Photovoltaic curtain wall ventilation system of composite diversion and bionic fin heat exchange structure

Abstract

The invention relates to the technical field of photovoltaic curtain wall ventilation, and particularly discloses a photovoltaic curtain wall ventilation system of a composite diversion and bionic fin heat exchange structure. Aiming at the technical defect of low heat dissipation efficiency of a photovoltaic curtain wall in the prior art, the invention innovatively provides a composite ventilation structure of a hot-pressing driving layer, an airflow strengthening layer and an accelerated convection layer. A solar heat collection type air inlet grille with a through hole structure is arranged at the bottom or the side face of the bottom of the curtain wall, the air inlet temperature is actively increased, and the initial hot-pressing gradient is formed; a middle air inlet grille is arranged in the middle of the curtain wall, an arc-shaped rain baffle is arranged in an inner cavity of the curtain wall, low-temperature air supplementation is carried out on an airflow space, a Venturi effect can be formed in the inner cavity of the curtain wall, the effect of strengthening and accelerating airflow is achieved, and a wall rainproof effect can also be formed. A solar heat collection space is arranged at the top of the curtain wall, the air temperature is actively increased, a stable hot-pressing driving source is established, air in an inner cavity of the curtain wall is driven to flow out in an accelerated mode, and the efficiency attenuation problem caused by heat accumulation of the photovoltaic curtain wall is effectively solved.

Description

Technical Field

[0001] This application relates to the technical field of green building curtain wall structures, and particularly to a heat exchange photovoltaic curtain wall ventilation system with a composite flow guiding and bionic fin structure. Background Art

[0002] The photovoltaic curtain wall system is an integrated solution for building envelopes and photovoltaic power generation. In the application scenario in hot summer, the accumulated waste heat generated by photovoltaic power generation causes the temperature of the photovoltaic panels to rise, resulting in a decline in power generation efficiency. Most existing photovoltaic curtain wall ventilation systems adopt a single-channel passive ventilation structure. For example, a photovoltaic curtain wall system for a building facade disclosed in Chinese invention patent CN114086700A only realizes heat convection through a single cavity between the photovoltaic panels and the wall, but has the following defects: ① The air flow path is single, lacking an active heat collection and stratified acceleration mechanism, resulting in serious heat accumulation in high-temperature areas (such as the top of the photovoltaic panels). After testing, the temperature difference in the traditional single-channel system can only be maintained at 5-8°C, and the thermal pressure driving force is insufficient; ② Heat cannot be effectively recovered in winter, and the heat loss of the wall reaches more than 30%; ③ It is not linked with the building body thermal management system, and the heat is not reasonably utilized.

[0003] In addition, when the photovoltaic curtain wall system in the prior art is designed as a whole, the impact on the building body is often ignored. For example, when the photovoltaic curtain wall system has a ventilation structure but the end point of its heat dissipation is the building wall, this violates the concept of green buildings. Therefore, the energy-saving design of green building curtain walls should not only consider the coordination of the external structure, but also consider its adaptability to the application scenario. Summary of the Invention

[0004] This application provides a photovoltaic curtain wall ventilation system with a composite flow guiding and bionic fin heat exchange structure, which has a heat storage ventilation switching mechanism, can form a reasonable air flow path, and is adapted to the building body.

[0005] The technical solution of this application is as follows: In a first aspect, this application provides a photovoltaic curtain wall ventilation system with bottom air intake, specifically a photovoltaic curtain wall ventilation system with a composite flow guiding and bionic fin heat exchange structure, including a wall and upper and lower photovoltaic panels spaced outside the wall. An air flow space is formed between the wall and the upper and lower photovoltaic panels, and the wall extends longitudinally from a lower structural beam and horizontally into the interior of the building body at the top of the upper photovoltaic panel to form a heat collection space communicating with the interior of the building body between the top of the wall and the upper structural beam. The air flow space communicates with the heat collection space, and it is characterized in that The lower end of the lower photovoltaic panel is connected to a lower air intake plate with a bottom edge higher than the lower edge of the wall, so as to form a lower air intake opening communicating with the air flow space below the lower air intake plate; The lower - layer photovoltaic panel and the upper - layer photovoltaic panel are arranged at intervals, and a middle air - intake grille communicating with the air - flow space is provided at the interval; the middle air - intake grille can adopt NACA - airfoil guide vanes, with a leading - edge radius of 0.5 - 30 mm and a trailing - edge angle of 5 - 15°. After wind - tunnel testing, the incoming air flow velocity can be increased by 15 - 30%, and the pressure loss can be reduced by 10 - 18%.

