Geothermal heating system integrating electricity price response and heat storage scheduling strategy

Abstract

The invention discloses a geothermal heat supply system integrating electricity price response and a heat storage scheduling strategy, belongs to the technical field of geothermal heat supply, and can solve the problems that an existing single geothermal heat supply system is low in efficiency and poor in stability. The system comprises a deep geothermal well; a photo-thermal module; the temperature commutator comprises an inlet end and a plurality of outlet ends; the deep geothermal well and the photo-thermal module are both communicated with the inlet end; the temperature reverser is used for detecting the temperature of the heat exchange fluid at the inlet end and controlling the outflow direction of the heat exchange fluid according to the temperature; the heat storage module comprises a heat storage heating unit and a heat storage water supply unit which are connected to different outlet ends of the temperature reverser, and the heat storage temperature of the heat storage heating unit is higher than that of the heat storage water supply unit; and the control module is used for controlling the deep geothermal well and the photo-thermal module to store heat to the heat storage module in the valley electricity period of the heat consumption valley period and controlling the heat storage module to release heat to the user side in the peak electricity period of the heat consumption peak period. The device is used for geothermal heat supply.

Description

Technical Field

[0001] This invention relates to a geothermal heating system that integrates electricity price response and thermal storage scheduling strategies, belonging to the field of geothermal heating technology. Background Technology

[0002] Developing geothermal energy systems is an important means to promote the green energy transition, enhance energy security, and foster sustainable economic development. As a clean, stable, and renewable energy source, geothermal energy will play a vital role in the future energy system. Geothermal energy utilization systems, with their excellent output power unaffected by weather and time, have become an important component of energy solutions. Among them, deep geothermal reservoir systems demonstrate highly efficient heat recovery capabilities, with a maximum heat storage efficiency of up to 80%, further enhancing the reliability and effectiveness of the system.

[0003] However, existing single geothermal energy heating systems mainly have the following problems: resources depend on specific geological conditions, are unevenly distributed and may decay; large initial investment, difficult operation and maintenance, and poor economic efficiency; improper extraction may cause environmental problems such as subsidence and water pollution; and the system has weak regulation capacity and is difficult to cope with load fluctuations. Summary of the Invention

[0004] This invention provides a geothermal heating system that integrates electricity price response and thermal storage scheduling strategies, which can solve the problems of low efficiency and poor stability of existing single geothermal heating systems.

[0005] This invention provides a geothermal heating system that integrates electricity price response and thermal storage scheduling strategies, the system comprising: Deep geothermal wells are used to provide geothermal energy. A solar thermal module is used to collect solar energy and convert it into heat energy; A temperature reversing device includes an inlet end and multiple outlet ends; the deep geothermal well and the photothermal module are both connected to the inlet end; the temperature reversing device is used to detect the temperature of the heat exchange fluid flowing into the inlet end and control the outflow direction of the heat exchange fluid according to the temperature of the heat exchange fluid. The thermal storage module includes a thermal storage heating unit and a thermal storage water supply unit connected to different outlets of the temperature converter. The thermal storage temperature of the thermal storage heating unit is greater than that of the thermal storage water supply unit. The thermal storage heating unit is used to provide heating to the user end, and the thermal storage water supply unit is used to supply water to the user end. The control module is connected to the deep geothermal well, the solar thermal module, the temperature converter, and the thermal storage module. It is used to control the deep geothermal well and the solar thermal module to store heat in the thermal storage module during off-peak electricity periods when heating demand is low, and to control the thermal storage module to release heat to the user during peak electricity periods when heating demand is high.

[0006] Optionally, the temperature commutator includes a first outlet terminal, a second outlet terminal, and a third outlet terminal; The thermal storage heating unit includes a first thermal accumulator connected to the first outlet end and a second thermal accumulator connected to the second outlet end; the thermal storage temperature of the first thermal accumulator is greater than the thermal storage temperature of the second thermal accumulator; the thermal storage water supply unit is connected to the third outlet end. The control module is specifically used to control the first heat storage device and the second heat storage device to release heat to the user terminal in sequence during peak electricity periods of peak heating season.

