Multi-source coupling middle-deep layer ground source heat pump system and operation method

Abstract

The invention discloses a multi-source coupling middle-deep layer ground source heat pump system which comprises a heat pump unit, a user unit, a constant-pressure water supplementing unit, a middle-deep layer ground source unit, a heat exchange unit and an energy storage unit. The middle-deep layer ground source unit comprises a buried pipe buried in a middle-deep layer stratum, a ground source side water supply pipeline connected with the buried pipe, a ground source side water return pipeline and a ground source side circulating pump set. The energy storage unit comprises a solar heat collection unit, a solar water supply pipe and a solar water return pipe, the solar water supply pipe is connected with the ground source side water return pipeline, and the solar water return pipe is connected with the ground source side water supply pipeline. Solar energy, a middle-deep layer ground source heat pump and an air source heat pump are coupled together, multiple renewable energy sources are combined to achieve heating and cooling, cross-season heat storage can be conducted in a ground source, enough heat is provided for the heating season, then the heat taking requirement of the heating season is met, and the heating energy efficiency is improved; in summer, the air source heat pump unit can be used for cooling, so that a traditional medium-deep layer ground source 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 geothermal heat pump system and an operation method thereof. Background Art

[0002] The medium-deep casing type buried pipe ground source heat pump system extracts geothermal energy 2km to 3km underground through indirect heat exchange. The cost of the heat exchange unit on the medium-deep casing type ground source side is relatively high, and the outlet water temperature on the buried pipe side is relatively high. It can generally only be used for heating, not for cooling, which in turn limits the promotion and application of the medium-deep casing type buried pipe ground source heat pump system to a certain extent. Therefore, it is crucial for the medium-deep casing type buried pipe ground source heat pump system to combine the medium-deep ground source with other energy sources for heating and cooling. Summary of the invention

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

[0004] To achieve the above object, the present invention adopts the following technical solutions: The multi-source coupled medium-deep geothermal heat pump system of the present invention comprises 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 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 water 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, the solar water supply pipe is provided with a fifth valve and connected to the ground source side water return pipe, and the solar water return pipe is provided with a sixth valve and connected to the ground source side water supply pipe; The heat pump unit comprises 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 water pipeline connected to the user end, and a user side water supply pipeline, the first water supply pipeline is provided with a third valve and connected to the user side water supply pipeline, the first return water pipeline is provided with a fourth valve and connected to the user side return water pipeline; The heat exchange unit comprises 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 water return pipeline; The evaporator outlet of the water source heat pump unit is connected to the secondary side water inlet of the second heat exchanger through the second pipeline I, and the secondary side 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 pipeline II; the secondary side water inlet of the first heat exchanger is connected to the third pipeline III, and the other end of the third pipeline III is divided into two paths, one of which is connected to the evaporator outlet of the dual-source heat pump unit, and the other is provided with a first valve and connected to the user-side water supply pipeline. The secondary side water outlet of the first heat exchanger is connected to the fourth pipeline IV, and the other end of the fourth pipeline IV is divided into two paths, one of which is connected to the evaporator water inlet of the dual-source heat pump unit, and the other is provided with a second valve and connected to the user-side water return pipeline; 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: the present invention couples solar energy, medium-deep ground source heat pumps and air source heat pumps together, and a variety of renewable energy sources are combined to achieve heating and cooling. It can also store heat in the ground source across seasons to provide enough heat for the heating season, thereby meeting the heating demand in the heating season and improving the 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.

[0005] 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 backup and one in use or two in use and one backup, 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.

[0006] 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, and 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.

[0007] 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 method or an outside-in, inside-out heat exchange method.

[0008] The present invention also provides an operation method of a multi-source coupled medium-deep geothermal heat pump system, the operation method includes an air source heat pump heating condition, a medium-deep geothermal heat pump heating condition, a solar energy cross-seasonal heat storage condition, and an air source heat pump cooling condition, wherein 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; The heating working condition of the medium-deep geothermal heat pump is as follows: open the third valve, the fourth valve, the user-side circulation pump group, the ground source side circulation pump group, the valve at each port of the first heat exchanger and the valve at each port of the second heat exchanger, and 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 ground source side water supply pipeline, and flows back to the ground source side return water pipeline from the primary side water outlet of the second heat exchanger, forming a ground source side circulation loop; The evaporator of the dual-source heat pump unit forms a first heat exchange circulation loop through the third pipeline III, the third pipeline 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 pipeline I, the second pipeline 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 to form a heat pump heating circulation loop; The solar inter-seasonal heat storage 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 working condition is 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.

