Seawater source heat pump coast well cross-seasonal heat storage system

Abstract

The invention discloses a seasonal heat storage system of a seawater source heat pump coast well, and relates to the technical field of energy utilization. A submersible pump in a first path pumps seawater from a pumping well, and the seawater enters a plate heat exchanger to perform cold-heat exchange with a second path. And the second path transmits the cooling capacity to the third path through the heat pump unit, and the user obtains refrigeration and takes away the heat of the user. In the mode, if heat storage is needed, seawater is discharged into the recharge well through the three-way valve, and cross-seasonal heat storage is achieved; if heat storage is not needed, seawater is directly discharged back to the ocean. In the heating mode, the submersible pump in the first path pumps seawater from the pumping well, and the seawater enters the plate heat exchanger to be subjected to cold-heat exchange with the second path and then is discharged back to the ocean. And the second path transfers heat to the third path through the heat pump unit, the user obtains heat supply, and meanwhile the cooling capacity returns to the system. By combining the seawater source and the heat storage coast well, the seasonal supply and demand contradiction is effectively relieved, meanwhile, the heat pump load in winter is reduced through the heat storage technology, and the operation cost is further saved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy utilization, and particularly to a seasonal heat storage system for a seawater source heat pump coastal well. Background Art

[0002] Seawater source heat pump is an efficient renewable energy technology that supplies energy to buildings by extracting heat or cold energy from seawater, with the advantages of being clean, environmentally friendly, and operating stably. However, the following problems still exist in its practical application:

[0003] Seasonal supply-demand contradiction: The seawater temperature is significantly affected by seasonal changes, being higher in summer and lower in winter, while the building energy demand shows the characteristics of needing cooling in summer and heating in winter, resulting in a seasonal mismatch between the energy supply capacity of the seawater source heat pump and the building demand.

[0004] Lack of long-term heat storage capacity: Traditional seawater source heat pump systems usually do not have the function of seasonal heat storage, and cannot store the surplus heat energy in summer for use in winter, or store the surplus cold energy in winter for use in summer, resulting in low energy utilization efficiency and difficulty in achieving stable all-year-round energy supply.

[0005] Limitations of existing heat storage technologies: Currently, some technologies have tried to combine seasonal heat storage with heat pump systems. For example:

[0006] Patent document 202410008677.3 proposes a ground source heat pump system based on PVT geothermal energy storage, but its design is mainly for ground source heat pumps and is difficult to be directly applied to seawater source heat pump systems, and it does not make full use of renewable energy electricity (such as photovoltaic and wind power) to supplement heat to the heat storage device.

[0007] Patent document 202110934457.X discloses a heating system combining a PVT heat pump and a water source heat pump, but its function is single, it can only heat and cannot cool, and it does not integrate seasonal heat storage technology and cannot solve the problem of seasonal regulation of energy. Summary of the Invention

[0008] The purpose of the present invention is to effectively solve the problems of low energy utilization efficiency and poor seasonal adaptability of traditional systems by combining the seasonal heat storage capacity of coastal wells with the high-efficiency energy supply characteristics of seawater source heat pumps.

[0009] To achieve the above purpose, the present application proposes a seasonal heat storage system for a seawater source heat pump coastal well, including four paths composed of a heat pump unit, a plate heat exchanger, a recharge well, a pumping well, and a solar and wind power generation system;

[0010] The first path is as follows: The outlet of the submersible pump in the pumping well is connected to port a of the plate heat exchanger, port d of the plate heat exchanger is connected to a three-way valve, one outlet of the three-way valve is connected to the ocean through a pipeline, and the other outlet is connected to the recharge well.

[0011] The second path is as follows: Port c of the plate heat exchanger is connected to inlet A of the heat pump unit, outlet D of the heat pump unit is connected to the inlet of the second circulation pump, and the outlet of the second circulation pump is connected to port b of the plate heat exchanger.

[0012] The third path is as follows: Outlet C of the heat pump unit is connected to the inlet of the user, the outlet of the user is connected to the inlet of the first circulation pump, and the outlet of the first circulation pump is connected to inlet B of the heat pump unit.

