Multi-energy coupling supply and storage system and method based on terrestrial heat and solar energy cross-season and cross-time heat storage

Abstract

The invention relates to the field of clean energy supply technology research, in particular to a multi-energy coupling supply and storage system and method based on terrestrial heat and solar energy cross-season and cross-time heat storage, and the system comprises a pipe network, a solar energy module, a terrestrial heat energy module, a user side and an air energy module. Compared with the system in the prior art, the system provided by the invention can integrate a plurality of renewable energy sources, complementarily utilize the renewable energy sources at different time and under different conditions, and improve the overall stability. Meanwhile, solar energy is utilized for heat storage in the non-energy-supply period and the energy-supply period and the non-energy-supply period, the problem of underground cold accumulation is solved, and energy supply and energy storage integration is achieved.

Description

Technical Field

[0001] The present invention belongs to the field of multi-energy coupling technology, and relates to the research field of underground energy storage and ground energy supply technology, specifically a multi-energy coupling storage system and method based on geothermal and solar energy cross-season and cross-time heat storage. Background Art

[0002] Single renewable energy sources such as solar energy, geothermal energy, and air energy are susceptible to environmental factors, resulting in volatility and indirectness, making them unable to achieve long-term, stable, and continuous energy supply. For example, solar energy may not generate sufficient energy for continuous supply on cloudy days or at night. Long-term operation of ground-source heat pump systems can lead to accumulation of hot and cold soil, reducing energy extraction efficiency. Air-source heat pump units can experience difficulty starting and stopping when operating at low temperatures.

[0003] With increasing demand for multi-energy complementarity, the energy system is undergoing a profound transformation from a single energy source to one that leverages multiple energy sources. Multi-energy coupling systems can achieve coordinated and mutually beneficial use of multiple energy sources by leveraging the mutual coupling and conversion characteristics between energy sources, thereby improving the overall efficiency of the energy system. However, existing technologies often focus on improving individual links, lacking overall optimization of the multi-energy coupling system. Furthermore, the separation of energy supply systems and energy storage devices leads to poor synergy and energy loss.

[0004] In order to solve the above problems such as large fluctuations in energy supply from single renewable energy sources such as solar energy, geothermal energy, and air energy, and overload of underground heat extraction in cold or extremely cold areas, the present invention proposes a multi-energy coupling supply and storage system and method based on geothermal and solar energy cross-season and cross-time heat storage. Summary of the Invention

[0005] Based on the problems existing in the prior art, the present invention proposes a multi-energy coupling supply and storage system and method based on geothermal and solar energy cross-season and cross-time heat storage.

[0006] The present invention provides a multi-energy coupling supply and storage system based on geothermal and solar energy cross-season and cross-time heat storage, comprising:

[0007] Pipeline network;

[0008] Solar modules for heat supply and heat storage, respectively connected to the water inlet and outlet of the pipe network;

[0009] A geothermal energy module connected to the water inlet and outlet of the solar module for performing a heating cycle and a cooling cycle for the user side;

[0010] A user side connected to the water inlet and outlet of the solar energy module and the geothermal energy module;

[0011] and an air energy module for heating cycle or cooling cycle, which is in communication with the water inlet and outlet on the user side.

[0012] Based on the above solution, the solar module includes:

[0013] solar thermal collectors for collecting solar energy and heating water;

[0014] a first heat exchanger connected to the solar collector via a solar collector outlet pipe and a solar collector inlet pipe, and used for indirectly transferring heat from the solar collector to return water in the open water tank;

[0015] an open water tank for storing hot water, balancing temperature fluctuations and providing a buffer, connected via a first water inlet pipe of the open water tank to a water outlet pipe of the first heat exchanger and a first water outlet pipe of the open water tank to a water inlet pipe of the first heat exchanger;

[0016] And a second heat exchanger connected to the open water tank through the second water outlet pipe and the second water inlet pipe of the open water tank and used for transferring heat in the open water tank to the return water on the user side.

[0017] Based on the above solution, the geothermal energy module includes:

[0018] Ground source heat pump units for energy conversion and temperature regulation;

[0019] A water distributor connected to the water outlet of the ground source heat pump unit and used for distributing and controlling the direction of water flow;

[0020] and a water collector connected to the water inlet end of the ground source heat pump unit for collecting return water and transporting it to underground circulation.

[0021] On the basis of the above scheme, it also includes: a geothermal energy module water supply pipe set on the water outlet end of the geothermal heat pump unit and a geothermal energy module return pipe set on the water inlet end of the geothermal heat pump unit.

[0022] Based on the above solution, the air energy module includes:

[0023] Air source heat pump unit;

[0024] an air energy module water supply pipe connected to the water inlet end of the pipe network;

[0025] and an air energy module return pipe connected to the water outlet end of the pipe network.

[0026] Based on the above solution, the user side includes:

[0027] Water supply mains for supplying water to users and return mains for returning water to users;

[0028] Wherein, a first water pump and a water supply control valve are sequentially arranged on the water supply main pipe along the fluid flow direction, and a return water control valve is arranged on the return water main pipe.

