Photovoltaic-photothermal assembly branch pipe

Abstract

The utility model discloses a photovoltaic photo-thermal component support pipe, including support pipe body and the heat transfer wall of extension setting along its generatrix direction, the heat transfer wing is provided with to the heat transfer wall and the heat transfer wing continuous setting along the axial direction of support pipe body, the heat transfer wall is away from the one side of support pipe body and is constituted for the heat transfer plane that is used for with photovoltaic photo-thermal component back surface adhesion. The utility model discloses the support pipe and the backboard traditional line contact heat in photovoltaic photo-thermal component is improved for surface contact heat, increased contact area, reduced thermal resistance to improve the heat dissipation efficiency and light heat comprehensive utilization performance.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic and solar thermal equipment technology, specifically to a branch pipe for a photovoltaic and solar thermal module. Background Technology

[0002] Photovoltaic-Thermal (PVT) technology is a comprehensive solar energy utilization technology that combines photovoltaic power generation with solar thermal utilization. This technology simultaneously achieves photoelectric conversion and solar thermal collection in the same device, overcoming the impact of the solar thermal effect on photoelectric conversion efficiency while also generating heat energy, thereby improving the overall utilization efficiency of solar energy.

[0003] In the construction of a typical PVT module, the collector, as a key thermal management component, is usually composed of multiple parallel branch pipes connected to a manifold with a large cross-sectional size at both ends. The branch pipes are bonded to the metal heat-conducting plate on the back of the photovoltaic module with thermally conductive adhesive to collect the waste heat of the photovoltaic cells.

[0004] Traditional branch pipe structures employ a cylindrical design, resulting in a geometrically typical line contact with the metal backsheet. This contact pattern leads to a very limited actual heat conduction area between the two components, with the majority of heat being conducted through the thermally conductive adhesive filling the gaps. However, the thermal conductivity of the adhesive itself is far lower than that of the metal material, creating additional thermal resistance. Consequently, this results in low heat flux density and poor heat transfer efficiency, hindering the rapid and uniform reduction of the photovoltaic cell backsheet temperature and, to some extent, limiting further improvements in the overall performance of the PVT system. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a branch pipe for photovoltaic thermal modules.

[0006] To achieve the above objectives, the technical solution provided by the present invention is as follows.

[0007] A photovoltaic thermal module branch pipe includes a branch pipe body. A heat transfer wall is provided extending along the generatrix direction of the branch pipe body. On the cross-section of the branch pipe body, a heat transfer wing is provided on the side of the heat transfer wall near the branch pipe body. The wall thickness of the heat transfer wall is similar to that of the branch pipe body. The heat transfer wall and the heat transfer wing are continuous along the axial direction of the branch pipe body. The side of the heat transfer wall away from the branch pipe body is constructed as a heat transfer plane.

[0008] Preferably, the thickness of the collector formed by the branch pipe and its corresponding manifold is greater than or equal to the outer diameter of the branch pipe.

[0009] Preferably, the wall thickness of the branch pipe is equal to the wall thickness of the heat transfer wall.

[0010] As a preferred technical solution, the heat transfer fin has an arc-shaped or straight cross-section and a wedge-shaped structure sandwiched between the branch pipe body and the heat transfer wall. The two ends of the arc-shaped or straight structure are tangentially connected to the outer side of the branch pipe body and the side of the heat transfer wall close to the branch pipe body, respectively.

[0011] As a preferred technical solution, the branch pipe body, heat transfer wall, and heat transfer fins are integrated into a single connected structure.

[0012] As a preferred technical solution, multiple branch pipe bodies are arranged in a branch pipe array in a manner that is parallel to each other axially, and the heat transfer walls between adjacent branch pipe bodies in the branch pipe array extend towards each other and are connected as one.

[0013] As a preferred technical solution, a thin plate is provided on the side of the heat transfer wall between adjacent branch pipe bodies in the branch pipe array away from the branch pipe.

