Novel Ventilation Structure for BIPV Modules

Abstract

This application relates to a novel ventilation structure for BIPV modules. The novel ventilation structure for BIPV modules includes a photovoltaic module adapted to the wall body of a building. The back surface of the photovoltaic module is installed parallel to the facade of the wall body of the building via a plurality of steel columns. A ventilation gap is formed between the photovoltaic module and the wall body of the building. In the lowest part of the ventilation gap, an intake passage for forming a reduced-diameter intake port is horizontally inserted, and in the uppermost part, an exhaust chimney as an exhaust port is vertically inserted. This application can simply modify the air passage between the photovoltaic module and the wall body of the building in a simple manner. Thereby, without the need for a mechanical fan device, the natural convection in the ventilation gap can be accelerated to a high wind speed level similar to that in the case of forced convection, and the ventilation and cooling of the BIPV module can be enhanced without increasing power consumption. Furthermore, the improved ventilation structure according to this application can be easily realized without requiring many installation operations. Also, the related fixed costs are much lower than those in the case of modifying a single solar panel.

Description

Technical Field

[0001] The present invention belongs to the technical field of building-integrated solar power generation, and particularly relates to a novel ventilation structure for BIPV modules.

Background Art

[0002] In order to achieve carbon neutrality, the application of manufacturing building structural members such as building-integrated solar power generation (BIPV) and its facade as power generation devices has been rapidly expanding. This technology can not only realize building functions such as heat insulation and wind prevention, but also generate electricity. An example of a standard BIPV facade installation is shown in FIG. 1. The solar power generation module 3 is installed in the covering layer of the wall body 1 of the building above the ground 4, and a heat insulation layer 2 is installed therebetween. As can be seen from the figure, there is no ventilation gap between the installed solar power generation module and the wall body of the building.

[0003] As is well known, a solar power generation module directly converts light energy into electrical energy by absorbing light. Therefore, only a part of the incident light is converted into electrical energy, and the rest is converted into heat energy. Therefore, when the solar power generation module is heated during operation, its power generation amount immediately decreases. This characteristic of the PV module is represented by the temperature coefficient T k which represents the relative change (unit: %) of the efficiency or electrical output with respect to the temperature (unit: K). For various PV modules, the temperature coefficient T kIt greatly depends on their types. For example, the temperature coefficient of Si-PV is -0.4% / K, CdTe is -0.28% / K, perovskite is -0.08~-0.18% / K, OPV is -0.29~-0.5% / K, and HJT is -0.24% / K. In the case of CIGS-based photovoltaic modules, usually, a temperature coefficient of about -0.35% / K can be achieved. For example, when the temperature rises by 60K, the power generation of CIGS BIPV modules can be reduced by 21% compared with the conventional ones. Usually, BIPV modules can generate heat from room temperature to over 80°C in summer, and in the case of extremely hot solar modules, they can even generate heat up to 120°C at noon. Thus, the temperature of photovoltaic modules has a great impact on their power conversion efficiency. In BIPV applications, the heat generation of solar modules usually depends on their specific installation structure and the heat dissipation of solar modules (including both from the front and the back). Therefore, if the heat emitted from solar modules cannot be sufficiently dissipated, such as when there is no ventilation gap between BIPV modules installed near the heat insulation layer of the outer wall, a high level of heat will be generated. Therefore, the cooling technology in photovoltaic modules plays an important role in maintaining the performance of the entire BIPV system.

[0004] Various methods for cooling solar modules have been described in the prior art. Olawole et al. 1) In 2019 J. Phys.: Conf. Ser. 1299 012020, options for cooling solar modules were introduced. Therefore, an active cooling method or a passive cooling method can be used.

[0005] The active cooling method is a method of cooling a solar module installed in a building by pumping a liquid or gas medium with a certain mechanical device. However, for this purpose, it is necessary to constantly replenish additional power to operate the mechanical cooling device. Therefore, the power used in the fan or pump will be subtracted from the power generated by the solar module. The net power generation of the solar module decreases.

