Underground aquifer energy storage and ground source heat pump coupling heating / refrigerating system and method

Abstract

The invention discloses an underground aquifer energy storage and ground source heat pump coupled heating / refrigerating system and method. The system comprises an underground aquifer energy storage subsystem which stores hot water through a heat storage aquifer so as to store heat energy, and stores cold water through a cold storage aquifer so as to store cold energy; the ground source heat pump subsystem is used for transmitting cold water / hot water between the heat storage aquifer / cold storage aquifer and the heat exchange unit through a transmission module; hot water / cold water and a circulating medium are subjected to heat exchange through the heat exchange unit, the circulating medium is subjected to heat exchange with air in the building facility after being heated and pressurized / cooled and depressurized so as to achieve heating / refrigerating, and circulating heating / refrigerating is achieved through circulating heat exchange of the circulating medium. By means of layered energy storage of the underground aquifer and coupling of the underground aquifer and the ground source heat pump, the problem that energy of a traditional ground source heat pump is unbalanced is solved, the problem that energy accumulation is generated in the operation process of a traditional ground source heat pump system is effectively solved, the operation efficiency of the system is improved, and the operation service life of the system is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of geothermal resource utilization, and more specifically, relates to a heating / cooling system and method for coupling underground aquifer energy storage and ground source heat pump. Background Art

[0002] Ground source heat pump is a renewable energy utilization technology that uses underground heat energy for building heating and cooling. It has the advantages of high efficiency and energy saving, significant environmental benefits, and renewable utilization. The basic principle of the ground source heat pump system is to use the constant temperature of underground soil or groundwater as a heat exchange medium, exchange heat with it through buried pipes, and use the heat pump cycle to achieve heat transfer. In the operation of traditional ground source heat pump systems, due to the limited energy absorption capacity of underground soil / groundwater, the imbalance between long-term cooling and heating time will lead to underground energy accumulation, and the shallow surface of the facility will be unbalanced due to the imbalance of cold and hot use, resulting in cold or hot underground energy storage. In areas with large cooling capacity all year round, the underground energy storage temperature is high; in areas with high heating utilization, the energy storage temperature is low, resulting in a small temperature difference in the system, reduced heat exchange efficiency, and thus reduced equipment efficiency, while affecting the surrounding ecological structure. If this problem cannot be solved, the operating efficiency of the ground source heat pump system will decrease year by year, and the operating and maintenance costs of the system will increase year by year.

[0003] Therefore, it is urgent to solve the problem of energy imbalance in traditional ground-source heat pumps and effectively improve the underground energy accumulation phenomenon in order to improve the system operating efficiency and extend the system operating life.

[0004] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to propose a heating / cooling system and method for coupling underground aquifer energy storage and ground source heat pump, so as to realize the mutual cooperation between energy supply and energy storage system, meet the cold and hot load balance requirements of the system for the purpose of cooling and heating, effectively improve the problem of energy accumulation in the operation process of traditional ground source heat pump system, improve the system operation efficiency, and extend the system operation life.

[0006] To achieve the above objectives, the present invention proposes a heating / cooling system and method for coupling underground aquifer energy storage and ground source heat pump.

[0007] According to a first aspect of the present invention, a heating / cooling system coupling underground aquifer energy storage and ground source heat pump is proposed, comprising:

[0008] Underground aquifer energy storage subsystem, including:

[0009] Thermal aquifers for storing hot water and thus thermal energy, as well as cold water for heat exchange in the ground source heat pump subsystem;

[0010] A cold storage aquifer, disposed above the heat storage aquifer, for storing the cold water and thus cold energy, and the hot water that completes heat exchange in the ground source heat pump subsystem;

[0011] Ground source heat pump subsystem, including:

[0012] A transmission module, used for transmitting the hot water / cold water stored in the heat storage aquifer / cold storage aquifer to a heat exchange unit; transmitting the hot water / cold water that has completed heat exchange in the heat exchange unit to the cold storage aquifer / heat storage aquifer;

[0013] The heat exchange unit is used to perform heat exchange between the hot water / the cold water and a circulating medium. After the circulating medium that has completed the heat exchange is heated and pressurized / cooled and depressurized, it performs heat exchange with the air in the building facility to achieve heating / cooling; after the circulating medium that has completed the heat exchange with the air is cooled and depressurized / heated and pressurized, it performs heat exchange with the hot water / the cold water again to achieve cyclic heating / cooling.

[0014] Optionally, the transmission module includes:

[0015] A hot water transmission module is used to transmit the hot water stored in the thermal storage aquifer to the heat exchange unit for heat exchange; and to transmit the cold water that has completed heat exchange in the heat exchange unit to the thermal storage aquifer for storage;

[0016] The cold water transmission module is used to transmit the cold water stored in the cold storage aquifer to the heat exchange unit for heat exchange; and transmit the hot water that has completed heat exchange in the heat exchange unit to the cold storage aquifer for storage.

[0017] Optionally, the heat exchange unit comprises:

[0018] The first heat exchange module is used to perform heat exchange between the hot water and the circulating medium, and input the circulating medium that has completed the heat exchange into the temperature and pressure increasing module; and perform heat exchange between the circulating medium output from the temperature and pressure decreasing module and the air in the building facility;

[0019] A second heat exchange module is used to perform heat exchange between the cold water and the circulating medium, and input the circulating medium that has completed the heat exchange into the temperature reduction and pressure reduction module; and perform heat exchange between the circulating medium of the temperature increase and pressure increase module and the air in the building facility;

[0020] A temperature and pressure increasing module, used to increase the temperature and pressure of the circulating medium that has completed heat exchange with the hot water and then input it into the second heat exchange module for heating; and to increase the temperature and pressure of the circulating medium that has completed heat exchange with the air in the building facility in the second heat exchange module and then input it into the first heat exchange module for heat exchange with the hot water;

[0021] The temperature and pressure reduction module is used to reduce the temperature and pressure of the circulating medium that has completed heat exchange with the cold water and then input it into the first heat exchange module for refrigeration; and to reduce the temperature and pressure of the circulating medium that has completed heat exchange with the air in the building facility in the first heat exchange module and then input it into the second heat exchange module for heat exchange with the cold water.