[0029] In addition, the present invention also provides a multi-energy coupling supply and storage method based on geothermal and solar energy cross-season and cross-time heat storage, using the supply and storage system, specifically including:

[0030] The solar module heating usage method is as follows: During the daytime in winter, the solar collector collects heat and transports the heat to the first heat exchanger through the solar collector outlet pipe, where it indirectly exchanges heat with the return water from the open water tank. The water with lowered temperature after the heat exchange returns to the solar collector through the solar collector inlet pipe, and circulates to collect heat; the return water from the open water tank absorbs heat in the first heat exchanger, and after heating, enters the open water tank through the first heat exchanger outlet pipe and the open water tank first inlet pipe, thereby raising the water temperature of the water tank; the hot water in the open water tank is transported to the second heat exchanger through the second heat exchanger outlet pipe of the open water tank, exchanges heat with the return water from the user side end, and then returns to the open water tank. The return water from the user side end passes through the return water main pipe, the solar module return water pipe, and the second heat exchanger inlet pipe in turn to enter the second heat exchanger, exchanges heat with the hot water from the open water tank in the second heat exchanger and heats up, and then passes through the second heat exchanger outlet pipe, the solar module water supply pipe, and the water supply main pipe in turn to supply heat to the end.

[0031] Based on the above scheme, the air energy module is used for heating and cooling: in winter, the air source heat pump unit absorbs air heat to provide heating, and hot water is supplied to the user side through the air energy module water supply pipe and the water supply main pipe respectively, and the return water from the user side returns to the air source heat pump unit through the return water main pipe and the air energy module return pipe to complete the heating cycle; in summer, the air source heat pump unit absorbs air cooling to provide cooling, and cold water is supplied to the user side through the air energy module water supply pipe and the water supply main pipe respectively, and the return water from the user side returns to the air source heat pump unit through the return water main pipe and the air energy module return pipe to complete the cooling cycle.

[0032] On the basis of the above scheme, the daytime heat storage method during the non-energy supply period and the energy supply period is as follows: the solar collector collects heat during the day, and after heating the water in the open water tank to the set temperature, it enters the water distributor to transport heat to the underground. The return water passes through the water collector and enters the first heat exchanger to exchange heat with the hot water from the outlet pipe of the solar collector, completing the cycle to achieve heat storage.

[0033] On the basis of the above scheme, the nighttime heat storage method during the non-energy supply period and the non-energy supply period of the energy supply period is as follows: at night, the hot water stored in the open water tank is used to store heat underground. The hot water in the open water tank is heat-exchanged with the return water from the underground heat storage in the second heat exchanger. After the heat exchange, the water with increased temperature enters the water distributor to transport heat to the underground. The return water passes through the water collector and enters the second heat exchanger, completing the cycle to realize heat storage.

[0034] Compared with existing systems, the present invention maximizes the use of solar energy, geothermal energy, and air energy for combined energy supply, solving problems such as large fluctuations in energy supply from a single renewable energy source and increased workload caused by intermittent equipment start-up and shutdown. It achieves coordinated mutual assistance among multiple energy sources, reduces reliance on backup energy, improves the utilization efficiency of the overall energy system, and achieves stable and continuous energy supply. At the same time, the energy supply system and energy storage device are combined to enhance synergy and avoid energy loss. In addition, the present invention has a modular design and can be flexibly configured according to local resource endowments. It is particularly suitable for areas with sufficient sunlight, cold or extremely cold regions. On the basis of achieving heating and cooling, the present invention uses solar energy to store heat in the soil across seasons and times during the non-energy supply period and the non-energy supply period of the energy supply period. This solves problems such as underground heating overload and low operating efficiency of ground source heat pump units in cold or extremely cold regions, and achieves sustainable utilization of geothermal resources. The cross-temporal heat storage achieved is carried out during the non-energy supply period of the energy supply period, which can quickly replenish soil heat loss caused by energy supply, accelerate soil temperature recovery, and compensate for the temperature decay of cross-seasonal heat storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the structure of the geothermal and solar energy cross-season and cross-time heat storage multi-energy coupling supply and storage system of the present invention;

[0036] Figure 2 Schematic diagram of the heating and cooling mode of the multi-energy coupling storage system based on geothermal and solar energy cross-season and cross-time heat storage of the present invention;

[0037] Figure 3 This is a schematic diagram of the heat storage mode of the multi-energy coupling supply and storage system based on geothermal and solar energy cross-season and cross-time heat storage of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments described below are intended to facilitate understanding of the present invention and do not have any limiting effect on the present invention.

[0039] like Figure 1 As shown, the present invention provides a multi-energy coupling supply and storage system based on geothermal and solar energy cross-season and cross-time heat storage, including:

[0040] Pipeline network;

[0041] Solar modules for heat supply and heat storage, respectively connected to the water inlet and outlet of the pipe network;

[0042] A geothermal energy module for heating and cooling cycles on the user side is connected to the water inlet and outlet of the solar module;

[0043] A user side connected to the water inlet and outlet of the solar energy module and the geothermal energy module;

[0044] and an air energy module for heating cycle or cooling cycle, which is in communication with the water inlet and outlet on the user side.

