Solar cogeneration cell panel with long-time heat storage function and method of using the same

Abstract

The application relates to a solar heat and power cogeneration cell panel with a long-time heat storage function and a use method thereof, which comprises a support, a heat storage box body is obliquely installed on the support, and a solar cell panel is attached and installed on the oblique side surface of the upper portion of the heat storage box body; a serpentine heat exchange pipe is installed in the heat storage box body, the upper portion of the serpentine heat exchange pipe is inclined towards the direction close to the solar cell panel, the lower portion of the serpentine heat exchange pipe is inclined towards the direction away from the solar cell panel, and the serpentine heat exchange pipe is arranged in a structure with a sparse upper portion and a dense lower portion from top to bottom; and the heat storage box body is filled with a phase change heat storage material; the stable supercooling characteristics of the sodium acetate trihydrate composite phase change heat storage material are effectively utilized, invalid heat energy generated by the solar cell panel can be reliably and stably stored for a long time, the solar cell panel can be operated under a lower temperature condition, the electric energy production efficiency of the solar cell panel is improved and guaranteed, and the electric energy and heat energy of the solar cell panel can be utilized.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic panel technology, and in particular to a solar cogeneration panel with long-term thermal storage function and its usage method. Background Technology

[0002] In recent years, with technological advancements and cost reductions, solar photovoltaic (PV) power generation has been widely adopted. Currently, PV power generation has become one of the major energy supply methods worldwide, and an increasing number of countries and regions are developing the solar PV power generation industry to promote the use of renewable energy, reduce dependence on fossil fuels, and achieve sustainable energy development.

[0003] Power generation efficiency and equipment lifespan are two major concerns in the field of solar photovoltaic power generation. The lifespan and power generation efficiency of solar panels are related to light conditions, operating temperature, cleanliness, shading, maintenance and upkeep, as well as the quality and process of photovoltaic cells. Among these factors, the operating temperature of the solar panel is the biggest influencing factor. Excessive temperature will cause the voltage of the photovoltaic cells to drop, resulting in power loss and thus reducing power generation efficiency. It will also accelerate the aging of materials in the photovoltaic cells, shorten the lifespan of the cells, and cause resource waste.

[0004] Therefore, controlling the temperature of photovoltaic solar panels to improve solar power generation efficiency and storing the resulting heat energy to further enhance solar energy utilization has become an important research topic in the field of solar power generation.

[0005] Northwest my country possesses abundant solar energy resources, but due to the significant diurnal temperature range—high daytime temperatures and low nighttime temperatures—improving the power generation efficiency of conventional photovoltaic (PV) panels is crucial. Typically, the photoelectric conversion efficiency of solar panels during operation is only 15%–20%. A large portion of the unused solar radiation is absorbed by the panels and converted into heat, leading to increased cell temperature, reduced power generation efficiency, and a shortened lifespan for the solar panels. Summary of the Invention

[0006] To address the aforementioned issues, this invention provides a solar cogeneration panel with a reasonable structure and long-term heat storage function, along with its usage method. This allows for the storage of excess heat from the solar panel for thermal energy storage, effectively extending the lifespan of the solar panel, improving and ensuring power generation efficiency, realizing the dual utilization of electrical and thermal energy from the solar panel, and significantly improving the overall solar energy utilization rate of the device.

[0007] The technical solution adopted in this invention is as follows:

[0008] A solar cogeneration panel with long-term thermal storage function includes a support frame, on which a thermal storage box is installed at an angle, and a solar panel is attached to the upper inclined side of the thermal storage box; a serpentine heat exchange tube is installed inside the thermal storage box, with the upper part of the serpentine heat exchange tube inclined towards the solar panel and the lower part inclined away from the solar panel, and the serpentine heat exchange tube is arranged in a structure with a sparse upper part and a dense lower part; the thermal storage box is filled with a phase change thermal storage material.

[0009] As a further improvement to the above technical solution:

[0010] The serpentine heat exchange tube includes multiple horizontally arranged, parallel tubes. The ends of adjacent tubes are connected to form a serpentine meandering structure in the same plane. The free end of the uppermost tube extends toward the side wall of the heat storage tank to form a heat exchange inlet. The free end of the lowermost tube is bent and connected to a straight tube section. The end of the straight tube section is bent toward the heat storage tank to form a water outlet. The water outlet extends from the heat exchange outlet on the side wall of the heat storage tank.

[0011] The heat exchange inlet and heat exchange outlet are located at the same height in the heat storage box.

[0012] The serpentine heat exchange tube is divided into three regions from top to bottom. The number of tubes in the middle region is greater than that in the upper region, and the number of tubes in the lower region is greater than that in the middle region.