[0022] Optionally, the system includes a heating cycle mode and a cooling cycle mode;

[0023] In the heating cycle mode, the hot water stored in the thermal storage aquifer is transmitted to the first heat exchange module through the hot water transmission module to exchange heat with the circulating medium, the hot water that has completed the heat exchange is transmitted to the cold aquifer through the cold water transmission module for storage, the circulating medium that has completed the heat exchange is input into the temperature increase and pressure increase module for temperature increase and pressure increase, and then input into the second heat exchange module for heat exchange with the air in the building facility to achieve heating; the circulating medium that has completed the heat exchange with the air in the building facility is input into the temperature decrease and pressure decrease module for temperature decrease and pressure decrease, and then input into the first heat exchange module to achieve circulation heating;

[0024] In the refrigeration cycle mode, the cold water stored in the cold storage aquifer is transferred to the second heat exchange module through the cold water transfer module to exchange heat with the circulating medium, the cold water that has completed the heat exchange is transferred to the hot aquifer through the hot water transfer module for storage, the circulating medium that has completed the heat exchange is input into the temperature reduction and pressure reduction module for temperature reduction and pressure reduction, and then input into the first heat exchange module for heat exchange with the air in the building facility to achieve refrigeration; the circulating medium that has completed the heat exchange with the air in the building facility is input into the temperature increase and pressure increase module for temperature increase and pressure increase, and then input into the second heat exchange module to achieve cyclic refrigeration.

[0025] Optionally, the first input end of the hot water transmission module is arranged in the heat storage aquifer, the first output end of the hot water transmission module is connected to the input end of the first heat exchange module, the first circulating medium output end of the first heat exchange module is connected to the first input end of the temperature increasing and pressure increasing module, the first output end of the temperature increasing and pressure increasing module is connected to the second circulating medium input end of the second heat exchange module, the second circulating medium output end of the second heat exchange module is connected to the second input end of the temperature decreasing and pressure decreasing module, the second output end of the temperature decreasing and pressure decreasing module is connected to the first circulating medium input end of the first heat exchange module, the output end of the first heat exchange module is connected to the second input end of the cold water transmission module, and the second output end of the cold water transmission module is arranged in the cold storage aquifer;

[0026] All of the input ends and the output ends are turned on in the heating cycle mode and turned off in the cooling cycle mode.

[0027] Optionally, the first input end of the cold water transmission module is arranged in the cold storage aquifer, the first output end of the cold water transmission module is connected to the input end of the second heat exchange module, the first circulating medium output end of the second heat exchange module is connected to the first input end of the temperature reduction and pressure reduction module, the first output end of the temperature reduction and pressure reduction module is connected to the second circulating medium input end of the first heat exchange module, the second circulating medium output end of the first heat exchange module is connected to the second input end of the temperature increase and pressure increase module, the second output end of the temperature increase and pressure increase module is connected to the first circulating medium input end of the second heat exchange module, the output end of the second heat exchange module is connected to the second input end of the cold water transmission module, and the second output end of the cold water transmission module is arranged in the cold storage aquifer;

[0028] All of the input ends and the output ends are turned on in the refrigeration cycle mode and turned off in the heating cycle mode.

[0029] Optionally, it also includes:

[0030] The hot water extraction module is used to extract the hot water stored in the heat storage aquifer to the hot water transmission module through the hot water extraction module in the heating cycle mode, and then transmit it to the first heat exchange module.

[0031] Optionally, it also includes:

[0032] The cold water extraction module is used to extract the cold water stored in the cold storage aquifer through the cold water extraction module to the cold water transmission module in the refrigeration cycle mode, and then transmit it to the second heat exchange module.

[0033] Optionally, it also includes:

[0034] An isolation layer having low permeability and low thermal conductivity, the isolation layer comprising:

[0035] a first isolation layer, used to isolate the heat storage aquifer from the stratum below it;

[0036] a second isolation layer, used to isolate the heat storage aquifer from the cold storage aquifer above it;

[0037] The third isolation layer is used to isolate the cold storage aquifer from the ground surface.

[0038] According to a second aspect of the present invention, a method for heating / cooling by coupling underground aquifer energy storage with a ground source heat pump is proposed, comprising:

[0039] The heat storage aquifer of the underground aquifer energy storage subsystem stores hot water and thus stores thermal energy, as well as cold water stored in the ground source heat pump subsystem to complete heat exchange;

[0040] The cold water is stored in a cold storage aquifer disposed above the heat storage aquifer, thereby storing cold energy, and the hot water that is heat exchanged in the ground source heat pump subsystem is stored;

[0041] The hot water / cold water stored in the heat storage aquifer / cold storage aquifer is transmitted to the heat exchange unit of the geothermal heat pump subsystem through the transmission module of the geothermal heat pump subsystem; the hot water / cold water that has completed heat exchange in the heat exchange unit is transmitted to the cold storage aquifer / the heat storage aquifer;

[0042] The hot water / cold water is heat exchanged with a circulating medium through the heat exchange unit, and the circulating medium that has completed the heat exchange is heated and pressurized / cooled and depressurized before exchanging heat with the air in the building facility to achieve heating / cooling; the circulating medium that has completed the heat exchange with the air is cooled and depressurized / heated and pressurized before exchanging heat with the hot water / cold water again to achieve cyclic heating / cooling.

