A new ventilation structure for BIPV module

Abstract

The present application relates to a new ventilation structure for BIPV module, comprising a photovoltaic assembly matched with a building wall, the back of the photovoltaic assembly is installed on the facade of the building wall in parallel through a plurality of steel columns, a ventilation gap is formed between the photovoltaic assembly and the building wall, the bottom of the ventilation gap is transversely inserted with an air inlet channel for constituting a contraction air inlet, and the top is longitudinally inserted with an exhaust chimney as an air outlet. The present application modifies the air duct between the photovoltaic assembly and the building wall in a simple way, so that the natural convection in the ventilation gap can be accelerated to a high wind speed level similar to the forced convection condition, without any mechanical fan device, and the ventilation cooling of the BIPV module can be enhanced without increasing the power consumption. In addition, the improved ventilation structure of the present application can be easily realized without a large amount of installation work, and the related fixed cost is far lower than the modification of a single solar panel.

Description

Technical Field

[0001] This invention belongs to the field of building-integrated photovoltaics (BIPV) technology, and specifically relates to a new ventilation structure for BIPV modules. Background Technology

[0002] Building-integrated photovoltaics (BIPV) and its application of incorporating power generation devices into building components such as facades are rapidly expanding to achieve carbon neutrality. This technology not only fulfills building functions such as insulation and wind protection but also generates electricity. An example of a standard BIPV facade installation is... Figure 1 As shown in the figure, the photovoltaic module 3 is installed in the cladding of the building wall 1 above the ground 4, with an insulation layer 2 between them; it can be seen from the figure that there is no ventilation gap between the installed photovoltaic module and the building wall.

[0003] As is well known, photovoltaic (PV) modules convert light energy directly into electrical energy by absorbing light. Therefore, only a portion of the incident light is converted into electrical energy, while the remainder is converted into heat energy. Consequently, when a PV module is heated during operation, its power generation immediately decreases. This characteristic of PV modules is determined by the temperature coefficient T. k This coefficient describes the relative change in efficiency or electrical output (in %) with temperature (in K). For various PV modules, the temperature coefficient T... k The temperature coefficient varies considerably depending on the type of photovoltaic module. For example, Si-PV has a temperature coefficient of -0.4% / K, CdTe -0.28% / K, perovskite -0.08 to -0.18% / K, OPV -0.29 to -0.5% / K, and HJT -0.24% / K. For CIGS-based photovoltaic modules, a temperature coefficient of approximately -0.35% / K is typically achievable. For instance, as the temperature increases by 60K, the power generation of a CIGS BIPV module decreases by 21% compared to before. Typically, BIPV modules can be easily heated from room temperature to above 80°C in summer, and for very dark solar modules, it can even reach ~120°C at midday. In this way, the temperature of the photovoltaic module has a significant impact on its power conversion efficiency. In BIPV applications, the heating of solar modules typically depends on their specific mounting structure and the heat dissipation of the solar modules (including from the front and back). Therefore, if the heat emitted by the solar modules cannot be adequately dissipated, such as when there are no ventilation gaps between BIPV modules installed near the external wall insulation layer, high levels of heat will be generated. Therefore, cooling technology on photovoltaic modules plays a crucial role in maintaining the performance of the entire BIPV system.

[0004] Various methods for cooling solar modules are described in the prior art. (Olawole et al.) 1)2019 J.Phys.: Conf. Series. 1299 012020, introduces options for cooling solar modules. Therefore, either active or passive cooling methods can be used.

[0005] Active cooling relies on mechanical devices to pump liquid or gaseous media to cool solar modules installed in buildings. However, this requires a continuous supply of additional electricity to operate the mechanical cooling system. Consequently, the power used in the fans or pumps is deducted from the power generated by the solar modules, resulting in a reduction in the net power output of the solar modules.

