Energy storage type solar energy and soil source composite heat pump system and operation method

Abstract

The present invention discloses an energy storage type solar energy and soil source composite heat pump system and its operation method. The system includes a soil source unit, a constant pressure water supply unit, a solar heat collection unit, an energy storage unit, a user unit and a heat pump unit. The user unit includes a user end, a first water supply pipeline, a first return pipeline and a first circulation pump group. The soil unit has multiple buried pipes and a second water supply pipeline, a second return pipeline and a second circulation pump group connected to the multiple buried pipes. The present invention works in coordination with the power grid. In winter, it mainly uses solar energy for heating to reduce energy consumption. When solar energy cannot meet the heating demand, it combines with the soil source heat pump for heating. During operation, it can store heat during off-peak hours and give priority to using the stored heat for heating during peak hours, further reducing winter heating energy consumption. In summer, it stores cold during off-peak hours and gives priority to using the stored cold for cooling during peak hours. This reduces the power grid fluctuations caused by the electricity consumption of building cooling and heating, reduces energy consumption, and has a significant energy-saving effect.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and in particular to an energy storage type solar energy and soil source composite heat pump system and an operation method thereof. Background Art

[0002] In recent years, my country's power system has gradually shifted from thermal power to renewable energy sources such as photovoltaic and wind power. However, photovoltaic and wind power generation are subject to meteorological constraints and exhibit significant volatility, necessitating a series of measures to mitigate grid volatility. As a power-consuming unit in the grid, cooling and heating electricity consumption for buildings is a major factor contributing to fluctuations in building electricity consumption. Solar ground-source heat pump systems utilize renewable energy sources such as solar energy and geothermal energy to provide cooling and heating to buildings. Coordinating building cooling and heating electricity consumption with the grid plays a crucial role in mitigating grid fluctuations. Therefore, how to coordinate solar ground-source heat pump systems with the grid in terms of system form and operation methods has become a pressing issue. Summary of the Invention

[0003] In view of this, the present invention proposes an energy storage type solar energy and soil source composite heat pump system, and also proposes an operation method of the energy storage type solar energy and soil source composite heat pump system.

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

[0005] The energy storage type solar energy and soil source composite heat pump system of the present invention comprises a soil source unit, a constant pressure water supply unit, a solar thermal collection unit, an energy storage unit, a user unit and a heat pump unit, wherein the heat pump unit comprises an evaporator and a condenser, and the user unit comprises a user end, a first water supply pipeline and a first return pipeline, wherein at least one group of first circulation pump groups is provided on the first water supply pipeline or the first return pipeline; wherein the water inlet end of the first water supply pipeline is divided into two paths, wherein one path is provided with a fourth valve and connected to the water outlet of the condenser, and the other path is provided with a first valve and connected to the water outlet of the evaporator; the water outlet end of the first return pipeline is divided into two paths, wherein one path is provided with a third valve and connected to the water return outlet of the condenser, and the other path is provided with a second valve and connected to the water return outlet of the evaporator;

[0006] The soil unit has a plurality of buried pipes and a second water supply pipe and a second water return pipe connected to the plurality of buried pipes, and a second circulation pump group is provided on the second water supply pipe or the second water return pipe; the water supply end of the second water supply pipe has two branches, one of which is provided with a seventh valve and connected to the water inlet of the condenser, and the other branch is provided with a sixth valve and connected to the inlet of the evaporator; the inlet end of the second water return pipe has two branches, one of which is provided with an eighth valve and connected to the water outlet of the condenser, and the other branch is provided with a fifth valve and connected to the water outlet of the evaporator;

[0007] The energy storage unit includes at least one energy storage water tank and a third water supply pipeline and a third return water pipeline connected to the energy storage water tank, and a third circulation pump group is provided on the third water supply pipeline or the third return water pipeline; wherein, the inlet of the third water supply pipeline has two primary branches, one of which is connected to the water outlet of the solar thermal collection unit, and the other primary branch is divided into two paths, one of which is provided with a second electric valve and connected to the first water supply pipeline, and the other is provided with a first electric valve and connected to the first return water pipeline; the third return water pipeline has two third return water branches, one of which is connected to the return water outlet of the solar thermal collection unit; the other third return water branch is divided into two paths, one of which is provided with a fourth electric valve and connected to the first water supply pipeline, and the other is provided with a third electric valve and connected to the first return water pipeline;

[0008] The first water supply pipeline and the second water supply pipeline are both provided with full-process water processors.