[0006] In the case of passive cooling, since there is no additional solar panel cooling device, heat is only released passively to the surroundings. Research on conventional passive cooling solar power generation modules has focused on two main methods: PCM (phase change material) or natural convection. Regarding PCM cooling, a PCM material is used to cool the solar power generation panel by absorbing the heat generated during solar power generation during the day. And at night, the heat absorbed by the PCM can be released to the surroundings. However, the use of PCM is mainly at the research stage, and its reproducibility and performance consistency are still issues. Regarding cooling by natural convection, as the name implies, it is a method of cooling the solar panel using natural air. When the installed BIPV module has a ventilation gap 6 between the solar panel and the main body of the building wall, cooling by natural convection can occur on the front and back of the solar panel. As shown in Figure 2, the BIPV module with a standard ventilation gap 6 is installed on the building facade. The solar power generation panel is fixed by steel columns 5 on the facade instead of the heat insulation layer 2. When the air flow 7 advances towards the building at a constant speed, a part of the air flow 7 flows into the ventilation gap 6 and moves upward. Therefore, the higher the air mass flow rate or air velocity, the greater the temperature drop that can occur in the PV module. However, various obstacles (such as steel columns 5) in the ventilation gap 6 reduce the air velocity in the ventilation gap 6, so the actual performance of the convective cooling process with a standard ventilation gap decreases. As shown in Figure 6, heat may accumulate in the central region of the installed solar module matrix. Therefore, in order to improve the convective cooling of the BIPV module, it is necessary to modify the design of such a standard ventilation gap.

[0007] To improve the convective cooling of a ventilated BIPV module, several methods have been adopted to increase the effective heat dissipation area by using an additional thin metal plate structure on the back of the photovoltaic module. As can be seen from FIG. 3, an assembled or conventional metal plate is installed on the back of the solar panel to enhance the convective cooling in the ventilation gap. However, such an additional and rather complex structure significantly increases the BOM cost of individual BIPV panels. Also, the installation of such panels becomes difficult, leading to higher installation costs. Therefore, in addition to the need to modify the standard ventilation gap design to improve the cooling of BIPV, it is also necessary to consider the fixed costs of such modifications economically.

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] The present application aims to provide a novel ventilation structure for a BIPV module that addresses the drawbacks existing in the prior art, strengthens the ventilation cooling of the BIPV module without increasing power consumption, improves its power generation, and ensures low fixed costs for renovation and easy installation. The specific technical solutions are as follows.

MEANS FOR SOLVING THE PROBLEMS

[0009] The present application provides a novel ventilation structure for a BIPV module. The novel ventilation structure for the BIPV module includes a photovoltaic module adapted to the wall body of a building. The back of the photovoltaic module is installed in parallel to the facade of the wall body of the building via a plurality of steel columns. A ventilation gap is formed between the photovoltaic module and the wall body of the building. In the ventilation gap, an intake passage for forming a reduced-diameter intake port is horizontally inserted at the lowermost part, and an exhaust chimney as an exhaust port is vertically inserted at the uppermost part.

[0010] As a preferred technical solution of the present application, the length L of the upper surface of the intake passage is 0.5 to 2 m, the height H of the opening of the intake passage is 0.2 to 0.8 m, the width of the ventilation gap is less than 0.08 m, and the ratio of the height of the opening of the intake passage to the width of the ventilation gap is 2.5 to 10.

[0011] As a preferred technical solution of the present application, the intake passage is designed as a parallel structure.

[0012] As a preferred technical solution of the present application, the bottom surface of the intake passage forms an angle of 20° to 70° with the ground located at the bottom of the wall body of the building.

[0013] As a preferred technical solution of the present application, the end surface at the opening of the intake passage is sealed with an intake grille, and a plurality of through holes arranged in an array are formed in the intake grille. The longitudinal section of the through hole is trumpet-shaped and narrows inward.