[0013] The phase change thermal storage material is a sodium acetate trihydrate composite phase change thermal storage material with stable supercooling characteristics, a phase change temperature of 53-58℃, and a phase change latent heat of 200-215kJ / kg. The stored phase change latent heat can be stored for a long time at room temperature or low temperature.

[0014] The heat storage box has spare space inside to accommodate volume changes in the phase change heat storage material.

[0015] The upper end of the serpentine heat exchange tube is 5cm away from the solar panel, and the lower end of the serpentine heat exchange tube is 5cm away from the bottom surface of the heat storage box. The heat storage box is a rectangular, sealed stainless steel shell, and the thickness of the wall of the heat storage box that is in contact with the solar panel is less than 0.2mm.

[0016] The top of the heat storage box is equipped with a delivery port.

[0017] The inner wall of the heat storage box is equipped with an inwardly extending support base, and the support base is provided with an inwardly concave arc-shaped structure for supporting and assembling the serpentine heat exchange tube.

[0018] A method for using a solar cogeneration panel with long-term thermal storage function includes the following steps:

[0019] When in operation, the solar panel converts solar energy into electrical energy. At the same time, the heat generated by the solar panel and the heat energy brought by sunlight are absorbed by the phase change heat storage material in the heat storage box that is attached to the solar panel, and the heat is stored in the form of latent heat of phase change.

[0020] When there is a clear heat demand, sodium acetate trihydrate crystal particles are delivered into the heat storage box through the delivery port, triggering the solidification of the supercooled phase change heat storage material and fully releasing the stored latent heat of phase change.

[0021] At extremely high temperatures, if the phase change thermal storage material reaches the preset temperature value, a low-temperature fluid is introduced into the serpentine heat exchange tube through the heat exchange inlet to quickly transfer the heat to the outside in an active cooling manner, so as to maintain the temperature within a safe range.

[0022] At low temperatures, the heat stored in the phase change thermal storage material is conducted in the reverse direction to the solar panel.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] This invention has a compact and reasonable structure. By effectively utilizing the stable supercooling characteristics of phase change thermal storage materials, it can reliably and stably store the ineffective heat energy generated by solar panels for a long period of time. This not only maintains the operation of solar panels under lower temperature conditions to improve and ensure their power production efficiency, but also realizes the utilization of both electrical and thermal energy from solar panels, significantly improving the overall solar energy utilization rate of the device.

[0025] The present invention also includes the following advantages:

[0026] In practical use, the solar cogeneration panel of this application can output only electrical energy during the day, while storing thermal energy internally; when there is no electrical energy output at night, it can output the internally stored thermal energy, thereby decoupling the electrical and thermal energy output of the solar cogeneration panel and achieving the time-sharing output function of electrical and thermal energy.

[0027] In this invention, the upper end of the serpentine heat exchange tube is inclined towards the solar panel, while the lower end is inclined away from the solar panel. This helps to achieve heat exchange of the phase change heat storage material at the bottom of the heat storage box, away from the solar panel, and also helps to achieve heat exchange in the dead corner formed at the top of the heat storage box, near the solar panel.

[0028] In this invention, the serpentine heat exchange tubes are arranged in a structure with sparse upper and dense lower sections to effectively solve the problem of poor heat exchange caused by factors such as gravity, thereby achieving accelerated heat exchange. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention.

[0030] Figure 2 This is an exploded view of the present invention.

[0031] Figure 3 This is a schematic diagram of the layout of the serpentine heat exchange tubes inside the heat storage box of the present invention.

[0032] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0033] Figure 5 This is a schematic diagram showing the serpentine heat exchange tubes of the present invention arranged in a sparse upper and dense lower configuration within the heat storage tank.

[0034] The components include: 1. bracket; 2. thermal storage box; 3. serpentine heat exchange tube; 4. solar panel; 5. support base;

[0035] 21. Heat exchange inlet; 22. Feed port; 23. Heat exchange outlet;

[0036] 31. Straight pipe part; 32. Water outlet;

[0037] 51. Concave arc-shaped structure. Detailed Implementation

[0038] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0039] like Figure 1 , Figure 2 and Figure 3 As shown, a solar cogeneration panel with long-term thermal storage function in this embodiment includes a support 1, a thermal storage box 2 installed at an angle on the support 1, and a solar panel 4 attached to the inclined side of the upper part of the thermal storage box 2; a serpentine heat exchange tube 3 is installed inside the thermal storage box 2, the upper part of the serpentine heat exchange tube 3 is inclined towards the solar panel 4, and the lower part of the serpentine heat exchange tube 3 is inclined away from the solar panel 4, and the serpentine heat exchange tube 3 is arranged in a structure with a sparse upper part and a dense lower part from top to bottom; the thermal storage box 2 is filled with phase change thermal storage material.