[0006] A light - transmitting vertical plate and a light - transmitting cover plate for transmitting light to the heat - collecting space are respectively provided at the top of the upper - layer photovoltaic panel and the top of the heat - collecting space; In the heat - collecting space, an air - intake plate and an air - outlet are respectively provided at the top of the longitudinal wall and the rear - middle part of the horizontal wall. The height of the air - intake plate is lower than that of the air - outlet, and a heat - absorbing plate core is erected between the top end of the air - intake plate and the top end of the air - outlet.

[0007] Furthermore, the air - intake plate includes a grille frame and air - intake grilles stacked in the grille frame. A number of ventilation holes are arranged in a matrix on the surface of the air - intake grilles, and the air - intake grilles gradually rise from the air - intake front end to the air - intake rear end; The air - outlet includes a grille frame and air - outlet grilles stacked in the grille frame. A number of ventilation holes are arranged in a matrix on the surface of the air - outlet grilles, and the air - outlet grilles gradually rise from the air - outlet front end to the air - outlet rear end; The heat - absorbing plate core is provided with staggered first trapezoidal fins, second trapezoidal fins and transition fins connecting the first trapezoidal fins and the second trapezoidal fins. This structure has the characteristics of progressive bionic structure design; the height of the first trapezoidal fins is lower than that of the second trapezoidal fins, and a number of ventilation holes are arranged in a matrix on the surfaces of the first trapezoidal fins and the transition fins. This structure can increase the heat - absorbing area, contribute to forming a reasonable heat - flux density, and improve the heat - exchange efficiency.

[0008] Second aspect, the present application provides a photovoltaic curtain wall ventilation system with side air intake, a photovoltaic curtain wall ventilation system with a composite flow guiding and bionic fin heat exchange structure, including a wall body and an upper photovoltaic panel and a lower photovoltaic panel spaced outside the wall body. An air flow space is formed between the wall body and the upper and lower photovoltaic panels, and the wall body extends longitudinally from a lower structural beam and horizontally extends into the building main body at the top of the upper photovoltaic panel to form a heat collection space communicating with the inside of the building main body between the top of the wall body and an upper structural beam. The air flow space communicates with the heat collection space. An absorber plate core is provided at the bottom of the lower photovoltaic panel to the level of the lower edge of the wall body. The absorber plate core includes a number of heat absorption units extending transversely along the heat collection space. The heat absorption unit includes a first trapezoidal fin, a second trapezoidal fin, and a transition fin connecting the first trapezoidal fin and the second trapezoidal fin; the height of the first trapezoidal fin is lower than that of the second trapezoidal fin, and ventilation holes are arranged in a matrix on the surfaces of the first trapezoidal fin and the transition fin, and the ventilation holes communicate the outside air with the air flow space in a direction perpendicular to the longitudinal wall body; the lower photovoltaic panel and the upper photovoltaic panel are spaced apart and a middle air intake grille communicating with the air flow space is provided at the interval; light-transmitting vertical plates and light-transmitting covers for transmitting light to the heat collection space are respectively provided at the top of the upper photovoltaic panel and the top of the heat collection space; an air intake plate and an air outlet are respectively provided at the top of the longitudinal wall body and the middle and rear part of the horizontal wall body of the heat collection space, the height of the air intake plate is lower than that of the air outlet, and an absorber plate core is erected between the top end of the air intake plate and the top end of the air outlet.

[0009] Further, the air intake plate includes a grille frame and air intake grilles stacked in the grille frame. A number of ventilation holes are arranged in a matrix on the surface of the air intake grille, and the air intake grille gradually rises from the air intake front end to the air intake rear end; the air outlet includes a grille frame and air outlet grilles stacked in the grille frame. A number of ventilation holes are arranged in a matrix on the surface of the air outlet grille, and the air outlet grille gradually rises from the air outlet front end to the air outlet rear end.