[0014] As a preferred technical solution of the present application, the exhaust passage of the exhaust chimney adopts an enlarged-diameter exhaust port design, and the longitudinal section of the exhaust passage is trumpet-shaped and narrows inward.

[0015] As a preferred technical solution of the present application, the exhaust passage of the exhaust chimney adopts a half-enlarged-diameter exhaust port design, and the longitudinal section of the exhaust passage is half-trumpet-shaped and narrows inward.

[0016] As a preferred technical solution of the present application, directly above the uppermost opening of the exhaust passage, a chimney top with a conical structure is erected via a bracket.

[0017] As a preferred technical solution of the present application, the height of the upper surface of the inner straight wall of the exhaust passage is greater than the height of the upper surface of its inner inclined wall.

[0018] As a preferred technical solution of the present application, a plurality of additional intake ports capable of forming reduced-diameter intake ports are formed at equal intervals in the longitudinal direction on the solar power generation module.

[0019] As a preferred technical solution of the present application, the distance between adjacent additional air inlets is 5 to 8 m.

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

[0021] As a preferred technical solution of the present invention, an air guiding sheet inclined upward is provided at the bottom of the inner port of the additional air inlet, and the inclination angle of the air guiding sheet is 20° to 70°.

[0022] As a preferred technical solution of the present application, the solar power generation module is any one of a silicon solar module, a copper indium gallium selenide thin film solar module, a cadmium telluride thin film solar module, an organic solar power generation thin film solar module, a perovskite thin film solar module, a dye-sensitized solar module, and a true heterojunction thin film solar module.

[0023] The beneficial effects of the present invention are as follows.

[0024] The present application simply modifies the air duct between the solar power generation module and the building wall body in a simple manner. By inserting an intake passage for forming a reduced-diameter air inlet and an exhaust chimney as an exhaust port, without the need for a mechanical fan device, the natural convection in the ventilation gap can be accelerated to a high wind speed level similar to that in the case of forced convection, and the ventilation and cooling of the BIPV module can be enhanced without increasing power consumption. Therefore, the high air speed along the ventilation gap can significantly improve the cooling performance of the BIPV module and further improve its power generation. Furthermore, the improved ventilation structure according to the present application can be easily realized without requiring many installation operations. Also, the related fixed costs can be allocated to a large number of modules, so they are much lower than when modifying a single solar panel.

Brief Description of the Drawings

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DETAILED DESCRIPTION OF THE INVENTION

[0026] In order to more clearly illustrate the object, technical solution and advantages of the present invention, the present invention will be described in more detail below in connection with embodiments. It should be understood that the specific embodiments described here are only used for interpreting the present invention and not for limiting the present invention.

[0027] As shown in FIGS. 4 and 5, a novel ventilation structure for a BIPV module includes a photovoltaic module 3 adapted to the wall body 1 of a building. The back surface of the photovoltaic module 3 is installed in parallel to the facade of the wall body 1 of the building via a plurality of steel columns 5. A ventilation gap 6 is formed between the photovoltaic module 3 and the wall body 1 of the building. The ventilation gap 6 has an intake passage 8 for forming a reduced-diameter intake port inserted horizontally at the lowermost part, and an exhaust chimney 11 as an exhaust port inserted vertically at the uppermost part.

[0028] By adopting the above technical solution, the novel ventilation structure can simply modify the air duct between the solar power generation module 3 and the building wall body 1 in a simple manner. By inserting the intake passage 8 for forming a reduced-diameter intake port and the exhaust chimney 11 as an exhaust port, without the need for a mechanical fan device, the natural convection in the ventilation gap 6 can be accelerated to a high wind speed level similar to that in the case of forced convection, and the ventilation and cooling of the BIPV module can be enhanced 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 improve its power generation. Furthermore, the improved ventilation structure can be easily realized without the need for many installation operations. Also, the related fixed costs are much lower than when modifying a single solar panel because the costs can be allocated to a large number of modules.