[0045] The above-mentioned system of the present invention includes a solar energy module, a geothermal energy module and an air energy module, and has two modes: heating and cooling and heat storage. In winter (heating period), solar collectors, ground source heat pump units and air source heat pump units are used to jointly provide heating; in summer (cooling period), ground source heat pump units and air source heat pump units are used to jointly provide cooling; solar energy is used to store soil heat during the non-energy supply period and the non-energy supply period of the energy supply period.

[0046] The operating principle of a multi-energy coupled heating and cooling system based on geothermal and solar energy cross-seasonal and cross-temporal heat storage is as follows: in winter, three heat sources, solar energy, geothermal energy, and air energy, are combined for heating, with the heat source type being switched based on terminal load demand. Solar collectors collect heat to raise the water temperature in the water tank, while ground-source heat pumps extract heat from the ground and air-source heat pumps extract heat from the air, supplying hot water to end users. In summer, geothermal energy and air energy are combined for cooling, with the cooling source type being switched based on terminal load demand. Ground-source heat pumps extract cooling from the ground and air-source heat pumps extract cooling from the air, supplying cold water to end users.

[0047] As a specific implementation scheme, the user side includes a water supply main pipe 22 for supplying water to the user and a return water main pipe 26 for returning water to the user; wherein, a first water pump 23 and a water supply control valve 24 are sequentially arranged on the water supply main pipe 22 along the fluid flow direction; and a return water control valve 25 is arranged on the return water main pipe 26.

[0048] like Figure 2 As shown, as a specific embodiment, the solar module includes:

[0049] A solar thermal collector 1 for collecting solar energy and heating water;

[0050] a first heat exchanger 2 connected to the solar collector 1 via a solar collector outlet pipe 10 and a solar collector inlet pipe 40, for indirectly transferring heat from the solar collector 1 to return water in the open water tank 3; wherein the water outlet of the first heat exchanger 2 on the side close to the open water tank 3 is connected to the first heat exchanger outlet pipe 11, and the water inlet of the first heat exchanger 2 on the side close to the open water tank 3 is connected to the first heat exchanger inlet pipe 38;

[0051] An open water tank 3 for storing hot water, balancing temperature fluctuations and providing a buffer, connected via the open water tank first water inlet pipe 13 to the first heat exchanger water outlet pipe 11 and the open water tank first water outlet pipe 35 to the first heat exchanger water inlet pipe 38;

[0052] A second heat exchanger 4 is connected to the open water tank 3 via the open water tank's second outlet pipe 16 and the open water tank's second inlet pipe 33, and is used to transfer heat from the open water tank 3 to the user-side return water. The outlet end of the second heat exchanger 4 is provided with a second heat exchanger outlet pipe 17, which is connected to the user-side water inlet via the solar module water supply pipe 20 for water supply. The user-side return water is connected to the second heat exchanger 4's water inlet via the solar module return pipe 28 and the second heat exchanger inlet pipe 31 for return water. A second water pump 29 is provided on the second heat exchanger inlet pipe 31.

[0053] like Figure 2 As shown, the solar module also includes: a solar collector outlet valve 9 provided on the solar collector outlet pipe 10 for opening and closing the solar collector 1; wherein the solar collector outlet valve 9 cooperates with the solar collector inlet valve 41 to jointly control the complete path of the collector circulation (outlet valve 9 is open, inlet valve 41 is open → circulation operation; both are closed → circulation stops), and is also linked with other valves in the system (such as the return water control valve 25, the water supply control valve 24, etc.) to ensure that the water flows according to the designed path.

[0054] A fifth water pump 39 for driving the circulating water flow of the solar collector 1 and a solar collector water inlet valve 41 for controlling the start and stop of the solar collector 1 are sequentially arranged on the solar collector water inlet pipe 40 along the fluid flow direction;

[0055] a fourth water pump 37 provided on the first heat exchanger water inlet pipe 38 for driving the circulating water flow between the first heat exchanger 2 and the open water tank 3;

[0056] An open water tank outlet control valve 15 is provided on the second water outlet pipe 16 of the open water tank for controlling the opening and closing of the water outlet of the open water tank 3;

[0057] A third water pump 32 for driving the circulating water flow between the second heat exchanger 4 and the open water tank 3 and an open water tank water inlet control valve 34 for controlling the opening and closing of the water inlet of the open water tank 3 are arranged in sequence along the fluid flow direction on the second water inlet pipe 33 of the open water tank.

[0058] In order to connect the solar module with the geothermal energy module, it also includes: a first tee 12 connected between the first heat exchanger outlet pipe 11 and the first water inlet pipe 13 of the open water tank for connecting to the water outlet end of the geothermal energy module, and a fourth tee 36 arranged on the first water outlet pipe 35 of the open water tank for connecting to the water inlet end of the geothermal energy module.

