlet of the second heat exchanger.

2. The multi-source coupled mid-deep ground source heat pump system according to claim 1, characterized in that: There are at least two user-side circulating pump groups connected in parallel, and at least two ground source-side circulating pump groups connected in parallel; both the user-side return water pipeline and the ground source-side water supply pipeline are provided with an exhaust precipitator.

3. The multi-source coupled mid-deep ground source heat pump system according to claim 1, characterized in that: The constant pressure water replenishment unit includes a first constant pressure water replenishment device and a second constant pressure water replenishment device connected to softened water. The second constant pressure water replenishment device is connected to the user side water supply pipeline through a second expansion pipe and a second circulation pipe. The first constant pressure water replenishment device is connected to the ground source side water supply pipeline through a first expansion pipe and a first circulation pipe.

4. The multi-source coupled mid-deep ground source heat pump system according to claim 1, characterized in that: The buried pipe is a casing type buried pipe.

5. A method for operating the multi-source coupled mid- to deep-seated ground source heat pump system according to claim 1, characterized in that: The operation method includes air source heat pump heating conditions, medium and deep ground source heat pump heating conditions, solar energy cross-seasonal heat storage conditions, and air source heat pump cooling conditions; The air source heat pump heating operating conditions are as follows: the third valve, the fourth valve and the user-side circulation pump group are opened, and the condenser of the dual-source heat pump unit and the user end form an air source heating circulation loop; The medium-deep geothermal heat pump heating operating conditions are as follows: open the third valve, the fourth valve, the user-side circulation pump group, the geothermal-side circulation pump group, the valves at each port of the first heat exchanger, and the valves at each port of the second heat exchanger. The water in the buried pipe enters a channel of the first heat exchanger and a channel of the second heat exchanger in sequence through the geothermal-side water supply pipeline, and flows back to the geothermal-side return pipeline from the primary-side water outlet of the second heat exchanger, forming a geothermal-side circulation loop. The evaporator of the dual-source heat pump unit forms a first heat exchange circulation loop through the third pipe III, the third pipe IV and the secondary side of the first heat exchanger; the evaporator of the water-source heat pump unit forms a second heat exchange circulation loop through the second pipe I, the second pipe II and the secondary side of the second heat exchanger; the condenser of the dual-source heat pump unit and the condenser of the water-source heat pump unit are both connected to the user end, forming a heat pump heating circulation loop; The solar heat storage inter-seasonal working condition is as follows: the fifth valve, the sixth valve and the ground source side circulation pump group are opened to form a solar heat storage circulation loop between the solar heat collection unit and the buried pipe; The air source heat pump cooling operating conditions are as follows: open the first valve, the second valve and the user-side circulation pump group, and the evaporator of the dual-source heat pump unit and the user end form an air source cooling circulation loop.

Images