[0043] The beneficial effects of the present invention are as follows: through the stratified energy storage of the underground aquifer and coupling with the ground source heat pump, during heating, the hot water stored in the heat storage aquifer is heat exchanged with the circulating medium of the ground source heat pump for heating, and the hot water that has completed the heat exchange is cooled and reduced in pressure and then input into the cold storage aquifer for storage to store cold energy; during cooling, the cold water stored in the cold storage aquifer is heat exchanged with the circulating medium of the ground source heat pump for cooling, and the cold water that has completed the heat exchange is heated and increased in pressure and then input into the heat storage aquifer for storage to store heat energy; the present invention realizes the mutual cooperation of the energy supply and energy storage systems, meets the cold and hot load balance requirements of the system for the purpose of cooling and heating, solves the problem of energy imbalance of traditional ground source heat pumps, effectively improves the problem of energy accumulation generated during the operation of traditional ground source heat pump systems, improves the system operation efficiency, and extends the system operation life.

[0044] The system of the present invention has other characteristics and advantages, which will be apparent from the drawings incorporated herein and the following detailed description, or will be described in detail in the drawings incorporated herein and the following detailed description, which together serve to explain the specific principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, in which like reference numerals generally represent like components.

[0046] Figure 1 A schematic diagram of a heating / cooling system coupling underground aquifer energy storage and ground source heat pump according to the present invention is shown.

[0047] Figure 2 A schematic diagram of a heating / cooling system coupling underground aquifer energy storage and ground source heat pump according to Example 1 of the present invention is shown.

[0048] Figure 3 A flow chart showing the steps of a method for coupling underground aquifer energy storage and ground source heat pump heating / cooling according to Example 2 of the present invention.

[0049] Reference numerals:

[0050] 1. Hot well, 2. Cold well, 3. Insulation material, 4. Shallow aquifer, 5. Deep aquifer, 6. Isolation layer, 7. Circulating medium, 8. Evaporator, 9. Condenser, 10. Expansion valve, 11. Compressor, 12. Building facilities, 13. Heating cycle, 14. Refrigeration cycle. DETAILED DESCRIPTION

[0051] The present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0052] like Figure 1 As shown, a heating / cooling system coupled with underground aquifer energy storage and ground source heat pump according to the present invention comprises:

[0053] Underground aquifer energy storage subsystem, including:

[0054] Thermal aquifers for storing hot water and thus thermal energy, as well as cold water for heat exchange in the ground source heat pump subsystem;

[0055] The cold storage aquifer is arranged above the heat storage aquifer and is used to store cold water and thus cold energy, as well as hot water for heat exchange in the ground source heat pump subsystem;

[0056] Ground source heat pump subsystem, including:

[0057] A transmission module is used to transmit the hot water / cold water stored in the thermal storage aquifer / cold storage aquifer to the heat exchange unit; and to transmit the hot water / cold water that has completed heat exchange in the heat exchange unit to the thermal storage aquifer / cold storage aquifer;

[0058] The heat exchange unit is used to perform heat exchange between hot water / cold water and a circulating medium. After the circulating medium that has completed the heat exchange is heated and pressurized / cooled and depressurized, it exchanges heat with the air in the building facility to achieve heating / cooling; after the circulating medium that has completed the heat exchange with the air is cooled and depressurized / heated and pressurized, it exchanges heat with hot water / cold water again to achieve circulating heating / cooling.

[0059] Specifically, the present invention stores hot water in a layer of underground aquifer to store thermal energy, stores cold water in a layer of underground aquifer to store cold energy, and forms an underground aquifer energy storage and ground source heat pump coupled heating / cooling system with a ground source heat pump system. The system is used to heat / cool building facilities to solve the energy imbalance problem of traditional ground source heat pump systems, effectively improve the underground energy accumulation phenomenon, improve the operating efficiency of the ground source heat pump system, and extend the operating life of the ground source heat pump system. The system of the present invention includes an underground aquifer energy storage subsystem and a ground source heat pump subsystem, and the aquifer energy storage subsystem includes a heat storage aquifer and a cold storage aquifer. Hot water is stored in the heat storage aquifer to store thermal energy, and cold water is stored in the cold storage aquifer to store cold energy. The heat storage aquifer The aquifer is placed below the cold storage aquifer, that is, the heat storage aquifer is in a deeper stratum, which is conducive to maintaining the temperature of hot water; the two are isolated by an isolation layer composed of materials with low permeability and low thermal conductivity to prevent the cold storage aquifer from penetrating into the heat storage aquifer, and also to prevent heat exchange between the two; the ground source heat pump subsystem includes a transmission module and a heat exchange unit. During heating, the hot water stored in the heat storage aquifer is pressurized and transmitted to the first heat exchange module of the heat exchange unit through the transmission unit for heat exchange with the circulating medium in the heat exchange unit to obtain heated circulating medium and cooled hot water, and then the cooled hot water is cooled and depressurized by the cooling and depressurization module in the heat exchange unit to obtain cold water, which is then transported to the cold storage aquifer through the transmission module for storage. The heat exchanger heats up the indoor air and heats the indoor air, and then heats the indoor air. The indoor air is then heated and heated by the heated and heated circulating medium. The indoor air is then heated by the heated and heated circulating medium. The indoor air is then heated by the heated and heated circulating medium. The indoor air is then heated by the heated and heated circulating medium. The indoor air is then heated by the heated and heated circulating medium. The indoor air is then heated by the heated and heated circulating medium. The indoor air is then heated by the heated and heated circulating medium. The indoor air is then heated by the heated and heated circulating medium. The hot water is transported to the heat storage aquifer for storage through the transmission module to store thermal energy; the cooled circulating medium is cooled and depressurized by the cooling and depressurizing module in the heat exchange unit and then transported to the first heat exchange module for heat exchange with the air in the building facility; the indoor air is cooled by the cooled and depressurized circulating medium, thereby refrigerating the building facility; the circulating medium that has completed the heat exchange is then transported to the second heat exchange module for heat exchange with the cold water transported by the transmission device, thereby achieving the purpose of circulating refrigeration; the present application can also set a control module to control the opening / closing of cooling / heating, the opening / closing of valves in the control link, etc., and set sensors to cooperate with the control module to control the heating / cooling process, such as temperature sensors, pressure sensors and flow sensors.