[0006] For passive cooling, there is no additional cooling device for the solar panels; therefore, heat is passively released into the environment. Previous research on passively cooled photovoltaic modules has mainly focused on two main methods: using PCM (phase change material) or natural convection. Regarding PCM cooling, PCM materials are used to cool the photovoltaic panels by absorbing heat generated on them during the day. Then, at night, the heat absorbed by the PCM can be released into the environment. However, the use of PCM is mainly in the research stage, and reproducibility and performance consistency remain issues. Regarding natural convection cooling, as the name suggests, it involves cooling the solar panels using natural air. When the installed BIPV modules have ventilation gaps between the solar panels and the building walls, natural convection cooling can occur on both the front and back of the solar panels. Figure 2 As shown, BIPV modules with standard ventilation gaps 6 are installed on the building facade. The photovoltaic panels are fixed to the facade by steel columns 5, replacing the insulation layer 2. When airflow 7 travels towards the building at a certain speed, some of the airflow 7 flows into the ventilation gaps 6 and moves upwards. Therefore, the higher the air mass flow rate or air velocity, the greater the temperature drop that may occur on the PV modules. However, because various obstructions in the ventilation gaps 6 (such as the steel columns 5) reduce the air velocity within the ventilation gaps 6, the actual performance of the convective cooling process in the standard ventilation gaps will be reduced. Figure 6 As shown, heat can accumulate in the central area of ​​an installed solar module array. Therefore, this standard ventilation gap design needs to be modified to improve convective cooling of the BIPV modules.

[0007] To improve the convection cooling of ventilated BIPV modules, some methods have been employed, such as using an additional thin metal plate structure on the back of the photovoltaic module to increase the effective heat dissipation area. Figure 3As can be seen, segmented or conventional metal panels are mounted on the back of the solar panel to enhance convective cooling within the ventilation gaps. However, this additional, and even quite complex, structure significantly increases the BOM cost of each individual BIPV panel. Furthermore, the installation of such panels becomes more difficult, leading to higher installation costs. Therefore, in addition to modifying the standard ventilation gap design to improve BIPV cooling, the fixed costs of such modifications should also be considered from an economic perspective. Summary of the Invention

[0008] This invention addresses the shortcomings of existing technologies by providing a novel ventilation structure for BIPV modules. The aim is to enhance ventilation and cooling of BIPV modules and increase their power generation without increasing power consumption, while simultaneously ensuring low fixed costs and easy installation. The specific technical solution is as follows:

[0009] This invention provides a novel ventilation structure for BIPV modules, including photovoltaic modules adapted to the building wall. The back of the photovoltaic modules is mounted parallel to the exterior of the building wall via multiple steel columns. A ventilation gap is formed between the photovoltaic modules and the building wall. An air intake channel for forming a contracting air inlet is inserted laterally at the bottom of the ventilation gap, and an exhaust chimney serving as an air outlet is inserted longitudinally at the top of the gap.

[0010] As a preferred embodiment of the present invention, the top surface length L of the air intake channel is 0.5 to 2 m, and the opening height H of the air intake channel is 0.2 to 0.8 m; the width of the ventilation gap is less than 0.08 m, and the ratio of the opening height of the air intake channel to the width of the ventilation gap is 2.5 to 10.

[0011] As a preferred embodiment of the present invention, the air intake channel adopts a parallel structure design.

[0012] As a preferred embodiment of the present invention, the bottom surface of the air intake channel forms an angle of 20° to 70° with the ground at the bottom of the building wall.

[0013] As a preferred embodiment of the present invention, an air intake grille is provided at the end face of the opening of the air intake channel, and a plurality of through holes are provided on the air intake grille in an array. The longitudinal section of the through holes is a trumpet-shaped structure and narrows inward.

[0014] As a preferred embodiment of the present invention, the exhaust channel of the exhaust chimney adopts an enlarged exhaust port design, and the longitudinal section of the exhaust channel is a trumpet-shaped structure that narrows inward.

[0015] As a preferred embodiment of the present invention, the exhaust channel of the exhaust chimney adopts a semi-enlarged exhaust port design, and the longitudinal section of the exhaust channel is a semi-trumpet-shaped structure that narrows inward.

