Periodic energy storage heat pump for solar energy coupling freezing point heat removal

Abstract

The utility model relates to a periodic energy storage heat pump for solar coupling freezing point heat removal, which belongs to the technical field of heat pumps and is characterized in that a first heat exchange part and a second heat exchange part are arranged in a solid-liquid phase change energy storage tank, and heat exchange is performed between the first heat exchange part and the second heat exchange part through a medium in the solid-liquid phase change energy storage tank; the two ends of the first heat exchange part communicate with a medium inlet and a medium outlet of the PVT photovoltaic panel correspondingly, and a liquid drainage pipeline and a liquid return pipeline are arranged on the second heat exchange part. Solar energy collects heat into the solid-liquid phase change energy storage tank through the PVT photovoltaic panel in the daytime and serves as a heat source, the PVT photovoltaic panel system stops working at night, the heat pump continues to extract residual heat in the water tank until the heat in the water tank is completely extracted and the phase change water tank is changed into solid ice, heat extraction at the freezing point is achieved, latent heat in the solid phase and the liquid phase is fully utilized, and energy is saved. Heat storage of solar energy is achieved, the part with insufficient heat at night is supplied by the boiler, and the utilization efficiency of the solar energy is improved by 12.2%.

Description

Technical Field

[0001] This utility model belongs to the field of heat pump technology, and in particular relates to a periodic energy storage heat pump that couples solar energy with freezing point heat extraction. Background Technology

[0002] With the increasing prominence of global climate and environmental issues, the utilization of clean energy is receiving growing attention worldwide. Solar energy, as a sustainable, pollution-free, and low-cost energy source, is gradually being developed and widely applied across various industries, such as power generation, energy storage, and heating. With technological advancements, the solar energy industry is expected to achieve breakthroughs in energy efficiency, becoming an important measure and energy method for countries worldwide to effectively address carbon neutrality and development.

[0003] Currently, the main applications of solar energy are light-heat, light-electricity, and light-heat-electricity, all of which can generate additional energy through the effect of light and thus be utilized. Humans have a long history of using solar energy, dating back to ancient times, but large-scale application truly began in the early 20th century with solar water heaters, marking a milestone in the development of solar energy applications. In recent years, with the development of science and technology, PVT photovoltaic power generation has been increasingly studied and explored by many experts and scholars, making solar photovoltaic power generation a new trend in solar energy applications. Its specific principle is: when solar energy falls on a photovoltaic cell, 20% of the energy can be converted into electrical energy, and the remaining 80% can be converted into heat, achieving a dual production effect of light-to-thermal-electricity conversion.

[0004] On the other hand, heat pumps, as devices that extract a large amount of heat from a low-temperature heat source and deliver it to a high-temperature object by consuming a small amount of electricity, are widely used in building heating, comprehensive utilization of industrial waste heat, and other fields. However, they often require a low-temperature heat source as the heat source, making the selection of the heat source crucial for heat pumps. Water has a high specific heat capacity; every 1 kg of liquid water can absorb 4.2 kJ of heat, and the heat of solution of 1 kg of solid water is 334 kg / kg. It can store a large amount of heat during the entire solid-liquid phase change process. During the heat release process, when liquid water completely freezes to 0°C, it can also release a large amount of heat of condensation. Therefore, by controlling and changing the phase state of liquid materials, liquid water can be effectively made into a potential heat storage material, thus requiring a device or system that can comprehensively utilize multiple heat sources. Utility Model Content

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a periodic energy storage heat pump with solar coupling freezing point heat extraction, comprising: a solid-liquid phase change energy storage box, wherein a first heat exchange section and a second heat exchange section are provided in the solid-liquid phase change energy storage box, the first heat exchange section and the second heat exchange section exchange heat through a medium in the solid-liquid phase change energy storage box, the two ends of the first heat exchange section are respectively connected to the medium inlet and the medium outlet of the PVT photovoltaic panel, the second heat exchange section is provided with a drain pipe and a return pipe, a heat collection circulation pump is provided on the pipe through which the liquid medium circulates between the first heat exchange section and the PVT photovoltaic panel, and an intermediate circulation pump is provided on the drain pipe or the return pipe.

[0006] Furthermore, the PVT photovoltaic panel supplies electrical energy to the heat collection circulation pump and the intermediate circulation pump after voltage regulation by the inverter.

[0007] Furthermore, it also includes a liquid storage tank, which is equipped with a heat-releasing part. One end of the heat-releasing part is connected to the drain pipe, and the other end of the heat-releasing part is connected to the return pipe. The liquid storage tank is equipped with an outlet pipe and an inlet pipe.

[0008] Furthermore, it also includes an evaporator, wherein the drain pipe and the return pipe are both connected to the heat absorption side of the evaporator, the medium outlet on the circulation side of the evaporator is connected to the medium inlet of the compressor through a pipe, the medium outlet of the compressor is connected to one end of the heat release section provided in the liquid storage tank through a pipe, the other end of the heat release section is connected to the medium inlet of the throttle valve through a pipe, the medium outlet of the throttle valve is connected to the medium inlet on the circulation side of the evaporator through a pipe, and the liquid storage tank is provided with a liquid outlet pipe and a liquid inlet pipe.