[0029] By combining the intake passage 8 and the ventilation gap 6 to construct a reduced-diameter intake port, the air volume flow rate can be improved, effectively preventing the air from flowing in all directions when moving towards the building's cladding layer, and most of the airflow 7 naturally entering the intake passage 8 can be deflected towards the ventilation gap 6, so a relatively high air velocity can be realized within the ventilation gap 6.

[0030] The airflow 7 in the exhaust chimney 11 is heated by the thermal effect of the sun, and since the warm air naturally flows upward, a "pulling" effect is generated on the remaining airflow 7 within the ventilation gap 6. In this way, the air velocity behind the top three solar panels of the solar power generation module 3 can be increased. Therefore, the convective cooling performance of this area can be further enhanced.

[0031] As shown in FIG. 4, the upper surface length L of the intake passage 8 is 0.5 to 2 m, the opening 9 height H of the intake passage 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 9 height of the intake passage 8 to the width of the ventilation gap 6 is 2.5 to 10.

[0032] By adopting the above technical solution, in order to construct a reduced-diameter air inlet, the ratio of the height of the opening 9 of the air intake passage 8 to the width of the ventilation gap 6 should always be greater than 2.5. In the present application, this ratio is set to 2.5 - 10. These values may be changed according to the structures of different BIPV modules, and the width of the opening 9 of the air intake passage 8 may be proportionally changed according to the width of the facade of the building wall body 1.

[0033] As shown in FIG. 10, the air intake passage 8 is designed as a parallel structure.

[0034] By adopting the above technical solution, since the air intake passage 8 is provided with a parallel air inlet, the structural design is simple and the manufacturing cost is reduced.

[0035] As shown in FIG. 4, the bottom surface of the air intake passage 8 forms an angle of 20° - 70° with the ground 4 located at the bottom of the building wall body 1.

[0036] By adopting the above technical solution, when natural air enters the opening 9 of the reduced-diameter air intake passage 8, the volume flow rate of the air increases several times according to the limited shape. By adopting the reduced-diameter air inlet design, it can effectively prevent the air from flowing in all directions when moving towards the building's cladding layer, so that a larger part of the air flow 7 is deflected towards the ventilation gap 6. Therefore, a large air flow passing through a small inlet can make the air velocity in the ventilation gap 6 much higher and further improve the cooling performance of the BIPV module.

[0037] As shown in FIG. 10, the end face at the opening 9 of the air intake passage 8 is sealed by an air intake grille 10, and a plurality of through holes arranged in an array are formed in the air intake grille 10. The longitudinal section of the through hole is trumpet-shaped and narrows towards the inside.

[0038] By adopting the above technical solution, the intake grille 10 having the arranged trumpet-shaped through holes can further control the direction and speed of the air flow by forming a secondary reduced-diameter intake port, so that the cooling performance of the BIPV module can be improved better.

[0039] As shown in FIG. 11, the exhaust passage 12 of the exhaust chimney 11 adopts an enlarged-diameter exhaust port design, the longitudinal section of the exhaust passage 12 is trumpet-shaped, and it becomes narrower towards the inside.

[0040] By adopting the above technical solution and making the exhaust passage 12 have an enlarged-diameter exhaust port design, the "pulling" effect can be further enhanced and the speed of the air flow 7 can be increased, so that the cooling performance of the uppermost area of the photovoltaic module 3 can be improved.

[0041] As shown in FIG. 11, the exhaust passage 12 of the exhaust chimney 11 adopts a half-enlarged-diameter exhaust port design, the longitudinal section of the exhaust passage 12 is half-trumpet-shaped, and it becomes narrower towards the inside.