[0009] The beneficial effects are as follows: the present invention combines soil sources, solar energy, and heat pump units to meet heating needs in winter and cooling needs in summer; it absorbs heat from the soil source in winter and replaces it with the soil source in summer, and combines cross-seasonal energy storage to maintain a thermal balance in the soil on an annual cycle; the present invention can work in conjunction with the power grid, mainly using solar energy for direct heating in winter to reduce energy consumption; when solar energy cannot meet the heating demand, it can be combined with soil sources and heat pump units for joint heating. During operation, heat can be stored during off-peak hours, and heat storage can be used for heating during peak hours, further reducing winter heating energy consumption. Similarly, storing cold during off-peak hours in summer and using cold storage for cooling during peak hours can effectively reduce energy consumption, reduce power grid fluctuations caused by building cooling and heating electricity consumption, reduce energy consumption, and achieve significant energy-saving effects.

[0010] More preferably, the heat pump units are at least two; the first circulating pump unit is installed on the first water supply pipeline near the user side, and the first circulating pump unit is at least two; the second circulating pump unit is installed on the second water supply pipeline near the buried pipe, and the second circulating pump unit is at least two; the third circulating pump unit is installed on the third water supply pipeline near the energy storage water tank, and the third circulating pump unit is at least two. The beneficial effect is that each circulating pump unit of the present invention has at least two groups, which can be one in use and one in reserve, or two in use and one in reserve, so that even if a fault occurs during operation, the normal operation of the system can be guaranteed.

[0011] Preferably, the constant pressure water replenishment unit includes a softening water device and at least one constant pressure water replenishment device connected to the softening water device, and the constant pressure water replenishment device is connected to the first water supply pipeline and the second water supply pipeline respectively. During the operation of the system, constant pressure compensation can be performed on the operating module to ensure the normal operation of the operating module.

[0012] The present invention also proposes an operating method for an energy storage type solar energy and soil source composite heat pump system, the operating method having a soil source heat pump cooling mode, a soil source heat pump short-time cold storage mode, an energy storage water tank cooling mode, a solar energy heating mode, a soil source heat pump heating mode, a soil source heat pump short-time heat storage mode, an energy storage water tank heating mode, and a solar energy cross-seasonal heat storage mode;

[0013] The ground source heat pump cooling operation mode is as follows: the first valve, the second valve, the seventh valve, the eighth valve, the first circulation pump group and the second circulation pump group are opened, a ground source cooling circulation loop is formed between the buried pipe and the condenser, and a cooling circulation loop is formed between the evaporator and the user end to provide cooling for the user;

[0014] The short-term cold storage operating condition of the ground source heat pump is as follows: open the first valve, the second valve, the seventh valve, the eighth valve, the second electric valve, the third electric valve, the second circulation pump group and the third circulation pump group, close the first circulation pump group, the buried pipe and the condenser are circulated and connected to form a soil source cooling circulation loop, and the evaporator and the energy storage water tank are connected to each other to form a cold storage circulation loop;

[0015] Energy storage water tank cooling operation: Open the first and fourth electric valves, and turn on the first and third circulation pump groups to connect the energy storage water tank and the user end to form a cold storage and cooling circulation loop to provide cooling for the user;

[0016] Solar heating working condition: open the second electric valve, the third electric valve, the fifth electric valve and the sixth electric valve, and the first circulation pump group, the solar heat collection unit and the user end form a solar circulation heating loop to provide heating for the user;

[0017] Ground source heat pump heating condition: open the fifth valve, the sixth valve, the third valve, the fourth valve, the first circulation pump group and the second circulation pump group, the buried pipe and the evaporator are interconnected to form a ground source heating circulation loop, and the condenser and the user end are interconnected to form a heating circulation loop;

[0018] Ground source heat pump heat storage working condition: open the fifth valve, sixth valve, third valve, fourth valve, second electric valve, third electric valve and second circulation pump group, and ensure that the first circulation pump group is in the closed state. The buried pipe and evaporator are interconnected to form a soil source heating circulation loop, and the condenser and energy storage water tank are interconnected to form a heat storage circulation loop;

[0019] Energy storage water tank heating working condition: open the first electric valve, the fourth electric valve and the first circulation pump group to form a heat storage heating circulation loop between the energy storage water tank and the user end.