[0009] Furthermore, it also includes an evaporator, wherein the drain pipe and the return pipe are both connected to the heat absorption side of the evaporator, the medium outlet of the evaporator circulation side is connected to the compressor medium inlet through a pipe, the compressor medium outlet is connected to one end of the condenser circulation side through a pipe, the other end of the condenser circulation side is connected to the throttle valve medium inlet through a pipe, the throttle valve medium outlet is connected to the evaporator medium inlet through a pipe, and the condenser heat release side is provided with a liquid outlet pipe and a liquid inlet pipe.

[0010] Furthermore, it also includes a boiler, the medium outlet of which is connected to the heat user's water supply pipeline via a parallel connection of a pipeline and a drain pipeline, the medium inlet and return pipeline of which are connected to the heat user's water outlet pipeline via a parallel connection, and a boiler circulation pump is installed on the pipeline between the heat user and the boiler.

[0011] Furthermore, the boiler is an electric boiler, and the PVT photovoltaic panels supply electrical energy to the boiler and boiler circulation pump after voltage regulation by an inverter.

[0012] Furthermore, it also includes a boiler, wherein the medium outlet of the boiler is connected to the heat user's water supply pipeline via a parallel connection of a pipeline and a liquid outlet pipeline, and the medium inlet and liquid inlet pipeline of the boiler are connected to the heat user's water outlet pipeline via a parallel connection of a pipeline, a boiler circulation pump is installed on the pipeline between the heat user and the boiler, and a useful heat circulation pump is installed on the liquid outlet pipeline.

[0013] Furthermore, the boiler is an electric boiler, and the PVT photovoltaic panels supply electrical energy to the boiler, boiler circulation pump and heat circulation pump after voltage regulation by an inverter.

[0014] Furthermore, the boiler is an electric boiler, and the PVT photovoltaic panels supply electrical energy to the compressor, boiler, boiler circulation pump and heat circulation pump after voltage regulation by the inverter.

[0015] The beneficial effects of this utility model are:

[0016] During the day, solar energy is collected in the solid-liquid phase change energy storage tank through PVT photovoltaic panels as a heat source. At night, the PVT photovoltaic panel system stops working, and the heat pump continues to extract the remaining heat in the water tank until all the heat in the water tank is extracted. The phase change water tank turns into solid ice, realizing freezing point heat extraction and making full use of the latent heat in the solid and liquid phases to achieve solar thermal storage. The part of the heat that is insufficient at night is supplied by the boiler, which improves the utilization efficiency of solar energy by 12.2%. Attached Figure Description

[0017] Figure 1 This is a system diagram of Embodiment 1 of this utility model;

[0018] Figure 2 This is a system diagram of Embodiment 2 of this utility model;

[0019] Figure 3 This is a system diagram of embodiment 3 of this utility model;

[0020] Figure 4 This is a system diagram of embodiment 4 of this utility model. Detailed Implementation

[0021] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0024] Example 1: As Figure 1As shown, a solar-coupled freezing-point heat extraction periodic energy storage heat pump includes: a solid-liquid phase change energy storage tank 100, wherein a first heat exchange section 101 and a second heat exchange section 102 are provided inside the solid-liquid phase change energy storage tank 100. The first heat exchange section 101 and the second heat exchange section 102 exchange heat through a medium within the solid-liquid phase change energy storage tank 100. The two ends of the first heat exchange section 101 are respectively connected to the medium inlet and the medium outlet of a PVT photovoltaic panel 200. The second heat exchange section 102 is provided with a drain pipe 103 and a return pipe 104. A heat collection circulation pump 1000 is provided on the pipeline through which the liquid medium circulates between the first heat exchange section 101 and the PVT photovoltaic panel 200, and an intermediate circulation pump 1100 is provided on the drain pipe 103 or the return pipe 104. The PVT photovoltaic panel 200, after voltage regulation by the inverter 1200, supplies electrical energy to the heat collection circulation pump 1000 and the intermediate circulation pump 1100. The system also includes a boiler 700. The medium outlet of the boiler 700 is connected to the heat user's inlet water pipe via a parallel connection of a pipeline and a drain pipeline 103. The medium inlet and return pipeline 104 of the boiler 700 are connected to the heat user's outlet water pipe in parallel. A boiler circulation pump 800 is installed on the pipeline between the heat user and the boiler 700. The PVT photovoltaic panel 200, after voltage regulation by the inverter 1200, supplies electrical energy to the boiler circulation pump 800. The first heat exchange section 101 and the second heat exchange section 102 are heat exchange tubes or heat exchange plates. The heat exchange tubes are spiral heat exchange tubes. The boiler 700 is an electric boiler, and the PVT photovoltaic panel 200 supplies electrical energy to the boiler 700 after voltage regulation by the inverter 1200.