[0040] In this embodiment, by effectively utilizing the stable subcooling characteristics of phase change thermal storage materials, the ineffective heat energy generated by the solar panel 4 can be reliably and stably stored for a long period of time. This not only maintains the operation of the solar panel 4 under lower temperature conditions to improve and ensure its power production efficiency, but also realizes the utilization of both electrical and thermal energy from the solar panel 4.

[0041] In this embodiment, the upper end of the serpentine heat exchange tube 3 is inclined toward the solar panel 4, and the lower end is inclined away from the solar panel 4. This helps to realize the heat exchange of the phase change heat storage material at the bottom of the heat storage box 2 away from the solar panel 4, and also helps to realize the heat exchange in the dead corner formed at the top of the heat storage box 2 near the solar panel 4.

[0042] The phase change heat storage material filled in the heat storage tank 2 will undergo a solid-liquid phase change. Under the influence of factors such as gravity, the solid will move downward and the liquid will move upward. In order to ensure sufficient heat exchange, the serpentine heat exchange tube 3 is arranged in a structure with a sparse top and a dense bottom to effectively solve the problem of poor heat exchange caused by factors such as gravity and achieve accelerated heat exchange at the bottom.

[0043] like Figure 2 and Figure 5 As shown, the serpentine heat exchange tube 3 includes multiple horizontally arranged, parallel tubes. The ends of adjacent tubes are connected to form a serpentine meandering structure in the same plane. The free end of the uppermost tube extends toward the side wall of the heat storage tank 2 to form a heat exchange inlet 21. The free end of the lowermost tube is bent and connected to a straight tube section 31. The end of the straight tube section 31 is bent toward the heat storage tank 2 to form a water outlet 32. The water outlet 32 ​​extends from the heat exchange outlet 23 on the side wall of the heat storage tank 2. Heat exchange is achieved in the heat storage tank 2 by circulating low-temperature liquid into the serpentine heat exchange tube 3.

[0044] The heat exchange inlet 21 and the heat exchange outlet 23 are located at the same height in the heat storage box 2, which facilitates the layout and installation of external heat exchange devices.

[0045] The serpentine heat exchange tube 3 is divided into three regions from top to bottom. The number of tubes in the middle region is greater than that in the upper region, and the number of tubes in the lower region is greater than that in the middle region.

[0046] In one embodiment, such as Figure 5 As shown, the number of tubes in the upper region (Ⅰ) can be set to three, the number of tubes in the middle region (Ⅱ) to six, and the number of tubes in the lower region (Ⅲ) to nine, thereby meeting the requirements for the arrangement of the serpentine heat exchange tubes 3 in the heat storage box 2.

[0047] The phase change thermal energy storage material is a sodium acetate trihydrate composite phase change thermal energy storage material with stable subcooling characteristics. The phase change temperature is 53-58℃ and the latent heat of phase change is 200-215kJ / kg. The stored latent heat of phase change can be stored for a long time at room temperature or low temperature.

[0048] In this embodiment, when using the stable supercooling properties of sodium acetate trihydrate for long-term heat storage, the stored latent heat of phase change can be stored for a long time at room temperature or low temperature.

[0049] The heat storage box 2 has spare space inside to accommodate the volume change of the phase change heat storage material, so as to adapt to the volume change of the phase change heat storage material during phase change.

[0050] The upper end of the serpentine heat exchange tube 3 is 5cm away from the solar panel 4, and the lower end of the serpentine heat exchange tube 3 is 5cm away from the bottom of the inner surface of the heat storage box 2. The heat storage box 2 is a rectangular sealed stainless steel shell, and the thickness of the wall of the heat storage box 2 that is in contact with the solar panel 4 is less than 0.2mm to ensure rapid heat transfer between the solar panel 4 and the heat storage box 2 on the front side.

[0051] In this embodiment, the heat storage box 2 is tilted at a preset angle relative to the ground, and the serpentine heat exchange tube 3 is tilted at the same preset angle relative to the heat storage box 2, thereby realizing and ensuring that the upper end of the serpentine heat exchange tube 3 faces closer to the solar panel 4, and the lower end of the serpentine heat exchange tube 3 faces closer to the bottom surface of the heat storage box 2.

[0052] In actual production and use, the heat storage box 2 can be tilted at a 40° angle relative to the ground to ensure reliable energy absorption of the solar panel 4. At the same time, the serpentine heat exchange tube 3 in the heat storage box 2 can be tilted at a 45° angle relative to the ground in the same direction to reduce or even avoid heat exchange dead zones, effectively improving and ensuring sufficient heat exchange.