[0060] In one example, the transmission module includes:

[0061] The hot water transmission module is used to transmit the hot water stored in the thermal storage aquifer to the heat exchange unit for heat exchange; and to transmit the cold water that has completed the heat exchange in the heat exchange unit to the thermal storage aquifer for storage;

[0062] The cold water transmission module is used to transmit the cold water stored in the cold storage aquifer to the heat exchange unit for heat exchange; and transmit the hot water that has completed heat exchange in the heat exchange unit to the cold storage aquifer for storage.

[0063] Specifically, the transmission module includes a hot water transmission module and a cold water transmission module. The hot water transmission module is used to transmit the hot water stored in the heat storage aquifer to the heat exchange unit for heat exchange with the circulating medium during heating, and to transmit the cold water transported from the cold storage aquifer to the heat exchange unit to the heat storage aquifer for storage after the heat exchange is completed during cooling; the cold water transmission module is used to transmit the cold water stored in the cold storage aquifer to the heat exchange unit for heat exchange with the circulating medium during cooling, and to transmit the hot water transported from the heat storage aquifer to the heat exchange unit to the cold storage aquifer for storage after the heat exchange is completed during heating.

[0064] For example, a well can be drilled from the ground to connect to the heat storage aquifer, and the heat storage aquifer and the heat exchange unit are connected through the well. This well is a hot water transmission module; another well can be drilled from the ground to connect to the cold storage aquifer, and the cold storage aquifer and the heat exchange unit are connected through the well. This well is a cold water transmission module; or pipelines connecting the heat exchange unit to the heat storage aquifer and the cold storage aquifer can be buried separately, and hot water and cold water can be transmitted respectively through the pipelines.

[0065] In one example, the heat exchange unit includes:

[0066] The first heat exchange module is used to perform heat exchange between hot water and circulating medium, and input the circulating medium that has completed heat exchange into the temperature and pressure increasing module; and perform heat exchange between the circulating medium output from the temperature and pressure decreasing module and the air in the building facility;

[0067] The second heat exchange module is used to perform heat exchange between cold water and the circulating medium, and input the circulating medium that has completed the heat exchange into the temperature reduction and pressure reduction module; and perform heat exchange between the circulating medium of the temperature increase and pressure increase module and the air in the building facility;

[0068] The temperature and pressure increasing module is used to increase the temperature and pressure of the circulating medium that has completed the heat exchange with the hot water and then input it into the second heat exchange module for heating; the temperature and pressure of the circulating medium that has completed the heat exchange with the air in the building facility in the second heat exchange module is increased and then input into the first heat exchange module for heat exchange with the hot water;

[0069] The temperature and pressure reduction module is used to reduce the temperature and pressure of the circulating medium that has completed heat exchange with cold water and then input it into the first heat exchange module for refrigeration; the circulating medium that has completed heat exchange with the air in the building facility in the first heat exchange module is cooled and pressure reduced and then input into the second heat exchange module for heat exchange with cold water.

[0070] Specifically, the heat exchange unit includes a first heat exchange module, a second heat exchange module, a temperature increase and pressure increase module, and a temperature decrease and pressure decrease module; during heating, the hot water is heat exchanged with the circulating medium through the first heat exchange module to obtain a heated circulating medium, and then the heated circulating medium is input into the temperature increase and pressure increase module for temperature increase and pressure increase, and then input into the second heat exchange module for heat exchange with the air in the building facility to heat the air in the building facility to achieve heating, and the circulating medium that has completed the heat exchange is cooled and depressurized by the temperature decrease and pressure decrease module and then discharged into the first heat exchange module to start the next heating cycle; during cooling, the cold water is heat exchanged with the circulating medium through the second heat exchange module to obtain a cooled circulating medium, and then the cooled circulating medium is input into the temperature decrease and pressure decrease module for temperature decrease and pressure decrease, and then input into the first heat exchange module for heat exchange with the air in the building facility to cool the air in the building facility to achieve cooling, and the circulating medium that has completed the heat exchange is heated and depressurized by the temperature increase and pressure increase module and then discharged into the second heat exchange module to start the next cooling cycle;

[0071] For example, the first heat exchange module adopts an evaporator, the second heat exchange module adopts a condenser, the heating and pressure increasing module adopts a compressor, and the cooling and pressure reducing module adopts an expansion valve. During heating, hot water exchanges heat with the circulating medium in the evaporator. After the circulating medium absorbs the heat of the hot water, it is pressurized and heated by the compressor and discharged into the condenser. The high-temperature circulating medium absorbs the cold air in the building facilities to achieve heating; the circulating medium after absorbing cold is discharged into the evaporator after being reduced in pressure and cooled by the expansion valve to start the next heating cycle; during cooling, cold water exchanges heat with the circulating medium in the condenser. After the circulating medium absorbs the cold water, it is reduced in pressure and cooled by the expansion valve and discharged into the evaporator. The low-temperature circulating medium absorbs the heat in the air in the building facilities to achieve cooling. The circulating medium after absorbing heat is pressurized and heated by the compressor and discharged into the condenser to start the next refrigeration cycle.