[0013] The fourth path is as follows: The solar and wind power generation system is connected to the inlet of the inverter, and the outlet of the inverter is respectively connected to the user and the heat pump unit.

[0014] In one embodiment, the outlet of the inverter is further connected to a heating cable, and the heating cable is located in the recharge well.

[0015] In one embodiment, the fourth path further includes a bidirectional connection between the inverter and the power grid.

[0016] In one embodiment, during the refrigeration process, the first path pumps seawater from the pumping well to the plate heat exchanger through the submersible pump; in the plate heat exchanger, the first path transfers the cold quantity to the second path, and at the same time the second path feeds back the heat to the first circulation path; the second path uses the circulation pump and the heat pump unit to transfer the obtained cold quantity to the third path, and the third path feeds back the heat to the second path; in the third path, the cold quantity is conveyed to the user through the first circulation pump, and at the same time the heat generated by the user is taken away, thus completing the entire refrigeration process.

[0017] In one embodiment, during the refrigeration process, when heat storage is required, the first path discharges the seawater to the recharge well to achieve cross-season heat storage; when heat storage is not required, the seawater is directly discharged back to the ocean.

[0018] In one embodiment, during the heating process, the first path pumps seawater from the pumping well to the plate heat exchanger through the submersible pump; in the plate heat exchanger, the first path transfers the heat to the second path, and at the same time the second path feeds back the cold quantity to the first path; the second path uses the circulation pump and the heat pump unit to transfer the obtained heat to the third path, and the third path feeds back the cold quantity to the second path; in the third path, the heat is conveyed to the user through the first circulation pump, and at the same time the cold quantity generated by the user is taken away, thus completing the entire heating process.

[0019] In one embodiment, during the heating process, the first path discharges the seawater coming out of the plate heat exchanger back into the ocean.

[0020] In one embodiment, during the heating process, the heat stored across seasons in the recharge well is transferred to the production well due to seepage.

[0021] In one embodiment, the electricity generated by the photovoltaic and wind power module is supplied to users through an inverter, or provides power for the heat pump unit, or is sold to the power grid, or is stored in the recharge well through heating cables for cross-seasonal heat storage.

[0022] In one embodiment, when the electricity generated by the photovoltaic and wind power module is insufficient to meet the demand, a part of the electricity is purchased from the power grid to ensure the electricity demand of users and the normal operation of the heat pump unit.

[0023] The above technical solutions adopted by the present invention, compared with the prior art, have the following advantages: 1. This system adopts a cross-seasonal heat storage solution mainly based on geothermal energy and ocean energy, supplemented by the power grid and new energy, which not only ensures the reliability and feasibility of system operation, but also reduces the dependence on fossil energy, reduces carbon emissions, protects the ecological environment, and conforms to the sustainable development strategy.

[0024] 2. During the refrigeration process, this system stores the waste heat generated by users through the recharge well, realizes the efficient recovery and utilization of heat energy, significantly reduces energy consumption, and improves energy utilization efficiency.

[0025] 3. This system can effectively isolate seawater from the heat pump equipment, reduce the corrosion and wear of the equipment, and thus extend the service life of the equipment.

[0026] 4. This system integrates multiple functions such as heating, refrigeration, heat storage, power purchase and power sale, making the overall operation more coordinated and efficient.

[0027] 5. By combining the seawater source with the heat storage coastal well, this system effectively alleviates the seasonal supply-demand contradiction, and at the same time uses the heat storage technology to reduce the heat pump load in winter, further saving the operation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is the structural schematic diagram of the cross-seasonal heat storage system of the seawater source heat pump coastal well;

[0029] Figure 2 is the structural effect diagram of the cross-seasonal heat storage system of the seawater source heat pump coastal well;

[0030] Wherein: 1. User; 2. First circulating water pump; 3. Heat pump unit; 4. Second circulating water pump; 5. Plate heat exchanger; 6. Three-way valve; 7. Recharge well; 8. Production well; 9. Submersible pump; 10. Ocean; 11. Solar and wind power generation system; 12. Inverter; 13. Power grid; 14. Heating cable. Detailed implementation manners

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clear and understood, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0033] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined. "Several" means one or more unless otherwise specifically defined.