[0020] Preferably, the water outlet of the second water supply pipeline further comprises a first heat storage branch connected to the water inlet of the solar heat collection unit, and the first heat storage branch comprises a ninth valve;

[0021] The water inlet end of the second water return pipe further has a second heat storage branch connected to the water outlet of the solar heat collection unit, and the second heat storage branch is provided with a tenth valve;

[0022] Under the solar inter-seasonal heat storage working condition, the fifth electric valve, the sixth electric valve, the ninth valve, the tenth valve and the second circulation pump group are opened, and a heat storage circulation loop is formed between the solar thermal collection unit and the buried pipe. The hot water of the solar thermal collection unit enters the buried pipe, and after heat exchange, it circulates into the solar thermal collection unit, exchanges heat to the soil, and ensures the annual total balance of the soil source as much as possible.

[0023] Compared with the existing technology, the present invention combines soil sources, solar energy and heat pump units to meet the heating needs in winter and the cooling needs in summer; it absorbs heat from the soil source in winter and replaces the heat into the soil source in summer, and combines cross-seasonal energy storage to maintain the soil in a thermal balance with an annual cycle; the present invention can work in conjunction with the power grid, mainly using solar energy for direct heating in winter to reduce energy consumption; when solar energy cannot meet the heating demand, it can combine soil sources and heat pump units for joint heating. During operation, heat can be stored during off-peak hours, and heat storage can be used for heating during peak hours, further reducing winter heating energy consumption. Similarly, cold storage during off-peak hours in summer and cold storage for cooling during peak hours can effectively reduce energy consumption, reduce power grid fluctuations caused by building cooling and heating electricity consumption, reduce energy consumption, and achieve significant energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the present invention.

[0025] Figure 2 Schematic diagram of the cooling operation of the ground source heat pump unit of the present invention (indicated by the thick solid line).

[0026] Figure 3 Schematic diagram of the short-term cold storage working condition of the soil source heat pump unit of the present invention (indicated by the thick solid line).

[0027] Figure 4 Schematic diagram of the cooling operation of the energy storage water tank of the present invention (indicated by the thick solid line).

[0028] Figure 5 Schematic diagram of the heating condition of the solar thermal collection unit of the present invention (indicated by the thick solid line).

[0029] Figure 6 Schematic diagram of the heating condition of the soil source heat pump unit of the present invention (indicated by the thick solid line).

[0030] Figure 7 Schematic diagram of the short-term heat storage working condition of the soil source heat pump unit of the present invention (indicated by the thick solid line).

[0031] Figure 8 Schematic diagram of the heating working condition of the energy storage water tank of the present invention (indicated by the thick solid line).

[0032] Figure 9 Schematic diagram of the inter-seasonal heat storage working condition of the solar thermal collection unit of the present invention (indicated by the thick solid line).

[0033] Figure 10 It is a schematic diagram of the cooling and short-term cold storage of the ground source heat pump unit of the present invention (indicated by the thick solid line).

[0034] Figure 11 It is a schematic diagram of the heating and short-term heat storage of the soil source heat pump unit of the present invention (indicated by the thick solid line).

[0035] Figure 12 It is a schematic diagram of direct heating and short-term heat storage of the solar thermal collection unit of the present invention (indicated by the thick solid line). DETAILED DESCRIPTION

[0036] 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.