[0025] The solid-liquid phase change energy storage tank 100 is a closed box or tank, mainly used to store the heat transfer medium. The heat transfer medium inside the solid-liquid phase change energy storage tank 100 can undergo a solid-liquid phase change at a specific temperature. An insulation layer can be installed outside the solid-liquid phase change energy storage tank 100 to prevent heat loss. The solid-liquid phase change energy storage tank 100 is equipped with a liquid exchange port for replacing the heat transfer medium inside, and an external circulation device can be used to periodically replace the heat transfer medium, thereby maintaining the performance of the heat transfer medium and heat transfer... The medium can be water, etc. The structures of the first heat exchange section 101 and the second heat exchange section 102 can be the same or different. That is, the first heat exchange section 101 can be a heat exchange tube or a heat exchange plate, and the corresponding second heat exchange section 102 can be a heat exchange plate or a heat exchange tube, or both can be heat exchange tubes or heat exchange plates. The number of heat exchange plates depends on the situation. The optimal shape of the heat exchange tube is spiral, but it can also be serpentine, grid, etc. The PVT photovoltaic panel 200, also known as a photovoltaic thermal panel, is a high-efficiency solar energy utilization technology that combines photovoltaic power generation and solar thermal collection functions. This technology can not only convert solar energy into electrical energy, but also use the heat generated by solar radiation to heat water or other media, realizing multiple uses of energy. The heat collection circulation pump 1000 is used to drive the medium in the first heat exchange section 101 to circulate in the first heat exchange section 101 and the PVT photovoltaic panel 200. The intermediate circulation pump 1100 is used to drive the medium in the second heat exchange section 102 to circulate in the second heat exchange section 102 and the heat user.

[0026] In this application, during the daytime operation: With abundant solar energy resources, the PVT photovoltaic panel 200 can efficiently convert solar radiation into electrical and thermal energy. First, the PVT photovoltaic panel absorbs sunlight, and a portion of the energy is converted into electrical energy. After voltage regulation by the inverter 1200, this electrical energy powers the collector circulation pump 1000, the intermediate circulation pump 1100, and the boiler circulation pump 800. The remaining energy is used to heat the medium inside the PVT photovoltaic panel, which then enters the first heat exchange section 101 of the solid-liquid phase change energy storage tank 100 through pipelines. In the first heat exchange section, heat is transferred from the medium to the heat transfer medium within the solid-liquid phase change energy storage tank, causing its temperature to rise and potentially undergoing a phase change from solid to liquid, thus storing a large amount of thermal energy.

[0027] Meanwhile, the medium in the second heat exchange section 102 begins to exchange heat with the heat transfer medium in the solid-liquid phase change energy storage tank, absorbing heat. This heat is then transported to the user's water supply pipe through the drain pipe 103, providing hot water or other forms of heat to the user. During this process, the intermediate circulation pump 1100 ensures effective circulation of the medium between the second heat exchange section and the user. It can provide additional heat source support for the boiler 700 to meet all the user's heat needs. Throughout the day's operation, the system components work closely together to achieve effective utilization and storage of solar energy, while also ensuring stable heating at the user end.

[0028] Nighttime operation: The PVT photovoltaic panels can no longer generate electricity and heat. At this time, the system mainly relies on the heat energy accumulated in the solid-liquid phase change energy storage tank 100 during the day as a heat source. Specifically, when the user needs heat energy, the medium in the second heat exchange section 102 will exchange heat with the heat transfer medium in the solid-liquid phase change energy storage tank, absorbing the heat stored therein. Before the heat transfer medium reaches the freezing point, it is the transfer of sensible heat; after the heat transfer medium reaches the freezing point, it is the transfer of latent heat, thus making full use of the heat energy. This heat is then transferred to the user's water supply pipe through the drain pipe 103 to provide the user with the required hot water or other forms of heat.

[0029] If the heat generated in the solid-liquid phase change energy storage tank is insufficient to meet the user's needs, the electric boiler 700 serves as the primary energy source for supplemental heating. The electric boiler obtains electricity from the excess power generated by the PVT photovoltaic panels during the day via the inverter 1200 to heat water or other media, ensuring stable heating at the user's end. Furthermore, at night, the system can adjust its operating mode according to actual conditions, such as reducing unnecessary energy consumption and optimizing system efficiency, further improving energy utilization efficiency. In this way, even without sunlight, the system can effectively guarantee the user's heating needs, achieving stable heating service around the clock.