[0016] As a preferred embodiment of the present invention, a conical chimney cover is suspended above the top opening of the air outlet channel by a bracket.

[0017] As a preferred embodiment of the present invention, the height of the top surface of the inner straight wall of the air outlet channel is greater than the height of the top surface of its inner inclined wall.

[0018] As a preferred embodiment of the present invention, the photovoltaic module is provided with multiple additional air inlets that can form a contraction air inlet at equal intervals along the longitudinal direction.

[0019] As a preferred embodiment of the present invention, the distance between adjacent additional air inlets is 5 to 8 meters.

[0020] As a preferred embodiment of the present invention, the length of the additional air inlet is less than 0.1m, the port height of the additional air inlet is 0.2 to 0.4m, and the ratio of the port height of the additional air inlet to the width of the ventilation gap is 2.5 to 5.

[0021] As a preferred embodiment of the present invention, an air guide plate is provided at the bottom edge of the inner port of the additional air inlet, and the inclination angle of the air guide plate is 20° to 70°.

[0022] As a preferred embodiment of the present invention, the photovoltaic module is any one of the following: silicon solar module, copper indium gallium selenide thin-film solar module, cadmium telluride thin-film solar module, organic photovoltaic thin-film solar cell module, perovskite thin-film solar module, dye-sensitized solar cell module, and intrinsic heterojunction thin-film solar cell module.

[0023] The beneficial effects of this invention are:

[0024] This invention modifies the air duct between photovoltaic modules and building walls in a simple way by inserting an air intake channel that forms a converging air inlet and an exhaust chimney that serves as an air outlet. This allows natural convection in the ventilation gap to be accelerated to a high wind speed level similar to forced convection, but without any mechanical fan devices. This enhances the ventilation and cooling of the BIPV module without increasing power consumption. Therefore, the high air velocity along the ventilation gap significantly improves the cooling performance of the BIPV module and further increases its power generation. Furthermore, the improved ventilation structure of this invention can be easily implemented without extensive installation work, and the associated fixed costs are far lower than those for modifying a single solar panel, as the cost can be distributed across a large number of modules. Attached Figure Description

[0025] Figure 1 The standard BIPV installation facade without ventilation gaps is shown: a) macro view, b) bottom detail view;

[0026] Figure 2 The following diagram shows a BIPV installation on a facade with standard ventilation gaps: a) macro view, b) bottom detail view;

[0027] Figure 3 The diagram shows an a) segmented or b) conventional metal plate structure for additional mounting for convection cooling of the back of the solar module;

[0028] Figure 4 An embodiment of BIPV installation on a facade is shown, which improves ventilation by using a contracting air intake channel at the bottom of the building wall: a) macro view, b) bottom detail view;

[0029] Figure 5 An embodiment of BIPV installation on a facade is shown, which improves ventilation using narrow air intake channels at the base of the building walls and exhaust chimneys at the top: a) macro view, b) bottom detail view;

[0030] Figure 6 The diagram shows the temperature distribution of different BIPV installations based on simulation.

[0031] Figure 7 The simulation shows that, according to the data, the temperature of nine photovoltaic modules in different BIPV installations along the central axis increases with increasing height.

[0032] Figure 8 The simulation shows the air velocity in the ventilation gap along the central axis of the nine installed photovoltaic modules as the height increases for different BIPV installations.

[0033] Figure 9 The diagram illustrates repeated BIPV cooling of a high-rise building with additional air inlets using smaller air inlet channels on different floors: a) macro view, b) detailed illustration of the circles highlighted in a).

[0034] Figure 10 Two other embodiments of BIPV installation on the facade are shown, which improve ventilation by using contraction air intake channels at the bottom of the building walls: a) parallel air intake, b) secondary contraction air intake;

[0035] Figure 11 Two other embodiments of BIPV installation on the facade are shown, which improve ventilation using exhaust chimneys at the top of the building walls: a) enlarged vents, b) semi-enlarged vents.