[0037] It should be noted that, in the description of the present invention, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0038] In the description of the present invention, unless otherwise specified or limited, the terms "connected" and "connection" that may appear should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0039] like Figure 1As shown, the energy storage type solar energy and soil source composite heat pump system of the present invention includes a soil source unit B, a constant pressure water supply unit E, a solar heat collection unit D, an energy storage unit F, a user unit C and two heat pump units A; the user unit C includes a user end, a first water supply pipeline C1 and a first return water pipeline C2 (the first water supply pipeline C1 and the first return water pipeline C2 are preferably connected to the air conditioner at the user end), and three parallel first circulation pump groups P1 (two for use and one for backup) are provided on the first water supply pipeline C1 near the user end; the soil source unit System B has multiple underground pipes B1 and a second water supply pipe B2 and a second water return pipe B3 connected to the multiple underground pipes B1. The second water return pipe B3 is equipped with three parallel second circulation pump groups P2 (two in use and one in reserve). The energy storage unit F includes two energy storage tanks F1 and a third water supply pipe F2 and a third water return pipe F3 connected to the energy storage tanks F1. The third water return pipe F3 is equipped with two parallel third circulation pump groups P3 (one in use and one in reserve). Each circulation pump group has a backup group to ensure the normal operation of the system as much as possible.

[0040] The solar thermal collector unit D, heat pump unit A, and energy storage tank F1 are all connected to the user unit C to form a circulation loop, thereby realizing heating and cooling in various energy forms to meet the needs of the user end in different seasons; the energy storage tank F1 is connected to the solar thermal collector unit D and heat pump unit A to store heat and cold, and the energy storage tank F1 is connected to the user unit C to supply the stored heat and cold to the user end. The connection relationship is as follows:

[0041] The water inlet of the first water supply pipe C1 is divided into two branches, the first branch of which is provided with a fourth valve V4 and connected to the water outlet of the condenser, and the second branch of which is provided with a first valve V1 and connected to the water outlet of the evaporator; the water outlet of the first return pipe C2 is divided into two branches, namely the third branch and the fourth branch, the third branch of which is provided with a third valve V3 and connected to the return water outlet of the condenser, and the fourth branch of which is provided with a second valve V2 and connected to the return water outlet of the evaporator; when cooling is required, the first valve V1 and the second valve V2 are opened and the third valve V3 is closed. 3. The fourth valve V4: The return water from the user end enters the evaporator through the first return water pipe C2 and the fourth branch. Cold water is supplied to the user end from the water outlet of the evaporator through the first water supply pipe C1 to meet the user end's cooling needs. When heating is required, the third valve V3 and the fourth valve V4 are opened and the first valve V1 and the second valve V2 are closed. The hot return water from the user end enters the condenser through the first return water pipe C2 and the third branch. The hot water after heat exchange is supplied to the user end from the water outlet of the condenser through the first branch and the first water supply pipe C1 to achieve heating.

[0042] The buried pipe B1 is connected to the heat pump unit A through the second water supply pipe B2 and the second return pipe B3, providing cooling (in summer) or heating (in winter) for the heat pump unit A: the water supply end of the second water supply pipe B2 (i.e., the end close to the heat pump unit A) has two water supply branches, namely the seventh branch and the sixth branch. The seventh branch is provided with a seventh valve V7 and is connected to the water inlet of the condenser, and the sixth branch is provided with a sixth valve V6 and is connected to the water inlet of the evaporator; the inlet end of the second return pipe B3 (i.e., the end close to the heat pump unit A) has two return branches, namely the eighth branch and the fifth branch. The eighth branch is provided with an eighth valve V8 and is connected to the water outlet of the condenser, and the fifth branch is provided with a fifth valve V 5 and is connected to the water outlet of the evaporator; in summer, the seventh valve V7 and the eighth valve V8 are opened and the fifth valve V5 and the sixth valve V6 are closed. The soil source side provides cold water with a temperature lower than the ambient temperature. The cold water enters the condenser through the second water supply loop, absorbs the heat of the evaporator through the condenser, and then returns to the buried pipe B1 through the eighth branch and the second return water pipe B3. This cycle is repeated to provide cooling for the heat pump unit A; in winter, the fifth valve V5 and the sixth valve V6 are opened, and the seventh valve V7 and the eighth valve V8 are closed. The soil source provides low-temperature hot water with a temperature higher than the ambient temperature. The low-temperature hot water enters the evaporator and then returns to the buried pipe B1 through the water outlet of the evaporator. This cycle is repeated to provide heat for the heat pump unit A;