[0007] Optionally, the thermal storage heating unit further includes: The first heat pump is connected to the second heat accumulator and is used to heat the heat exchange fluid in the second heat accumulator. A secondary heat storage device is connected to the first heat pump on one side and to the user terminal on the other side. It is used to store the heat of the heat exchange fluid after it is heated in the first heat pump and to provide heating to the user terminal during the peak heating period. The control module is connected to both the first heat pump and the secondary heat storage device, and is used to control the first heat pump and the secondary heat storage device to work when the heat storage temperature in the second heat storage device is lower than the heating temperature and the current period is a low-electricity period.

[0008] Optionally, the deep geothermal well is connected to the user terminal via a pipeline; the temperature converter is also used to detect the heat source temperature of the deep geothermal well. The control module is also used to control the deep geothermal well to supply heat to the user end when the heat source temperature of the deep geothermal well is greater than or equal to the heating temperature.

[0009] Optionally, the deep geothermal well is connected to the first heat pump via a pipeline; the first heat pump is connected to the user terminal via a pipeline. The control module is also used to control the first heat pump to heat the heat exchange fluid in the deep geothermal well when the heat source temperature of the deep geothermal well is lower than the heating temperature, and to use the heat of the heated heat exchange fluid to provide heating to the user end.

[0010] Optionally, the system further includes: A shallow geothermal well, connected to the user terminal, is used to provide geothermal energy; A thermometer is used to detect the heat source temperature of the shallow geothermal well; The control module is connected to the thermometer and is used to control the shallow geothermal well to supply heat to the user when the heat source temperature of the shallow geothermal well is greater than or equal to the heating temperature.

[0011] Optionally, the system further includes: A second heat pump is connected between the shallow geothermal well and the user terminal; The control module is connected to the second heat pump and is used to control the second heat pump to heat the heat exchange fluid in the shallow geothermal well when the heat source temperature of the shallow geothermal well is lower than the heating temperature, and to use the heat of the heated heat exchange fluid to provide heating to the user end.

[0012] Optionally, the first heat accumulator is connected to the first heat pump via a pipeline; The control module is also used to control the first heat pump to heat the heat exchange fluid in the first heat storage tank, and to use the heat of the heated heat exchange fluid to provide heating to the user end.

[0013] Optionally, the thermal storage water supply unit is connected to the first heat pump via a pipeline; The control module is also used to control the first heat pump to heat the heat exchange fluid in the heat storage and water supply unit, and to use the heat of the heated heat exchange fluid to supply water to the user end.

[0014] Optionally, the shallow geothermal well is connected to both the thermal storage module and the solar thermal module via pipelines; The control module is also used to control the thermal storage module and the solar thermal module to replenish heat to the shallow geothermal well during off-peak electricity periods when heat demand is low. The beneficial effects that this invention can produce include: This invention provides a geothermal heating system that integrates electricity price response and thermal storage scheduling strategies. By configuring thermal storage modules and automatic control modules, it accurately matches energy supply and demand, enhancing the system's flexibility and adaptability. For office building applications, the system deeply couples with electricity market price signals: during the heating season, it utilizes off-peak electricity price periods to drive the circulation pipeline for cascaded storage of geothermal energy, with solar energy and heat pumps serving as auxiliary heat sources; during peak electricity price periods, it releases heat energy to meet heating demand, thereby smoothing grid load fluctuations and reducing operating costs; during the non-heating season, the geothermal system fully utilizes solar thermal modules to collect solar heat, both for cross-seasonal thermal storage of geothermal wells and for supplying domestic hot water, achieving high-value utilization of geothermal resources. This significantly improves the energy utilization efficiency of the geothermal energy coupling system and promotes the synergistic integration and efficient application of renewable energy.

