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

Abstract

The utility model 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 utility model relates to the technical field of energy utilization, and in particular to a seawater source heat pump coastal well cross-seasonal heat storage system. BACKGROUND

[0002] Seawater source heat pump is a kind of high-efficiency renewable energy technology, which extracts heat or cold energy from seawater to supply energy for buildings, with the advantages of clean and environmentally friendly, stable operation. However, this technology still has the following problems in practical application:

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

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

[0005] Limitations of existing heat storage technologies: some technologies have tried to combine cross-seasonal heat storage and heat pump systems, for example:

[0006] Patent document 202410008677.3 proposes a PVT rock-soil energy storage-based ground source heat pump system, but its design is mainly for ground source heat pumps, which is difficult to directly apply to seawater source heat pump systems, and does not fully utilize renewable energy power (such as photovoltaic and wind power) to supplement the heat of the heat storage device.

[0007] Patent document 202110934457.X discloses a PVT heat pump combined with a water source heat pump heating system, but its function is single, only heating and no cooling, and does not integrate cross-seasonal heat storage technology, which cannot solve the seasonal regulation and storage problem of energy. UTILITY MODEL CONTENT

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

[0009] To achieve the above purpose, the seawater source heat pump coastal well cross-seasonal heat storage system is proposed, which includes a heat pump unit, a plate heat exchanger, a recharge well, a pumping well, a solar and wind power generation system, and four paths;

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

[0011] The second path is that port c of the plate heat exchanger is connected with inlet A of the heat pump unit, outlet D of the heat pump unit is connected with inlet of the second circulating water pump, and outlet of the second circulating water pump is connected with port b of the plate heat exchanger.

[0012] The third path is that outlet C of the heat pump unit is connected with inlet of the user, outlet of the user is connected with inlet of the first circulating water pump, and outlet of the first circulating water pump is connected with inlet B of the heat pump unit.

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

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

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

[0016] In one embodiment, in the refrigeration process, the first path draws seawater in the pumping well to the plate heat exchanger through the submersible pump; in the plate heat exchanger, the first path transfers cold energy to the second path, while the second path feeds back heat to the first circulating path; the second path transfers the obtained cold energy to the third path by using the circulating water pump and the heat pump unit, while the third path feeds back heat to the second path; in the third path, the first circulating water pump delivers cold energy to the user while taking away the heat generated by the user, thereby completing the entire refrigeration process.

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

[0018] In one embodiment, in the heating process, the first path draws seawater in the pumping well to the plate heat exchanger through the submersible pump; in the plate heat exchanger, the first path transfers heat to the second path, while the second path feeds back cold energy to the first path; the second path transfers the obtained heat to the third path by using the circulating water pump and the heat pump unit, while the third path feeds back cold energy to the second path; in the third path, the first circulating water pump delivers heat to the user while taking away the cold energy generated by the user, thereby completing the entire heating process.

[0019] In one of the embodiments, in the heating process, the first path discharges the seawater from the plate heat exchanger back to the sea.

[0020] In one of the embodiments, in the heating process, the heat stored in the recharge well across seasons is transferred to the pumping well due to seepage.

[0021] In one of the embodiments, the electricity generated by the photovoltaic and wind power module 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-seasonal heat storage.

[0022] In one of the embodiments, when the electricity generated by the photovoltaic and wind power module is insufficient to meet the demand, part of the electricity is purchased through the power grid to ensure the user's electricity demand and the normal operation of the heat pump unit.

[0023] The above technical scheme of the utility model has the advantages compared with the prior art: 1. The system adopts a cross-seasonal heat storage scheme 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 dependence on fossil energy, reduces carbon emissions, protects the ecological environment, and conforms to the sustainable development strategy.

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

[0025] 3. The system can effectively isolate seawater and heat pump equipment, reduce corrosion and wear of the equipment, and prolong the service life of the equipment.

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

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

[0028] Fig. 1 Structure principle diagram of seawater source heat pump coastal well cross-seasonal heat storage system;

[0029] Fig. 2 Structure effect diagram of seawater source heat pump coastal well cross-seasonal heat storage system;

[0030] Wherein: 1, user, 2, the first circulating water pump, 3, heat pump unit, 4, the second circulating water pump, 5, plate heat exchanger, 6, three-way valve, 7, rechargeable well, 8, pumping well, 9, submersible pump, 10, ocean, 11, solar and wind power generation system, 12, inverter, 13, power grid, 14, heating cable. DETAILED DESCRIPTION

[0031] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects clearer, the present application will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and 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", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0034] In the description of the present application, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] Referring to Figs. 1-2 The embodiment provides a seawater source heat pump coastal well cross-season heat storage system, which comprises a user 1, a first circulating water pump 2, a heat pump unit 3, a second circulating water pump 4, a plate heat exchanger 5, a three-way valve 6, a recharge well 7, a pumping well 8, a submersible pump 9, a sea 10, a solar and wind power generation system 11, an inverter 12, a power grid 13 and a heating cable 14, wherein the pumping well 8 serves as a water taking device, the recharge well 7 serves as a recharge device, the solar and wind power generation system comprises a photovoltaic power generation panel and a wind turbine, the system realizes the functions of heating, refrigeration and cross-season heat storage through four circulating paths, and the specific paths are as follows:

[0037] The first path, i.e. the seawater circulating path: the seawater is pumped from the pumping well 8 by the submersible pump 9 and is transported to the port a of the plate heat exchanger 5, the port d of the plate heat exchanger 5 is connected with the three-way valve 6, the two outlets of the three-way valve 6 are connected with the sea 10 and the recharge well 7 respectively, and the seawater circulation is completed.