[0030] Example 2: As Figure 2As shown, a solar-coupled freezing-point heat extraction periodic energy storage heat pump includes: a solid-liquid phase change energy storage tank 100, wherein a first heat exchange section 101 and a second heat exchange section 102 are provided inside the solid-liquid phase change energy storage tank 100. The first heat exchange section 101 and the second heat exchange section 102 exchange heat through a medium within the solid-liquid phase change energy storage tank 100. The two ends of the first heat exchange section 101 are respectively connected to the medium inlet and the medium outlet of a PVT photovoltaic panel 200. The second heat exchange section 102 is provided with a drain pipe 103 and a return pipe 104. A heat collection circulation pump 1000 is provided on the pipeline through which the liquid medium circulates between the first heat exchange section 101 and the PVT photovoltaic panel 200, and an intermediate circulation pump 1100 is provided on the drain pipe 103 or the return pipe 104. The PVT photovoltaic panel 200, after voltage regulation by the inverter 1200, supplies electrical energy to the heat collection circulation pump 1000 and the intermediate circulation pump 1100. It also includes a liquid storage tank 300, which contains a heat dissipation section 301. One end of the heat dissipation section 301 is connected to the drain pipe 103, and the other end is connected to the return liquid pipe 104. The liquid storage tank 300 is equipped with an outlet pipe 302 and an inlet pipe 303. It also includes a boiler 700. The medium outlet of the boiler 700 is connected to the heat user's water supply pipe via a parallel connection of the pipe and the outlet pipe 302. The medium inlet of the boiler 700 and the inlet pipe 303 are connected to the heat user's outlet water pipe in parallel. A boiler circulation pump 800 is installed on the pipe between the heat user and the boiler 700, and a useful heat circulation pump 900 is installed on the outlet pipe 302. The PVT photovoltaic panel 200 supplies electrical energy to the boiler circulating pump 800 and the heat circulation pump 900 after voltage regulation by the inverter 1200. The first heat exchange section 101 and the second heat exchange section 102 are heat exchange tubes or heat exchange plates. The heat exchange tubes are spiral heat exchange tubes. The boiler 700 is an electric boiler, and the PVT photovoltaic panel 200 supplies electrical energy to the boiler 700 after voltage regulation by the inverter 1200.

[0031] The difference between this embodiment and embodiment 1 is that a liquid storage tank 300 and a heat dissipation part 301 inside the liquid storage tank 300 are added. The liquid storage tank 300 can serve as a heat stabilization unit, playing the role of heat storage and heat buffering, so as to avoid excessive fluctuations in the terminal heating temperature and reduce the comfort of heat users.

[0032] In this application, during the daytime operation: With abundant solar energy resources, the PVT photovoltaic panel 200 can efficiently convert solar radiation into electrical and thermal energy. First, the PVT photovoltaic panel absorbs sunlight, and a portion of the energy is converted into electrical energy. After voltage regulation by the inverter 1200, this electrical energy powers the collector circulation pump 1000, intermediate circulation pump 1100, boiler circulation pump 800, and heat-using circulation pump 900. The remaining energy is used to heat the medium inside the PVT photovoltaic panel, which then enters the first heat exchange section 101 of the solid-liquid phase change energy storage tank 100 through pipelines. In the first heat exchange section, heat is transferred from the medium to the heat transfer medium within the solid-liquid phase change energy storage tank, causing its temperature to rise and potentially undergoing a phase change from solid to liquid, thus storing a large amount of thermal energy.

[0033] Simultaneously, the medium in the second heat exchange section 102 begins to exchange heat with the heat transfer medium in the solid-liquid phase change energy storage tank, absorbing heat. This heat is then transferred to the heat release section 301 of the storage tank 300 via the drain pipe 103. In the heat release section, the heat is further transferred to the medium in the storage tank and delivered to the user's water supply pipe via the outlet pipe 302, providing hot water or other forms of heat to the user. During this process, the heat circulation pump 900 ensures effective circulation of the medium between the storage tank and the user, providing additional heat source support to the boiler 700 to meet all the user's heat needs.

[0034] Nighttime Operation: At night, without sunlight, the PVT photovoltaic panels can no longer generate electricity and heat. At this time, the system primarily relies on the heat accumulated during the day in the solid-liquid phase change energy storage tank 100 and the storage tank 300 to meet the user's heat needs. Specifically, the medium in the second heat exchange section 102 exchanges heat with the heat transfer medium in the solid-liquid phase change energy storage tank, absorbing the stored heat. This heat is then transferred through the drain pipe 103 to the heat release section 301 of the storage tank 300, where it is further transferred to the medium in the storage tank.

[0035] The medium in the storage tank is transported to the user's water supply pipeline through the outlet pipe 302, providing the user with the required hot water or other forms of heat. If the heat in the solid-liquid phase change energy storage tank is insufficient to meet the user's needs, the electric boiler 700 is mainly used as the heat source. The electric boiler obtains electricity from the excess electricity generated by the PVT photovoltaic panels during the day through the inverter 1200 to heat water or other media, ensuring the stability of the heating supply at the user end.