[0036] The diagram shows: 1. Building wall; 2. Insulation layer; 3. Photovoltaic module; 4. Ground; 5. Steel column; 6. Ventilation gap; 7. Airflow; 8. Air intake channel; 9. Opening; 10. Air intake grille; 11. Exhaust chimney; 12. Air outlet channel; 13. Support frame; 14. Chimney cover; 15. Additional air inlet; 16. Port; 17. Air guide vane. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0038] like Figure 4 and 5 As shown, a new ventilation structure for BIPV modules includes photovoltaic modules 3 adapted to a building wall 1. The back of the photovoltaic modules 3 is installed parallel to the exterior of the building wall 1 by multiple steel columns 5. A ventilation gap 6 is formed between the photovoltaic modules 3 and the building wall 1. An air intake channel 8 for forming a contraction air intake is inserted horizontally at the bottom of the ventilation gap 6, and an exhaust chimney 11 for serving as an air outlet is inserted vertically at the top of the gap.

[0039] By adopting the above technical solution, the new ventilation structure modifies the air duct between the photovoltaic module 3 and the building wall 1 in a simple way. By inserting an air intake channel 8 to form a converging air inlet and an exhaust chimney 11 as an air outlet, the natural convection in the ventilation gap 6 can be accelerated to a high wind speed level similar to that of forced convection, but without any mechanical fan device. This enhances the ventilation and cooling of the BIPV module without increasing power consumption. Therefore, the high air velocity along the ventilation gap 6 can significantly improve the cooling performance of the BIPV module and further increase its power generation. In addition, the improved ventilation structure can be easily implemented without a lot of installation work, and the associated fixed costs are far lower than those for modifying a single solar panel, as the cost can be distributed among a large number of modules.

[0040] The air intake channel 8 works in conjunction with the ventilation gap 6 to form a constricted air intake, which can increase the air volume flow rate and effectively prevent the air from flowing around when it is directed toward the building's cladding. Most of the airflow 7 that naturally enters the air intake channel 8 is forced and deflected toward the ventilation gap 6, thereby giving the ventilation gap 6 a higher air velocity.

[0041] The airflow 7 in the exhaust chimney 11 is heated by the solar thermal effect. Since the warm air naturally flows upward, it exerts a "pull" effect on the remaining airflow 7 in the ventilation gap 6. In this way, the air speed behind the three solar panels on the top of the photovoltaic module 3 can be increased. Therefore, the convective cooling performance of this area can be further enhanced.

[0042] like Figure 4 As shown, the top surface length L of the air intake channel 8 is 0.5 to 2 m, and the opening height H of the air intake channel 8 is 0.2 to 0.8 m; the width of the ventilation gap 6 is less than 0.08 m, and the ratio of the opening height of the air intake channel 8 to the width of the ventilation gap 6 is 2.5 to 10.

[0043] By adopting the above technical solution, the ratio of the height of the opening 9 of the air intake channel 8 to the width of the ventilation gap 6 should always be greater than 2.5 in order to construct a constricted air intake. In this invention, this ratio is set to 2.5 to 10. These values ​​can be changed according to the structure of different BIPV modules, and the width of the opening 9 of the air intake channel 8 can be proportionally varied according to the facade width of the building wall 1.

[0044] like Figure 10 As shown, the air intake channel 8 adopts a parallel structure design.

[0045] By adopting the above technical solution, the air intake channel 8 has a parallel air inlet, a simple structural design, and low manufacturing cost.

[0046] like Figure 4 As shown, the bottom surface of the air intake channel 8 forms an angle of 20° to 70° with the ground 4 located at the bottom of the building wall 1.

[0047] By adopting the above technical solution, when natural air enters the opening 9 of the constricted air intake channel 8, the air volume flow rate will increase several times according to the restricted geometry. The constricted air inlet design will effectively prevent air from flowing around when it is directed toward the building cladding, thereby forcing a larger portion of the airflow 7 to be deflected toward the ventilation gap 6. Therefore, the large airflow through the small inlet will result in a much higher air velocity in the ventilation gap 6, which can further improve the cooling performance of the BIPV module.