[0034] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application.

[0035] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0036] Please refer to Figure 1-2 , this embodiment provides a seasonal heat storage system for a seawater source heat pump coastal well, including user 1, first circulation water pump 2, heat pump unit 3, second circulation water pump 4, plate heat exchanger 5, three-way valve 6, recharge well 7, pumping well 8, submersible pump 9, ocean 10, solar and wind power generation system 11, inverter 12, power grid 13 and heating cable 14. Among them, the pumping well 8 serves as a water intake device, and the recharge well 7 serves as a recharge device. The solar and wind power generation system includes photovoltaic panels and wind turbines. This system realizes heating, cooling and seasonal heat storage functions through four circulation paths. The specific paths are as follows:

[0037] The first path is the seawater circulation path: the submersible pump 9 pumps seawater from the pumping well 8 and transports it to port a of the plate heat exchanger 5. Port d of the plate heat exchanger 5 is connected to the three-way valve 6. The two outlets of the three-way valve 6 lead to the ocean 10 and the recharge well 7 respectively, completing the seawater circulation.

[0038] The second path is the heat pump heat exchange path: port c of the plate heat exchanger 5 is connected to the inlet A of the heat pump unit 3, and the outlet D of the heat pump unit 3 is connected to the second circulation water pump 4; the outlet of the second circulation water pump 4 is connected to port b of the plate heat exchanger 5 to form a closed cycle.

[0039] The third path is the user-side circulation path: the outlet C of the heat pump unit 3 is connected to the inlet of user 1, and the outlet of user 1 is connected to the first circulation water pump 2; the outlet of the first circulation water pump 2 is connected to the inlet B of the heat pump unit 3 to realize heat and cold exchange on the user side.

[0040] The fourth path is the power supply path: the solar and wind power generation system 11 is connected to the inlet of the inverter 12, and the outlet of the inverter 12 supplies power to user 1, heat pump unit 3 and heating cable 14 respectively. The inverter 12 is bidirectionally connected to the power grid 13 to realize the feeding back of surplus electricity or the purchase of electricity for supplement.

[0041] The operation mode of the above system is as follows:

[0042] Cooling mode: In the first path, the submersible pump 9 pumps seawater from the pumping well 8 and enters the plate heat exchanger 5 for heat and cold exchange with the second path. In the second path, the heat pump unit 3 transfers the cold quantity to the third path, and user 1 obtains cooling while taking away the heat of the user.

[0043] In this mode, if heat storage is required, the seawater is discharged into the recharge well 7 through the three-way valve 6 to realize seasonal heat storage; if heat storage is not required, the seawater is directly discharged back into the ocean 10.

[0044] Heating mode: In the first path, the submersible pump 9 extracts seawater from the pumping well 8, enters the plate heat exchanger 5, exchanges heat with the second path, and then is discharged back into the ocean. In the second path, the heat pump unit 3 transfers heat to the third path, and the user 1 obtains heating while the cold energy returns to the system.

[0045] In this mode, the heat stored in the recharge well 7 is transferred to the pumping well 8 through seepage heat exchange to increase the temperature of the heat source in winter.

[0046] The power management method in the above system is as follows:

[0047] Surplus power generation: When the lighting and / or wind conditions are good and the power generation can fully meet the demand, the power generated by the solar and wind power generation system 11 is preferentially supplied to the user 1 and the heat pump unit 3, and the excess power can be sold to the power grid 13 or stored in the recharge well 7 through the heating cable 14 in autumn.

[0048] Power shortage: When the lighting and wind are insufficient to meet the demand, power is purchased from the power grid 13 to ensure the operation of the system.

[0049] The effects of this embodiment are as follows:

[0050] Cross-seasonal heat storage: The heat stored in the recharge well 7 is gradually transferred to the pumping well 8 through seepage heat exchange, thereby increasing the temperature of the heat source in winter. Since the heat stored during winter heating is basically completely consumed, the heat transfer effect from the recharge well to the pumping well can be ignored during the summer cooling mode.

[0051] Efficient energy utilization: The heat pump unit 3 exchanges heat with seawater through the plate heat exchanger 5 to achieve combined heating and cooling supply.