[0036] Example 3: As Figure 3As shown, a solar-coupled freezing-point heat extraction periodic energy storage heat pump includes: a solid-liquid phase change energy storage tank 100, wherein a first heat exchange section 101 and a second heat exchange section 102 are provided inside the solid-liquid phase change energy storage tank 100. The first heat exchange section 101 and the second heat exchange section 102 exchange heat through a medium within the solid-liquid phase change energy storage tank 100. The two ends of the first heat exchange section 101 are respectively connected to the medium inlet and the medium outlet of a PVT photovoltaic panel 200. The second heat exchange section 102 is provided with a drain pipe 103 and a return pipe 104. A heat collection circulation pump 1000 is provided on the pipeline through which the liquid medium circulates between the first heat exchange section 101 and the PVT photovoltaic panel 200, and an intermediate circulation pump 1100 is provided on the drain pipe 103 or the return pipe 104.

[0037] The PVT photovoltaic panel 200 supplies electrical energy to the heat collection circulation pump 1000 and the intermediate circulation pump 1100 after voltage regulation by the inverter 1200. It also includes an evaporator 400. The drain pipe 103 and the return pipe 104 are both connected to the heat absorption side of the evaporator 400. The medium outlet of the evaporator 400's circulation side is connected to the medium inlet of the compressor 500 via a pipe. The medium outlet of the compressor 500 is connected to one end of a heat release section 301 located inside the liquid storage tank 300 via a pipe. The other end of the heat release section 301 is connected to the medium inlet of the throttle valve 600 via a pipe. The medium outlet of the throttle valve 600 is connected to the medium inlet of the evaporator 400's circulation side via a pipe. The liquid storage tank 300 is equipped with an outlet pipe 302 and an inlet pipe 303. The system also includes a boiler 700. The medium outlet of the boiler 700 is connected to the heat user's water supply pipe via a parallel connection of a pipeline and a liquid outlet pipeline 302. The medium inlet and liquid inlet pipeline 303 of the boiler 700 are connected to the heat user's water outlet pipeline via a parallel connection. A boiler circulation pump 800 is installed on the pipeline between the heat user and the boiler 700, and a heat circulation pump 900 is installed on the liquid outlet pipeline 302. The PVT photovoltaic panel 200, after voltage regulation by an inverter 1200, supplies electrical energy to the compressor 500, boiler circulation pump 800, and heat circulation pump 900. The first heat exchange section 101 and the second heat exchange section 102 are heat exchange tubes or heat exchange plates. The heat exchange tubes are spiral heat exchange tubes. The boiler 700 is an electric boiler, and the PVT photovoltaic panel 200, after voltage regulation by an inverter 1200, supplies electrical energy to the boiler 700.

[0038] The difference between this embodiment and embodiment 2 is that an evaporator 400, a compressor 500, and a throttling valve 600 are added. When the temperature of the phase change water tank 100 is too low, the refrigerant working fluid compression cycle is used to transfer the remaining heat in the water tank to the heat release section 301 through the compression cycle of the evaporator 500, thereby improving the low-grade heat.

[0039] In this application, during the daytime operation: With abundant solar energy resources, the PVT photovoltaic panel 200 can efficiently convert solar radiation into electrical and thermal energy. First, the PVT photovoltaic panel absorbs sunlight, and a portion of the energy is converted into electrical energy. After voltage regulation by the inverter 1200, this electrical energy powers the collector circulation pump 1000, intermediate circulation pump 1100, compressor 500, boiler circulation pump 800, and heat-using circulation pump 900. The remaining energy is used to heat the medium inside the PVT photovoltaic panel, which then enters the first heat exchange section 101 of the solid-liquid phase change energy storage tank 100 through pipelines. In the first heat exchange section, heat is transferred from the medium to the heat transfer medium within the solid-liquid phase change energy storage tank, causing its temperature to rise and potentially undergoing a phase change from solid to liquid, thus storing a large amount of thermal energy.

[0040] Meanwhile, the medium in the second heat exchange section 102 begins to exchange heat with the heat transfer medium in the solid-liquid phase change energy storage tank, absorbing heat. This heat is then transferred to the heat absorption side of the evaporator 400 through the drain pipe 103. Inside the evaporator, the low-temperature, low-pressure refrigerant absorbs this heat and evaporates into a gas, which then enters the compressor 500 through a pipe. The compressor compresses the refrigerant gas, increasing its temperature and pressure to form a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant then enters the heat release section 301 in the liquid receiver 300 through a pipe, releasing a large amount of heat in the process and transferring it to the medium in the liquid receiver.

[0041] The medium in the storage tank is delivered to the user's water supply line via the outlet pipe 302, providing the user with the required hot water or other forms of heat. During this process, a heat circulation pump 900 ensures effective circulation of the medium between the storage tank and the user. If the user's heat demand exceeds the current system's capacity, or under certain specific conditions, such as inclement weather, an additional heat source can be provided by the boiler 700 to meet the user's full heat demand. Throughout the day's operation, all components of the system work closely together to achieve efficient utilization and storage of solar energy, while also ensuring stable heating at the user's end.