[0014] As a preferred technical solution, a heat dissipation wall is also provided on the side of the branch pipe array away from the heat transfer wall, and the heat dissipation wall and the heat transfer wall are arranged symmetrically with respect to the axis of the branch pipe body.

[0015] As a preferred technical solution, a heat transfer bracket is provided between the heat dissipation wall and the heat transfer wall. The heat transfer bracket connects the heat dissipation wall and the heat transfer wall. The heat transfer bracket is disposed between two adjacent branch pipe bodies. The connection between the heat transfer bracket and the heat dissipation wall and / or the heat transfer wall adopts a rounded corner for smooth transition.

[0016] As a preferred technical solution, the heat transfer support and the heat transfer wall are perpendicular to each other on the cross-section of the branch pipe body.

[0017] As a preferred technical solution, both the branch pipe body and the heat transfer wall are made of aluminum profiles.

[0018] As a preferred technical solution, the thickness of the branch pipe body and / or heat transfer wall is between 0.8mm and 1.2mm.

[0019] As a preferred technical solution, the inner diameter of the branch pipe body is between 6mm and 10mm.

[0020] As a preferred technical solution, the parallel spacing between two adjacent branch pipe bodies in the branch pipe array is 50mm-100mm.

[0021] The advantages and beneficial effects of this invention are as follows: a heat transfer wall extending along the busbar of the branch pipe body is added, and the end of the heat transfer wall forms a wide heat transfer plane. This plane can achieve stable and large-area close contact with the metal backsheet of the photovoltaic module, improving the heat transfer mode from inefficient "line contact" to "surface contact", thereby improving thermal conductivity and reducing contact thermal resistance.

[0022] The heat transfer fins connecting the branch pipe body and the heat transfer wall, with their arc-shaped and wedge-shaped transition structure, not only ensure smooth and low-resistance heat flow from the branch pipe body to the heat transfer wall, but also form a continuous and complete internal heat conduction channel through integrated connection with the branch pipe body and the heat transfer wall, avoiding heat loss caused by multiple materials and interfaces in traditional structures. This improves the photothermal collection efficiency while also effectively ensuring the cooling effect of the photovoltaic cells. Furthermore, compared to coating the outside of a circular branch pipe, the heat transfer plane of this invention allows for the use of significantly less thermally conductive adhesive. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the branch pipe shown in this utility model; Figure 2 This is a schematic diagram of the cross-sectional structure of the branch pipe shown in this utility model; Figure 3 This is a schematic cross-sectional view of one embodiment of the branch pipe shown in this utility model; Figure 4 This is a schematic cross-sectional view of another embodiment of the branch pipe shown in this utility model; Figure 5 This is a cross-sectional structural schematic diagram of another embodiment of the branch pipe shown in this utility model; Figure label: 1-Branch body, 2-Heat transfer wall, 3-Heat transfer wing, 4-Heat transfer plane, 5-Arc or straight structure, 6-Wedge structure, 7-Heat dissipation wall, 8-Heat transfer support, 9-Thin plate. Detailed Implementation

[0024] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0025] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0026] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly or implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0027] Please see Figures 1-4 This embodiment provides a photovoltaic thermal module branch pipe, including a branch pipe body 1, which extends along a busbar (with... Figure 2 (The gray circle on the top indicates the cross-section of the busbar) A heat transfer wall 2 is provided extending in the direction of the branch pipe body 1. On the cross-section of the branch pipe body 1, a heat transfer wing 3 is provided on the side of the heat transfer wall 2 closest to the branch pipe body 1. The heat transfer wall 2 and the heat transfer wing 3 are continuously arranged along the axial direction of the branch pipe body 1. The side of the heat transfer wall 2 away from the branch pipe body 1 is constructed to form a heat transfer plane 4 for bonding with the back of the photovoltaic thermal module. The branch pipe body 1 serves as a fluid channel, and heat is collected from the heat transfer wall 2 to the branch pipe body 1 through the heat transfer wing 3. The heat transfer plane 4 and the photovoltaic backsheet are fully bonded together using thermally conductive adhesive. This improves the traditional "line contact" heat transfer to a highly efficient "surface contact" heat transfer, increases the heat conduction area, reduces contact thermal resistance, and thus improves heat dissipation efficiency and the comprehensive utilization performance of photovoltaic thermal energy.

