A photovoltaic-photothermal assembly

Abstract

The application discloses a photovoltaic light heat assembly, which comprises a solar cell assembly and a flow channel box, the flow channel box is fixed below the solar cell assembly, the flow channel box is respectively provided with a flow channel inlet and a flow channel outlet on two sides, a plurality of baffles are arranged in the flow channel box, the baffles are arranged at intervals from the flow channel inlet to the flow channel outlet, a plurality of baffle strips are arranged below the baffles, the baffle strips are arranged at intervals along the extension direction of the baffles, the baffle strips are fixedly connected with the bottom surface of the flow channel box, and the baffles and the bottom surface of the flow channel box form gaps through the baffle strips. The photovoltaic light heat assembly has high temperature uniformity, the heat exchange effect is more uniform, and the temperature uniformity is improved.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic and solar thermal technology, and more particularly to a photovoltaic and solar thermal module. Background Technology

[0002] Solar energy, as a green new energy source, boasts numerous advantages, including inexhaustibility and cleanliness. Photovoltaics, as a crucial form of solar energy utilization, involves solar cells. In engineering applications, only 5%-20% of solar energy is converted into electricity, while nearly 60%-70% is converted into heat. Therefore, the concept of integrated photovoltaic and solar thermal (PV / T) technology was proposed. This technology, as a comprehensive method of solar energy utilization, recovers the waste heat generated during solar cell power generation through heat exchange channels, reducing the temperature of the solar cells, improving their efficiency, and enabling combined heat and power (CHP).

[0003] Because PV / T technology aligns with the second law of thermodynamics and the concept of energy cascade utilization, it boasts high solar energy utilization efficiency and economic benefits, attracting extensive research from scholars worldwide. Inspired by the advantage of reducing solar cell temperature while recovering heat, its combination with concentrated solar power (PV) technology has also garnered significant attention due to its practical feasibility. Related research indicates that under non-concentrated conditions, the temperature uniformity of solar cells already impacts the overall output performance of solar cell modules, and long-term operation can lead to stress deformation and reduce module lifespan. Under concentrated conditions, the characteristics of the concentrator and the significantly increased irradiance received by the solar panel surface cause high temperatures and more uneven temperature distribution, resulting in a more significant impact on module output performance and lifespan. Therefore, low temperature uniformity severely affects the operation of photovoltaics and its derivative, PV / T.

[0004] Currently, the heat exchange channel design for photovoltaic (PV) thermal modules is mainly divided into tubular and box-type. Tubular channels, due to their small inner diameter, are prone to clogging during heat exchange, causing slow or stagnant flow in the blocked areas, leading to localized heat accumulation and severely affecting temperature uniformity. Furthermore, to achieve large-area contact with the solar panel, the tubular channel design is complex, resulting in a long flow path for the heat exchange fluid, further exacerbating the flow obstruction. Box-type heat exchange channel designs are less common and are generally straight-through, meaning the fluid flows only once. As the temperature of the heat exchange fluid gradually increases, the temperature difference between the fluid and the solar cell decreases, significantly reducing the heat transfer coefficient and resulting in low temperature uniformity. Summary of the Invention

[0005] The purpose of this invention is to provide a photovoltaic thermal module that makes the heat exchange effect more uniform and improves the temperature uniformity.

[0006] The technical solution adopted by the photovoltaic thermal module disclosed in this invention is: A photovoltaic thermal module includes a solar cell module and a flow channel box. The flow channel box is fixed below the solar cell module. The flow channel box has a flow channel inlet and a flow channel outlet on both sides. The flow channel box has a plurality of baffles arranged at intervals from the flow channel inlet to the flow channel outlet. A plurality of baffle strips are arranged below the baffles at intervals along the extension direction of the baffles. The baffle strips are fixedly connected to the bottom surface of the flow channel box, and the baffles form gaps with the bottom surface of the flow channel box through the baffle strips.

[0007] As a preferred embodiment, the flow channel box has a skirt on the edge near the solar cell module, and a sealing groove is formed on the surface of the skirt, with a sealing ring inside the sealing groove.

[0008] As a preferred embodiment, several of the baffles are connected end to end by connecting blocks to form a continuous "S" shaped structure. The connecting blocks are set parallel to the baffle, and the baffle has a slot corresponding to the baffle. The baffle is secured above the baffle through the slot.

[0009] As a preferred embodiment, the upper end of the baffle is spaced apart from the solar cell module.