[0072] In one example, the system includes a heating cycle mode and a cooling cycle mode;

[0073] In the heating cycle mode, the hot water stored in the thermal storage aquifer is transmitted to the first heat exchange module through the hot water transmission module to exchange heat with the circulating medium, the hot water that has completed the heat exchange is transmitted to the cold aquifer through the cold water transmission module for storage, the circulating medium that has completed the heat exchange is input to the temperature increase and pressure increase module for temperature increase and pressure increase, and then input to the second heat exchange module for heat exchange with the air in the building facility to achieve heating; the circulating medium that has completed the heat exchange with the air in the building facility is input to the temperature decrease and pressure decrease module for temperature decrease and pressure decrease, and then input to the first heat exchange module to achieve cycle heating;

[0074] In the refrigeration cycle mode, the cold water stored in the cold storage aquifer is transferred to the second heat exchange module through the cold water transfer module to exchange heat with the circulating medium; the cold water that has completed the heat exchange is transferred to the hot aquifer through the hot water transfer module for storage; the circulating medium that has completed the heat exchange is input into the temperature reduction and pressure reduction module for temperature reduction and pressure reduction, and then input into the first heat exchange module for heat exchange with the air in the building facility to achieve refrigeration; the circulating medium that has completed the heat exchange with the air in the building facility is input into the temperature increase and pressure increase module for temperature increase and pressure increase, and then input into the second heat exchange module to achieve circulation refrigeration.

[0075] Specifically, the system of the present invention has two working modes, one is a heating cycle mode, and the other is a refrigeration cycle mode; in the heating cycle mode, the hot water stored in the heat storage aquifer is transmitted to the first heat exchange module through the hot water transmission module to exchange heat with the circulating medium, and the hot water absorbs the cold of the circulating medium and is discharged into the cold storage aquifer for storage through the cold water transmission module to achieve cold storage; the circulating medium absorbs the heat of the hot water and is heated and pressurized by the temperature rising and pressure rising module and is then discharged into the second heat exchange module to exchange heat with the air in the building facility, heating the air to achieve heating, and the heated and pressurized circulating medium absorbs the cold in the air and is cooled and depressurized by the temperature falling and pressure falling module and is then discharged into the first heat exchange module The module then exchanges heat with hot water to achieve circulating heating; in the refrigeration cycle mode, the cold water stored in the cold storage aquifer is transmitted to the second heat exchange module through the cold water transmission module to exchange heat with the circulating medium, and the cold water absorbs the heat of the circulating medium and is discharged into the heat storage aquifer for storage through the hot water transmission module to achieve heat storage; after the circulating medium absorbs the coldness of the cold water, it is cooled and depressurized by the cooling and depressurizing module and then discharged into the first heat exchange module to exchange heat with the air in the building facility to cool the air to achieve refrigeration, and the cooled and depressurized circulating medium absorbs the heat in the air and is heated and pressurized by the heating and pressure increasing module and then discharged into the second heat exchange module to exchange heat with the cold water to achieve circulating refrigeration.

[0076] In one example, a first input end of a hot water transmission module is disposed in a thermal storage aquifer, a first output end of the hot water transmission module is connected to an input end of a first heat exchange module, a first circulating medium output end of the first heat exchange module is connected to a first input end of a temperature and pressure increasing module, a first output end of the temperature and pressure increasing module is connected to a second circulating medium input end of a second heat exchange module, a second circulating medium output end of the second heat exchange module is connected to a second input end of a temperature and pressure decreasing module, a second output end of the temperature and pressure decreasing module is connected to a first circulating medium input end of the first heat exchange module, an output end of the first heat exchange module is connected to a second input end of a cold water transmission module, and a second output end of the cold water transmission module is disposed in a cold storage aquifer;

[0077] All the above inputs and outputs are turned on in heating cycle mode and turned off in cooling cycle mode.

[0078] Specifically, in the heating cycle mode, the first input end of the hot water transmission module is connected to the heat storage aquifer, and the first output end thereof is connected to the input end of the first heat exchange module, so that the hot water of the heat storage aquifer is transported to the first heat exchange module through the hot water transmission module; the first circulating medium output end of the first heat exchange module is connected to the first input end of the temperature increasing and pressure increasing module, so that the circulating medium that has completed the heat exchange is transported to the temperature increasing and pressure increasing module for temperature increasing and pressure increasing; the first output end of the temperature increasing and pressure increasing module is connected to the second circulating medium input end of the second heat exchange module, so that the circulating medium that has completed the heat exchange is input to the second heat exchange module for heat exchange with the air in the building facility; the second circulating medium output end of the second heat exchange module is connected to the first input end of the temperature decreasing and pressure increasing module The second input end of the pressure reduction module is connected to the second input end of the heat exchange module, and the circulating medium that has completed the heat exchange is transported to the cooling and pressure reduction module for cooling and pressure reduction; the second output end of the cooling and pressure reduction module is connected to the first circulating medium input end of the first heat exchange module, and the cooling and pressure reduction circulating medium is transported to the first heat exchange module for heat exchange with hot water again; the output end of the first heat exchange module is connected to the second input end of the cold water transmission module, and the second output end of the cold water transmission module is connected to the cold storage aquifer, and the hot water that has completed the heat exchange in the first heat exchange module is transmitted to the cold storage aquifer through the cold water transmission module for storage, so as to store cold energy; in this heating cycle mode, the other input ends and output ends of each module are in a closed state to avoid affecting the circulating heating.