[0015] This invention provides a geothermal heating system integrating electricity price response and thermal storage scheduling strategies. By integrating deep geothermal, shallow geothermal, solar thermal, and thermal storage technologies, combined with heat pump technology and peak-valley electricity price regulation mechanisms, it constructs a multi-energy coupled energy storage and heating system that integrates cross-seasonal geothermal energy storage, phase change thermal storage, and solar thermal utilization. Simultaneously, by incorporating a temperature reversing device, this invention can accurately identify the current heat extraction temperature range when solar thermal and geothermal energy are used as heat sources, and divert the heat through its internal control structure, achieving cascaded thermal energy storage from the geothermal well side. Furthermore, this invention efficiently integrates solar resources and heat pump technology as auxiliary heat sources, significantly reducing the overall system operating cost while fully meeting energy demand. During the non-heating season, the system uses solar thermal energy as the primary heat source for domestic hot water supply and supplemental heating from shallow geothermal energy. Furthermore, this invention proposes different operating conditions formed by geothermal, solar, and heat pump coupling through a thermal storage module. These conditions are deeply linked to electricity market price signals, enabling cascaded storage and flexible utilization of thermal energy. Dynamic optimization of heat output is achieved, forming a multi-energy collaborative control mechanism centered on geothermal energy. This efficiently meets the diverse heat demands for heating and domestic hot water. This comprehensive solution not only improves energy efficiency but also enables intelligent and low-cost operation of building energy systems. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the geothermal heating system structure that integrates electricity price response and thermal storage scheduling strategies, as provided in an embodiment of the present invention. Figure label: 1. Deep geothermal well; 2. Shallow geothermal well; 3. Geothermal well water distributor; 4. Geothermal well water collector; 5. Temperature reversing device; 6. First heat accumulator; 7. Second heat accumulator; 8. Thermal storage and water supply unit; 9. First heat pump; 10. Secondary heat accumulator; 11. Second heat pump; 12. User water distributor; 13. User water collector; 14. Heat user; 15. Photothermal module; 16. Heat exchanger; 17. Thermometer; 18. First valve; 19. Second valve; 20. Third valve; 21. Fourth valve; 22. ... 5. Valve; 23. 6. Valve; 24. 7. Valve; 25. 8. Valve; 26. 9. Valve; 27. 10. Valve; 28. 11. Valve; 29. ​​12. Valve; 30. 13. Valve; 31. 14. Valve; 32. 15. Valve; 33. 16. Valve; 34. 17. Valve; 35. 18. Valve; 36. 19. Valve; 37. 20. Valve; 38. 21. Valve; 39. 22. Valve; 40. 23. Valve; 41. 24. Valve. Detailed Implementation

[0017] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0018] This invention provides a geothermal heating system that integrates electricity price response and thermal storage scheduling strategies, such as... Figure 1 As shown, the system includes: Deep geothermal well 1 is used to provide geothermal energy; Solar thermal module 15 is used to collect solar energy and convert it into heat energy; Temperature commutator 5 includes an inlet end and multiple outlet ends; the deep geothermal well 1 and the solar thermal module 15 are both connected to the inlet end; the temperature commutator 5 is used to detect the temperature of the heat exchange fluid flowing into the inlet end and control the outflow direction of the heat exchange fluid according to the temperature of the heat exchange fluid. The thermal storage module includes a thermal storage heating unit and a thermal storage water supply unit 8 connected to different outlets of the temperature converter 5. The thermal storage temperature of the thermal storage heating unit is greater than that of the thermal storage water supply unit 8. The thermal storage heating unit is used to provide heating to the user end, and the thermal storage water supply unit 8 is used to supply water to the user end. The control module is connected to the deep geothermal well 1, the solar thermal module 15, the temperature converter 5, and the heat storage module. It is used to control the deep geothermal well 1 and the solar thermal module 15 to store heat in the heat storage module during the off-peak electricity period when the heat demand is low, and to control the heat storage module to release heat to the user during the peak electricity period when the heat demand is high.

[0019] The temperature commutator 5 includes a first outlet end, a second outlet end, and a third outlet end; The thermal storage heating unit includes a first thermal accumulator 6 connected to the first outlet end and a second thermal accumulator 7 connected to the second outlet end; the thermal storage temperature of the first thermal accumulator 6 is greater than the thermal storage temperature of the second thermal accumulator 7; the thermal storage water supply unit 8 is connected to the third outlet end. The control module is specifically used to control the first heat storage unit 6 and the second heat storage unit 7 to release heat to the user end in sequence during the peak electricity period of the peak heating period.