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

[0039] The third path, i.e. the user side circulating path: the outlet C of the heat pump unit 3 is connected with the inlet of the user 1, the outlet of the user 1 is connected with the first circulating water pump 2; the outlet of the first circulating water pump 2 is connected with the inlet B of the heat pump unit 3, and the cold and heat exchange of the user side is realized.

[0040] The fourth path, i.e. the power supply path: the solar and wind power generation system 11 is connected with the inlet of the inverter 12, the outlet of the inverter 12 supplies power to the user 1, the heat pump unit 3 and the heating cable 14 respectively, the inverter 12 is bidirectionally connected with the power grid 13, and the functions of feeding excess electricity to the power grid or purchasing electricity to supplement are realized.

[0041] The system operation mode is as follows:

[0042] The refrigeration mode: in the first path, the seawater is pumped from the pumping well 8 by the submersible pump 9 and enters the plate heat exchanger 5, and cold and heat exchange is performed with the second path. In the second path, the cold quantity is transmitted to the third path by the heat pump unit 3, the user 1 obtains refrigeration, and the heat of the user is taken away at the same time.

[0043] In this mode, if heat storage is needed, the seawater is discharged into the recharge well 7 through the three-way valve 6, and cross-season heat storage is realized; if heat storage is not needed, the seawater is directly discharged back to the sea 10.

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

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

[0046] The power management mode in the above system is:

[0047] Excess power generation: When the light and / or wind conditions are good, and the power generation can fully meet the demand, the power of 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 light and wind are insufficient to meet the demand, electricity is purchased from the power grid 13 to ensure system operation.

[0049] The effect of the embodiment is:

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

[0051] Energy efficient use: The heat pump unit 3 exchanges heat with seawater through the plate heat exchanger 5, realizing cold and heat supply.

[0052] Renewable energy integration: The solar and wind power generation system 11 cooperates with the power grid 13 to supply power, reduces carbon emissions, and improves economic efficiency.

[0053] Sustainable operation: Seawater is eventually discharged back to the ocean 10 or the recharge well 7, maintaining water source balance and reducing 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 not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions 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 interseasonal thermal storage system, characterized in that, It includes four pathways: heat pump units, plate heat exchangers, reinjection wells, pumping wells, and solar and wind power generation systems. 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 of the outlets of the three-way valve is connected to the ocean through a pipeline, and the other outlet is connected to the reinjection well. The second path is as follows: the inlet c of the plate heat exchanger is connected to the inlet A of the heat pump unit, the outlet D of the heat pump unit is connected to the inlet of the second circulating water pump, and the outlet of the second circulating water pump is connected to the inlet b of the plate heat exchanger. The third path is as follows: the outlet C of the heat pump unit is connected to the user's inlet, the user's outlet is connected to the inlet of the first circulating water pump, and the outlet of the first circulating water pump is connected to the inlet B of the heat pump unit. The fourth path is: the solar and wind power generation systems are connected to the inverter's inlet, and the inverter's outlets are connected to the user and the heat pump unit, respectively.

2. The seawater source heat pump coastal well interseasonal thermal storage system according to claim 1, characterized in that, The inverter's outlet is also connected to a heating cable located inside the reinjection well.

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

4. The seawater source heat pump coastal well interseasonal thermal storage system according to claim 1, characterized in that, In the cooling process, the first path uses a submersible pump to draw seawater from a well to a plate heat exchanger. In the plate heat exchanger, the first path transfers cooling energy to the second path, while the second path feeds heat back to the first circulation path. The second path uses a circulating water pump and a heat pump unit to transfer the obtained cooling energy to the third path, while the third path feeds heat back to the second path. In the third path, the first circulating water pump delivers cooling energy to the user and removes the heat generated by the user, thus completing the entire cooling process.

5. The seawater source heat pump coastal well interseasonal thermal storage system according to claim 4, characterized in that, During the cooling process, when heat storage is needed, the first path involves discharging seawater to the reinjection well to achieve cross-seasonal heat storage; when heat storage is not needed, the seawater is directly discharged back into the ocean.

6. The seawater source heat pump coastal well interseasonal thermal storage system according to claim 1, characterized in that, During the heating process, the first path uses a submersible pump to draw seawater from a well to a plate heat exchanger. In the plate heat exchanger, the first path transfers heat to the second path, while the second path feeds back cooling energy to the first path. The second path uses a circulating water pump and a heat pump unit to transfer the obtained heat to the third path, while the third path feeds back cooling energy to the second path. In the third path, the first circulating water pump delivers heat to the user while removing the cooling energy generated by the user, thus completing the entire heating process.

7. The seawater source heat pump coastal well interseasonal thermal storage system according to claim 6, characterized in that, During the heating process, the first path involves discharging seawater from the plate heat exchanger back into the ocean.

8. The seawater source heat pump coastal well interseasonal thermal storage system according to claim 6, characterized in that, During the heating process, the heat stored in the reinjection well across seasons will be transferred to the pumping well through seepage.

9. The seawater source heat pump coastal well interseasonal thermal storage system according to claim 1, characterized in that, The electricity generated by photovoltaic and wind power modules is supplied to users through inverters, or used to power heat pump units, or sold to the grid, or stored in reinjection wells via heating cables for cross-seasonal heat storage.

10. The seawater source heat pump coastal well interseasonal thermal 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, some electricity is purchased from the grid to ensure the user's electricity needs and the normal operation of the heat pump unit.

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