[0079] In one example, the first input end of the cold water transmission module is arranged in the cold storage aquifer, the first output end of the cold water transmission module is connected to the input end of the second heat exchange module, the first circulating medium output end of the second heat exchange module is connected to the first input end of the temperature reduction and pressure reduction module, the first output end of the temperature reduction and pressure reduction module is connected to the second circulating medium input end of the first heat exchange module, the second circulating medium output end of the first heat exchange module is connected to the second input end of the temperature increase and pressure increase module, the second output end of the temperature increase and pressure increase module is connected to the first circulating medium input end of the second heat exchange module, the output end of the second heat exchange module is connected to the second input end of the cold water transmission module, and the second output end of the cold water transmission module is arranged in the cold storage aquifer;

[0080] All the above inputs and outputs are turned on in cooling cycle mode and turned off in heating cycle mode.

[0081] Specifically, in the refrigeration cycle mode, the first input end of the cold water transmission module is connected to the cold storage aquifer, and the first output end thereof is connected to the input end of the second heat exchange module, so that the cold water of the cold storage aquifer is transported to the second heat exchange module through the cold water transmission module; the first circulating medium output end of the second heat exchange module is connected to the first input end of the cooling and decompression module, so that the circulating medium that has completed the heat exchange is transported to the cooling and decompression module for cooling and decompression; the first output end of the cooling and decompression module is connected to the second circulating medium input end of the first heat exchange module, so that the circulating medium after cooling and decompression is input into the first heat exchange module for heat exchange with the air in the building facility; the second circulating medium output end of the first heat exchange module is connected to the heating and heating module The second input end of the high-pressure module is connected to the second input end of the high-pressure module, and the circulating medium that has completed the heat exchange is transported to the temperature-raising and pressure-raising module for temperature-raising and pressure-raising; the second output end of the temperature-raising and pressure-raising module is connected to the first circulating medium input end of the second heat exchange module, and the circulating medium with the increased temperature and pressure is transported to the second heat exchange module for heat exchange with cold water again; the output end of the second heat exchange module is connected to the second input end of the hot water transmission module, and the second output end of the hot water transmission module is connected to the heat storage aquifer, and the cold water that has completed the heat exchange in the second heat exchange module is transmitted to the heat storage aquifer through the hot water transmission module for storage, so as to store thermal energy; in this refrigeration cycle mode, the other input ends and output ends of each module are in a closed state to avoid affecting the cyclic refrigeration.

[0082] In one example, it also includes:

[0083] The hot water extraction module is used to extract the hot water stored in the heat storage aquifer to the hot water transmission module through the hot water extraction module in the heating cycle mode, and then transmit it to the first heat exchange module.

[0084] Specifically, in the heating cycle mode, the system of the present invention extracts hot water stored in the thermal storage aquifer through a hot water extraction module, for example, by extracting hot water through a submersible pump, a deep well pump, a self-priming pump or a water pump, and the extracted hot water is transported to the first heat exchange module through a hot water transmission module.

[0085] In one example, it also includes:

[0086] The cold water extraction module is used to extract the cold water stored in the cold storage aquifer to the cold water transmission module through the cold water extraction module in the refrigeration cycle mode, and then transmit it to the second heat exchange module.

[0087] Specifically, in the refrigeration cycle mode, the system of the present invention extracts cold water stored in the cold storage aquifer through a cold water extraction module, for example, by extracting cold water through a submersible pump, a deep well pump, a self-priming pump or a water pump, and the extracted hot and cold water is transported to the first heat exchange module through a cold water transmission module.

[0088] In one example, it also includes:

[0089] The isolation layer has low permeability and low thermal conductivity. The isolation layer includes:

[0090] a first isolation layer for isolating the thermal storage aquifer from the stratum below it;

[0091] A second isolation layer for isolating the heat storage aquifer from the cold storage aquifer above it;

[0092] The third isolation layer is used to isolate the cold storage aquifer from the ground surface.

[0093] Specifically, the heat storage aquifer and the cold storage aquifer of the present invention are isolated by an isolation layer, and the isolation layer has low permeability and low thermal conductivity to prevent the occurrence of infiltration, heat exchange and the like; from top to bottom, they are the first isolation layer, the cold storage aquifer, the second isolation layer, the heat storage aquifer, and the third isolation layer; the cold storage aquifer is isolated from the ground surface by the first isolation layer to prevent the water on the ground surface from infiltrating into the cold storage aquifer, and to prevent the cold water in the cold storage aquifer from exchanging heat with the water and air on the ground surface, causing the temperature to rise; the second isolation layer isolates the cold storage aquifer from the heat storage aquifer to prevent the occurrence of infiltration, heat exchange and the like between the two, resulting in the inability to store heat / cold or a reduction in the heat / cold storage effect; the second isolation layer isolates the heat storage aquifer from the stratum below it to prevent hot water from infiltrating into the stratum below or exchanging heat with the stratum below, causing heat loss.

[0094] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but is not intended to be limiting of the present invention. It should be noted that the embodiments and features in the embodiments of the present invention may be combined with each other without conflict.

[0095] Example 1

[0096] like Figure 2 As shown, this embodiment provides a heating / cooling system coupling underground aquifer energy storage and ground source heat pump, including:

[0097] Hot well 1, cold well 2, insulation material 3, shallow aquifer 4, deep aquifer 5, isolation layer 6, circulating working medium 7, evaporator 8, condenser 9, expansion valve 10, compressor 11, building facilities 12, heating cycle 13, refrigeration cycle 14.

[0098] The walls of the hot well 1 and the cold well 2 need to be covered with insulation material 3 to prevent heat or cold from being lost during transportation in the well; the isolation layer 6 needs to have low permeability and low thermal conductivity.

[0099] During the winter heating cycle 13, the hot well 1 extracts hot water from the deep aquifer 5 through a submersible pump. The extracted hot water exchanges heat with the circulating medium 7 in the evaporator 8. After the hot water absorbs the cold of the circulating medium 7, it is injected into the shallow aquifer 4 through the cold well 2 to achieve cold storage. After the circulating medium 7 absorbs the heat of the hot water, it is pressurized and heated by the compressor 11 and discharged into the condenser 9. The high-temperature circulating medium 7 absorbs the cold in the air of the building facilities 12 to achieve heating; the circulating medium 7 after absorbing the cold is depressurized and cooled by the expansion valve 10 and discharged into the evaporator 8 to start the next heating cycle 13.