[0020] In this invention, the deep geothermal well 1 may also include a medium-deep geothermal well.

[0021] refer to Figure 1As shown, after the deep geothermal well 1 extracts heat, the heat is exchanged through the heat exchanger 16. The temperature is judged at the temperature reversing device 5 to control the direction of the water flow. When the heat source temperature is ≥60℃, the temperature reversing device 5 controls the water flow to enter the first heat storage device 6 for heat storage; when 40℃≤heat source temperature<60℃, the temperature reversing device 5 controls the water flow to enter the second heat storage device 7 for heat storage; when the heat source temperature<40℃, the temperature reversing device 5 controls the water flow to enter the heat storage and water supply unit 8 for heat storage.

[0022] A twenty-second valve 39 is installed on the connecting pipe between the first outlet end of the temperature transducer 5 and the first heat accumulator 6. This valve controls the flow of water between the first outlet end of the temperature transducer 5 and the first heat accumulator 6. A twenty-third valve 40 is installed on the connecting pipe between the second outlet end of the temperature transducer 5 and the second heat accumulator 7. This valve controls the flow of water between the second outlet end of the temperature transducer 5 and the second heat accumulator 7. A twenty-fourth valve 41 is installed on the connecting pipe between the third outlet end of the temperature transducer 5 and the thermal storage water supply unit 8. This valve controls the flow of water between the third outlet end of the temperature transducer 5 and the thermal storage water supply unit 8. In practical applications, the thermal storage water supply unit 8 can be a low-temperature phase change heat accumulator.

[0023] Furthermore, the thermal storage heating unit also includes: The first heat pump 9 is connected to the second heat accumulator 7 and is used to heat the heat exchange fluid in the second heat accumulator 7. The secondary heat storage device 10 is connected to the first heat pump 9 on one side and to the user end on the other side. It is used to store the heat of the heat exchange fluid in the first heat pump 9 after it has been heated, and to provide heating to the user end during the peak heating period. The control module is connected to both the first heat pump 9 and the secondary heat storage unit 10, and is used to control the first heat pump 9 and the secondary heat storage unit 10 to work when the heat storage temperature in the second heat storage unit 7 is lower than the heating temperature and the current period is a low-electricity period.

[0024] When the heat stored in the second heat accumulator 7 remains unused for an extended period and fails to meet the heating temperature requirements, the control module uses temperature signals to control the opening and closing of the fourth valve 21 and the seventh valve 24 for secondary heat storage. For details, please refer to... Figure 1 As shown, when the time period is during off-peak electricity hours, the fourteenth valve 31, the second valve 19, the fourth valve 21, the seventh valve 24, the third valve 20, and the fifteenth valve 32 are opened, the fifth valve 22 and the sixth valve 23 are closed, and the first heat pump 9 is turned on to raise the temperature, and the heat is stored in the secondary heat storage tank 10.

[0025] When providing heating to users, during peak electricity and peak heat demand periods, the heat stored in the first heat storage tank 6 is first used to drive the circulation pump, open the twelfth valve 29 and the thirteenth valve 30, and close the fourteenth valve 31 and the fifteenth valve 32, and then use the user water distributor 12 and the user water collector 13 to provide heating to the heat users 14.

[0026] During peak electricity and heating periods, when the heat in the first heat storage tank 6 is completely released, the heat in the second heat storage tank 7 is used. The fourteenth valve 31 and the fifteenth valve 32 are opened, and the twelfth valve 29 and the thirteenth valve 30 are closed. The circulation pump is driven, and the user water distributor 12 and the user water collector 13 are used to supply heat to the heat user 14.