[0010] In a third aspect, the present application provides a photovoltaic curtain wall ventilation system with side air intake, and a fin group is adopted in the top heat collection space. Specifically, a photovoltaic curtain wall ventilation system with a composite flow guiding and bionic fin heat exchange structure includes a wall body, and upper and lower photovoltaic panels arranged at intervals outside the wall body. An air flow space is formed between the wall body and the upper and lower photovoltaic panels, and the wall body extends longitudinally from a lower structural beam and horizontally extends into the interior of the building body at the top of the upper photovoltaic panel to form a heat collection space communicating with the interior of the building body between the top of the wall body and an upper structural beam. The air flow space communicates with the heat collection space. An absorber core is provided at the bottom of the lower photovoltaic panel to the level of the lower edge of the wall body. The absorber core includes a number of absorber units extending horizontally along the heat collection space. The absorber unit includes a first trapezoidal fin, a second trapezoidal fin, and a transition fin connecting the first trapezoidal fin and the second trapezoidal fin. The height of the first trapezoidal fin is lower than that of the second trapezoidal fin, and ventilation holes are arranged in a matrix on the surfaces of the first trapezoidal fin and the transition fin. The ventilation holes communicate the outside air with the air flow space in a direction perpendicular to the longitudinal wall body. The lower photovoltaic panel and the upper photovoltaic panel are arranged at intervals, and a middle air intake grille communicating with the air flow space is provided at the interval. Transparent vertical plates and transparent cover plates for transmitting light to the heat collection space are respectively provided at the top of the upper photovoltaic panel and the top of the heat collection space. A fin group and an air outlet are sequentially arranged in the heat collection space from the front side in the horizontal wall air intake direction to the rear side in the air intake direction. The fin group includes a number of rectangular fins, and the fins are perpendicular to both the horizontal wall body and the transparent vertical plate.

[0011] Further, the air outlet includes a grille frame and air outlet grilles stacked in the grille frame. A number of ventilation holes are arranged in a matrix on the surface of the air outlet grilles, and the air outlet grilles gradually rise from the air outlet front end to the air outlet rear end.

[0012] Fourthly, the present application provides a photovoltaic curtain wall system with bottom air intake and a fin group in the heat collection space, specifically a photovoltaic curtain wall ventilation system with a composite flow guiding and bionic fin heat exchange structure, including a wall body, an upper photovoltaic panel and a lower photovoltaic panel which are arranged at intervals on the outer side of the wall body. An air flow space is formed between the wall body and the upper and lower photovoltaic panels, and the wall body extends longitudinally from a lower structural beam and horizontally extends into the building body at the top of the upper photovoltaic panel to form a heat collection space communicating with the inside of the building body between the top of the wall body and an upper structural beam. The air flow space communicates with the heat collection space. The lower end of the lower photovoltaic panel is connected to a lower air intake plate with a bottom edge higher than the lower edge of the wall body so as to form a lower air intake opening communicating with the air flow space below the lower air intake plate; the lower photovoltaic panel and the upper photovoltaic panel are arranged at intervals, and a middle air intake grille communicating with the air flow space is arranged at the interval; in the heat collection space, a fin group and an air outlet are sequentially arranged from the front side to the rear side along the horizontal wall air intake direction. The fin group includes a plurality of rectangular fins, and the fins are perpendicular to both the horizontal wall and the light-transmitting vertical plate.

[0013] Further, the air outlet includes a grille frame and air outlet grilles stacked in the grille frame. A plurality of ventilation holes are arranged in a matrix on the surface of the air outlet grilles, and the air outlet grilles gradually rise from the air outlet front end to the air outlet rear end.

[0014] Lower than the bottom ventilation structure, further, at the bottom of the air flow space and at a position flush with the lower edge of the lower air intake plate, a heat absorption unit is horizontally arranged. The ventilation holes of the heat absorption unit communicate the outside air with the air flow space in the vertical direction.

[0015] For the above four aspects, as an improvement, a drain opening is arranged at the lower end of the middle air intake grille, a rain shield connected to the drain opening is arranged in the air flow space, and an arc transition is formed between the lower end of the rain shield and the drain opening; the top end of the rain shield is higher than the top end of the middle air intake grille; An insect-proof net is arranged in the heat collection space between the air outlet and the rear end of the horizontal wall body, and an upper air outlet grille is arranged at the connection between the heat collection space and the building body.

[0016] The rain shield is arc-shaped, with the top end higher than the top end of the middle air intake grille. The distance from the back of the photovoltaic panel accounts for 1 / 4 to 1 / 2 of the total ventilation distance. The arc transition section of the rain shield uses the Venturi effect to accelerate the air flow, and the throat cross-sectional area is reduced by 25 - 50%.