[0009] Compared with the existing technology, the present invention couples solar energy, medium-deep geothermal 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 geothermal heat pump system has a cooling function. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the present invention.

[0011] Figure 2 It is a schematic diagram of the air source heat pump heating condition of the present invention.

[0012] Figure 3 It is a schematic diagram of the deep ground source heat pump heating condition in the present invention.

[0013] Figure 4 It is a schematic diagram of the cooling working condition of the air source heat pump of the present invention.

[0014] Figure 5 It is a schematic diagram of the solar energy cross-seasonal heat storage working condition of the present invention.

[0015] 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

[0016] The following is a detailed description of an embodiment of the present invention in conjunction with the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0017] It should be pointed out that in the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connection" that may appear 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] like Figure 1 As shown, the multi-source coupled medium-deep geothermal heat pump system of the present invention comprises 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 comprises a buried pipe A1 (preferably a casing-type buried pipe, which is shown as an outside-in and inside-out in the figure, but can also be an inside-in and outside-out) buried in the medium-deep stratum, 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 is three groups and connected in parallel (two for use and one for standby); 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 water 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. 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. The user unit D includes a user end, a user-side circulating 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. The heat exchange unit B includes a first heat exchanger B1 and a second heat exchanger B2, the primary side water inlet of the first heat exchanger B1 is connected to the ground source side water supply pipeline A2, the primary side water outlet of the first heat exchanger B1 is connected to the primary side water inlet of the second heat exchanger B2, and the primary side water outlet of the second heat exchanger B2 is connected to the ground source side return water pipeline A3; 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 pipeline 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 pipeline II; the secondary side water inlet of the first heat exchanger B1 is connected to the third pipeline III, and the other end of the third pipeline III is divided into two paths, one of which is connected to the evaporator outlet of the dual-source heat pump unit C2, and the other is provided with a first valve V1 and connected to the user-side water supply pipeline D3, and the secondary side water outlet of the first heat exchanger B1 is connected to the fourth pipeline IV, and the other end of the fourth pipeline IV is divided into two paths, one of which is connected to the evaporator water inlet of the dual-source heat pump unit C2, and the other is provided with a second valve V2 and connected to the user-side return water pipeline D2; Among them, the primary water inlet, primary water outlet, secondary water inlet and secondary water outlet of the first heat exchanger B1 are respectively provided with the seventh valve V7, the eighth valve V8, the ninth valve V9 and the tenth valve V10; the primary water outlet, secondary water inlet and secondary water outlet of the second heat exchanger B2 are respectively provided with the eleventh valve V11, the twelfth valve V12 and the thirteenth valve V13. When heat exchange is required, the valves at the four ports of the first heat exchanger B1 and the valves at the four ports of the second heat exchanger B2 are all in the open state; when heat exchange is not required, the valves at the four ports of the first heat exchanger B1 and the valves at the four ports of the second heat exchanger B2 are all in the closed state; 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 pipes.

[0019] Combination 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 energy collection unit E1 through a water replenishment pipe to provide softened water for the secondary side of the first heat exchanger B1, the second heat exchanger B2 and the solar energy collection unit E1.

[0020] The present invention also provides an operation method of a multi-source coupled medium-deep geothermal heat pump system, including air source heat pump heating conditions, medium-deep geothermal heat pump heating conditions, solar energy cross-seasonal heat storage conditions, and air source heat pump cooling conditions. Specifically, in the early and late stages of heating, the building heat load is relatively small. At this time, the air source heat pump heating condition can be used. Under this condition: open the third valve V3, the fourth valve V4, and the user-side circulation pump group D1, close all other valves and the ground source side circulation pump group A4, so that the condenser of the dual-source heat pump unit C2 and the user end form an air source heating circulation loop. See specifically Figure 2 During operation, the dual-source heat pump unit C2 operates in air source mode, transferring the heat in the air to the user side indirectly through heat exchange, thereby achieving heating.