[0027] During peak electricity and heating periods, when the heat from the first heat storage unit 6 and the second heat storage unit 7 is fully released and the secondary heat storage unit 10 has completed its secondary heat storage, the secondary heat storage unit 10 drives the circulation pump to open the fifth valve 22 and the sixth valve 23, and close the fourth valve 21, the seventh valve 24, the twelfth valve 29, the thirteenth valve 30, the fourteenth valve 31, and the fifteenth valve 32, and uses the user water distributor 12 and the user water collector 13 to supply heat to the heat user 14.

[0028] Furthermore, the deep geothermal well 1 is connected to the user end via a pipeline; the temperature converter 5 is also used to detect the heat source temperature of the deep geothermal well 1. The control module is also used to control the deep geothermal well 1 to supply heat to the user end when the heat source temperature of the deep geothermal well 1 is greater than or equal to the heating temperature.

[0029] The system also includes: Shallow geothermal well 2 is connected to the user terminal and is used to provide geothermal energy; Thermometer 17 is used to detect the heat source temperature of shallow geothermal well 2; The control module is connected to the thermometer 17 and is used to control the shallow geothermal well 2 to supply heat to the user end when the heat source temperature of the shallow geothermal well 2 is greater than or equal to the heating temperature.

[0030] When the heat stored in the first heat storage tank 6, the second heat storage tank 7, and the secondary heat storage tank 10 is completely released, and there is still a heating demand, when the temperature reversing device 5 detects that the heat source temperature of the deep geothermal well 1 meets the heating temperature of 45℃, the first valve 18 is opened, and the deep geothermal well 1 directly supplies heat to the heat user 14.

[0031] When thermometer 17 detects that the heat source temperature of shallow geothermal well 2 meets the heating temperature of 45℃, the tenth valve 27 and the eleventh valve 28 are opened, and the eighth valve 25 and the ninth valve 26 are closed. The shallow geothermal well 2 directly supplies heat to the heat user 14 through the geothermal well distributor 3 and the geothermal well collector 4.

[0032] In this embodiment of the invention, the deep geothermal well 1 is connected to the first heat pump 9 via a pipeline; the first heat pump 9 is connected to the user terminal via a pipeline. The control module is also used to control the first heat pump 9 to heat the heat exchange fluid in the deep geothermal well 1 when the heat source temperature of the deep geothermal well 1 is lower than the heating temperature, and to use the heat of the heated heat exchange fluid to provide heating to the user end.

[0033] Furthermore, the system also includes: The second heat pump 11 is connected between the shallow geothermal well 2 and the user end; The control module is connected to the second heat pump 11 and is used to control the second heat pump 11 to heat the heat exchange fluid in the shallow geothermal well 2 when the heat source temperature of the shallow geothermal well 2 is lower than the heating temperature, and to use the heat of the heated heat exchange fluid to provide heating to the user end.

[0034] When the heat stored in the first heat storage tank 6, the second heat storage tank 7, and the secondary heat storage tank 10 is completely released, and the temperature reversing device 5 or the thermometer 17 detects that the current heat source temperature does not meet the heating temperature of 45°C, the hot water from the deep geothermal well 1 is introduced into the bypass pipe in the second heat storage tank 7. The twenty-third valve 40, the fourteenth valve 31, and the fifteenth valve 32 are opened, and the first heat pump 9 is used to raise the temperature. Then, the second valve 19 and the third valve 20 are opened, and the fourth valve 21, the fifth valve 22, the sixth valve 23, the seventh valve 24, the twelfth valve 29, and the thirteenth valve 30 are closed. The user water distributor 12 and the user water collector 13 are used to provide heat to the heat user 14. The tenth valve 27 and the eleventh valve 28 are opened, and the hot water from the shallow geothermal well 2 is heated by the second heat pump 11. Then, the user water distributor 12 and the user water collector 13 are used to provide heat to the heat user 14.

[0035] In this invention, the first heat accumulator 6 and the first heat pump 9 are connected by a pipe; The control module is also used to control the first heat pump 9 to heat the heat exchange fluid in the first heat storage tank 6, and to use the heat of the heated heat exchange fluid to provide heating to the user end.

[0036] When the heat load is high or the weather is extremely cold, the heat exchange fluid (water) in the first heat accumulator 6 can be further heated by the first heat pump 9 by opening the twelfth valve 29, the eighteenth valve 35, the nineteenth valve 36 and the thirteenth valve 30.