[0059] The method of using the above-mentioned solar module for heating is as follows: open the solar collector water outlet valve 9, the first three-way valve 12AB direction, the open water tank water outlet control valve 15, the second three-way valve 18AB direction, the first four-way valve 21AC direction, the first water pump 23, the water supply control valve 24, the return water control valve 25, the second four-way valve 27AC direction, the second water pump 29, the third three-way valve 30AB direction, the third water pump 32, the open water tank water inlet control valve 34, the fourth three-way valve 36AB direction, the fourth water pump 37, the fifth water pump 39, and the solar collector water inlet valve 41. The remaining valves, three-way valves and water pumps are all closed. During the daytime in winter, the solar collector 1 collects heat and transmits the heat to the first heat exchanger 2 through the solar collector outlet pipe 10, and indirectly exchanges heat with the return water from the open water tank 3. The water with lowered temperature after heat exchange returns to the solar collector 1 through the solar collector inlet pipe 40, and circulates to collect heat; the return water from the open water tank 3 absorbs heat in the first heat exchanger 2, and after being heated, enters the open water tank 3 through the first heat exchanger outlet pipe 11 and the open water tank first inlet pipe 13, thereby increasing the water temperature of the water tank; the open water The hot water in the water tank 3 is transported to the second heat exchanger 4 through the second water outlet pipe 16 of the open water tank, exchanges heat with the return water from the user-side end, and then returns to the open water tank 3. The return water from the user-side end passes through the return water main pipe 26, the solar module return water pipe 28 and the second heat exchanger inlet pipe 31 in sequence to enter the second heat exchanger 4, exchanges heat with the hot water from the open water tank 3 in the second heat exchanger 4, and then heats up through the second heat exchanger outlet pipe 17, the solar module water supply pipe 20 and the water supply main pipe 22 in sequence to supply heat to the end.

[0060] As a specific implementation scheme, the geothermal energy module includes: a ground source heat pump unit 8 for energy conversion and temperature regulation, a water distributor 6 connected to the water outlet of the ground source heat pump unit 8 for distributing and controlling the direction of water flow, and a water collector 7 connected to the water inlet of the ground source heat pump unit 8 for collecting return water and transporting it to underground circulation.

[0061] Specifically, the water outlet of the ground source heat pump unit 8 is connected to the water distributor 6 through the fourth water inlet pipe 47 of the water distributor and the water inlet main pipe 45 of the water distributor along the fluid flow direction, wherein the water distributor 6 supplies water to the buried pipe through the water outlet main pipe 46 of the water distributor;

[0062] The water outlet end of the water collector 7 is connected to the water inlet end of the ground source heat pump unit 8 through the water collector outlet main pipe 51 and the water collector first outlet pipe 49 along the fluid flow direction; a sixth water pump 48 is provided on the first water collector outlet pipe 49 for driving the circulating water flow between the water collector 7 and the ground source heat pump unit 8, wherein the water collector 7 collects the return water of the buried pipe through the water collector inlet main pipe 52.

[0063] In order to ensure the communication between the geothermal energy module and the air energy module, it also includes: a geothermal energy module water supply pipe 59 arranged on the water outlet end of the geothermal energy module 8 and a geothermal energy module return pipe 60 arranged at the water inlet end; wherein, a geothermal energy module water outlet control valve 58 for opening and closing the water outlet of the geothermal heat pump unit 8 is arranged on the geothermal energy module water supply pipe 59, a geothermal energy module water inlet control valve 61 for opening and closing the water inlet of the geothermal heat pump unit 8 is arranged on the geothermal energy module return pipe 60 along the fluid flow direction, and an eighth water pump 62 for driving the circulation between the air energy module and the geothermal heat pump unit 8.

[0064] like Figure 2 As shown, the method of using the above-mentioned geothermal energy module for heating and cooling is as follows: open the first four-way valve 21DC direction, the first water pump 23, the water supply control valve 24, the return water control valve 25, the second four-way valve 27CD direction, the sixth three-way valve 44BC direction, the sixth water pump 48, the seventh three-way valve 50AC direction, the ground source heat pump unit water outlet control valve 58, the ground source heat pump unit water inlet control valve 61, and the eighth water pump 62. The remaining valves, three-way valves and water pumps are all closed. In winter, the geothermal heat pump unit 8 extracts underground heat through the water collector 7, the water collector outlet main pipe 51, and the water collector first outlet pipe 49, and further heats the water in the geothermal heat pump unit 8. The water that reaches the water supply temperature after heating is supplied to the end user through the geothermal energy module water supply pipe 59 and the water supply main pipe 22. The return water from the end user returns to the geothermal heat pump unit 8 through the return water main pipe 26 and the geothermal energy module return water pipe 60, and returns to the underground through the water distributor fourth inlet pipe 47, the water distributor water inlet main pipe 45, and the water distributor 6 in turn, completing the heating cycle. In summer, the ground source heat pump unit 8 extracts underground cooling energy through the water collector 7, the water collector outlet main pipe 51, and the water collector first outlet pipe 49, and further cools it in the ground source heat pump unit 8. The water that reaches the water supply temperature after cooling is supplied to the user side through the geothermal energy module water supply pipe 59 and the water supply main pipe 22. The return water from the user side returns to the ground source heat pump unit 8 through the return water main pipe 26 and the geothermal energy module return water pipe 60, and returns to the underground through the water distributor fourth inlet pipe 47, the water distributor water inlet main pipe 45, and the water distributor 6 in turn, completing the cooling cycle.