[0010] As a preferred embodiment, the flow channel box is provided with buffer cavities corresponding to the flow channel inlet and the flow channel outlet, and the buffer cavities are respectively connected to the flow channel inlet and the flow channel outlet.

[0011] The beneficial effects of the photovoltaic thermal module disclosed in this invention are as follows: the flow channel box is directly and fixedly connected to the back of the solar cell module. Heat exchange fluid is introduced through the flow channel inlet and discharged from the flow channel outlet, allowing the heat exchange fluid to circulate within the flow channel box. Compared to traditional tubular flow channels, this results in a larger contact area with the solar cell module and better heat exchange performance. Several baffles are installed inside the flow channel box, with several baffle strips below the baffles. The baffle strips are fixedly connected to the bottom surface of the flow channel box, and the baffles form gaps with the bottom surface of the flow channel box through the baffle strips. The cross-sectional arrangement of the baffles and baffle strips further enhances the heat exchange effect. The design significantly enhances the turbulence of the heat exchange fluid, thereby increasing the heat transfer coefficient and strengthening the heat transfer effect. It also enhances the mixing degree of the fluid, improves the temperature uniformity of the heat exchange fluid, and further improves the temperature uniformity of the solar cell module. Furthermore, by dividing the solar cell module into individual areas, the heat exchange fluid is deflected into a small section of the solar cell module area after heat exchange with the deflected fluid and flows out through the outlet channel. This reduces the average flow path of the heat exchange fluid, making the heat exchange effect more uniform and improving the temperature uniformity. Attached Figure Description

[0012] Figure 1 This is an exploded view of a photovoltaic thermal module according to the present invention.

[0013] Figure 2 This is a front view of the flow channel box of a photovoltaic thermal module according to the present invention.

[0014] Figure 3 yes Figure 2 Sectional view of AA.

[0015] Figure 4 yes Figure 2 A cross-sectional view of BB.

[0016] Figure 5 This is a schematic diagram of the internal baffle of the flow channel box of a photovoltaic thermal module according to the present invention. Detailed Implementation

[0017] The present invention will be further described and illustrated below with reference to specific embodiments and the accompanying drawings: Please refer to Figures 1 to 4 A photovoltaic thermal module includes a solar cell module 10 and a flow channel box 20. The flow channel box 20 is fixed below the solar cell module 10. The flow channel box 20 has a flow channel inlet 21 and a flow channel outlet 22 on both sides. The flow channel box 20 has a plurality of baffles 23. The baffles 23 are spaced apart from the flow channel inlet 21 to the flow channel outlet 22. The baffles 24 are spaced apart below the baffles 23. The baffles 24 are fixedly connected to the bottom surface of the flow channel box 20. The baffles 23 form a gap with the bottom surface of the flow channel box 20 through the baffles 24.

[0018] The flow channel box 20 is directly fixedly connected to the back of the solar cell module 10. The heat exchange fluid is introduced through the flow channel inlet 21 and discharged from the flow channel outlet 22, so that the heat exchange fluid in the flow channel box 20 can circulate. Compared with the traditional tubular flow channel, the contact area between the flow channel box 20 and the solar cell module 10 is larger, and the heat exchange effect is better.

[0019] Several baffles 23 are provided inside the flow channel box 20, and several baffles 24 are provided below the baffles 23. The baffles 24 are fixedly connected to the bottom surface of the flow channel box 20. The baffles 23 form a gap with the bottom surface of the flow channel box 20 through the baffles 24. The cross design of the baffles 23 and baffles 24 can significantly improve the turbulence of the heat exchange fluid, thereby improving the heat transfer coefficient of the heat exchange fluid, enhancing the heat transfer effect, and enhancing the mixing degree of the fluid, improving the temperature uniformity of the heat exchange fluid, and further improving the temperature uniformity of the solar cell module 10.

[0020] Furthermore, the solar cell module 10 is divided into individual areas. Under the action of the baffle 23 and the baffle strip 24, the heat exchange fluid exchanges heat with a small section of the solar cell module 10 area and then flows out through the heat exchange fluid outlet channel from the outlet 22. This reduces the average flow rate of the heat exchange fluid, making the heat exchange effect more uniform and improving the temperature uniformity.

[0021] In the above scheme, the flow channel box 20 has a skirt 25 on the edge near the solar cell module 10, and a sealing groove 26 is opened on the surface of the skirt 25. A sealing ring 30 is provided inside the sealing groove 26.