[0028] In order to optimize the heat conduction path from the branch pipe body 1 to the heat transfer wall 2 and ensure structural strength, the technical solution provided in this embodiment includes that the heat transfer wing 3 has an arc-shaped or straight structure 5 in its cross-section and a wedge-shaped structure 6 sandwiched between the branch pipe body 1 and the heat transfer wall 2. The two ends of the arc-shaped or straight structure 5 are tangentially connected to the outer side of the branch pipe body 1 and the side of the heat transfer wall 2 near the branch pipe body 1, respectively.

[0029] Specifically, the arc or straight structure 5 provides a smooth heat conduction path, and the wedge structure 6 enhances the stability of the connection. When heat flows through the heat transfer wing 3, the heat transfer wing 3 reduces the flow resistance, which not only ensures the smooth transfer of heat from the heat transfer wall 2 to the branch pipe body 1, but also improves the connection stability. At the same time, it is beneficial to the extrusion molding of aluminum profiles.

[0030] To further reduce interfacial thermal resistance and improve production efficiency and structural integrity, the technical solution provided in this embodiment includes an integral connection structure of the branch pipe body 1, the heat transfer wall 2, and the heat transfer wing 3.

[0031] Specifically, when the branch pipe has a continuous structure, it can be achieved by extrusion molding to obtain aluminum profiles with completely consistent cross-sections. This allows the branch pipe body 1 to form a continuous and complete metal heat conduction channel, completely eliminating the contact thermal resistance at the connection of different components, simplifying the production process, and ensuring product consistency.

[0032] It should be noted that the branch pipe body 1 and the heat transfer wall 2 are integrally connected structures, but their combination with the heat transfer wall 2 can be a non-integral connection structure. The heat transfer wall 2 is preferably made of the same material as the branch pipe body 1 to avoid or reduce the thermal expansion and contraction caused by the difference in thermal expansion coefficients between different materials.

[0033] To construct a collector unit suitable for large-area photovoltaic modules, the technical solution provided in this embodiment includes multiple branch pipe bodies 1 arranged in a parallel axial direction to form a branch pipe array. The heat transfer walls 2 between adjacent branch pipe bodies 1 extend towards each other and are connected as a single unit. The heat transfer walls 2 of adjacent branch pipes are fused into a continuous heat absorption plate. This allows multiple branch pipes to jointly support and uniformly collect heat from the entire photovoltaic backsheet area, avoiding localized overheating and achieving uniform and efficient collection of battery waste heat.

[0034] It should be noted that, considering that the heat transfer walls 2 of adjacent branch pipes are fused into a continuous heat absorption plate, the thickness of the heat transfer wall using extruded aluminum profiles needs to be limited to a certain extent, typically greater than 0.8 mm, for example, 1 mm, to facilitate forming. In the embodiment provided by the present invention, a thin plate 9 is provided on the side of the heat transfer wall 2 between adjacent branch pipe bodies in the branch pipe array away from the branch pipe. The thin plate 9 and the branch pipe body 1 can optionally be constructed as separate components. At this time, the thin plate can still have a heat transfer effect while its wall thickness can be thinner, for example, as thin as 0.3 mm, which improves heat transfer efficiency and saves material costs.

[0035] Furthermore, the split-type branch pipe body 1 and the thin plate 9 can be bonded together with thermally conductive adhesive.

[0036] In order to enhance the heat dissipation capacity of the branch array under specific environments and achieve double-sided heat exchange, the technical solution provided in this embodiment includes that the branch array is further provided with a heat dissipation wall 7 on the side away from the heat transfer wall 2, and the heat dissipation wall 7 and the heat transfer wall 2 are symmetrically arranged with respect to the axis of the branch body 1.

