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

Abstract

The invention discloses an energy storage type solar energy and soil source composite heat pump system and an operation method, the system comprises a soil source unit, a constant pressure water supplementing unit, a solar heat collecting unit, an energy storage unit, a user unit and a heat pump unit, and the user unit comprises a user side, a first water supply pipeline, a first water return pipeline and a first circulating pump set; and the soil unit is provided with a plurality of buried pipes, and a second water supply pipeline, a second water return pipeline and a second circulating pump set which are communicated with the plurality of buried pipes. The system works in cooperation with a power grid, solar energy is mainly used for heating in winter, and energy consumption is reduced; when the solar energy cannot meet the heating requirement, the ground source heat pump is combined for joint heating, heat can be stored in the valley electricity period in the operation process, the stored heat is preferentially used for heating in the peak electricity period, and the heating energy consumption in winter is further reduced; cold is stored in the valley electricity period in summer, cold storage refrigeration is preferentially utilized in the peak electricity period, power grid fluctuation caused by building cooling and heating electricity utilization is reduced, energy consumption is reduced, and the energy-saving effect is remarkable.

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 developed from "thermal power" to renewable energy (such as photovoltaic power generation and wind power). However, photovoltaic power generation and wind power are subject to meteorological conditions and have large fluctuations, and a series of measures need to be taken to reduce the volatility of the power grid. As an electricity-consuming unit in the power grid, cooling and heating electricity for buildings is one of the main factors causing the volatility of building electricity consumption. The solar soil source heat pump system uses solar energy and geothermal energy to provide cooling and heating for buildings. Coordinating the cooling and heating electricity needs of buildings with the power grid is of great significance to reducing power grid fluctuations. Therefore, how the solar soil source heat pump system can coordinate with the power grid in terms of system form and operation method has become an urgent problem to be solved. 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: 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 replenishment unit, a solar energy heat 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 water return pipeline, wherein the first water supply pipeline or the first water return pipeline is provided with at least one group of first circulation pump groups; 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 water return pipeline is divided into two paths, wherein one path is provided with a third valve and connected to the water return port of the condenser, and the other path is provided with a second valve and connected to the water return port of the evaporator; The soil unit has a plurality of buried pipes and a second water supply pipeline and a second water return pipeline connected to the plurality of buried pipes, and a second circulation pump group is arranged on the second water supply pipeline or the second water return pipeline; the water supply end of the second water supply pipeline 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 pipeline 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 comprises at least one energy storage water tank and a third water supply pipeline and a third water return pipeline connected to the energy storage water tank, and a third circulation pump group is arranged on the third water supply pipeline or the third water return 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 collector 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 water return pipeline; the third water return pipeline has two third water return branches, one of which is connected to the water return port of the solar thermal collector unit; the other third water return 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 water return pipeline; The first water supply pipeline and the second water supply pipeline are both provided with full-course water processors.

[0005] The beneficial effects are as follows: 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; 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 a thermal balance of the soil on an annual cycle; the present invention can work in coordination with the power grid, mainly using solar energy for direct heating in winter to reduce energy consumption; when solar energy cannot meet the heating needs, it can be combined with soil sources and heat pump units for heating, and during operation, heat can be stored during valley power periods, and heat storage can be used for heating in peak power periods, further reducing winter heating energy consumption. Similarly, storing cold during valley power periods in summer and using cold storage for cooling in peak power periods can effectively reduce energy consumption, reduce power grid fluctuations caused by building cooling and heating electricity consumption, reduce energy consumption, and have significant energy-saving effects.

[0006] More preferably, the heat pump unit is at least two groups; the first circulating pump group is arranged on the first water supply pipeline close to the user side, and the first circulating pump group is at least two groups; the second circulating pump group is arranged on the second water supply pipeline close to the buried pipe, and the second circulating pump group is at least two groups; the third circulating pump group is arranged on the third water supply pipeline close to the energy storage water tank, and the third circulating pump group is at least two groups. The beneficial effect is that each circulating pump group of the present invention is at least two groups, which can be one for use and one for backup, or two for use and one for backup, so that the normal operation of the system can be guaranteed even if a fault occurs during operation.