[0042] By adopting the above technical solution and making the exhaust passage 12 have different half-enlarged-diameter exhaust port designs and the above enlarged-diameter exhaust port design by the air flow 7, or an exhaust port design with a gradually enlarged diameter, the "pulling" effect can be further enhanced and the speed of the air flow 7 can be increased, so that the cooling performance of the uppermost area of the photovoltaic module 3 can be improved.

[0043] As shown in FIGS. 5 and 11, directly above the uppermost opening of the exhaust passage 12, a chimney top 14 with a conical structure is erected via a bracket 13.

[0044] By adopting the above technical solution, the chimney top 14 is provided to avoid fallen leaves from blocking the ventilation gap 6, and with a conical structure, fallen leaves, rain, snow, etc. can slide off quickly.

[0045] As shown in FIG. 11, the upper surface height of the inner straight wall of the exhaust passage 12 is greater than the upper surface height of its inner inclined wall.

[0046] By adopting the above technical solution, the airflow 7 in the exhaust passage 12 can be guided on one side, the speed of the airflow 7 can be further improved, and it can function to support instead of the bracket 13 on one side.

[0047] As shown in FIG. 9, a plurality of additional air inlets 15 capable of forming reduced-diameter air inlets are formed at equal intervals in the longitudinal direction on the solar power generation module 3.

[0048] By adopting the above technical solution, as can be seen from FIGS. 7 and 8, as the height of the building increases, the influence of convective cooling decreases. Therefore, the ventilation temperature of the reduced-diameter air inlet of the air intake passage 8 rises and the related wind speed decreases. In order to solve such problems, additional air inlets 15 capable of forming reduced-diameter air inlets may be repeatedly installed between different floors. These additional air inlets 15 can increase the air speed in the ventilation gap 6 by introducing more airflows and strengthen the cooling of the solar power generation module 3 installed on the upper floors of the building. It should be noted that all the designs based on these new ideas are not cost-intensive and do not require additional power consumption.

[0049] As shown in FIG. 9, the interval between adjacent additional air inlets 15 is 5 to 8 m.

[0050] By adopting the above technical solution, for the floors of high-rise buildings, such installations may be repeatedly carried out, for example, by providing one additional air inlet 15 every 5 to 8 m.

[0051] As shown in FIG. 9, the length of the additional air inlet 15 is less than 0.1 m, the height of the port 16 of the additional air inlet 15 is 0.2 to 0.4 m, 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.

[0052] By adopting the above technical solution, the above data is a typical size of the additional air inlet 15, and a small-diameter reduced air inlet can be formed to further increase the speed of the cooling air.

[0053] As shown in FIG. 9, at the bottom of the inner port 16 of the additional air inlet 15, an air guiding sheet 17 inclined upward is provided, and the inclination angle of the air guiding sheet 17 is 20° to 70°.

[0054] By adopting the above technical solution, in order to forcibly move the additional air flow upward, the air guiding sheet 17 with an inclination angle of 20° to 70° is used. Since the communication part between the additional air inlet 15 and the ventilation gap 6 is semi-open, the air on the lower floor can still flow upward.

[0055] As shown in FIG. 5, the above photovoltaic module 3 is any one of a silicon solar module, a copper indium gallium selenide thin film solar module, a cadmium telluride thin film solar module, an organic photovoltaic thin film solar module, a perovskite thin film solar module, a dye-sensitized solar module, and a true heterojunction thin film solar module.