[0037] When the above-mentioned heating demand is met or during the non-heating season, the heat from the deep geothermal well 1 enters the thermal storage and water supply unit 8 for heat storage after passing through the heat exchanger 16 and the temperature converter 5. The thermal storage and water supply unit 8 is then connected to the domestic hot water pipeline for heat release.

[0038] The thermal storage and water supply unit 8 is connected to the first heat pump 9 via a pipeline; The control module is also used to control the first heat pump 9 to heat the heat exchange fluid in the heat storage and water supply unit 8, and to use the heat of the heated heat exchange fluid to supply water to the user.

[0039] When the user has a large demand for domestic hot water or a high required temperature, the heat exchange fluid (water) in the heat storage and water supply unit 8 can be further heated by the first heat pump 9 by opening the sixteenth valve 33, the twentieth valve 37, the twenty-first valve 38, and the seventeenth valve 34.

[0040] Shallow geothermal well 2 is connected to the thermal storage module and solar thermal module 15 via pipelines; The control module is also used to control the thermal storage module and the solar thermal module 15 to supplement heat to the shallow geothermal well 2 during off-peak electricity periods when heat demand is low.

[0041] During the non-heating season, after ensuring the supply of domestic hot water, valves 25 (eighth valve) and 26 (ninth valve) are opened to supplement the shallow geothermal well 2 with electricity during off-peak hours.

[0042] In winter, the solar thermal module 15 provides supplemental heat to the geothermal heating system; in summer, the solar thermal module 15 stores domestic hot water and provides supplemental heat to the shallow geothermal well 2.

[0043] The solar thermal module 15 collects heat and stores it in stages in the first accumulator 6, the second accumulator 7, and the thermal water supply unit 8 via the temperature converter 5. During the winter heating season, the heat, along with the heat from the deep geothermal well 1, is supplied to meet heating needs through the aforementioned control module. During non-heating seasons, valves 18, 19, 36, 20, 37, and 21 are opened to supply domestic water and supplemental heat from the shallow geothermal well 2 through the first accumulator 6, the second accumulator 7, and the thermal water supply unit 8.

[0044] This invention converts abundant summer solar energy resources into underground thermal energy reserves, forming a cross-seasonal energy storage system. This method not only effectively utilizes surplus renewable energy but also enhances the stability and efficiency of winter heating, achieving optimized energy allocation and seasonal regulation. To ensure efficient and stable system operation, the heat storage during the non-heating season should be reasonably matched to the heat load demand during the heating season, avoiding excessive fluctuations in soil and rock temperature to maintain the long-term efficient operation of the buried pipe heat exchanger.

[0045] Solar energy is intermittent and fluctuating, while geothermal energy provides stability. However, long-term geothermal heat extraction reduces the sustainability of the geothermal system, thus the two have a natural complementary relationship. Nevertheless, renewable energy systems are still insufficient in the face of unforeseen events such as significant load fluctuations or prolonged solar energy shortages. Introducing thermal storage modules can effectively regulate energy supply and demand, resolve imbalances, and thus improve the overall stability and reliability of the system. This system couples cross-seasonal geothermal energy storage, phase change thermal storage, and solar thermal utilization, and is deeply linked to electricity market price signals, forming a multi-energy collaborative control mechanism with geothermal energy at its core, efficiently meeting the diverse heat demands for heating and domestic hot water.

[0046] This invention proposes a geothermal heating system integrating electricity price response and thermal storage scheduling strategies. The system organically integrates deep geothermal, shallow geothermal, solar thermal, and thermal storage technologies, combined with heat pump technology and peak-valley electricity price regulation mechanisms, to construct a multi-energy coupled energy storage heating system encompassing cross-seasonal geothermal energy storage, phase change thermal storage, and solar thermal utilization. Through cascaded thermal energy storage and flexible utilization, the system can dynamically optimize heat output and deeply link with electricity market price signals, forming a multi-energy collaborative control mechanism with geothermal as the core, efficiently meeting the diverse heat demands for heating and domestic hot water. By fully leveraging the complementary advantages of geothermal and solar energy, it achieves the dual goals of optimizing energy supply costs and zero carbon emissions throughout the entire process.