[0007] 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 respectively connected to the first water supply pipeline and the second water supply pipeline. 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.

[0008] The present invention also proposes an operation method of an energy storage type solar energy and soil source composite heat pump system, the operation method having a soil source heat pump cooling condition, a soil source heat pump short-time cold storage condition, an energy storage water tank cooling condition, a solar energy heating condition, a soil source heat pump heating condition, a soil source heat pump short-time heat storage, an energy storage water tank heating condition and a solar energy cross-season heat storage condition; The cooling operation condition of the soil source heat pump is: open the first valve, the second valve, the seventh valve, the eighth valve, the first circulation pump group and the second circulation pump group, form a soil source cooling circulation loop between the buried pipe and the condenser, and form a cooling circulation loop between the evaporator and the user end to provide cooling for the user; The short-term cold storage working condition of the soil source heat pump is: 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 to form a soil source cooling circulation loop, and the evaporator and the energy storage water tank are interconnected to form a cold storage circulation loop; Energy storage water tank cooling condition: open the first electric valve and the fourth electric valve, open the first circulation pump group and the third circulation pump group, so that the energy storage water tank and the user end are connected to each other 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, 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; Soil 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 soil source heating circulation loop, and the condenser and the user end are interconnected to form a heating circulation loop; Soil source heat pump heat storage working condition: open the fifth valve, the sixth valve, the third valve, the fourth valve, the second electric valve, the third electric valve and the second circulation pump group, and ensure that the first circulation pump group is in the closed state. The buried pipe and the evaporator are interconnected to form a soil source heating circulation loop, and the condenser and the energy storage water tank are interconnected to form a heat storage circulation loop; Energy storage water tank heating 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.

[0009] Preferably, the water outlet of the second water supply pipeline also has a first heat storage branch connected to the water inlet of the solar thermal collector unit, and the first heat storage branch has a ninth valve; The water inlet end of the second water return pipeline also has a second heat storage branch connected to the water outlet of the solar thermal collection unit, and the second heat storage branch is provided with a tenth valve; Under the solar inter-seasonal heat storage 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 then circulates into the solar thermal collection unit after heat exchange, exchanging heat to the soil, thereby ensuring the annual total balance of the soil source as much as possible.

[0010] Compared with the prior art, 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; 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 thermal balance of the soil on an annual cycle; the present invention can work in coordination with the power grid, mainly using solar energy for direct heating in winter to reduce energy consumption; when solar energy cannot meet the heating needs, it can be combined with soil sources and heat pump units for heating, and during operation, heat can be stored during the off-peak hours, and heat storage can be used for heating in the peak hours, further reducing winter heating energy consumption. Similarly, storing cold during the off-peak hours in summer and using cold storage for cooling during the peak hours can effectively reduce energy consumption, reduce power grid fluctuations caused by building cooling and heating electricity, reduce energy consumption, and have significant energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the present invention.

[0012] Figure 2 It is a schematic diagram of the cooling condition of the soil source heat pump unit of the present invention (indicated by the thick solid line).

[0013] Figure 3 It is a 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).

[0014] Figure 4 It is a schematic diagram of the cooling working condition of the energy storage water tank of the present invention (indicated by the thick solid line).

[0015] Figure 5 It is a schematic diagram of the heating condition of the solar thermal collection unit of the present invention (indicated by the thick solid line).

[0016] Figure 6 It is a schematic diagram of the heating condition of the soil source heat pump unit of the present invention (indicated by the thick solid line).

[0017] Figure 7 It is a 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).

[0018] Figure 8 It is a schematic diagram of the heating working condition of the energy storage water tank of the present invention (indicated by the thick solid line).