[0042] Furthermore, the refrigerant, after releasing heat, is depressurized and cooled by the expansion valve 600, returning to a low-temperature, low-pressure liquid state before returning to the circulation-side inlet of the evaporator 400 through pipelines, completing a full heat pump cycle. This design not only improves the overall efficiency of the system but also enhances its flexibility and adaptability.

[0043] During nighttime operation, without sunlight, the PVT photovoltaic panels cannot continue to generate electricity and heat. At this time, the system primarily relies on the heat accumulated during the day in the solid-liquid phase change energy storage tank 100 and the liquid storage tank 300 to meet the user's heat needs. Specifically, when the user requires heat, the medium in the second heat exchange section 102 exchanges heat with the heat transfer medium in the solid-liquid phase change energy storage tank, absorbing the stored heat. This heat is then transferred to the heat absorption side of the evaporator 400 through the drain pipe 103.

[0044] Inside the evaporator, the low-temperature, low-pressure refrigerant absorbs heat and evaporates into a gas, which then enters the compressor 500 through pipes. The compressor compresses the refrigerant gas, increasing its temperature and pressure to form a high-temperature, high-pressure gaseous refrigerant. This high-temperature, high-pressure gaseous refrigerant then enters the heat release section 301 within the liquid receiver 300 through pipes, releasing a large amount of heat in the process and transferring it to the medium in the liquid receiver. The medium in the liquid receiver is then transported to the user's hot water supply pipe through the liquid outlet pipe 302, providing the user with the required hot water or other forms of heat.

[0045] If the heat generated in the solid-liquid phase change energy storage tank is insufficient to meet the user's needs, the electric boiler 700 can be activated as a heat source. The electric boiler obtains electricity from the excess electricity generated by the PVT photovoltaic panels during the day via the inverter 1200 to heat water or other media, ensuring the stability of heating at the user end. Using a heat pump as a heat conversion device enables the extraction of a large amount of heat from a low-temperature heat source with minimal electrical energy consumption. Compared to traditional direct solar heating, this system is more stable and provides better heating. The electricity generated by the PVT photovoltaic system is used to power the heat pump and the electric boiler itself, with the remainder supplied by the grid, significantly reducing the system's energy consumption by approximately 21.7%, achieving highly efficient energy utilization.

[0046] Example 4: Figure 4As shown, a solar-coupled freezing-point heat extraction periodic energy storage heat pump includes: a solid-liquid phase change energy storage tank 100, wherein a first heat exchange section 101 and a second heat exchange section 102 are provided inside the solid-liquid phase change energy storage tank 100. The first heat exchange section 101 and the second heat exchange section 102 exchange heat through a medium within the solid-liquid phase change energy storage tank 100. The two ends of the first heat exchange section 101 are respectively connected to the medium inlet and the medium outlet of a PVT photovoltaic panel 200. The second heat exchange section 102 is provided with a drain pipe 103 and a return pipe 104. A heat collection circulation pump 1000 is provided on the pipeline through which the liquid medium circulates between the first heat exchange section 101 and the PVT photovoltaic panel 200, and an intermediate circulation pump 1100 is provided on the drain pipe 103 or the return pipe 104. The PVT photovoltaic panel 200 supplies electrical energy to the heat collection circulation pump 1000 and the intermediate circulation pump 1100 after voltage regulation by the inverter 1200. It also includes an evaporator 400. The drain pipe 103 and the return pipe 104 are both connected to the heat absorption side of the evaporator 400. The medium outlet of the evaporator 400's circulation side is connected to the medium inlet of the compressor 500 via a pipe. The medium outlet of the compressor 500 is connected to one end of the condenser 304's circulation side via a pipe. The other end of the condenser 304's circulation side is connected to the medium inlet of the throttle valve 600 via a pipe. The medium outlet of the throttle valve 600 is connected to the medium inlet of the evaporator 400 via a pipe. The condenser 304's heat release side is provided with a liquid outlet pipe 302 and a liquid inlet pipe 303. The system also includes a boiler 700. The medium outlet of the boiler 700 is connected to the heat user's water supply pipe via a parallel connection of a pipeline and a liquid outlet pipeline 302. The medium inlet and liquid inlet pipeline 303 of the boiler 700 are connected to the heat user's water outlet pipeline via a parallel connection. A boiler circulation pump 800 is installed on the pipeline between the heat user and the boiler 700, and a heat circulation pump 900 is installed on the liquid outlet pipeline 302. The PVT photovoltaic panel 200, after voltage regulation by an inverter 1200, supplies electrical energy to the compressor 500, boiler circulation pump 800, and heat circulation pump 900. The first heat exchange section 101 and the second heat exchange section 102 are heat exchange tubes or heat exchange plates. The heat exchange tubes are spiral heat exchange tubes. The boiler 700 is an electric boiler, and the PVT photovoltaic panel 200, after voltage regulation by an inverter 1200, supplies electrical energy to the boiler 700.