[0047] The geothermal heating system provided by this invention integrates electricity price response and thermal storage scheduling strategies. This system integrates deep geothermal, shallow geothermal, solar thermal and thermal storage technologies to fully meet the diverse heating and hot water needs of office building users throughout the year. At the same time, it links with electricity market prices, establishes a temperature measurement and automatic control system, realizes intelligent operation of building energy systems, and reduces the operating costs of heating systems.

[0048] During the heating season, the system uses geothermal resources as the primary heat source to provide heating and domestic hot water. Relying on automatic control modules and temperature monitoring devices, it stores heat energy in stages during off-peak electricity hours and, combined with building energy consumption characteristics and real-time electricity price signals, achieves on-demand, tiered heat release for heating, linked to electricity prices. Simultaneously, it efficiently integrates solar energy resources and heat pump technology as auxiliary heat sources, significantly reducing the overall operating cost of the system while fully meeting energy needs.

[0049] During the non-heating season, the system uses solar thermal energy as the main heat source for domestic hot water supply and shallow geothermal supplementary heating. Relying on automatic control modules and temperature monitoring devices, the collected heat energy is stored in stages during off-peak electricity hours, and domestic hot water is flexibly provided according to actual needs. At the same time, combined with real-time electricity price signals, the shallow geothermal supplementary heating system is intelligently scheduled to achieve efficient energy utilization and economical operation.

[0050] The specific working principle of this invention is as follows: (1) Thermal storage module: Based on the electricity market price, during off-peak electricity / low heat demand periods, heat is extracted from deep geothermal well 1 and stored in stages through a temperature converter. During peak electricity / high heat demand periods, heat is released in stages or heated by a heat pump according to the system's heat demand characteristics to provide heat to the system.

[0051] (2) Cross-seasonal thermal energy storage system: In summer, when there is sufficient sunlight, thermal energy is collected through solar thermal module 15 and deep geothermal well 1, and thermal energy is stored in stages using a temperature converter. The heat stored in the thermal energy storage module can supplement the shallow geothermal well 2 and provide domestic hot water for users, realizing cross-seasonal thermal energy storage and high-value utilization of geothermal energy.

[0052] The present invention has the following advantages: (1) Multiple energy storage methods are coupled, enabling the system to achieve efficient energy utilization and flexible allocation. (2) Cross-seasonal thermal storage design effectively improves the high-value application of geothermal resources. (3) Cascaded thermal storage and auxiliary heat sources ensure the flexible and stable operation of the system under different operating conditions. (4) Deep integration of building energy consumption characteristics and real-time electricity price signals constructs a data-driven intelligent control strategy, empowering the intelligent operation of building energy systems. (5) While ensuring comfort, the system reduces the total operating cost throughout its life cycle.

[0053] In summary, this invention effectively utilizes renewable energy through innovative energy management technology, ensuring no curtailment of solar power and fully electrifying the equipment. The system significantly improves energy efficiency through cascaded thermal storage, cross-seasonal thermal storage, and solar thermal technology, essentially achieving the goal of providing heating and hot water from renewable energy sources, and providing reliable technical support for the sustainable use of green energy.

[0054] The above descriptions are merely a few embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any modifications or alterations made by those skilled in the art without departing from the scope of the technical solution of the present invention using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A geothermal heating system integrating electricity price response and thermal storage dispatch strategies, characterized in that, The system includes: Deep geothermal wells are used to provide geothermal energy. A solar thermal module is used to collect solar energy and convert it into heat energy; A temperature reversing device includes an inlet end and multiple outlet ends; the deep geothermal well and the photothermal module are both connected to the inlet end; the temperature reversing device is used to detect the temperature of the heat exchange fluid flowing into the inlet end and control the outflow direction of the heat exchange fluid according to the temperature of the heat exchange fluid. The thermal storage module includes a thermal storage heating unit and a thermal storage water supply unit connected to different outlets of the temperature converter. The thermal storage temperature of the thermal storage heating unit is greater than that of the thermal storage water supply unit. The thermal storage heating unit is used to provide heating to the user end, and the thermal storage water supply unit is used to supply water to the user end. The control module is connected to the deep geothermal well, the solar thermal module, the temperature converter, and the thermal storage module. It is used to control the deep geothermal well and the solar thermal module to store heat in the thermal storage module during off-peak electricity periods when heating demand is low, and to control the thermal storage module to release heat to the user during peak electricity periods when heating demand is high.