[0043] The energy storage tank F1 is connected to the solar thermal collection unit D, the heat pump unit A and the user end, which can realize the storage of cold and heat and the release of cold and heat. The inlet of the third water supply pipeline F2 has two third water supply branches, one of which (the branch is equipped with a fifth electric valve D5) is connected to the water outlet of the solar thermal collection unit D; the water inlet end of the other third water supply branch is divided into two paths, one of which is equipped with a first electric valve D1 and connected to the first return water pipeline C2, and the other is equipped with a second electric valve D2 and connected to the first water supply pipeline C1; the third return water pipeline F3 has two third return water branches, one of which is equipped with a sixth electric valve D6 and connected to the return water outlet of the solar thermal collection unit D; the other third return water branch is divided into two paths, one of which is equipped with a third electric valve D3 and connected to the first return water pipeline C2, and the other is equipped with a fourth electric valve D4 and connected to the first return water pipeline C2; ​​both the first return water pipeline C2 and the second water supply pipeline B2 are equipped with full-process water processors to ensure water quality and reduce the impact on pipelines and equipment.

[0044] During actual installation, the water outlet end of the second water supply pipe B2 also has a first heat storage branch connected to the water inlet of the solar thermal collection unit D, and the first heat storage branch has a ninth valve V9; the water inlet end of the second return water pipe B3 also has a second heat storage branch connected to the water outlet of the solar thermal collection unit D, and the second heat storage branch is provided with a tenth valve V10; during actual operation, the ninth valve V9 and the tenth valve V10 are in a normally closed state, and are opened when using solar energy to store heat across seasons.

[0045] Combine Figure 1 It can be seen that the constant-pressure water replenishment unit E includes a softening water device E1 and a constant-pressure water replenishment device E2 connected to the two softening water devices E1. The softening water device E1 is used to soften the raw water, thereby reducing the hardness of the water, reducing scale, and protecting the equipment; the expansion pipe and pressure pipe of one constant-pressure water replenishment device E2 are both connected to the first water supply pipeline C1, and the expansion pipe and pressure pipe of the other constant-pressure water replenishment device E2 are both connected to the second water supply pipeline B2. The constant-pressure water replenishment device E2 of the present invention can replenish water at a constant pressure, ensuring that the water pressure during system operation is within the normal range, thereby ensuring the stable operation of the system;

[0046] In actual installation, a branch with a seventh electric valve D7 is connected in parallel between the two third circulation pump groups P3 (see Figure 1 ), when storing cold for cooling or storing heat for heating, this branch can be used for cooling or heating, reducing the number of working cycles of the circulating pump group, thereby reducing the working energy consumption of the circulating pump group.

[0047] The present invention combines soil sources, solar energy and heat pump unit A to meet the heating needs in winter and the cooling needs in summer. During operation, it can work in conjunction with the power grid, with solar energy being the main heating method in winter. When solar energy cannot meet the heating needs, the soil source heat pump unit A is used for heating. In addition, heat can be stored during off-peak hours, and the stored heat can be used for heating during peak hours, further reducing winter heating energy consumption. Similarly, cold can be stored during off-peak hours in summer, and cold storage can be used for cooling during peak hours, which can effectively reduce energy consumption, thereby reducing power grid fluctuations caused by electricity consumption for cooling and heating of buildings, reducing energy consumption, and achieving significant energy-saving effects.

[0048] The operating method of the energy storage type solar energy and soil source composite heat pump system of the present invention has a soil source heat pump cooling mode, a soil source heat pump short-term cold storage mode, an energy storage water tank cooling mode, a solar energy heating mode, a soil source heat pump heating mode, a soil source heat pump short-term heat storage mode, an energy storage water tank heating mode, and a solar energy cross-seasonal heat storage mode. The operating conditions of each mode are as follows:

[0049] Ground source heat pump cooling operation (summer): Open the first valve V1, second valve V2, seventh valve V7, eighth valve V8, first circulation pump group P1 and second circulation pump group P2; close the third valve V3, fourth valve V4, fifth valve V5, sixth valve V6, first electric valve D1, second electric valve D2, third electric valve D3, fourth electric valve D4, fifth electric valve D5, sixth electric valve D6, seventh electric valve D7 and third circulation pump group P3. A ground source cooling circulation loop is formed between the buried pipe B1 and the condenser. The cooling water in the buried pipe B1 enters the condenser through the second water supply pipe B2. The cooling water circulation in the condenser removes the heat generated by the work of the compressor in the heat pump unit A and the heat in the room. A cooling circulation loop is formed between the evaporator and the user end. The cold water circulation entering the user removes the heat in the room and provides cooling for the user (connected to the air conditioner terminal). For details, see Figure 2 .