[0019] Fig. 9It is a schematic diagram of the cross-season heat storage working condition of the solar thermal collection unit of the present invention (indicated by the thick solid line).

[0020] Fig.10 It is a schematic diagram of cooling and short-term cold storage of the soil source heat pump unit of the present invention (indicated by the thick solid line).

[0021] Fig.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).

[0022] Fig.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

[0023] 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.

[0024] 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.

[0025] 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 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.

[0026] like Figure 1As shown, the energy storage type solar energy and soil source composite heat pump system of the present invention comprises a soil source unit B, a constant pressure water replenishment unit E, a solar energy heat collection unit D, an energy storage unit F, a user unit C and two groups of heat pump units A; the user unit C comprises 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 arranged on the first water supply pipeline C1 near the user end; the soil source unit B has multiple buried pipes B1 and a second water supply pipeline B2 and a second water return pipeline B3 connected to the multiple buried pipes B1. The second water return pipeline B3 is provided with three parallel second circulation pump groups P2 (two for use and one for backup); the energy storage unit F includes two energy storage tanks F1 and a third water supply pipeline F2 and a third water return pipeline F3 connected to the energy storage tank F1. The third water return pipeline F3 is provided with two parallel third circulation pump groups P3 (one for use and one for backup); each circulation pump group has a backup group to ensure the normal operation of the system as much as possible; The solar thermal collector unit D, the heat pump unit A and the 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 the 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: The water inlet end of the first water supply pipeline C1 is divided into two paths, 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 end of the first return water pipeline C2 is divided into two paths, namely a third branch and a fourth branch, the third branch of which is provided with a third valve V3 and connected to the water return port of the condenser, and the fourth branch of which is provided with a second valve V2 and connected to the water return port 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 pipeline C2 and the fourth branch, and the cold water is supplied to the user end from the water outlet of the evaporator through the first water supply pipeline C1 to meet the cooling demand of the user end; when heating is needed, 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 pipeline C2 and the third branch, and 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 pipeline C1 to achieve heating; The buried pipe B1 is connected to the heat pump unit A through the second water supply pipe B2 and the second water return pipe B3 to provide cooling (in summer) or heat (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, i.e., 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 water return pipe B3 (i.e., the end close to the heat pump unit A) has two water return branches, i.e., 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 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 flows back to the buried pipe B1 through the eighth branch and the second return water pipeline B3, and so on, to provide cooling for the heat pump unit A; in winter, the fifth valve V5 and the sixth valve V6 are opened, 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 flows back to the buried pipe B1 again through the water outlet of the evaporator, and so on, to provide heat for the heat pump unit A; The energy storage water tank F1 is connected with the solar thermal collector unit D, the heat pump unit A and the user end, and can realize cold storage, heat storage and 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 provided with a fifth electric valve D5) is connected to the water outlet of the solar thermal collector unit D; the water inlet end of the other third water supply branch is divided into two paths, one of which is provided with a first electric valve D1 and connected to the first return water pipeline C2, and the other is provided 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 provided with a sixth electric valve D6 and connected to the return water port of the solar thermal collector unit D; the other third return water branch is divided into two paths, one of which is provided with a third electric valve D3 and connected to the first return water pipeline C2, and the other is provided with a fourth electric valve D4 and connected to the first return water pipeline C2; ​​the first return water pipeline C2 and the second water supply pipeline B2 are both provided with full-process water treatment devices to ensure water quality and reduce the impact on pipelines and equipment.

[0027] During actual installation, the water outlet end of the second water supply pipeline 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 pipeline 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 utilizing solar energy to store heat across seasons.

[0028] Combination 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 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 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 to ensure that the water pressure during system operation is within a normal range, thereby ensuring the stable operation of the system; 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 cold storage for cooling or heat storage 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.

[0029] 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, and heat can be stored during off-peak hours, and the stored heat can be used for heating during peak hours, further reducing the energy consumption for heating in winter. 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 building cooling and heating, reducing energy consumption, and achieving significant energy-saving effects.