[0047] The difference between this embodiment and embodiment 2 is that a heat pump system is added, the buffering function of the hot water storage tank is eliminated, and the heat pump's output water is directly used for heating users, which can reduce the initial investment in system construction to a certain extent.

[0048] In this application, during daytime operation, when solar energy resources are abundant, the PVT photovoltaic panel 200 can efficiently convert solar radiation into electrical and thermal energy. First, the PVT photovoltaic panel absorbs sunlight, and a portion of the energy is converted into electrical energy. After voltage regulation by the inverter 1200, this electrical energy powers the heat collection circulation pump 1000, the intermediate circulation pump 1100, the compressor 500, the boiler circulation pump 800, and the heat-using circulation pump 900. The remaining energy is used to heat the medium inside the PVT photovoltaic panel, which then enters the first heat exchange section 101 of the solid-liquid phase change energy storage tank 100 through pipelines. In the first heat exchange section, heat is transferred from the medium to the heat transfer medium within the solid-liquid phase change energy storage tank, causing its temperature to rise and potentially undergoing a phase change from solid to liquid, thus storing a large amount of thermal energy.

[0049] Meanwhile, the medium in the second heat exchange section 102 begins to exchange heat with the heat transfer medium in the solid-liquid phase change energy storage tank, absorbing heat. This heat is then transferred to the heat absorption side of the evaporator 400 through the drain pipe 103. Inside the evaporator, the low-temperature, low-pressure refrigerant absorbs this heat and evaporates into a gas, which then enters the compressor 500 through a pipe. The compressor compresses the refrigerant gas, increasing its temperature and pressure to form a high-temperature, high-pressure gaseous refrigerant. This high-temperature, high-pressure gaseous refrigerant then enters the circulation side of the condenser 304 through a pipe, releasing a large amount of heat in the process and transferring it to the medium in the condenser.

[0050] The medium on the heat dissipation side of condenser 304 is transported to the user's water supply line via outlet pipe 302, providing the user with the required hot water or other forms of heat. During this process, a heat circulation pump 900 ensures efficient circulation of the medium between the condenser and the user. If the user's heat demand exceeds the current system's capacity, or under certain specific conditions, such as inclement weather, additional heat source support can be provided by boiler 700 to meet the user's full heat demand. Throughout the day's operation, the system components work closely together to achieve efficient utilization and storage of solar energy, while also ensuring stable heating at the user end.

[0051] After releasing heat, the refrigerant passes through the expansion valve 600 to reduce its pressure and temperature, returning to a low-temperature, low-pressure liquid state. It then returns to the circulation-side inlet of the evaporator 400 through the pipeline, completing a full heat pump cycle. This design not only improves the overall efficiency of the system but also enhances its flexibility and adaptability.

[0052] During nighttime operation, without sunlight, the PVT photovoltaic panels cannot continue to generate electricity and heat. At this time, the system primarily relies on the heat energy accumulated during the day in the solid-liquid phase change energy storage tank 100 to meet the user's heat needs. Specifically, when the user requires heat energy, the medium in the second heat exchange section 102 exchanges heat with the heat transfer medium in the solid-liquid phase change energy storage tank, absorbing the stored heat. This heat is then transferred to the heat absorption side of the evaporator 400 through the drain pipe 103.

[0053] Inside the evaporator, the low-temperature, low-pressure refrigerant absorbs heat and evaporates into a gas, which then flows through pipes into compressor 500. The compressor compresses the refrigerant gas, increasing its temperature and pressure to form a high-temperature, high-pressure gaseous refrigerant. This high-temperature, high-pressure gaseous refrigerant then flows through pipes to the circulation side of condenser 304, releasing a significant amount of heat in the process and transferring it to the medium in the condenser. The medium in the condenser is then delivered to the user's hot water supply line through liquid outlet pipe 302, providing the user with the required hot water or other forms of heat.

[0054] If the heat generated in the solid-liquid phase change energy storage tank is insufficient to meet the user's needs, the electric boiler 700 can be activated as a heat source. The electric boiler obtains electricity from the excess electricity generated by the PVT photovoltaic panels during the day via the inverter 1200 to heat water or other media, ensuring the stability of heating at the user end. Using a heat pump as a heat conversion device enables the extraction of a large amount of heat from a low-temperature heat source with minimal electrical energy consumption. Compared to traditional direct solar heating, this system is more stable and provides better heating. The electricity generated by the PVT photovoltaic system is used to power the heat pump and the electric boiler itself, with the remainder supplied by the grid, significantly reducing the system's energy consumption by approximately 21.7%, achieving highly efficient energy utilization.

[0055] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made in accordance with the claims of this utility model should still fall within the patent coverage of this utility model.