[0065] As a specific embodiment, the air energy module includes an air source heat pump unit 5, an air source heat pump unit water supply pipe 63 connected to the geothermal module water supply pipe 59, and an air source heat pump unit return pipe 65 connected to the geothermal module return pipe 60. The air source heat pump unit 5 absorbs heat from the air in winter and releases heat to the air in summer, transmitting energy to the terminal through the air source heat pump unit water supply pipe 63 and the air source heat pump unit return pipe 65. A ninth water pump 64 is provided on the air source heat pump unit return pipe 65.

[0066] like Figure 2As shown, the method of using the above-mentioned air energy module for heating and cooling is as follows: open the first four-way valve 21BC, the first water pump 23, the water supply control valve 24, the return water control valve 25, the second four-way valve 27BC, and the ninth water pump 64, and the remaining valves, three-way valves and water pumps are all closed. In winter, the air source heat pump unit 5 absorbs the heat of the air to provide heating, and the hot water is supplied to the user side through the air energy module water supply pipe 63 and the water supply main pipe 22 respectively. The return water from the user side returns to the air source heat pump unit 5 through the return water main pipe 26 and the air energy module return water pipe 65, completing the heating cycle. In summer, the air source heat pump unit 5 absorbs the cold air to provide cooling, and the cold water is supplied to the user side through the air energy module water supply pipe 63 and the water supply main pipe 22 respectively. The return water from the user side returns to the air source heat pump unit 5 through the return water main pipe 26 and the air energy module return water pipe 65, completing the cooling cycle.

[0067] In order to utilize solar energy to store heat during the non-energy supply period and the non-energy supply period during the energy supply period to solve the problem of underground cold accumulation, first, heat is stored through the first heat exchanger 2, which also includes: a first water inlet pipe 14 and a third water inlet pipe 43 of the water distributor are arranged along the fluid flow direction between the first tee 12 and the water distributor 6; a second water outlet pipe 54 and a third water outlet pipe 56 of the water distributor are arranged along the fluid flow direction between the water collector 7 and the fourth tee 36; wherein, a seventh water pump 53 is provided on the second water outlet pipe 54 of the water collector;

[0068] Secondly, using the second heat exchanger 4 to store heat also includes: connecting the second heat exchanger outlet pipe 17 and the third water inlet pipe 43 of the water distributor through the second water inlet pipe 19 of the water distributor and the fifth three-way connection 42 to transport the hot water output from the second heat exchanger 4 to the water distributor 6;

[0069] The second water outlet pipe 54 of the water collector and the water inlet pipe 31 of the second heat exchanger are connected through the eighth three-way valve 55 and the fourth water outlet pipe 57 of the water collector to transport the return water of the water collector 7 to the second heat exchanger 4.

[0070] In addition to the tees mentioned above, the system also includes: a second tee 18 for connecting the second heat exchanger outlet pipe 17 and the solar module water supply pipe 20; a first four-way 21 for connecting the solar module water supply pipe 20, the geothermal module water supply pipe 59, the air module water supply pipe 63 and the water supply main pipe 22; a second four-way 27 for connecting the return water main pipe 26 and the air module return water pipe 65, the geothermal module return water pipe 60, and the solar module return water pipe 28; a second four-way 28 for connecting the solar module return water pipe 20 and the geothermal module return water pipe 65; a second four-way 29 for connecting the solar module return water pipe 20 and the geothermal module return water pipe 60; a second four-way 29 for connecting the solar module return water pipe 20 and the geothermal module return water pipe 65; a second four-way 29 for connecting the solar module return water pipe 20 and the geothermal module return water pipe 60; a second four-way 29 for connecting the solar module return water pipe 20 and the geothermal module return water pipe 63 ...3; a second four-way 29 for connecting the solar module return water pipe 20 and the geothermal module return water pipe 63; a second four-way 29 for connecting the solar module return water pipe 20 and the geothermal module return water pipe 63; a second four-way 29 for connecting The third tee 30 of the pipe 28, the fourth water outlet pipe 57 of the water collector and the water inlet pipe 31 of the second heat exchanger; the fifth tee 42 for connecting the first water inlet pipe 14 of the water distributor, the second water inlet pipe 19 of the water distributor and the third water inlet pipe 43 of the water distributor; the sixth tee 44 for connecting the third water inlet pipe 43 of the water distributor, the water inlet main pipe 45 of the water distributor and the fourth water inlet pipe 47 of the water distributor; and the seventh tee 50 for connecting the first water outlet pipe 49 of the water collector, the second water outlet pipe 54 of the water collector and the water outlet main pipe 51 of the water collector.