[0056] By adopting the above technical solution, it should be noted that all commercially available types of BIPV modules, 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 modules, perovskite thin film solar modules, dye-sensitized solar (DSSC) modules, and true heterojunction thin film (HJT) solar modules, can adopt such a novel and improved ventilation method. Related tests:

[0057] Figure 6 shows the simulation mapping results of the temperature field of a BIPV panel using a reduced-diameter air inlet. Therefore, the boundary conditions of the simulation were set as follows. Ambient temperature 20 °C (RT), the BIPV module is a standard black CIGS panel, and one simulation matrix unit consists of three commercially available standard CIGS BIPV modules (length ~1.6 m, width ~0.65 m), peripheral wind speed 4 m / s (light wind of Beaufort wind force class 2), and the surrounding wind is guided into the ventilation structure. The solar irradiance is 1000 W / m 2 (In most regions of the earth, the solar irradiance at noon on a sunny day is 700 - 1300 W / m 2 ). Such boundary conditions should be representative of most BIPV applications. As shown in Figure 6, compared with the case where all nine solar panels have no ventilation gap (Figure 1) and the case with a standard ventilation gap (see Figure 2), the temperature field of the 3x3 PV module matrix using the reduced-diameter air inlet (Figure 4) decreased significantly. Only the top three panels are slightly warmer than the remaining six panels. This shows that with the help of the reduced-diameter air inlet and high-speed air, the weakening effect of convective cooling can be eliminated. However, such an influence has not been completely eliminated. In order to further improve the cooling performance of the installed BIPV modules, especially the top three panels, an exhaust chimney 11 (shown in Figure 5) was added to the exhaust port of the ventilation gap 6.

[0058] Figure 7 shows that in all four types of BIPV module installation configurations, namely, without ventilation gap (Figure 1), standard ventilation gap (Figure 2), ventilation with a reduced-diameter air inlet (Figure 4), and ventilation with a reduced-diameter air inlet and exhaust chimney structure (Figure 5), the temperature along the central axis of the installed solar panels changes with the increase in the height of the building, showing their temperature distributions more clearly and quantitatively. Note that the temperature drops at heights of about 2.1 m and about 3.7 m are due to the installation gap between the short front edges of the solar panels. Compared with the standard ventilation gap design, the improved ventilation concept using a reduced-diameter air inlet and an exhaust chimney can effectively lower the temperature of the solar panels by 20 - 50 K. That is, for CIGS solar modules (Tk When the temperature coefficient is -0.35% / K, it can be seen that the power generation can be appropriately increased by 8 - 20%. It is clearly shown that the solar panel using both the reduced-diameter air inlet and the exhaust chimney structure further enhances the cooling of the top three solar panels (by 2 - 10K) compared to the solar panel using only the reduced-diameter air inlet.

[0059] Figure 8 shows the installation configurations of three types of BIPV modules along the central axis, namely, the standard ventilation gap (Figure 2), the ventilation with a reduced-diameter air inlet (Figure 4), the ventilation with a reduced-diameter air inlet and an exhaust chimney structure (Figure 5), and the wind speed distribution of the installed solar panels according to the increase in building height. Compared with the standard ventilation gap design, the improved ventilation concept adopting the reduced-diameter air inlet and the exhaust chimney can significantly increase the air speed behind the solar panel by 5 - 47 m / s. Therefore, the convective cooling performance is effectively improved. Also, compared with the solar panel using only the reduced-diameter air inlet for the top three panels, the wind speed of the solar panel with the reduced-diameter air inlet and the exhaust chimney structure increases by 1 m / s - 3 m / s.

[0060] As shown in Figures 7 and 8, as the building height increases, the influence of convective cooling decreases. Therefore, as the temperature of the BIPV module installation structure with a reduced-diameter air inlet for ventilation rises, the related air speed decreases. To solve such problems, the configuration of the reduced-diameter air inlet, that is, the additional air inlet 15 (shown in Figure 9), may be provided in the repeated form of the present application.

[0061] What has been described above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, substitutions by equivalents, improvements, etc. made within the scope of the gist and principles of the present application should all be included within the protection scope of the present invention.