[0100] During the summer refrigeration cycle 14, the cold well 2 extracts cold water from the shallow aquifer 4 through a submersible pump. The extracted cold water exchanges heat with the circulating working medium 7 in the condenser 9. After the cold water absorbs the heat of the circulating working medium 7, it is injected into the deep aquifer 5 through the hot well to achieve heat storage. After the circulating working medium 7 absorbs the coldness of the cold water, it is reduced in pressure and temperature by the expansion valve 10 and discharged into the evaporator 8. The low-temperature circulating working medium 7 absorbs the heat in the air of the building facilities 12 to achieve refrigeration; the circulating working medium 7 after absorbing heat is pressurized and heated by the compressor 11 and discharged into the condenser 9 to start the next refrigeration cycle 14.

[0101] During project planning and design, the selection of shallow aquifers and deep aquifers, and the type, quantity, and arrangement of hot and cold wells need to be designed based on the heating and cooling load requirements of the building facilities. When a single well cannot meet the heating or cooling needs, other hot or cold wells are required to provide energy.

[0102] Example 2

[0103] like Figure 3 As shown, this embodiment provides a method for coupling heating / cooling of underground aquifer energy storage and ground source heat pump, which is applied to the underground aquifer energy storage and ground source heat pump coupling heating / cooling system of Example 1, including:

[0104] The heat storage aquifer of the underground aquifer energy storage subsystem stores hot water and thus stores heat energy, and stores cold water for heat exchange in the ground source heat pump subsystem; the cold storage aquifer located above the heat storage aquifer stores cold water and thus stores cold energy, and stores hot water for heat exchange in the ground source heat pump subsystem;

[0105] The hot water / cold water stored in the heat storage aquifer / cold storage aquifer is transmitted to the heat exchange unit of the ground source heat pump subsystem through the transmission module of the ground source heat pump subsystem; the hot water / cold water that has completed heat exchange in the heat exchange unit is transmitted to the heat storage aquifer / cold storage aquifer;

[0106] The hot water / cold water is heat exchanged with the circulating medium through the heat exchange unit. After the circulating medium that has completed the heat exchange is heated and pressurized / cooled and depressurized, it exchanges heat with the air in the building facility to achieve heating / cooling; after the circulating medium that has completed the heat exchange with the air is cooled and depressurized / heated and pressurized, it exchanges heat with the hot water / cold water again to achieve circulating heating / cooling.

[0107] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An underground aquifer energy storage and ground source heat pump coupled heating / cooling system, characterized in that: include: Underground aquifer energy storage subsystem, including: Thermal aquifers for storing hot water and thus thermal energy, as well as cold water for heat exchange in the ground source heat pump subsystem; A cold storage aquifer, arranged above the heat storage aquifer, for storing the cold water and thus cold energy, and the hot water that completes the heat exchange in the ground source heat pump subsystem; Ground source heat pump subsystem, including: A transmission module, used for transmitting the hot water / cold water stored in the heat storage aquifer / cold storage aquifer to a heat exchange unit; transmitting the hot water / cold water that has completed heat exchange in the heat exchange unit to the cold storage aquifer / heat storage aquifer; The heat exchange unit is used to perform heat exchange between the hot water / the cold water and a circulating medium. After the circulating medium that has completed the heat exchange is heated and pressurized / cooled and depressurized, it performs heat exchange with the air in the building facility to achieve heating / cooling; after the circulating medium that has completed the heat exchange with the air is cooled and depressurized / heated and pressurized, it performs heat exchange with the hot water / the cold water again to achieve cyclic heating / cooling.

2. The underground aquifer energy storage and ground source heat pump coupled heating / cooling system according to claim 1 is characterized in that: The transmission module comprises: A hot water transmission module is used to transmit the hot water stored in the thermal storage aquifer to the heat exchange unit for heat exchange; and to transmit the cold water that has completed heat exchange in the heat exchange unit to the thermal storage aquifer for storage; The cold water transmission module is used to transmit the cold water stored in the cold storage aquifer to the heat exchange unit for heat exchange; and transmit the hot water that has completed heat exchange in the heat exchange unit to the cold storage aquifer for storage.

3. The underground aquifer energy storage and ground source heat pump coupled heating / cooling system according to claim 2 is characterized in that: The heat exchange unit comprises: The first heat exchange module is used to perform heat exchange between the hot water and the circulating medium, and input the circulating medium that has completed the heat exchange into the temperature and pressure increasing module; and perform heat exchange between the circulating medium output from the temperature and pressure decreasing module and the air in the building facility; A second heat exchange module is used to perform heat exchange between the cold water and the circulating medium, and input the circulating medium that has completed the heat exchange into the temperature reduction and pressure reduction module; and perform heat exchange between the circulating medium of the temperature increase and pressure increase module and the air in the building facility; A temperature and pressure increasing module, used to increase the temperature and pressure of the circulating medium that has completed heat exchange with the hot water and then input it into the second heat exchange module for heating; and to increase the temperature and pressure of the circulating medium that has completed heat exchange with the air in the building facility in the second heat exchange module and then input it into the first heat exchange module for heat exchange with the hot water; The temperature and pressure reduction module is used to reduce the temperature and pressure of the circulating medium that has completed heat exchange with the cold water and then input it into the first heat exchange module for refrigeration; and to reduce the temperature and pressure of the circulating medium that has completed heat exchange with the air in the building facility in the first heat exchange module and then input it into the second heat exchange module for heat exchange with the cold water.