[0053] The front door of the thermal storage box 2 can be fixedly connected to the solar panel 4 via multiple screws and fasteners.

[0054] The top of the thermal storage box 2 is provided with a delivery port 22, through which phase change thermal storage material crystals are delivered into the thermal storage box 2.

[0055] like Figure 4 As shown, an inwardly extending support base 5 is installed on the inner wall of the heat storage box 2. The support base 5 is provided with a concave arc-shaped structure 51 for supporting and assembling the serpentine heat exchange tube 3, so that the serpentine heat exchange tube 3 maintains a stable and reliable structural layout in the heat storage box 2.

[0056] In practical use, the solar cogeneration panel of this application can output only electrical energy during the day, while storing thermal energy internally; when there is no electrical energy output at night, it can output the internally stored thermal energy, thereby decoupling the electrical and thermal energy output of the solar cogeneration panel and achieving the time-sharing output function of electrical and thermal energy.

[0057] When external heat is needed, sodium acetate trihydrate crystal particles are introduced into the heat storage tank 2, which can trigger the solidification process of the supercooled phase change heat storage material inside the heat storage tank 2, thereby realizing the controllable release of the stored latent heat of phase change.

[0058] The method of using the solar cogeneration battery panel with long-term thermal storage function in this embodiment includes the following steps:

[0059] In operation, the solar panel 4 converts solar energy into electrical energy. At the same time, the heat generated by the solar panel 4 and the heat energy brought by sunlight are absorbed by the phase change heat storage material in the heat storage box 2 that is attached to the solar panel 4, and the heat is stored in the form of latent heat of phase change.

[0060] When there is a clear heat demand, sodium acetate trihydrate crystal particles are delivered into the heat storage box 2 through the delivery port 22, triggering the solidification of the supercooled phase change heat storage material and fully releasing the stored latent heat of phase change.

[0061] At extreme high temperatures, if the phase change thermal storage material reaches a preset temperature value, such as above 85°C, a low-temperature fluid is introduced into the serpentine heat exchange tube 3 through the heat exchange inlet 21 to actively cool the heat and quickly transfer it to the outside to maintain the temperature within a safe range. At the same time, the heat extracted by the serpentine heat exchange tube 3 can be delivered to external users for use.

[0062] At low temperatures, the heat stored in the phase change thermal storage material is conducted in the reverse direction to the solar panel 4.

[0063] Under extreme low temperature conditions, such as when the temperature of the phase change thermal storage material is below -30℃, the supercooled phase change thermal storage material will actively initiate a spontaneous solidification process, actively release the latent heat of phase change stored in the supercooled phase change thermal storage material, and transfer the heat to the front-end solar panel 4, thereby increasing the temperature of the front-end solar panel 4 and reducing the impact of the low temperature environment on the solar panel 4.

[0064] In this embodiment, when the solar panel 4 is in the normal temperature range or the low temperature range at night, the phase change thermal storage material 8 can store all the heat generated by the solar panel 4 and the heat brought by sunlight, thus realizing the long-term thermal storage function.

[0065] In practical use, compared with existing solar panels, this invention has at least the following characteristics:

[0066] 1) Long-term phase change thermal energy storage technology is adopted. When the solar panel 4 is working, the phase change thermal energy storage material absorbs the excess heat generated by the solar panel, thereby reducing the operating temperature of the solar panel. The phase change thermal energy storage material used changes from solid to liquid when the temperature is above its melting point, but can remain in a liquid state and enter a supercooled state when the temperature is below its melting point.

[0067] The phase change thermal energy storage material used is sodium acetate trihydrate composite phase change thermal energy storage material, which has significant stable subcooling characteristics. Its melting point is 53-58℃. This material can maintain a stable subcooled state at room temperature for a long time, storing heat in the form of latent heat of phase change. When there is a clear heat demand, the device can initiate the solidification process of the subcooled phase change thermal energy storage material by introducing sodium acetate trihydrate crystal particles, thus fully releasing the stored latent heat of phase change.

[0068] 2) Under extreme high temperature conditions, when the temperature of the phase change thermal storage material reaches 85°C, the excess heat is quickly transferred to the outside of the device by introducing a low-temperature heat exchange fluid into the serpentine heat exchange tube through active cooling, so as to maintain the temperature of the entire device within a safe range and prevent overheating from reducing the service life and power generation efficiency of the solar panels.