[0017] An insect-proof net is arranged in the heat collection space between the air outlet and the rear end of the horizontal wall body, and an upper air outlet grille is arranged at the connection between the heat collection space and the building body.

[0018] This application provides a variety of photovoltaic curtain wall ventilation system construction forms under a technical concept, which has the following technical effects: This application innovatively constructs an airflow flow form of "thermal pressure driving layer-airflow strengthening layer-accelerating convection layer". In this application, a heat collection space is set at the top of the ventilation system structure to actively collect heat, so that it forms a significant temperature difference with the airflow space below, and then a heat pressure belt is formed in the airflow space and the heat collection space, which prompts the air in the low-temperature zone to actively flow to the high-temperature zone, forming a basic cycle. A middle air intake grille is set in the middle of the photovoltaic panel. The pressure difference is formed inside and outside the middle air intake grille due to the different air flow rates. The external air enters the airflow space through the grille, and the air in the airflow space is accelerated. The air in the heat collection space eventually flows to the interior of the building body to be used or discharged. In the above cycle, the air on the back of the photovoltaic panel is always in a flowing state during the operation of the photovoltaic panel, and the heat is difficult to store, so the temperature on the back of the photovoltaic panel naturally decreases. In addition, the flowing air on the back of the photovoltaic panel takes away part of the heat through heat exchange when passing through, thereby reducing the temperature of the photovoltaic panel.

[0019] There are two ways to optimize the above airflow circulation, one is to enhance the heat collection effect in the heat collection space, and the other is to increase the bottom air intake velocity. In the second idea, the bottom air intake is expanded into bottom plate air intake and side plate air intake according to the air flow direction.

[0020] 1. In the present application, a ventilation system is provided on the photovoltaic back panel, and the heat flux gradient formed helps to promote natural air convection. When the temperature in the heat collection space is higher than that in the air flow space, the existence of the heat flux gradient enables the air in the low temperature zone to actively flow to the high temperature zone, forming a basic air circulation. This natural convection process can effectively take away the heat generated by the photovoltaic panels, reduce the temperature of the photovoltaic panels, and improve the power generation efficiency. Reasonable heat flux density distribution can ensure the efficient operation of the system. By adopting a tapered fin design, such as the first trapezoidal fin and the second trapezoidal fin in the heat absorption plate core, the heat can be distributed more evenly in space. This can avoid local overheating or overcooling and improve the heat exchange efficiency of the entire system. At the same time, a reasonable heat flux density distribution can also help to extend the service life of the system and reduce material aging and damage caused by excessive local temperature.

[0021] 2. The design of the reduced fin causes the surface area of the fin to gradually change, thereby affecting the heat transfer and distribution. During the heat absorption process, more heat is received at the front end of the fin, and as the heat is transferred to the rear end of the fin, the heat gradually decreases. The shape of the reduced fin can make the heat distribution on the fin more uniform, avoiding local high temperatures caused by excessive heat concentration at the front end. In addition, the structure of the reduced fin can also increase the contact area between the air and the fin surface, improving the heat exchange efficiency. When the air flows through the fin, due to the irregular shape of the fin surface, the air will generate turbulence, enhancing the heat transfer effect. This turbulence effect enables the air to exchange heat with the fin more fully, further improving the overall performance of the system.

[0022] 3. The design of the ventilation fins is mainly to increase the heat exchange area of the heat collection space and improve the heat collection efficiency. The rectangular fins in the fin group are perpendicular to both the horizontal wall and the light-transmitting vertical plate at the same time. Such an arrangement can make the sunlight shine on the fins more fully, increasing the heat absorption. When the air flows through the fins, the surface of the fins will exchange heat with the air and transfer the heat to the air. Due to the increase in fins, the heat exchange area increases, thereby improving the heating effect of the heat collection space on the air. In addition, the design of the fins can also play a role in guiding the flow, making the air flow more evenly in the heat collection space, further improving the heat exchange efficiency. By reasonably designing the shape, size and spacing of the fins, the air flow path and heat exchange effect can be optimized, thereby improving the performance of the entire photovoltaic curtain wall ventilation system.

[0023] 4. For the lower air inlet, in this application, after laying the heat absorption unit flat, the ventilation holes are directed downward to form gradient diversion holes at the bottom of the air flow space. The Bernoulli effect is used to accelerate the air flow at the air inlet, increasing the temperature difference between the air flow space and the heat collection space and enhancing the air flow circulation efficiency.