4. The underground aquifer energy storage and ground source heat pump coupled heating / cooling system according to claim 3 is characterized in that: The system includes a heating cycle mode and a cooling cycle mode; In the heating cycle mode, the hot water stored in the thermal storage aquifer is transmitted to the first heat exchange module through the hot water transmission module to exchange heat with the circulating medium, the hot water that has completed the heat exchange is transmitted to the cold aquifer through the cold water transmission module for storage, the circulating medium that has completed the heat exchange is input into the temperature increase and pressure increase module for temperature increase and pressure increase, and then input into the second heat exchange module for heat exchange with the air in the building facility to achieve heating; the circulating medium that has completed the heat exchange with the air in the building facility is input into the temperature decrease and pressure decrease module for temperature decrease and pressure decrease, and then input into the first heat exchange module to achieve circulation heating; In the refrigeration cycle mode, the cold water stored in the cold storage aquifer is transferred to the second heat exchange module through the cold water transfer module to exchange heat with the circulating medium, the cold water that has completed the heat exchange is transferred to the hot aquifer through the hot water transfer module for storage, the circulating medium that has completed the heat exchange is input into the temperature reduction and pressure reduction module for temperature reduction and pressure reduction, and then input into the first heat exchange module for heat exchange with the air in the building facility to achieve refrigeration; the circulating medium that has completed the heat exchange with the air in the building facility is input into the temperature increase and pressure increase module for temperature increase and pressure increase, and then input into the second heat exchange module to achieve cyclic refrigeration.

5. The underground aquifer energy storage and ground source heat pump coupled heating / cooling system according to claim 4 is characterized in that: The first input end of the hot water transmission module is arranged in the thermal storage aquifer, the first output end of the hot water transmission module is connected to the input end of the first heat exchange module, the first circulating medium output end of the first heat exchange module is connected to the first input end of the temperature and pressure increasing module, the first output end of the temperature and pressure increasing module is connected to the second circulating medium input end of the second heat exchange module, the second circulating medium output end of the second heat exchange module is connected to the second input end of the temperature and pressure decreasing module, the second output end of the temperature and pressure decreasing module is connected to the first circulating medium input end of the first heat exchange module, the output end of the first heat exchange module is connected to the second input end of the cold water transmission module, and the second output end of the cold water transmission module is arranged in the cold storage aquifer; All of the input ends and the output ends are turned on in the heating cycle mode and turned off in the cooling cycle mode.

6. The underground aquifer energy storage and ground source heat pump coupled heating / cooling system according to claim 4, characterized in that: The first input end of the cold water transmission module is arranged in the cold storage aquifer, the first output end of the cold water transmission module is connected to the input end of the second heat exchange module, the first circulating medium output end of the second heat exchange module is connected to the first input end of the temperature reduction and pressure reduction module, the first output end of the temperature reduction and pressure reduction module is connected to the second circulating medium input end of the first heat exchange module, the second circulating medium output end of the first heat exchange module is connected to the second input end of the temperature increase and pressure increase module, the second output end of the temperature increase and pressure increase module is connected to the first circulating medium input end of the second heat exchange module, the output end of the second heat exchange module is connected to the second input end of the cold water transmission module, and the second output end of the cold water transmission module is arranged in the cold storage aquifer; All of the input ends and the output ends are turned on in the refrigeration cycle mode and turned off in the heating cycle mode.

7. The underground aquifer energy storage and ground source heat pump coupled heating / cooling system according to claim 4, characterized in that: Also includes: The hot water extraction module is used to extract the hot water stored in the heat storage aquifer to the hot water transmission module through the hot water extraction module in the heating cycle mode, and then transmit it to the first heat exchange module.

8. The underground aquifer energy storage and ground source heat pump coupled heating / cooling system according to claim 4, characterized in that: Also includes: The cold water extraction module is used to extract the cold water stored in the cold storage aquifer through the cold water extraction module to the cold water transmission module in the refrigeration cycle mode, and then transmit it to the second heat exchange module.

9. The underground aquifer energy storage and ground source heat pump coupled heating / cooling system according to claim 1, characterized in that: Also includes: An isolation layer having low permeability and low thermal conductivity, the isolation layer comprising: a first isolation layer, used to isolate the heat storage aquifer from the stratum below it; a second isolation layer, used to isolate the heat storage aquifer from the cold storage aquifer above it; The third isolation layer is used to isolate the cold storage aquifer from the ground surface.

10. A method for heating / cooling by coupling underground aquifer energy storage and ground source heat pump, applied to the underground aquifer energy storage and ground source heat pump coupling heating / cooling system according to any one of claims 1 to 9, characterized in that: include: The heat storage aquifer of the underground aquifer energy storage subsystem stores hot water and thus stores thermal energy, as well as cold water stored in the ground source heat pump subsystem to complete heat exchange; The cold water is stored in a cold storage aquifer disposed above the heat storage aquifer, thereby storing cold energy, and the hot water that is heat exchanged in the ground source heat pump subsystem is stored; The hot water / cold water stored in the heat storage aquifer / cold storage aquifer is transmitted to the heat exchange unit of the geothermal heat pump subsystem through the transmission module of the geothermal heat pump subsystem; the hot water / cold water that has completed heat exchange in the heat exchange unit is transmitted to the cold storage aquifer / the heat storage aquifer; The hot water / cold water is heat exchanged with a circulating medium through the heat exchange unit, and the circulating medium that has completed the heat exchange is heated and pressurized / cooled and depressurized before exchanging heat with the air in the building facility to achieve heating / cooling; the circulating medium that has completed the heat exchange with the air is cooled and depressurized / heated and pressurized before exchanging heat with the hot water / cold water again to achieve cyclic heating / cooling.

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