[0021] In the middle of heating, the heat load of the building is large, and the heat from the middle and deep ground sources is used for heating (i.e., the middle and deep ground source heat pump heating condition is started): combined with 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 turn 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 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, and then absorb 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, and absorbs 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, forming a heating circulation loop, and then using the middle and deep geothermal heat for heating.

[0022] In the non-heating season, solar energy can be used to store heat in the ground source to achieve cross-seasonal heat storage (i.e., solar energy cross-seasonal heat storage working condition), thereby meeting the winter heating demand: 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, and the hot water of the solar heat collection unit E1 enters the buried pipe A1, and the heat is transferred to the ground source through heat exchange. For details, see Figure 5 .

[0023] In the cold season (mainly in summer), air source heat pump can be used for cooling (i.e. air source heat pump cooling condition): combined with Figure 4 It can be seen that by opening the first valve V1, the second valve V2 and the user-side circulating pump group D1, and closing all other valves and the ground source side circulating pump group A4 (the solar energy collector 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.

[0024] 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 water return pipe E3 is connected to the first water 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 for heating alone, or the solar thermal unit E1 heating can be combined with the air source heat pump heating condition, or the solar thermal unit E1 heating can be combined with the medium and deep ground source heat pump heating condition, so as to reduce the energy consumption of the heat pump unit C in the heating season, save energy and reduce emissions, see for details Figure 6 Of course, in actual projects, the two pipelines of the solar thermal collector unit E1 can also 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. It can work alone in winter or be combined with mid-deep geothermal heating for heating.

[0025] The present invention couples solar energy, medium-deep geothermal 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 during 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 geothermal heat pump system has a cooling function.

[0026] Finally, it should be emphasized that the above is only 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 recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Therefore, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope 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 replenishment 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 water 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, the solar water supply pipe is provided with a fifth valve and connected to the ground source side water return pipe, and the solar water return pipe is provided with a sixth valve and connected to the ground source side water supply pipe; The heat pump unit comprises 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 water pipeline connected to the user end, and a user side water supply pipeline, the first water supply pipeline is provided with a third valve and connected to the user side water supply pipeline, the first return water pipeline is provided with a fourth valve and connected to the user side return water pipeline; The heat exchange unit comprises 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 water return pipeline; The evaporator outlet of the water source heat pump unit is connected to the secondary side water inlet of the second heat exchanger through the second pipeline I, and the secondary side 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 pipeline II; the secondary side water inlet of the first heat exchanger is connected to the third pipeline III, and the other end of the third pipeline III is divided into two paths, one of which is connected to the evaporator outlet of the dual-source heat pump unit, and the other is provided with a first valve and connected to the user-side water supply pipeline. The secondary side water outlet of the first heat exchanger is connected to the fourth pipeline IV, and the other end of the fourth pipeline IV is divided into two paths, one of which is connected to the evaporator water inlet of the dual-source heat pump unit, and the other is provided with a second valve and connected to the user-side water return pipeline; The primary water inlet, the primary water outlet, the secondary water inlet and the 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 arranged 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 there are 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 exhaust precipitators.

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, and 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. An operating method of the multi-source coupled mid-deep geothermal 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 operation 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; The heating working condition of the medium-deep geothermal heat pump is as follows: open the third valve, the fourth valve, the user-side circulation pump group, the ground source side circulation pump group, the valve at each port of the first heat exchanger and the valve at each port of the second heat exchanger, and 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 ground source side water supply pipeline, and flows back to the ground source side return water pipeline from the primary side water outlet of the second heat exchanger, forming a ground source side circulation loop; The evaporator of the dual-source heat pump unit forms a first heat exchange circulation loop through the third pipeline III, the third pipeline 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 pipeline I, the second pipeline 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 to form a heat pump heating circulation loop; The solar inter-seasonal heat storage 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 working condition is 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.

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