[0024] 5. For the side plate air inlet, in this application, the fins with a bent and reduced structure are used to achieve gradient acceleration of the side air flow. When the air flow passes through the heat absorption plate core at the bottom, the second trapezoidal fin diverts the front air flow to both sides, accelerating the air flow into the ventilation holes on both sides; when the air flow flows laterally to the second trapezoidal fin, the air flow is accelerated by the side of the reduced fin, forming an air pressure difference on the surface of the heat absorption plate core, and the air flow enters the ventilation holes.

[0025] 6. As a preferred embodiment of this application, a rain shield is provided behind the middle air inlet grille. In addition to the rain shielding function, the rain shield also has the function of accelerating the air flow. Specifically, the lower end of the rain shield has an arc transition with the drain outlet, and in the air flow space, the arc transition section reduces the air flow through area, using the Venturi effect to accelerate the air flow and enhancing the air flow circulation effect. Description of the Drawings

[0026] The accompanying drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application.

[0027] Figure 1 It is a schematic structural diagram of a photovoltaic curtain wall ventilation system with bottom air inlet form in the present application; Figure 2 is Figure 1 a side view schematic diagram of the photovoltaic curtain wall ventilation system in Figure 3 is Figure 1 a formal schematic diagram of the photovoltaic curtain wall ventilation system in Figure 4 It is a schematic structural diagram of a photovoltaic curtain wall ventilation system with side air inlet form in the present application; Figure 5 It is a schematic structural diagram of a photovoltaic curtain wall ventilation system with a rib plate group form in the heat collection space in the present application; Figure 6 It is a schematic structural diagram of the heat absorption plate core and heat absorption unit in the present application; Figure 7 It is a schematic structural diagram of the lower air inlet plate in the present application; Figure 8 It is a schematic structural diagram of the connecting piece in the present application; Figure 9 It is a schematic structural diagram of the fin group in the present application; Figure 10 It is a schematic structural diagram of the rain shield in the present application; Figure 11 It is a schematic structural diagram of the upper air outlet grille in the present application.

[0028] In the accompanying drawings: 1. Wall; 1-1. Waterproof layer; 1-2. Thermal insulation layer; 2. Upper layer photovoltaic panel; 3. Lower layer photovoltaic panel; 4. Air flow space; 5. Heat collection space; 6. Lower air inlet plate; 7. Lower air inlet; 8. Middle air inlet grille; 8-1. Drainage port; 9. Transparent vertical plate; 10. Transparent cover plate; 11. Air inlet plate; 11-1. Grille frame; 11-2. Air inlet grille; 12. Air outlet; 12-1. Air outlet grille; 13. Heat absorption plate core; 13-1. Fixed shaft; 13-2. Side hanging plate; 14. Ventilation hole; 15. Heat absorption unit; 15-1. First trapezoidal fin; 15-2. Second trapezoidal fin; 15-3. Transition fin; 16. Fin group; 16-1. Fin; 16-2. Fin fixing rod; 17. Top side plate; 18. Rain shield; 19. Insect screen; 20. Upper air outlet grille; 21. Invisible support plate; 22. Invisible decorative plate; 23. Electric louver; 24. Air outlet; 25. Connector; 26. Vertical lintel; 27. Slide rail. Detailed implementation mode

[0029] Based on the background technology, considering the change of the application scenario of the photovoltaic curtain wall and the unreasonable air circulation path in the prior art, the present application provides a technical concept of a photovoltaic curtain wall ventilation system capable of providing stable power. Under this technical concept, two air inlet structures of bottom air inlet and side air inlet are designed, and two heat absorption structures of a heat absorption plate core 13 and a fin group 16 are designed at the top.