[0050] In summer, staggered cold storage can be adopted, and the ground source heat pump unit A can be used to store cold during the off-peak period at night (i.e., start the ground source heat pump short-term cold storage condition). The details are as follows: when storing cold, open the first valve V1, the second valve V2, the seventh valve V7, the eighth valve V8, the second electric valve D2, the third electric valve D3, the second circulation pump group P2 and the third circulation pump group P3, close other valves and the first circulation pump group P1, and the buried pipe B1 and the condenser are connected to form a soil source cooling circulation loop. The evaporator and the energy storage tank F1 are connected to each other to form a cold storage circulation loop. The energy storage tank F1 enters from the bottom and exits from the top. The circulating water circulates in and out of the evaporator and the energy storage tank F1, thereby achieving short-term cold storage. For details, see Figure 3 .

[0051] During short-term cold storage, one heat pump unit A can be used, or two heat pump units A can be used to work at the same time. Of course, in actual operation, short-term cold storage and ground source heat pump unit cooling can also work at the same time. The difference between this working condition and the ground source heat pump cold storage working condition is that the first circulation pump unit P1 also needs to be turned on. The water outlet of the evaporator is divided into two routes, one enters the energy storage tank F1 through the third water supply pipeline F2, and the other is supplied to the user end; the water inlet of the evaporator has two routes, one is connected to the first return water pipeline C2 at the user end, and the other is connected to the third return water pipeline F3 of the energy storage tank F1, see details. Figure 10 .

[0052] During the peak electricity period in summer, the energy storage tank F1 can be used to directly provide cooling (i.e., the energy storage tank cooling condition): open the first electric valve D1, the fourth electric valve D4, the first circulation pump group P1, and the seventh electric valve D7, close all other valves, the second circulation pump group P2, and the third circulation pump group P3, and the energy storage tank F1 and the user end form a cold storage and cooling circulation loop. The first circulation pump group P1 provides power and provides cooling capacity for the user (air conditioning system), realizing the peak electricity utilization of cold storage. For details, see Figure 4 .

[0053] In winter, solar energy can be used for direct heating (solar heating mode): open the second electric valve D2, the third electric valve D3, the fifth electric valve D5, the sixth electric valve D6 and the first circulation pump group P1, and keep the other circulation pump groups and valves closed. The solar thermal unit D and the user end (such as the air conditioning system) form a solar circulation heating loop. The hot water from the solar thermal unit D is directly supplied to the user end, and the return water enters the solar thermal unit D again. This cycle continues to provide heating for the user. For details, see Figure 5 .

[0054] In clear weather, if there is excess heat in the solar thermal collection unit D, the excess heat can be stored in the energy storage tank F1. Specifically, open the third circulation pump group P3, the fifth electric valve D5 at the water inlet of the solar thermal collection unit D, and the sixth electric valve D6 at the water outlet of the solar thermal collection unit D. The hot water of the solar thermal collection unit D directly enters the energy storage tank F1, and the water in the upper part of the energy storage tank F1 enters the solar thermal collection unit D. In this way, the cycle will heat the water in the energy storage tank F1 to the set temperature, realizing solar thermal storage. Of course, in actual work, the solar thermal collection unit D is used for heating and heat storage, see Figure 12 .

[0055] In winter, the heat from the soil source makes the water temperature much higher than the external ambient temperature. When the heat provided by the solar thermal collector unit D is insufficient to meet the needs of the user end, the soil source heat pump unit A is used for heating. Under the soil source heat pump heating condition: open the fifth valve V5, the sixth valve V6 and the third valve V3, the fourth valve V4, the first circulation pump group P1 and the second circulation pump group P2, close the other valves and the third circulation pump group P3, the buried pipe B1 and the evaporator are interconnected to form a soil source heating circulation loop, the soil source heat is circulated and transferred to the evaporator in this way, heat exchange occurs between the evaporator and the condenser, and a heating circulation loop is formed between the condenser and the user end, indirectly transferring the soil source heat to the circulating water between the condenser and the user end, providing heat for the user end. For details, see Figure 6 .