[0048] like Figure 10 As shown, an air intake grille 10 is sealed at the end face of the opening 9 of the air intake channel 8. The air intake grille 10 has multiple through holes arranged in an array. The longitudinal section of the through holes is a trumpet-shaped structure and narrows inward.

[0049] By adopting the above technical solution, the air intake grille 10 with a horn-shaped through hole can form a secondary contraction air inlet, which can further control the direction and speed of air flow, thereby better improving the cooling performance of the BIPV module.

[0050] like Figure 11 As shown, the exhaust channel 12 of the exhaust chimney 11 adopts an enlarged air outlet design, and the longitudinal section of the exhaust channel 12 is a trumpet-shaped structure that narrows inward.

[0051] By adopting the above technical solution, the air outlet channel 12 adopts an enlarged air outlet design, which can further increase the "pull" effect, increase the airflow speed 7, and thus improve the cooling performance of the top area of ​​the photovoltaic module 3.

[0052] like Figure 11 As shown, the exhaust channel 12 of the exhaust chimney 11 adopts a semi-enlarged air outlet design, and the longitudinal section of the exhaust channel 12 is a semi-trumpet-shaped structure that narrows inward.

[0053] By adopting the above technical solutions, the air outlet channel 12 adopts a semi-enlarged air outlet design and the above-mentioned enlarged outlet design. These are different due to the airflow 7, or the gradually enlarged air outlet design can be used to further increase the "pull" effect, increase the airflow 7 speed, and thus improve the cooling performance of the top area of ​​the photovoltaic module 3.

[0054] like Figure 5 and 11 As shown, a conical chimney cover 14 is suspended above the top opening of the air outlet 12 via a bracket 13.

[0055] By adopting the above technical solution, the chimney cover 14 is designed as a cone-shaped structure to prevent fallen leaves from blocking the ventilation gap 6, which allows fallen leaves, rain, snow and other debris to slide off quickly.

[0056] like Figure 11 As shown, the height of the top surface of the inner straight wall of the air outlet channel 12 is greater than the height of the top surface of its inner inclined wall.

[0057] By adopting the above technical solution, the airflow 7 in the air outlet channel 12 can be diverted to one side to further increase the speed of the airflow 7, and it can also replace one side of the support 13 to play a supporting role.

[0058] like Figure 9 As shown, the photovoltaic module 3 has multiple additional air inlets 15 that can form a contraction air inlet, which are opened longitudinally at equal intervals.

[0059] By adopting the above technical solution, from Figure 7 and Figure 8As can be seen, the effect of convective cooling decreases with increasing building height. Therefore, the ventilation temperature at the converging air inlet of intake channel 8 increases, and the associated air velocity decreases. To address this issue, additional air inlets 15, which form converging air inlets, can be repeatedly installed between different floors. These additional air inlets 15 can accelerate the air velocity within the ventilation gap 6 by introducing more airflow, thereby enhancing the cooling of photovoltaic modules 3 installed on higher floors of the building. It is important to note that all of these new conceptual designs are not cost-intensive and do not require additional power consumption.

[0060] like Figure 9 As shown, the distance between adjacent additional air inlets 15 is 5 to 8 meters.

[0061] By adopting the above technical solution, such installation can be repeated for floors of high-rise buildings, for example, an additional air inlet can be set up every 5 to 8 meters.

[0062] like Figure 9 As shown, the length of the additional air inlet 15 is less than 0.1m, the height of the port 16 of the additional air inlet 15 is 0.2 to 0.4m, and the ratio of the height of the port 16 of the additional air inlet 15 to the width of the ventilation gap 6 is 2.5 to 5.

[0063] By adopting the above technical solution, the above data are typical dimensions of the additional air inlet 15, which can form a small constricted air inlet to further accelerate the cooling air speed.

[0064] like Figure 9 As shown, the bottom edge of the inner port 16 of the additional air inlet 15 is provided with an air guide 17 inclined upward, and the inclination angle of the air guide 17 is 20° to 70°.