[0071] like Figure 3 As shown, a heat storage mode based on geothermal and solar energy cross-season and cross-time heat storage multi-energy coupling supply and storage system is to use solar energy for soil heat storage. The heat storage mode is used as follows:

[0072] During the non-energy supply period and the daytime heat storage during the non-energy supply period of the energy supply period: open the solar collector outlet valve 9, the first three-way valve 12AC direction, the open water tank outlet control valve 15, the fourth three-way valve 36CB direction, the fourth water pump 37, the fifth water pump 39, the solar collector inlet valve 41, the fifth three-way valve 42AB direction, the sixth three-way valve 44AC direction, the seventh three-way valve 50CB direction, the seventh water pump 53, and the eighth three-way valve 55AB direction. The remaining valves, three-way valves, four-way valves and water pumps are all closed.

[0073] The solar collector 1 collects heat during the day, and after heating the water in the open water tank 3 to the set temperature, the water passes through the first tee 12AC direction, the first water inlet pipe 14 of the water distributor, the fifth tee 42AB direction, the third water inlet pipe 43 of the water distributor, the sixth tee 44AC direction, and the water inlet main pipe 45 of the water distributor, and enters the water distributor 6 to transport heat to the underground. The return water passes through the water collector 7, and passes through the water collector outlet main pipe 51, the seventh tee 50CB direction, the second water outlet pipe 54 of the water collector, the eighth tee 55AB direction, the third water outlet pipe 56 of the water collector, the fourth tee 36CB direction, and the first heat exchanger inlet pipe 38, and enters the first heat exchanger 2 to exchange heat with the hot water from the solar collector outlet pipe 10, completing the cycle and realizing heat storage.

[0074] Heat storage at night during the non-energy supply period and the non-energy supply period during the energy supply period: open the open water tank water outlet control valve 15, the second three-way valve 18AC direction, the third three-way valve 30AC direction, the third water pump 32, the open water tank water inlet control valve 34, the fifth three-way valve 42CB direction, the sixth three-way valve 44AC direction, the seventh three-way valve 50CB direction, the seventh water pump 53, and the eighth three-way valve 55AC direction. The remaining valves, three-way valves, four-way valves and water pumps are all closed.

[0075] At night, the hot water stored in the open water tank 3 is used to store heat underground. The hot water in the open water tank 3 exchanges heat with the return water from the underground heat storage in the second heat exchanger 4. The water with increased temperature after heat exchange passes through the second heat exchanger outlet pipe 17, the second tee 18 AC direction, the water distributor second water inlet pipe 19, the fifth tee 42CB direction, the water distributor third water inlet pipe 43, the sixth tee 44 AC direction, the water distributor inlet main pipe 45, and enters the water distributor 6 to transport heat underground. The return water passes through the water collector 7 and passes through the water collector outlet main pipe 51, the seventh tee 50CB direction, the water collector second water outlet pipe 54, the eighth tee 55 AC direction, the water collector fourth water outlet pipe 57, the third tee 30AC direction, and the second heat exchanger inlet pipe 31, and enters the second heat exchanger 4, completing the cycle and realizing heat storage.

[0076] In this embodiment, a heating and cooling mode based on a geothermal and solar energy cross-season and cross-time heat storage multi-energy coupling storage system can simultaneously realize solar energy, geothermal energy and air energy heating in winter, and can also switch the heat source form for heating according to the terminal load demand; it can simultaneously realize geothermal energy and air energy cooling in summer, and can also switch the cold source form for cooling according to the terminal load demand.

[0077] In this embodiment, the solar module includes a solar collector 1, a first heat exchanger 2, an open water tank 3, and a second heat exchanger 4. The solar collector 1 and the first heat exchanger 2 are connected through a solar collector outlet pipe 10 and a solar collector inlet pipe 40 to realize a heat extraction cycle, which is a separate circulation loop. The solar collector inlet pipe 40 is provided with a fifth water pump 39, and the solar collector outlet pipe 10 and the solar collector inlet pipe 40 are respectively provided with a solar collector outlet valve 9 and a solar collector inlet valve 41; the first heat exchanger 2 and the open water tank 3 are connected through the first heat exchanger outlet pipe 11, the open water tank first inlet pipe 13, and the open water tank first outlet pipe 3. 5. The first heat exchanger water inlet pipe 38 is connected to realize the heat exchange cycle, which is a separate circulation loop. The first heat exchanger water inlet pipe 38 is provided with a fourth water pump 37; the open water tank 3 and the second heat exchanger 4 are connected through the open water tank second water outlet pipe 16 and the open water tank second water inlet pipe 33 to realize the heat extraction cycle, which is a separate circulation loop. The open water tank second water inlet pipe 33 is provided with a third water pump 32, and the open water tank second water outlet pipe 16 and the open water tank second water inlet pipe 33 are respectively provided with an open water tank water outlet control valve 15 and an open water tank water inlet control valve 34.