[0056] During the off-peak hours in winter, the energy storage tank F1 can be used for short-term heat storage. In the soil source short-term heat storage operating condition, open the fifth valve V5, the sixth valve V6, the third valve V3, the fourth valve V4, the second circulation pump group P2, the third circulation pump group P3, the second electric valve D2 and the third electric valve D3, close the other valves and the circulation pump group, the buried pipe B1 and the evaporator are interconnected to form a soil source heating circulation loop, and the condenser and the energy storage tank F1 are interconnected to form a heat storage circulation loop to achieve heat storage. For details, see Figure 7 Of course, during the heat storage process, the first circulation pump group P1 can also be turned on to achieve heat storage and heating at the same time. Figure 11 .

[0057] During the peak electricity period in winter, the energy storage tank F1 is used for heating first (i.e., the energy storage tank heating mode): open the first electric valve D1, the fourth electric valve D4, the seventh electric valve D7, and the first circulation pump group P1, close all other valves and the second circulation pump group P2 and the third circulation pump group P3, and the energy storage tank F1 and the user end form a heat storage heating circulation loop. The return water from the user end enters the energy storage tank F1, and the hot water in the energy storage tank F1 is provided to the user end through the first water supply pipeline C1. This cycle continues until the water temperature in the energy storage tank F1 is lower than the set value, and then the solar heating or ground source heat pump unit A is started for heating. For details, see Figure 8 .

[0058] In spring or autumn, solar energy is used to store heat from the soil source across seasons: open the fifth electric valve D5, the sixth electric valve D6, the ninth valve V9, the tenth valve V10, and the second circulation pump group P2, and close the other valves and circulation pump groups. A heat storage circulation loop is formed between the solar thermal collection unit D and the buried pipe B1. The hot water from the solar thermal collection unit D enters the buried pipe B1, and after heat exchange, it is circulated back into the solar thermal collection unit D, exchanging heat with the soil. This can balance the geothermal energy and ensure the annual total balance of soil source heat as much as possible. For details, see Figure 9 .

[0059] 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. An energy storage type solar energy and soil source composite heat pump system, characterized by: It includes a soil source unit, a constant pressure water supply unit, a solar thermal collection unit, an energy storage unit, a user unit and a heat pump unit, wherein the heat pump unit has an evaporator and a condenser, and the user unit includes a user end, a first water supply pipeline and a first return pipeline, and at least one group of first circulation pump groups is provided on the first water supply pipeline or the first return pipeline; wherein the water inlet end of the first water supply pipeline is divided into two paths, one of which is provided with a fourth valve and connected to the water outlet of the condenser, and the other is provided with a first valve and connected to the water outlet of the evaporator; the water outlet end of the first return pipeline is divided into two paths, one of which is provided with a third valve and connected to the water return port of the condenser, and the other is provided with a second valve and connected to the water return port of the evaporator; The soil source unit has a plurality of buried pipes and a second water supply pipe and a second water return pipe connected to the plurality of buried pipes, and a second circulation pump group is provided on the second water supply pipe or the second water return pipe; the water supply end of the second water supply pipe has two branches, one of which is provided with a seventh valve and connected to the water inlet of the condenser, and the other branch is provided with a sixth valve and connected to the inlet of the evaporator; the inlet end of the second water return pipe has two branches, one of which is provided with an eighth valve and connected to the water outlet of the condenser, and the other branch is provided with a fifth valve and connected to the water outlet of the evaporator; The energy storage unit includes at least one energy storage water tank and a third water supply pipeline and a third return water pipeline connected to the energy storage water tank, and a third circulation pump group is provided on the third water supply pipeline or the third return water pipeline; wherein, the inlet of the third water supply pipeline has two primary branches, one of which is connected to the water outlet of the solar thermal collection unit, and the other primary branch is divided into two paths, one of which is provided with a second electric valve and connected to the first water supply pipeline, and the other is provided with a first electric valve and connected to the first return water pipeline; the third return water pipeline has two third return water branches, one of which is connected to the return water outlet of the solar thermal collection unit; the other third return water branch is divided into two paths, one of which is provided with a fourth electric valve and connected to the first water supply pipeline, and the other is provided with a third electric valve and connected to the first return water pipeline; The first water supply pipeline and the second water supply pipeline are both provided with full-process water processors.