2. The system according to claim 1, characterized in that, The temperature commutator includes a first outlet end, a second outlet end, and a third outlet end; The thermal storage heating unit includes a first thermal accumulator connected to the first outlet end and a second thermal accumulator connected to the second outlet end; the thermal storage temperature of the first thermal accumulator is greater than the thermal storage temperature of the second thermal accumulator; the thermal storage water supply unit is connected to the third outlet end. The control module is specifically used to control the first heat storage device and the second heat storage device to release heat to the user terminal in sequence during peak electricity periods of peak heating season.

3. The system according to claim 2, characterized in that, The thermal storage and heating unit also includes: The first heat pump is connected to the second heat accumulator and is used to heat the heat exchange fluid in the second heat accumulator. A secondary heat storage device is connected to the first heat pump on one side and to the user terminal on the other side. It is used to store the heat of the heat exchange fluid after it is heated in the first heat pump and to provide heating to the user terminal during the peak heating period. The control module is connected to both the first heat pump and the secondary heat storage device, and is used to control the first heat pump and the secondary heat storage device to work when the heat storage temperature in the second heat storage device is lower than the heating temperature and the current period is a low-electricity period.

4. The system according to claim 3, characterized in that, The deep geothermal well is connected to the user terminal via a pipeline; the temperature converter is also used to detect the heat source temperature of the deep geothermal well; The control module is also used to control the deep geothermal well to supply heat to the user end when the heat source temperature of the deep geothermal well is greater than or equal to the heating temperature.

5. The system according to claim 4, characterized in that, The deep geothermal well is connected to the first heat pump via a pipeline; the first heat pump is connected to the user terminal via a pipeline. The control module is also used to control the first heat pump to heat the heat exchange fluid in the deep geothermal well when the heat source temperature of the deep geothermal well is lower than the heating temperature, and to use the heat of the heated heat exchange fluid to provide heating to the user end.

6. The system according to claim 1, characterized in that, The system also includes: A shallow geothermal well, connected to the user terminal, is used to provide geothermal energy; A thermometer is used to detect the heat source temperature of the shallow geothermal well; The control module is connected to the thermometer and is used to control the shallow geothermal well to supply heat to the user when the heat source temperature of the shallow geothermal well is greater than or equal to the heating temperature.

7. The system according to claim 6, characterized in that, The system also includes: A second heat pump is connected between the shallow geothermal well and the user terminal; The control module is connected to the second heat pump and is used to control the second heat pump to heat the heat exchange fluid in the shallow geothermal well when the heat source temperature of the shallow geothermal well is lower than the heating temperature, and to use the heat of the heated heat exchange fluid to provide heating to the user end.

8. The system according to claim 3, characterized in that, The first heat accumulator is connected to the first heat pump via a pipeline; The control module is also used to control the first heat pump to heat the heat exchange fluid in the first heat storage tank, and to use the heat of the heated heat exchange fluid to provide heating to the user end.

9. The system according to claim 3, characterized in that, The thermal storage and water supply unit is connected to the first heat pump via a pipeline; The control module is also used to control the first heat pump to heat the heat exchange fluid in the heat storage and water supply unit, and to use the heat of the heated heat exchange fluid to supply water to the user end.

10. The system according to claim 6, characterized in that, The shallow geothermal well is connected to the thermal storage module and the solar thermal module via pipelines; The control module is also used to control the thermal storage module and the solar thermal module to replenish heat to the shallow geothermal well during off-peak electricity periods when heat demand is low.

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