[0037] Specifically, the heat dissipation wall 7 can be added according to the geographical location of the photovoltaic and solar thermal modules. For example, in areas with low latitude and high ambient temperature, it is necessary to enhance heat dissipation through natural or forced convection between the heat dissipation wall 7 and the air. The heat dissipation wall 7 provides additional heat dissipation area for the branch pipes and can be selected according to the operating conditions, thereby improving the adaptability of the modules to ambient temperature.

[0038] To increase the structural stability of the branch pipe array and provide internal thermal support, the technical solution provided in this embodiment includes a heat transfer bracket 8 disposed between the heat dissipation wall 7 and the heat transfer wall 2. The heat transfer bracket 8 connects the heat dissipation wall 7 and the heat transfer wall 2, and is disposed between two adjacent branch pipe bodies 1. The connection between the heat transfer bracket 8 and the heat dissipation wall 7 and / or the heat transfer wall 2 is smoothly transitioned with rounded corners. Structurally, the heat transfer bracket 8 connects the heat dissipation wall 7 and the heat transfer wall 2, forming a stable truss; the rounded corner transition avoids stress concentration; this structure enhances the compressive and deformation resistance of the branch pipe array, while the heat transfer bracket 8 itself can also serve as an auxiliary heat conduction channel, promoting a balanced distribution of heat between the heat transfer wall 2 and the heat dissipation wall 7.

[0039] In order to optimize the stress on the heat transfer bracket 8 and simplify the design of the profile extrusion die, the technical solution provided in this embodiment includes that the heat transfer bracket 8 and the heat transfer wall 2 are perpendicular to each other on the cross-section of the branch pipe body 1.

[0040] Specifically, the vertical arrangement allows the heat transfer bracket 8 to withstand the pressure from the plane of the heat transfer wall 2 most effectively; at the same time, the right-angled geometry is easier to achieve during mold processing and profile extrusion, which helps to ensure production quality and control costs.

[0041] To balance excellent thermal conductivity, lightweight design, and corrosion resistance, the technical solution provided in this embodiment includes aluminum profiles for both the branch pipe body 1 and the heat transfer wall 2. Aluminum has high thermal conductivity, low density, and good atmospheric corrosion resistance; using aluminum profiles enables lightweight component design, and complex cross-sections can be formed in one step using a mature extrusion process.

[0042] To achieve a balance between ensuring pressure resistance and minimizing material usage, the technical solution provided in this embodiment includes a wall thickness ranging from 0.8 mm to 1.2 mm for the branch pipe body 1 and / or the heat transfer wall 2. Specifically, the cross-section of the main channel can be a flat tube or similar design. Considering that photovoltaic thermal modules should be able to withstand pressures (hydrostatic pressure) of 1.6 MPa or higher according to relevant standards, a circular cross-section is preferred to save material costs and reduce production difficulty. Within this wall thickness range, the circular cross-section of the branch pipe body 1 can reliably withstand the system's operating pressure, while the heat transfer wall 2 also possesses sufficient rigidity and thermal conductivity, achieving optimization of performance and economy.

[0043] To optimize the thermal and hydraulic performance of the solar collector and make rational use of materials, the technical solution provided in this embodiment includes a parallel spacing of 50mm-100mm between two adjacent branch pipe bodies 1 in the branch pipe array. This spacing range ensures that the heat transfer wall 2 can fully cover the photovoltaic backsheet, avoiding uncooled "hot spots"; at the same time, it also ensures the uniformity of fluid distribution among the parallel branch pipes and keeps the pressure drop of the entire solar collector within a reasonable range.