2. The energy storage type solar energy and soil source composite heat pump system according to claim 1 is characterized in that: There are at least two heat pump units; the first circulating pump group is arranged on the first water supply pipeline close to the user side, and there are at least two first circulating pump groups; the second circulating pump group is arranged on the second water supply pipeline close to the buried pipe, and there are at least two second circulating pump groups; the third circulating pump group is arranged on the third water supply pipeline close to the energy storage water tank, and there are at least two third circulating pump groups.

3. The energy storage type solar energy and soil source composite heat pump system according to claim 1 is characterized in that: The constant-pressure water replenishment unit includes a softening water device and at least one constant-pressure water replenishment device connected to the softening water device, and the constant-pressure water replenishment device is connected to the first water supply pipeline and the second water supply pipeline respectively.

4. A method for operating the energy storage type solar energy and soil source composite heat pump system according to claim 1, characterized in that: The operation method includes a soil source heat pump cooling mode, a soil source heat pump short-time cold storage mode, an energy storage water tank cooling mode, a solar heating mode, a soil source heat pump heating mode, a soil source heat pump short-time heat storage mode, an energy storage water tank heating mode, and a solar cross-seasonal heat storage mode. The ground source heat pump cooling operation mode is as follows: the first valve, the second valve, the seventh valve, the eighth valve, the first circulation pump group and the second circulation pump group are opened, a ground source cooling circulation loop is formed between the buried pipe and the condenser, and a cooling circulation loop is formed between the evaporator and the user end to provide cooling for the user; The short-term cold storage operating condition of the ground source heat pump is as follows: open the first valve, the second valve, the seventh valve, the eighth valve, the second electric valve, the third electric valve, the second circulation pump group and the third circulation pump group, close the first circulation pump group, the buried pipe and the condenser are circulated and connected to form a soil source cooling circulation loop, and the evaporator and the energy storage water tank are connected to each other to form a cold storage circulation loop; Energy storage water tank cooling operation: Open the first and fourth electric valves, and turn on the first and third circulation pump groups to connect the energy storage water tank and the user end to form a cold storage and cooling circulation loop to provide cooling for the user; Solar heating working condition: open the second electric valve, the third electric valve, the fifth electric valve and the sixth electric valve, and the first circulation pump group, the solar heat collection unit and the user end form a solar circulation heating loop to provide heating for the user; Ground source heat pump heating condition: open the fifth valve, the sixth valve, the third valve, the fourth valve, the first circulation pump group and the second circulation pump group, the buried pipe and the evaporator are interconnected to form a ground source heating circulation loop, and the condenser and the user end are interconnected to form a heating circulation loop; Ground source heat pump heat storage working condition: open the fifth valve, sixth valve, third valve, fourth valve, second electric valve, third electric valve and second circulation pump group, and ensure that the first circulation pump group is in the closed state. The buried pipe and evaporator are interconnected to form a soil source heating circulation loop, and the condenser and energy storage water tank form a heat storage circulation loop; Energy storage water tank heating working condition: open the first electric valve, the fourth electric valve and the first circulation pump group to form a heat storage heating circulation loop between the energy storage water tank and the user end.

5. The method for operating the energy storage type solar energy and soil source composite heat pump system according to claim 4, characterized in that: The water outlet of the second water supply pipeline further has a first heat storage branch connected to the water inlet of the solar heat collection unit, and the first heat storage branch has a ninth valve; The water inlet end of the second water return pipe further has a second heat storage branch connected to the water outlet of the solar heat collection unit, and the second heat storage branch is provided with a tenth valve; The solar inter-seasonal heat storage working condition is as follows: the fifth electric valve, the sixth electric valve, the ninth valve, the tenth valve and the second circulation pump group are opened, a heat storage circulation loop is formed between the solar thermal collection unit and the buried pipe, hot water from the solar thermal collection unit enters the buried pipe, and is recirculated into the solar thermal collection unit after heat exchange.

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