Claims

1. A periodic energy storage heat pump that couples solar energy with freezing point heat extraction, characterized in that, include: A solid-liquid phase change energy storage box (100) is provided with a first heat exchange section (101) and a second heat exchange section (102). The first heat exchange section (101) and the second heat exchange section (102) exchange heat through the medium in the solid-liquid phase change energy storage box (100). The two ends of the first heat exchange section (101) are respectively connected to the medium inlet and the medium outlet of the PVT photovoltaic panel (200). The second heat exchange section (102) is provided with a drain pipe (103) and a return pipe (104). A heat collection circulation pump (1000) is provided on the pipe through which the liquid medium circulates between the first heat exchange section (101) and the PVT photovoltaic panel (200). An intermediate circulation pump (1100) is provided on the drain pipe (103) or the return pipe (104).

2. A periodic energy storage heat pump with solar-coupled freezing point heat extraction according to claim 1, characterized in that, The PVT photovoltaic panel (200) supplies electrical energy to the heat collection circulation pump (1000) and the intermediate circulation pump (1100) after voltage regulation by the inverter (1200).

3. A periodic energy storage heat pump with solar-coupled freezing point heat extraction according to claim 2, characterized in that, It also includes a liquid storage tank (300), which is provided with a heat dissipation part (301). One end of the heat dissipation part (301) is connected to the drain pipe (103), and the other end of the heat dissipation part (301) is connected to the return pipe (104). The liquid storage tank (300) is provided with an outlet pipe (302) and an inlet pipe (303).

4. A periodic energy storage heat pump with solar-coupled freezing point heat extraction according to claim 2, characterized in that, It also includes an evaporator (400), the drain pipe (103) and the return pipe (104) are both connected to the heat absorption side of the evaporator (400), the medium outlet of the evaporator (400) circulation side is connected to the medium inlet of the compressor (500) through a pipe, the medium outlet of the compressor (500) is connected to one end of the heat release part (301) provided in the liquid storage tank (300) through a pipe, the other end of the heat release part (301) is connected to the medium inlet of the throttle valve (600) through a pipe, the medium outlet of the throttle valve (600) is connected to the medium inlet of the evaporator (400) circulation side through a pipe, and the liquid storage tank (300) is provided with a liquid outlet pipe (302) and a liquid inlet pipe (303).

5. A periodic energy storage heat pump with solar-coupled freezing point heat extraction according to claim 2, characterized in that, It also includes an evaporator (400), the drain pipe (103) and the return pipe (104) are both connected to the heat absorption side of the evaporator (400), the medium outlet of the evaporator (400) circulation side is connected to the medium inlet of the compressor (500) through a pipe, the medium outlet of the compressor (500) is connected to one end of the circulation side of the condenser (304) through a pipe, the other end of the circulation side of the condenser (304) is connected to the medium inlet of the throttle valve (600) through a pipe, the medium outlet of the throttle valve (600) is connected to the medium inlet of the evaporator (400) through a pipe, and the heat release side of the condenser (304) is provided with a liquid outlet pipe (302) and a liquid inlet pipe (303).

6. A periodic energy storage heat pump with solar-coupled freezing point heat extraction according to claim 2, characterized in that, It also includes a boiler (700), the medium outlet of the boiler (700) is connected to the heat user's water supply pipeline through a pipeline and a drain pipeline (103) connected in parallel, the medium inlet and return pipeline (104) of the boiler (700) are connected to the heat user's water outlet pipeline through a pipeline connected in parallel, and a boiler circulation pump (800) is installed on the pipeline between the heat user and the boiler (700).

7. A periodic energy storage heat pump with solar-coupled freezing point heat extraction according to claim 6, characterized in that, The boiler (700) is an electric boiler, and the PVT photovoltaic panel (200) supplies electrical energy to the boiler (700) and the boiler circulation pump (800) after voltage regulation by the inverter (1200).

8. A solar-coupled freezing-point heat extraction periodic energy storage heat pump according to any one of claims 3-5, characterized in that, It also includes a boiler (700), the medium outlet of the boiler (700) is connected to the heat user's water supply pipeline through a pipeline and a liquid outlet pipeline (302) connected in parallel, the medium inlet of the boiler (700) is connected to the heat user's water outlet pipeline through a pipeline and a liquid inlet pipeline (303) connected in parallel, a boiler circulation pump (800) is installed on the pipeline between the heat user and the boiler (700), and a useful heat circulation pump (900) is installed on the liquid outlet pipeline (302).

9. A periodic energy storage heat pump with solar-coupled freezing point heat extraction according to claim 8, characterized in that, The boiler (700) is an electric boiler, and the PVT photovoltaic panel (200) supplies electrical energy to the boiler (700), boiler circulation pump (800) and heat circulation pump (900) after voltage regulation by the inverter (1200).

10. A periodic energy storage heat pump with solar-coupled freezing point heat extraction according to claim 8, characterized in that, The boiler (700) is an electric boiler, and the PVT photovoltaic panel (200) supplies electrical energy to the compressor (500), boiler (700), boiler circulation pump (800) and heat circulation pump (900) after voltage regulation by the inverter (1200).

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