[0030] In a first aspect, the present application provides a combined structure of bottom air intake and a heat absorption plate core 13 in a heat collection space 5. Specifically, it is a photovoltaic curtain wall ventilation system with a composite diversion and bionic fin heat exchange structure, including a wall body 1, an upper photovoltaic panel 2 and a lower photovoltaic panel 3 arranged at intervals outside the wall body 1. An air flow space 4 is formed between the wall body 1, the upper photovoltaic panel 2 and the lower photovoltaic panel 3. The wall body 1 extends longitudinally from a lower structural beam and horizontally extends into the interior of the building body at the top of the upper photovoltaic panel 2 to form a heat collection space 5 communicating with the interior of the building body between the top of the wall body 1 and the upper structural beam. The air flow space 4 communicates with the heat collection space 5. The lower end of the lower photovoltaic panel 3 is connected to a lower air intake plate 6 with a bottom edge higher than the lower edge of the wall body 1 so as to form a lower air intake port 7 communicating with the air flow space 4 below the lower air intake plate 6; the lower photovoltaic panel 3 and the upper photovoltaic panel 2 are arranged at intervals and a middle air intake grille 8 communicating with the air flow space 4 is provided at the interval; light-transmitting vertical plates 9 and light-transmitting cover plates 10 for transmitting light to the heat collection space 5 are respectively provided at the top of the upper photovoltaic panel 2 and the top of the heat collection space 5; an air intake plate 11 and an air outlet 12 are respectively provided at the top of the longitudinal wall body 1 and the middle and rear part of the horizontal wall body 1 in the heat collection space 5. The height of the air intake plate 11 is lower than that of the air outlet 12, and a heat absorption plate core 13 is erected between the top end of the air intake plate 11 and the top end of the air outlet 12. The air intake plate 11 includes a grille frame 11-1 and air intake grilles 11-2 stacked in the grille frame 11-1. A plurality of ventilation holes 14 are arranged in a matrix on the surface of the air intake grilles 11-2, and the air intake grilles 11-2 gradually rise from the air intake front end to the air intake rear end; the air outlet 12 includes a grille frame 11-1 and air outlet grilles 12-1 stacked in the grille frame 11-1. A plurality of ventilation holes 14 are arranged in a matrix on the surface of the air outlet grilles 12-1, and the air outlet grilles 12-1 gradually rise from the air outlet front end to the air outlet rear end; the heat absorption plate core 13 includes a plurality of heat absorption units 15 extending horizontally in the heat collection space 5. The heat absorption unit 15 includes a first trapezoidal fin 15-1, a second trapezoidal fin 15-2 and a transition fin 15-3 connecting the first trapezoidal fin 15-1 and the second trapezoidal fin 15-2; the height of the first trapezoidal fin 15-1 is lower than that of the second trapezoidal fin 15-2, and a plurality of ventilation holes 14 are arranged in a matrix on the surfaces of the first trapezoidal fin 15-1 and the transition fin 15-3.

[0031] See the appendix Figure 1 and the appendix Figure 2, the wall 1 in this application may include the accessory structures of the wall 1, such as the thermal insulation layer 1-2 and the waterproof layer 1-1. When the wall 1 includes accessory structures, its accessory structures are regarded as part of the wall 1 to delimit the heat collection space 5. Through numerical simulation tests, the heat absorption unit 15 with a stepped fin structure can increase the heat collection efficiency by 28-35%, and the overall power generation efficiency of the system is increased by 15-20% compared with the traditional structure.

[0032] Refer to the appendix Figure 1 to the appendix Figure 5 , in this application, multiple groups of photovoltaic panels can be spliced and combined. The appendix Figure 1 to the appendix Figure 5 shows the combined structure of two systems. Each system includes an upper photovoltaic panel and a lower photovoltaic panel. The upper and lower sides of the photovoltaic panel are connected by the invisible decorative panel 22 and the invisible support panel 21. For the specific connection structure, refer to the appendix Figure 2 and the appendix Figure 8 .

[0033] Refer to the appendix Figure 2 , there is a gap between the photovoltaic panel and the wall 1 and its accessory structures in this application. The photovoltaic panel is fixed to the wall 1 through the connecting piece 25, and an air flow space 4 is formed between the wall 1 and the photovoltaic panel.

[0034] For example, the power generation of a silicon-based photovoltaic panel at 85°C and 50°C can differ by about 15%. Therefore, reducing the temperature of the photovoltaic panel can improve the power generation efficiency and increase the power generation. In the summer working condition, the temperature of the photovoltaic panel is relatively high, up to about 90°C. Therefore, it is necessary to structurally cool the photovoltaic panel. Through the ventilation structure of this application, through numerical simulation, in the typical summer working condition (ambient temperature 30°C, solar irradiance 1000 W / m²), this system can reduce the surface temperature of the photovoltaic panel from 85°C of the traditional system to 40-65°C, and the daily power generation is increased by 15-20%; in the winter working condition (ambient temperature 5°C, solar irradiance 500 W / m²), the heat collection space 5 can raise the air temperature to 20-45°C, the heat gain coefficient of the wall 1 is increased to 0.48 W / (m²·K), and the building heat loss is reduced by more than 40%.