[0065] By adopting the above technical solution, in order to force the additional airflow to move upward, a guide vane 17 with an inclination angle of 20° to 70° is used; since the connection between the additional air inlet 15 and the ventilation gap 6 is half open, the air downstairs can still flow upward.

[0066] like Figure 5 As shown, the photovoltaic module 3 is any one of the following: silicon solar module, copper indium gallium selenide thin-film solar module, cadmium telluride thin-film solar module, organic photovoltaic thin-film solar cell module, perovskite thin-film solar module, dye-sensitized solar cell module, and intrinsic heterojunction thin-film solar cell module.

[0067] It should be noted that by adopting the above technical solutions, all types of BIPV modules on the market can adopt this new improved ventilation method, such as various silicon solar modules, copper indium gallium selenide (CIGS) thin-film solar modules, cadmium telluride (CdTe) thin-film solar modules, organic photovoltaic (OPV) thin-film solar cell modules, perovskite thin-film solar modules, dye-sensitized solar cell (DSSC) modules, and intrinsic heterojunction thin-film (HJT) solar cell modules.

[0068] Relevant test results:

[0069] Figure 6 The simulation results of the temperature field mapping of the BIPV panel using a converging air inlet are shown. Therefore, we set the simulation boundary conditions as follows: ambient temperature 20°C (RT), BIPV modules as standard black CIGS panels, 3x3 standard CIGS BIPV modules (length ~1.6m, width ~0.65m) from the commercial market as one simulation matrix unit, peripheral wind speed 4m / s (a light breeze at Beaufort level 2), then directed into the ventilation structure, and solar radiation 1000W / m² (solar radiation in most parts of the Earth is 700–1300W / m²). 2 (e.g., midday on a sunny day). For most BIPV application cases, such boundary conditions should be representative. For example... Figure 6 As shown, there is no ventilation gap between all nine solar panels. Figure 1 ) and standard ventilation gaps (see Figure 2 Compared to the case of using a constricted air intake ( ), Figure 4 The temperature field of the 3x3 PV module matrix was significantly reduced. Only the temperature of the top three panels was slightly higher than that of the remaining six panels. This indicates that, with the help of the contracted air inlet, the weakened effect of convective cooling can be released through high-speed air infiltration. However, this effect was not completely eliminated. To further improve the cooling performance of the installed BIPV modules, especially the top three panels, an exhaust chimney 11 was added to the air outlet of the ventilation gap 6 (e.g., Figure 5 (As shown).

[0070] Figure 7 The display shows that in all four BIPV module installation configurations, there is no ventilation gap ( Figure 1 ), standard ventilation gap (see Figure 2 ), ventilation with contraction air inlet ( Figure 4 Ventilation and exhaust chimney structure with compressed air inlet ( Figure 5The temperature of the installed solar panels along the central axis varies with the building height, allowing for a clearer quantitative representation of their temperature distribution. It's important to note that the temperature drops at heights of approximately 2.1m and 3.7m are caused by the installation gaps between the solar panels at the short-side leading edge. It can be seen that the improved air ventilation concept using contracting inlets and exhaust chimneys effectively reduces the temperature of the solar panels by 20–50K compared to a standard ventilation gap design; that is, for CIGS solar modules (Tk = -0.35% / K), this can appropriately achieve an 8–20% increase in power generation. Compared to solar panels using only contracting inlets, the solar panels using the contracting inlet and exhaust chimney structure also clearly show the additional enhanced cooling (2–10K) for the top three solar panels.

[0071] Figure 8 Three BIPV module installation configurations and standard ventilation gaps are shown. Figure 2 ), ventilation with contraction air inlet ( Figure 4 ), ventilation and air outlet exhaust chimney structure with constricted air inlet ( Figure 5 The improved air ventilation concept, employing a contracting inlet and exhaust chimney structure, significantly increases the air velocity behind the solar panels by 5–47 m / s compared to a standard ventilation gap design, taking into account the wind speed distribution along the central axis of the installed solar panels and the increased building height. This effectively improves convective cooling performance. Furthermore, compared to solar panels with only contracting inlets on the top three panels, the solar panels using a contracting inlet and exhaust chimney structure increase the wind speed by 1–3 m / s.