[0078] In this embodiment, the geothermal energy module includes a water distributor 6, a water collector 7, and a ground source heat pump unit 8; the ground source heat pump unit 8 realizes an underground energy circulation through the fourth water inlet pipe 47 of the water distributor, the water inlet main pipe 45 of the water distributor, the water outlet main pipe 51 of the water collector, and the first water outlet pipe 49 of the water collector, which is a separate circulation loop, and a sixth water pump 48 is provided on the first water outlet pipe 49 of the water collector; the ground source heat pump unit 8 realizes an energy supply circulation through the geothermal energy module water supply pipe 59 and the geothermal energy module return pipe 60, which is a separate circulation loop, and an eighth water pump 62 is provided on the geothermal energy module return pipe 60, and the geothermal energy module water supply pipe 59 and the geothermal energy module return pipe 60 are respectively provided with a ground source heat pump unit water outlet control valve 58 and a ground source heat pump unit water inlet control valve 61.

[0079] The system of the present invention can operate in both heating and cooling modes, as well as heat storage. The heating and cooling mode provides heating in winter and cooling in summer, while the heat storage mode allows for cross-seasonal and multi-season heat storage. Furthermore, the system features a modular design, implemented using a combination of solar, geothermal, and air energy modules. The solar modules provide only heating, while the geothermal and air energy modules provide both heating and cooling. This results in a simple system that is easy to install and maintain.

[0080] In winter, the ground source heat pump unit 8 of the above-mentioned geothermal energy module absorbs the heat of the formation through the heat exchange of the buried pipes and the heat transfer medium (water or antifreeze) collected by the water collector 7, generates hot water to supply heat to the end, and releases the cold energy to the formation through the water distributor 6 and the buried pipes; in summer, the heat of the end is taken away by the heat exchange of the buried pipes and the heat transfer medium collected by the water collector 7, and released to the formation through the water distributor 6 and the buried pipes.

[0081] The above-mentioned air energy module includes an air source heat pump unit 5 that absorbs air heat in winter and releases heat to the air in summer, and realizes energy transmission to the end through the air energy module supply and return pipes.

[0082] After the above-mentioned solar modules, geothermal modules and air energy modules produce hot / cold water, the solar module water supply pipe, geothermal module water supply pipe and air energy module water supply pipe are respectively connected to the water supply main pipe through the first four-way pipe, and energy is uniformly supplied to the end through the water supply main pipe; the return water main pipe is respectively connected to the solar module water supply pipe, geothermal module water supply pipe and air energy module water supply pipe through the second four-way pipe.

[0083] The working principle of a heat storage mode based on geothermal and solar energy cross-season and cross-time heat storage multi-energy coupling supply and storage system is as follows:

[0084] During the daytime, during the off-energy period and the off-energy period of the energy supply period, the solar collectors collect heat and prioritize heating the water in the open water tank. When the water temperature in the open water tank reaches the set temperature, heating stops and heat is transferred underground through the first water inlet pipe of the water distributor. During the nighttime, during the off-energy period and the off-energy period of the energy supply period, water stored in the open water tank during the day is used to transfer heat underground through the second water inlet pipe of the water distributor. The purpose of heat storage is to solve the problem of underground cold accumulation caused by ground-source heat pump heating and improve the heating efficiency of the ground-source heat pump unit during the heating period.

[0085] The system and method of this embodiment proposes a multi-energy coupled supply and storage system based on geothermal and solar energy for cross-seasonal and cross-temporal heat storage. This system features a rationally designed structure, integrates multiple renewable energy sources, and utilizes them complementary at different times and under different conditions, improving overall stability. Furthermore, using solar energy for heat storage during off-seasons solves the problem of underground cold accumulation, achieving integrated energy supply and storage.

[0086] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A multi-energy coupling supply and storage system based on geothermal and solar energy cross-season and cross-time heat storage, characterized by: include: Pipeline network; Solar modules for heat supply and heat storage, respectively connected to the water inlet and outlet of the pipe network; A geothermal energy module connected to the water inlet and outlet of the solar module for performing a heating cycle and a cooling cycle for the user side; A user side connected to the water inlet and outlet of the solar energy module and the geothermal energy module; and an air energy module for heating cycle or cooling cycle, which is in communication with the water inlet and outlet on the user side.

2. The multi-energy coupling supply and storage system based on geothermal and solar energy cross-season and cross-time heat storage according to claim 1 is characterized in that: The solar module comprises: Solar thermal collectors (1) for collecting solar energy and heating water; a first heat exchanger (2) connected to the solar collector (1) via a solar collector outlet pipe (10) and a solar collector inlet pipe (40), and used for indirectly transferring heat from the solar collector (1) to return water in the open water tank (3); An open water tank (3) for storing hot water, balancing temperature fluctuations and providing a buffer, connected via a first water inlet pipe (13) of the open water tank to a water outlet pipe (11) of the first heat exchanger and a first water outlet pipe (35) of the open water tank to a water inlet pipe (38) of the first heat exchanger; and a second heat exchanger (4) connected to the open water tank (3) via the open water tank second water outlet pipe (16) and the open water tank second water inlet pipe (33) for transferring heat in the open water tank (3) to user-side return water.