[0030] 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 condition, a soil source heat pump short-time cold storage condition, an energy storage water tank cooling condition, a solar energy heating condition, a soil source heat pump heating condition, a soil source heat pump short-time heat storage, an energy storage water tank heating condition and a solar energy cross-season heat storage condition, wherein the operating conditions of each condition are as follows: Ground source heat pump cooling condition (summer): open the first valve V1, the second valve V2, the seventh valve V7, the eighth valve V8, the first circulation pump group P1 and the second circulation pump group P2, and close the third valve V3, the fourth valve V4, the fifth valve V5, the sixth valve V6, the first electric valve D1, the second electric valve D2, the third electric valve D3 and the fourth electric valve D4, the fifth electric valve D5, the sixth electric valve D6, the seventh electric valve D7 and the 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 pipeline B2. The cooling water circulation entering the condenser takes away the heat generated by the work of the compressor in the heat pump unit A and the heat of the room; a cooling circulation loop is formed between the evaporator and the user end. The cold water circulation entering the user takes away the heat of the room and provides cooling for the user (connected to the air conditioner terminal). For details, see Figure 2 .

[0031] In summer, staggered cold storage can be used, and the soil source heat pump unit A can be used to store cold during the off-peak period at night (i.e., start the soil source heat pump short-term cold storage condition), 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, the buried pipe B1 and the condenser are circulated to form a soil source cooling circulation loop, the evaporator and the energy storage water tank F1 are interconnected to form a cold storage circulation loop, the energy storage water tank F1 enters from the bottom and exits from the top, and the circulating water circulates in and out of the evaporator and the energy storage water tank F1, thereby realizing short-term cold storage, see details. Figure 3 .

[0032] 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. Fig.10 .

[0033] 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, 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, provides cooling capacity for the user (air conditioning system), and realizes the peak electricity utilization of cold storage, see details Figure 4 .

[0034] In winter, solar energy can be used for direct heating (solar energy heating condition): 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 the other circulation pump groups and valves are all in the closed state. The solar energy collection unit D and the user end (such as the air conditioning system) form a solar energy circulation heating loop. The hot water of the solar energy collection unit D is directly supplied to the user end, and the return water enters the solar energy collection unit D again. This cycle is repeated to provide heating for the user. For details, see Figure 5 .

[0035] In clear weather, if there is excess heat in the solar thermal 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 unit D, and the sixth electric valve D6 at the water outlet of the solar thermal unit D. The hot water of the solar thermal 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 unit D. The cycle continues in this way, and the water in the energy storage tank F1 is heated to the set temperature to achieve solar thermal storage. Of course, in actual work, the solar thermal unit D is used for heating and heat storage, see Fig.12 .

[0036] In winter, the heat from the soil source makes the water temperature much higher than the external environment temperature. When the heat provided by the solar thermal collector unit D is not enough 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 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, there is heat exchange between the evaporator and the condenser, and the condenser and the user end form a heating circulation loop, the soil source heat is indirectly transferred to the circulating water between the condenser and the user end, and heat is provided to the user end. For details, see Figure 6 .

[0037] During the off-peak hours in winter, the energy storage tank F1 can be used for short-term heat storage. Under the soil source short-term heat storage 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 other valves and circulation pump groups, 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 heating while storing heat. For details, see Fig.11 .

[0038] During the peak electricity period in winter, the energy storage tank F1 is used for heating first (i.e., the energy storage tank heating condition): 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, 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, and the cycle continues until the water temperature in the energy storage tank F1 is lower than the set value, then start the solar heating or the ground source heat pump unit A for heating, see for details Figure 8 .

[0039] In spring or autumn, solar energy is used to store heat in the soil source across seasons: 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 are opened, and other valves and circulation pump groups are closed. A heat storage circulation loop is formed between the solar thermal collection unit D and the buried pipe B1. The hot water of the solar thermal collection unit D enters the buried pipe B1 and is circulated into the solar thermal collection unit D after heat exchange. The heat is exchanged to the soil, which can balance the geothermal energy and ensure the annual total balance of soil source heat as much as possible. For details, see Fig. 9 .