[0044] The working principle of this invention is as follows: When a photovoltaic cell generates waste heat during operation, the heat is first conducted to its metal backplate. The heat transfer plane 4 of the branch pipe in this invention achieves a large-area, tight fit with the backplate using thermally conductive adhesive, efficiently capturing this heat. The heat enters the heat transfer wall 2 through the heat transfer plane 4, and then smoothly and with low resistance, converges onto the wall of the branch pipe body 1, which serves as a fluid channel, through the heat transfer fins 3 with optimized transition shapes. The heat exchange medium (such as water or antifreeze) flowing inside the branch pipe body 1 continuously carries away the heat from the pipe wall, thereby achieving active cooling of the photovoltaic cell and improving its power generation efficiency. The heated medium is then utilized as useful heat energy output.

[0045] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A photovoltaic thermal module branch pipe, comprising a branch pipe body (1), characterized in that, The branch pipe body (1) is provided with a heat transfer wall (2) extending along the generatrix direction. On the cross-section of the branch pipe body (1), a heat transfer wing (3) extends from the side of the branch pipe body (1) close to the heat transfer wall (2). The heat transfer wall (2) and the heat transfer wing (3) are continuously arranged along the axial direction of the branch pipe body (1). The side of the heat transfer wall (2) away from the branch pipe body (1) is constructed as a heat transfer plane (4) for contacting the back of the photovoltaic thermal module.

2. The photovoltaic thermal module branch pipe according to claim 1, characterized in that, The heat transfer wing (3) has an arc-shaped or straight cross-section (5) and a wedge-shaped structure (6) sandwiched between the branch pipe body (1) and the heat transfer wall (2).

3. The photovoltaic thermal module branch pipe according to claim 1, characterized in that, The heat transfer wing (3) has an arc-shaped or straight structure (5) in its cross-section. The two ends of the arc-shaped or straight structure (5) are tangentially connected to the outer side of the branch pipe body (1) and the side of the heat transfer wall (2) near the branch pipe body (1), respectively.

4. The photovoltaic thermal module branch pipe according to any one of claims 1-3, characterized in that, The branch pipe body (1), the heat transfer wall (2), and the heat transfer wing (3) are an integrally connected structure.

5. The photovoltaic thermal module branch pipe according to claim 1, characterized in that, Multiple branch pipe bodies (1) are arranged in a parallel manner along the axis to form a branch pipe array, and a thin plate (9) is provided on the side of the heat transfer wall between adjacent branch pipe bodies away from the branch pipe in the branch pipe array.

6. The photovoltaic thermal module branch pipe according to claim 1, characterized in that, Multiple branch pipe bodies (1) are arranged in a parallel manner along the axis to form a branch pipe array, and the heat transfer walls (2) between adjacent branch pipe bodies (1) in the branch pipe array extend towards each other and are connected as one.

7. The photovoltaic thermal module branch pipe according to claim 5, characterized in that, The branch array is integrally connected to the thin plate (9).

8. The photovoltaic thermal module branch pipe according to claim 6, characterized in that, The branch pipe array is further provided with a heat dissipation wall (7) on the side away from the heat transfer wall (2), and the heat dissipation wall (7) and the heat transfer wall (2) are arranged symmetrically with respect to the axis of the branch pipe body (1).

9. The photovoltaic thermal module branch pipe according to claim 8, characterized in that, A heat transfer bracket (8) is provided between the heat dissipation wall (7) and the heat transfer wall (2). The heat transfer bracket (8) connects the heat dissipation wall (7) and the heat transfer wall (2). The heat transfer bracket (8) is provided between two adjacent branch pipe bodies (1). The connection between the heat transfer bracket (8) and the heat dissipation wall (7) and / or the heat transfer wall (2) is smooth with rounded corners. The heat transfer bracket (8) and the heat transfer wall (2) are perpendicular to each other.

10. The photovoltaic thermal module branch pipe according to claim 1, characterized in that, The branch pipe body (1) and the heat transfer wall (2) are made of aluminum profiles; the wall thickness of the branch pipe body (1) and / or the heat transfer wall (2) ranges from 0.5 mm to 1.5 mm; the inner diameter of the branch pipe body (1) is from 6 mm to 10 mm, and the parallel spacing between two adjacent branch pipe bodies (1) in the branch pipe array is from 50 mm to 100 mm.

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