[0072] like Figure 7 and Figure 8 As shown, the effect of convective cooling decreases with building height. Therefore, the ventilation temperature increases and the associated air velocity decreases in buildings with converging air inlets. To address this problem, the converging air inlet configuration can be arranged in a repeating manner according to the present invention, i.e., an additional air inlet 15 (e.g., Figure 9 (As shown).

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A novel ventilation structure for a BIPV module, comprising a photovoltaic module (3) adapted to a building wall (1), wherein the back of the photovoltaic module (3) is mounted parallel to the exterior surface of the building wall (1) via a plurality of steel columns (5), and a ventilation gap (6) is formed between the photovoltaic module (3) and the building wall (1), characterized in that: The bottom of the ventilation gap (6) is horizontally provided with an air intake channel (8) for forming a contracted air inlet, and the top of it is vertically provided with an exhaust chimney (11) as an air outlet. The bottom surface of the air intake channel (8) forms an angle of 20° to 70° with the ground (4) at the bottom of the building wall (1); The photovoltaic module (3) has multiple additional air inlets (15) that can form a contraction air inlet, which are opened longitudinally at equal intervals. The inner port (16) of the additional air inlet (15) is provided with an air guide (17) at an angle upward, and the angle of the air guide (17) is 20°~70°.

2. A novel ventilation structure for BIPV modules according to claim 1, characterized in that: The top surface length L of the air intake channel (8) is 0.5~2m, and the height H of the opening (9) of the air intake channel (8) is 0.2~0.8m; the width of the ventilation gap (6) is less than 0.08m, and the ratio of the height of the opening (9) of the air intake channel (8) to the width of the ventilation gap (6) is 2.5~10.

3. A novel ventilation structure for BIPV modules according to claim 1, characterized in that: The air intake channel (8) adopts a parallel structure design.

4. A novel ventilation structure for BIPV modules according to claim 1, characterized in that: An air intake grille (10) is sealed at the end face of the opening (9) of the air intake channel (8). The air intake grille (10) has multiple through holes arranged in an array. The longitudinal section of the through holes is a trumpet-shaped structure and narrows inward.

5. A novel ventilation structure for BIPV modules according to claim 1, characterized in that: The exhaust channel (12) of the exhaust chimney (11) adopts an enlarged air outlet design. The longitudinal section of the exhaust channel (12) is a trumpet-shaped structure and narrows inward.

6. A novel ventilation structure for BIPV modules according to claim 1, characterized in that: The exhaust channel (12) of the exhaust chimney (11) adopts a semi-enlarged air outlet design. The longitudinal section of the exhaust channel (12) is a semi-trumpet-shaped structure and narrows inward.

7. A novel ventilation structure for a BIPV module according to claim 5 or 6, characterized in that: A conical chimney cover (14) is suspended above the top opening of the air outlet channel (12) via a bracket (13).

8. A novel ventilation structure for a BIPV module according to claim 6, characterized in that: The height of the top surface of the inner straight wall of the air outlet channel (12) is greater than the height of the top surface of its inner inclined wall.

9. A novel ventilation structure for a BIPV module according to claim 1, characterized in that: The distance between adjacent additional air inlets (15) is 5~8m.

10. A novel ventilation structure for a BIPV module according to claim 1, characterized in that: The length of the additional air inlet (15) is less than 0.1m, the height of the port (16) of the additional air inlet (15) is 0.2~0.4m, and the ratio of the height of the port (16) of the additional air inlet (15) to the width of the ventilation gap (6) is 2.5~5.

11. A novel ventilation structure for a BIPV module according to claim 1, characterized in that: The photovoltaic module (3) is any one of the following: silicon solar module, copper indium gallium selenide thin film solar module, cadmium telluride thin film solar module, organic photovoltaic thin film solar cell module, perovskite thin film solar module, dye-sensitized solar cell module, and intrinsic heterojunction thin film solar cell module.

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