[0052] Renewable energy integration: The solar and wind power generation system 11 and the power grid 13 supply power in cooperation to reduce carbon emissions and improve economic efficiency.

[0053] Sustainable operation: The seawater is finally discharged back into the ocean 10 or the recharge well 7 to maintain the water source balance and reduce environmental impact.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A seawater source heat pump coastal well seasonal heat storage system, characterized in that, It includes four paths composed of a heat pump unit, a plate heat exchanger, a recharge well, a production well, and a solar and wind power generation system; The first path is: the outlet of the submersible pump in the production well is connected to port a of the plate heat exchanger, port d of the plate heat exchanger is connected to a three-way valve, one outlet of the three-way valve is connected to the ocean through a pipeline, and the other outlet is connected to the recharge well; The second path is: port c of the plate heat exchanger is connected to inlet A of the heat pump unit, outlet D of the heat pump unit is connected to the inlet of the second circulation pump, and the outlet of the second circulation pump is connected to port b of the plate heat exchanger; The third path is: outlet C of the heat pump unit is connected to the inlet of the user, the outlet of the user is connected to the inlet of the first circulation pump, and the outlet of the first circulation pump is connected to inlet B of the heat pump unit; The fourth path is: the solar and wind power generation system is connected to the inlet of the inverter, and the outlets of the inverter are respectively connected to the user and the heat pump unit.

2. The seawater source heat pump coastal well seasonal heat storage system according to claim 1, characterized in that The outlet of the inverter is also connected to a heating cable, and this heating cable is located in the recharge well.

3. The seawater source heat pump coastal well seasonal heat storage system according to claim 1, characterized in that The fourth path also includes a bi-directional connection between the inverter and the power grid.

4. The seawater source heat pump coastal well seasonal heat storage system according to claim 1, characterized in that During the refrigeration process, the first path pumps seawater from the production well to the plate heat exchanger through the submersible pump; in the plate heat exchanger, the first path transfers the cold quantity to the second path, and at the same time the second path feeds back the heat to the first circulation path; the second path uses the circulation pump and the heat pump unit to transfer the obtained cold quantity to the third path, and the third path feeds back the heat to the second path; in the third path, the cold quantity is transported to the user through the first circulation pump, and at the same time the heat generated by the user is taken away, thus completing the entire refrigeration process.

5. The seawater source heat pump coastal well seasonal heat storage system according to claim 4, characterized in that, During the refrigeration process, when heat storage is required, the first path discharges the seawater into the recharge well to achieve cross-season heat storage; when heat storage is not required, the seawater is directly discharged back into the ocean.

6. The seawater source heat pump coastal well seasonal heat storage system according to claim 1, characterized in that During the heating process, the first path pumps seawater from the production well to the plate heat exchanger through the submersible pump. In the plate heat exchanger, the first path transfers the heat to the second path, and at the same time the second path feeds back the cold quantity to the first path; the second path uses the circulation pump and the heat pump unit to transfer the obtained heat to the third path, and the third path feeds back the cold quantity to the second path; in the third path, the heat is transported to the user through the first circulation pump, and at the same time the cold quantity generated by the user is taken away, thus completing the entire heating process.

7. The seawater source heat pump coastal well seasonal heat storage system according to claim 6, characterized in that, During the heating process, the first path discharges the seawater coming out of the plate heat exchanger back into the ocean.

8. The seawater source heat pump coastal well seasonal heat storage system according to claim 6, characterized in that, During the heating process, the heat stored across seasons in the recharge well will be transferred to the production well due to seepage.

9. The seawater source heat pump coastal well seasonal heat storage system according to claim 1, characterized in that The electricity generated by the photovoltaic and wind power modules is supplied to the user through the inverter, or provides power for the heat pump unit, or is sold to the power grid, or is stored in the recharge well through the heating cable for cross-season heat storage.

10. The seawater source heat pump coastal well seasonal heat storage system according to claim 1, characterized in that, When the electricity generated by the photovoltaic and wind power modules is insufficient to meet the demand, a part of the electricity is purchased from the power grid to ensure the electricity demand of the user and the normal operation of the heat pump unit.

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