[0069] 3) Under low-temperature conditions, the heat stored in the phase change thermal storage material will be conducted back to the solar panel, reducing the impact of the low-temperature environment on the solar panel.

[0070] 4) During nighttime and other periods of heat load, the latent heat of phase change stored in the phase change thermal storage material can be released according to user needs, and the heat can be output through heat exchange fluid to meet the user's heat load.

[0071] This invention cleverly utilizes the supercooling characteristics of phase change thermal storage materials to achieve the utilization of both electrical and thermal energy from solar panels, significantly improving the overall solar energy utilization rate of the device.

[0072] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0073] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A solar cogeneration battery panel with long-term thermal storage function, comprising a support frame (1), characterized in that: A heat storage box (2) is installed at an angle on the support (1), and a solar panel (4) is attached to the inclined side of the upper part of the heat storage box (2); a serpentine heat exchange tube (3) is installed inside the heat storage box (2), the upper part of the serpentine heat exchange tube (3) is inclined towards the solar panel (4), and the lower part of the serpentine heat exchange tube (3) is inclined away from the solar panel (4), and the serpentine heat exchange tube (3) is arranged in a structure with a sparse upper part and a dense lower part from top to bottom; the heat storage box (2) is filled with phase change heat storage material; The serpentine heat exchange tube (3) includes multiple horizontally arranged, parallel tubes. The ends of adjacent tubes are connected to form a serpentine meandering structure in the same plane. The free end of the uppermost tube extends toward the side wall of the heat storage box (2) to form a heat exchange inlet (21). The free end of the lowermost tube is bent and connected to a straight tube section (31). The end of the straight tube section (31) is bent toward the heat storage box (2) to form a water outlet (32). The water outlet (32) extends from the heat exchange outlet (23) on the side wall of the heat storage box (2). The phase change thermal storage material is a sodium acetate trihydrate composite phase change thermal storage material with stable supercooling characteristics, a phase change temperature of 53~58℃, and a phase change latent heat of 200~215kJ / kg. The stored phase change latent heat can be stored for a long time at room temperature or low temperature.

2. The solar cogeneration panel with long-term thermal storage function as described in claim 1, characterized in that: The heat exchange inlet (21) and the heat exchange outlet (23) are located at the same height of the heat storage box (2).

3. The solar cogeneration panel with long-term thermal storage function as described in claim 1, characterized in that: The serpentine heat exchange tube (3) is divided into three regions from top to bottom. The number of tubes in the middle region is greater than the number of tubes in the upper region, and the number of tubes in the lower region is greater than the number of tubes in the middle region.

4. The solar cogeneration panel with long-term thermal storage function as described in claim 1, characterized in that: The heat storage box (2) has a spare space for the volume change of the phase change heat storage material.

5. The solar cogeneration panel with long-term thermal storage function as described in claim 1, characterized in that: The distance between the upper end of the serpentine heat exchange tube (3) and the solar panel (4) is 5cm, and the distance between the lower end of the serpentine heat exchange tube (3) and the bottom surface of the heat storage box (2) is 5cm. The heat storage box (2) is a closed stainless steel shell with a cuboid structure, and the thickness of the wall of the heat storage box (2) that is in contact with the solar panel (4) is less than 0.2mm.

6. The solar cogeneration panel with long-term thermal storage function as described in claim 1, characterized in that: The top of the heat storage box (2) is provided with a delivery port (22).

7. The solar cogeneration panel with long-term thermal storage function as described in claim 1, characterized in that: The inner wall of the heat storage box (2) is equipped with an inwardly extending support seat (5), and the support seat (5) is provided with an inwardly concave arc-shaped structure (51) for supporting and assembling the serpentine heat exchange tube (3).

8. A method of using a solar cogeneration battery panel with long-term thermal storage function as described in claim 1, characterized in that: Includes the following steps: In operation, the solar panel (4) converts solar energy into electrical energy. The heat generated by the solar panel (4) and the heat energy brought by sunlight are absorbed by the phase change heat storage material in the heat storage box (2) that is attached to the solar panel (4), and the heat is stored in the form of latent heat of phase change. When there is a clear heat demand, sodium acetate trihydrate crystal particles are delivered into the heat storage box (2) through the delivery port (22), triggering the solidification of the supercooled phase change heat storage material and fully releasing the stored latent heat of phase change. At extreme high temperatures, if the phase change thermal storage material reaches the preset temperature value, a low-temperature fluid is introduced into the serpentine heat exchange tube (3) through the heat exchange inlet (21) to quickly transfer the heat to the outside in an active cooling manner, so as to maintain the temperature within a safe range. At low temperatures, the heat stored in the phase change thermal storage material is conducted in reverse to the solar panel (4).

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