Explanation of Reference Numerals

[0062] 1 Building wall body 2 Heat insulation layer 3 Solar power generation module 4 Ground 5 Steel column 6 Ventilation gap 7 Airflow 8 Intake passage 9 Opening 10 Intake grille 11 Exhaust chimney 12 Exhaust passage 13 Bracket 14 Chimney top 15 Additional intake port 16 Port 17 Air guide sheet

Claims

1. A novel ventilation structure for a BIPV module, comprising a solar power generation module (3) adapted to the wall body (1) of a building, the back surface of the solar power generation module (3) being installed in parallel with the facade of the wall body (1) of the building via a plurality of steel columns (5), and a ventilation gap (6) being formed between the solar power generation module (3) and the wall body (1) of the building, wherein an intake passage (8) for forming a reduced-diameter intake port is horizontally inserted at the lowermost part of the ventilation gap (6), and an exhaust chimney (11) as an exhaust port is vertically inserted at the uppermost part. A novel ventilation structure for a BIPV module, characterized in that.

2. The upper surface length L of the intake passage (8) is 0.5 to 2 m, the height H of the opening (9) of the intake passage (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 height of the opening (9) of the intake passage (8) to the width of the ventilation gap (6) is 2.5 to 10. A novel ventilation structure for a BIPV module according to claim 1, characterized in that.

3. The intake passage (8) is designed as a parallel structure. A novel ventilation structure for a BIPV module according to claim 1, characterized in that.

4. The bottom surface of the intake passage (8) forms an angle of 20° to 70° with the ground (4) located at the bottom of the wall body (1) of the building. A novel ventilation structure for a BIPV module according to claim 1, characterized in that.

5. The end surface of the opening (9) of the intake passage (8) is sealed with an intake grill (10), and a plurality of through holes arranged in an array are formed in the intake grill (10), and the longitudinal section of the through hole is trumpet-shaped and narrows inward. A novel ventilation structure for a BIPV module according to claim 4, characterized in that.

6. The exhaust passage (12) of the exhaust chimney (11) adopts an enlarged-diameter exhaust port design, and the longitudinal section of the exhaust passage (12) is trumpet-shaped and narrows inward. A novel ventilation structure for a BIPV module according to claim 1, characterized in that.

7. The exhaust passage (12) of the exhaust chimney (11) adopts a half-enlarged-diameter exhaust port design, and the longitudinal section of the exhaust passage (12) is half-trumpet-shaped and narrows inward. A novel ventilation structure for a BIPV module according to claim 1, characterized in that.

8. Immediately above the uppermost opening of the exhaust passage (12), a chimney top (14) having a conical structure is installed via a bracket (13). A novel ventilation structure for a BIPV module according to claim 6 or 7, characterized in that.

9. The height of the upper surface of the inner straight wall of the exhaust passage (12) is greater than the height of the upper surface of its inner inclined wall. A novel ventilation structure for a BIPV module according to claim 7, characterized in that.

10. A plurality of additional air inlets (15) capable of forming reduced-diameter air inlets are formed at equal intervals in the longitudinal direction on the solar power generation module (3). A novel ventilation structure for a BIPV module according to claim 4, characterized in that.

11. The interval between adjacent additional air inlets (15) is 5 to 8 m. A novel ventilation structure for a BIPV module according to claim 10, characterized in that.

12. The length of the additional air inlet (15) is less than 0.1 m, the height of the port (16) of the additional air inlet (15) is 0.2 to 0.4 m, 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. A novel ventilation structure for a BIPV module according to claim 10, characterized in that.

13. An air guiding sheet (17) inclined upward is provided at the bottom of the inner port 16 of the additional air inlet (15), and the inclination angle of the air guiding sheet (17) is 20° to 70°. A novel ventilation structure for a BIPV module according to claim 10, characterized in that.

14. The solar power generation module (3) is any one of a silicon solar module, a copper indium gallium selenide thin film solar module, a cadmium telluride thin film solar module, an organic solar thin film solar module, a perovskite thin film solar module, a dye-sensitized solar module, and a true heterojunction thin film solar module. A novel ventilation structure for a BIPV module according to claim 1, characterized in that.

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