[0035] This application innovatively constructs the air flow form of "thermal pressure driving layer-airflow strengthening layer-accelerated convection layer". In this application, a heat collection space 5 is set at the top of the ventilation system structure to actively collect heat, so that it forms a significant temperature difference with the airflow space 4 below, and then a heat pressure belt is formed in the airflow space 4 and the heat collection space 5, which prompts the air in the low temperature area to actively flow to the high temperature area, forming a basic cycle. A middle air intake grille 8 is set in the middle of the photovoltaic panel. The pressure difference is formed inside and outside the middle air intake grille 8 due to the different air flow rates. The external air enters the airflow space 4 through the grille to accelerate the air in the airflow space 4. The air in the heat collection space 5 eventually flows to the interior of the building body to be used or discharged. In the above cycle, the air on the back of the photovoltaic panel is always in a flowing state during the operation of the photovoltaic panel, and the heat is difficult to store, so the temperature on the back of the photovoltaic panel naturally decreases. In addition, the flowing air on the back of the photovoltaic panel takes away part of the heat through heat exchange when passing through, reducing the temperature of the photovoltaic panel. One side of the top of the heat collection space 5 is closed by the top side panel 17.

[0036] See attached Figure 1 ~Attached Figure 5 and attached Figure 10 , the vertical lintel 26 is fixed at the bottom through a support, and the vertical lintel 26 bears the weight of the photovoltaic panel after being fixedly connected to the middle connecting piece 25. In the bottom air intake structure, the lower air intake plate 6 is fixed to the vertical lintel 26 through the mounting hole, and the lower edge of the lower air intake plate 6 is higher than the lower edge of the wall 1 to form a lower air inlet 7. When the airflow passes through the curtain wall, it enters from the lower air inlet 7 and flows upward. The upper photovoltaic panel 2 and the lower photovoltaic panel 3 absorb solar energy and convert it into electrical energy. At the same time, the waste heat generated during the power generation process heats the air in the airflow space 4, so that the airflow space 4 forms a thermal pressure difference with the outside world, creating conditions for the airflow to flow into the airflow space 4. In the heat collection space 5, the transparent vertical plate and the transparent cover plate work together to make the sunlight directly irradiate the heat absorption plate core 13 to form a high-temperature area, and continue to generate a thermal pressure difference with the airflow space 4 below, and the airflow flows continuously from bottom to top to the high-temperature area. The heat collection space 5 creates power for the airflow flow. A middle air intake grille 8 is arranged between the upper photovoltaic panel 2 and the lower photovoltaic panel 3. The guide vanes of the middle air intake grille 8 gradually rise from the outside to the inside. When the airflow enters, the direction is upward, which accelerates the internal airflow and accelerates the ventilation efficiency at the middle air intake grille 8, thereby improving the ventilation effect. In specific implementation, the guide vanes of the middle air intake grille 8 can adopt NACA airfoils to accelerate local airflow. Figure 1 , Attachment Figure 2 , Attachment Figure 8, the middle air intake grille 8 is fixed to the wall 1 through the connecting member 25 and connected to the vertical lintel 26 so that the vertical lintel 26 bears the gravity. In the heat collection space 5, the heat absorption plate core 13 is fixed between the air intake plate 11 and the air outlet 12 through the fixed shaft 13-1. The top end of the air intake plate 11 is lower than the air outlet 12, aiming to make the heat absorption plate core 13 face the direct sunlight direction and increase the heat absorption amount. It should be noted that the surface of the heat absorption plate core 13 has a heat absorption coating, which can be achieved by the existing technology, aiming to improve the photothermal conversion rate of the heat absorption plate core 13. The photothermal conversion rate of the heat absorption plate core 13 is preferably greater than 0.92. In the technical solution, the air intake plate 11 and the air outlet 12 have the same structure but different sizes. Ventilation holes 14 are opened on the surfaces of the air intake grille 11-2 and the air outlet grille 12-1 to increase the air flow efficiency. During specific implementation, a part of the heat absorption unit 15 can be installed as a guide vane in the grille frame 11-1 as the air intake grille 11-2 or the air outlet grille 12-1.