[0022] The skirt 25 provides a support for the installation of the sealing ring 30. During installation and use, the solar cell module 10 on the flow channel box 20 can apply pressure to the sealing ring 30, thereby squeezing the sealing ring 30 and sealing the gap between the flow channel box 20 and the solar cell module 10, thus improving the sealing performance. On the other hand, when the solar cell module 10 is installed separately, it will be tightened by a pressure block. The flow channel box 20 and the solar cell module 10 are independent of each other, and the pressure block for installing the solar cell module 10 separately can provide pre-tightening force.

[0023] Please refer to Figure 5 Several baffles 24 are connected end-to-end via connecting blocks 27 to form a continuous "S"-shaped structure. The connecting blocks 27 are parallel to the baffles 23, and the baffles 23 have corresponding slots on the baffles 24, allowing them to be secured above the baffles 24. The connecting blocks 27 obstruct the flow of heat exchange fluid along the baffles 24, disrupting the continuous flow of the heat exchange fluid. There is a gap between the upper end of the baffle and the solar cell module 10, allowing the heat exchange fluid to flow from the upper end of the baffle 23 while preventing contact between the baffle 23 and the solar cell module 10, thus avoiding interference with heat dissipation.

[0024] In this design, the heat exchange fluid flow direction is divided into longitudinal and transverse directions. Figure 5 The dotted lines represent the flow lines of the cold fluid. Due to gravity and the action of the baffles, some of the cold fluid flows through the flow lines. Figure 4 The lateral flow shown transforms into a hot fluid after heat exchange with the solar cells, following the adjacent... Figure 5 The short horizontal lines represent the outflow lines of the hot fluid. For example... Figure 4 As shown, the change in the direction of the heat exchange fluid caused by the partition creates a jet-like effect in the contact area with the solar cell, which can be used to enhance the heat exchange efficiency.

[0025] The flow box 20 is provided with a buffer chamber 28 corresponding to the flow inlet 21 and the flow outlet 22. The buffer chamber 28 is connected to the flow inlet 21 and the flow outlet 22 respectively, so that when the heat exchange fluid flows into the flow box 20 again, it first enters the buffer chamber 28 and then enters along the baffle 24 from a uniformly dispersed position.

[0026] This invention provides a photovoltaic thermal module where a flow channel box is directly and fixedly connected to the back of the solar cell module. Heat exchange fluid is introduced through the flow channel inlet and discharged through the flow channel outlet, allowing for fluid circulation within the flow channel box. Compared to traditional tubular flow channels, this provides a larger contact area with the solar cell module, resulting in better heat exchange. The flow channel box contains several baffles, with several baffle strips below each baffle. The baffle strips are fixedly connected to the bottom surface of the flow channel box, creating gaps between the baffles and the bottom surface. This cross-design of the baffles and baffle strips significantly increases the turbulence of the heat exchange fluid flow, thereby increasing the heat transfer coefficient, enhancing the heat exchange effect, and improving fluid mixing and temperature uniformity, further improving the temperature uniformity of the solar cell module. Furthermore, the solar cell module is divided into individual areas. Under the action of the baffles and baffle strips, the heat exchange fluid exchanges heat with a small section of the solar cell module area before being redirected to the heat exchange fluid outlet channel, reducing the average flow path of the heat exchange fluid and making the heat exchange effect more uniform, thus improving temperature uniformity.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A photovoltaic thermal module, characterized in that, The device includes a solar cell module and a flow channel box. The flow channel box is fixed below the solar cell module. A flow channel inlet and a flow channel outlet are respectively located on both sides of the flow channel box. Several baffles are provided inside the flow channel box, spaced apart from the flow channel inlet to the flow channel outlet. Several baffle strips are provided below the baffles, spaced apart along the extension direction of the baffles. The baffle strips are fixedly connected to the bottom surface of the flow channel box. A gap is formed between the baffles and the bottom surface of the flow channel box through the baffle strips. Several baffle strips are connected end-to-end by connecting blocks to form a continuous "S"-shaped structure. The connecting blocks are parallel to the baffles. A slot is provided on each baffle corresponding to a baffle strip, and the baffle is secured above the baffle strip through the slot. A buffer cavity is provided in the flow channel box corresponding to the flow channel inlet and the flow channel outlet, respectively. The buffer cavity is connected to the flow channel inlet and the flow channel outlet.

2. A photovoltaic thermal module as described in claim 1, characterized in that, The flow channel box has a skirt on the edge near the solar cell module, and a sealing groove is formed on the surface of the skirt, with a sealing ring inside the sealing groove.

3. A photovoltaic thermal module as described in claim 1, characterized in that, There is a gap between the upper end of the baffle and the solar cell module.

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