[0040] 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. An energy storage type solar energy and soil source composite heat pump system, characterized in that: It includes a soil source unit, a constant pressure water replenishment 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 water return pipeline, wherein the first water supply pipeline or the first water return pipeline is provided with at least one group of first circulation pump groups; 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 water return pipeline is divided into two paths, wherein one path is provided with a third valve and connected to the water return port of the condenser, and the other path is provided with a second valve and connected to the water return port of the evaporator; The soil unit has a plurality of buried pipes and a second water supply pipeline and a second water return pipeline connected to the plurality of buried pipes, and a second circulation pump group is arranged on the second water supply pipeline or the second water return pipeline; the water supply end of the second water supply pipeline 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 pipeline 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 comprises at least one energy storage water tank and a third water supply pipeline and a third water return pipeline connected to the energy storage water tank, and a third circulation pump group is arranged on the third water supply pipeline or the third water return 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 collector 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 water return pipeline; the third water return pipeline has two third water return branches, one of which is connected to the water return port of the solar thermal collector unit; the other third water return 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 water return pipeline; The first water supply pipeline and the second water supply pipeline are both provided with full-course 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 unit is arranged on the first water supply pipeline close to the user side, and there are at least two first circulating pump units; the second circulating pump unit is arranged on the second water supply pipeline close to the buried pipe, and there are at least two second circulating pump units; the third circulating pump unit is arranged on the third water supply pipeline close to the energy storage water tank, and there are at least two third circulating pump units.

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 comprises 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. An operating method of 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 condition, a soil source heat pump short-time cold storage condition, an energy storage tank cooling condition, a solar heating condition, a soil source heat pump heating condition, a soil source heat pump short-time heat storage condition, an energy storage tank heating condition, and a solar cross-season heat storage condition; The cooling operation condition of the soil source heat pump is: open the first valve, the second valve, the seventh valve, the eighth valve, the first circulation pump group and the second circulation pump group, form a soil source cooling circulation loop between the buried pipe and the condenser, and form a cooling circulation loop between the evaporator and the user end to provide cooling for the user; The short-term cold storage working condition of the soil source heat pump is: 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 to form a soil source cooling circulation loop, and the evaporator and the energy storage water tank are interconnected to form a cold storage circulation loop; Energy storage water tank cooling condition: open the first electric valve and the fourth electric valve, open the first circulation pump group and the third circulation pump group, so that the energy storage water tank and the user end are connected to each other 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, 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; Soil 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 soil source heating circulation loop, and the condenser and the user end are interconnected to form a heating circulation loop; Soil source heat pump heat storage working condition: open the fifth valve, the sixth valve, the third valve, the fourth valve, the second electric valve, the third electric valve and the second circulation pump group, and ensure that the first circulation pump group is in the closed state. The buried pipe and the evaporator are interconnected to form a soil source heating circulation loop, and the condenser and the energy storage water tank form a heat storage circulation loop; Energy storage water tank heating 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 operating method of the energy storage type solar energy and soil source composite heat pump system according to claim 1 is characterized in that: The water outlet of the second water supply pipeline also has a first heat storage branch connected to the water inlet of the solar thermal collector unit, and the first heat storage branch has a ninth valve; The water inlet end of the second water return pipeline also has a second heat storage branch connected to the water outlet of the solar thermal collection unit, and the second heat storage branch is provided with a tenth valve; The solar energy inter-seasonal heat storage working condition: open the fifth electric valve, the sixth electric valve, the ninth valve, the tenth valve and the second circulation pump group, form a heat storage circulation loop between the solar energy collection unit and the buried pipe, and the hot water of the solar energy collection unit enters the buried pipe and recirculates into the solar energy collection unit after heat exchange.

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