3. The multi-energy coupling supply and storage system based on geothermal and solar energy cross-season and cross-time heat storage according to claim 1 is characterized in that: The geothermal energy module comprises: Ground source heat pump units for energy conversion and temperature regulation (8); A water distributor (6) connected to the water outlet of the ground source heat pump unit (8) for distributing and controlling the direction of water flow; and a water collector (7) connected to the water inlet end of the ground source heat pump unit (8) for collecting return water and transporting it to underground circulation.

4. The multi-energy coupling supply and storage system based on geothermal and solar energy cross-season and cross-time heat storage according to claim 3 is characterized in that: Also includes: A geothermal energy module water supply pipe (59) is provided on the water outlet end of the geothermal heat pump unit (8), and a geothermal energy module water return pipe (60) is provided on the water inlet end of the geothermal heat pump unit (8).

5. The multi-energy coupling supply and storage system based on geothermal and solar energy cross-season and cross-time heat storage according to claim 1 is characterized in that: The air energy module includes: Air source heat pump unit (5); an air energy module water supply pipe (63) in communication with the water inlet end of the pipe network; and an air energy module return pipe (65) connected to the water outlet end of the pipe network.

6. The multi-energy coupling supply and storage system based on geothermal and solar energy cross-season and cross-time heat storage according to claim 1 is characterized in that: The user side includes: A water supply main (22) for supplying water to users and a water return main (26) for returning water to users; A first water pump (23) and a water supply control valve (24) are sequentially arranged on the water supply main pipe (22) along the fluid flow direction, and a return water control valve (25) is arranged on the return water main pipe (26).

7. A multi-energy coupling supply and storage method based on geothermal and solar energy cross-season and cross-time heat storage, characterized in that: The supply and storage system according to any one of claims 1 to 6 specifically comprises: The method for using the solar module for heating is as follows: during the daytime in winter, the solar collector (1) collects heat, and the heat is transported to the first heat exchanger (2) through the solar collector outlet pipe (10), and indirectly exchanges heat with the return water from the open water tank (3). After the heat exchange, the water with a lower temperature returns to the solar collector (1) through the solar collector inlet pipe (40), and circulates to collect heat; the return water from the open water tank (3) absorbs heat in the first heat exchanger (2), and after being heated, enters the open water tank (3) through the first heat exchanger outlet pipe (11) and the open water tank first inlet pipe (13), thereby achieving the water temperature increase of the water tank. The hot water in the open water tank (3) is transported to the second heat exchanger (4) through the second water outlet pipe (16) of the open water tank, exchanges heat with the return water from the user side end, and then returns to the open water tank (3). The return water from the user side end sequentially passes through the return water main pipe (26), the solar module return water pipe (28), and the second heat exchanger inlet pipe (31) to enter the second heat exchanger (4), exchanges heat with the hot water from the open water tank (3) in the second heat exchanger (4), and then heats up. The return water then passes through the second heat exchanger outlet pipe (17), the solar module water supply pipe (20), and the water supply main pipe (22) to supply heat to the end.

8. The method for multi-energy coupling supply and storage based on geothermal and solar energy cross-season and cross-time heat storage according to claim 7 is characterized in that: Method for using the air energy module for heating and cooling: in winter, the air source heat pump unit (5) absorbs heat from the air to provide heat, and hot water is supplied to the user side through the air energy module water supply pipe (63) and the water supply main pipe (22), and the return water from the user side returns to the air source heat pump unit (5) through the return water main pipe (26) and the air energy module return water pipe (65), completing the heating cycle; In summer, the air source heat pump unit (5) absorbs the cold air to provide cooling, and the cold water is supplied to the user side through the air energy module water supply pipe (63) and the water supply main pipe (22). The return water from the user side returns to the air source heat pump unit (5) through the return water main pipe (26) and the air energy module return water pipe (65), completing the cooling cycle.

9. The method for multi-energy coupling supply and storage based on geothermal and solar energy cross-season and cross-time heat storage according to claim 7 is characterized in that: The method for storing heat during the daytime in the non-energy supply period and the non-energy supply period of the energy supply period is as follows: the solar collector (1) collects heat during the daytime, and after heating the water in the open water tank (3) to a set temperature, enters the water distributor (6) to transport heat to the ground, and the return water passes through the water collector (7) and enters the first heat exchanger (2) to exchange heat with the hot water from the solar collector outlet pipe (10), completing the cycle to achieve heat storage.

10. The method for multi-energy coupling supply and storage based on geothermal and solar energy cross-season and cross-time heat storage according to claim 7, characterized in that: A method for storing heat at night during the non-energy supply period and the non-energy supply period of the energy supply period: at night, hot water stored in an open water tank (3) is used to store heat underground. The hot water in the open water tank (3) exchanges heat with return water from underground heat storage in a second heat exchanger (4). After the heat exchange, the water with a higher temperature enters a water distributor (6) to transport heat to the underground. The return water passes through a water collector (7) and enters the second heat exchanger (4), completing the cycle to achieve heat storage.

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