[0037] In this application, the heat absorption plate core 13 is provided to enhance the heat collection effect in the heat collection space 5. The heat absorption plate core 13 includes a plurality of heat absorption units 15, and the heat absorption units 15 are combined to form the heat absorption plate core 13. The heat absorption unit 15 forms a bending structure by arranging the staggered first trapezoidal fins 15-1 and the second trapezoidal fins 15-2. The bending structure can increase the heat absorption area and improve the heat absorption effect. The fins adopt a tapered type, which helps to form a reasonable heat flux density.

[0038] Refer to the appendix Figure 4 and the appendix Figure 6 , during specific implementation, the heat absorption units 15 can be combined according to the actual size requirements. The surface temperature of the heat absorption plate core 13 in the heat collection space 5 can form a temperature difference of 30~50°C with the air flow space 4, and the thermal pressure difference is 10~20 Pa, which can create a reliable air flow power source.

[0039] The heat in the heat collection space 5 is discharged into the building main body. It should be noted that the building main body can be a structure connected to the outside or the interior. Refer to the appendix Figure 1 ~the appendix Figure 5 and the appendix Figure 11 , the upper air outlet grille 20 can control the opening degree through the electric louver 23. In summer, the heat in the heat collection space 5 can be collected into the hot water system through the air outlet 24; in winter, the heat in the heat collection space 5 can be collected into the hot air system. In spring and autumn, the air outlet 24 can be closed, and the upper air outlet grille 20 can exhaust to the outside or the interior. At the same time, an insect-proof net 19 is provided in the heat collection space 5 to prevent flying insects from entering the interior or other systems.

[0040] In a second aspect, the present application provides a side air inlet structure. The lower air inlet plate 6 of the first solution is replaced with a heat absorption plate core 13. The heat absorption plate core 13 is in an upright shape, and the air flow contacts the fins from the side and then enters the air flow space 4 through the ventilation holes 14. The vertical heat absorption plate core 13 is fixed by being installed on the bottom support member through a side hanging plate 13-2. The fins with a bending and reducing structure achieve a gradient acceleration of the side air flow. When the air flow passes through the heat absorption plate core 13 at the bottom, the second trapezoidal fins 15-2 divert the front air flow to both sides, accelerating the air flow into the ventilation holes 14 on both sides; when the air flow flows laterally towards the second trapezoidal fins 15-2, the air flow is accelerated by the side of the reducing fins, forming an air pressure difference on the surface of the heat absorption plate core 13, and the air flow enters the ventilation holes 14. Specifically, it is a photovoltaic curtain wall ventilation system with a composite diversion and bionic fin heat exchange structure, including a wall body 1, an upper photovoltaic panel 2 and a lower photovoltaic panel 3 which are arranged at intervals outside the wall body 1. An air flow space 4 is formed between the wall body 1 and the upper photovoltaic panel 2 and the lower photovoltaic panel 3, and the wall body 1 extends longitudinally by a lower structural beam and horizontally extends into the interior of the building body at the top of the upper photovoltaic panel 2 to form a heat collection space 5 communicating with the interior of the building body between the top of the wall body 1 and the upper structural beam. The air flow space 4 communicates with the heat collection space 5. A heat absorption plate core 13 is provided at the bottom of the lower photovoltaic panel 3 to the level of the lower edge of the wall body 1. The heat absorption plate core 13 includes a number of heat absorption units 15 extending horizontally along the heat collection space 5. The heat absorption unit 15 includes a first trapezoidal fin 15-1, a second trapezoidal fin 15-2, and a transition fin 15-3 connecting the first trapezoidal fin 15-1 and the second trapezoidal fin 15-2. The height of the first trapezoidal fin 15-1 is lower than that of the second trapezoidal fin 15-2, and ventilation holes 14 are arranged in a matrix on the surfaces of the first trapezoidal fin 15-1 and the transition fin 15-3. The ventilation holes 14 communicate the outside air with the air flow space 4 in a direction perpendicular to the longitudinal wall body 1. The lower photovoltaic panel 3 and the upper photovoltaic panel 2 are arranged at intervals, and a middle air inlet grille 8 communicating with the air flow space 4 is provided at the interval. Transparent vertical plates 9 and transparent cover plates 10 for transmitting light to the heat collection space 5 are respectively provided at the top of the upper photovoltaic panel 2 and the top of the heat collection space 5. An air inlet plate 11 and an air outlet 12 are respectively provided at the top of the longitudinal wall body 1 and the middle and rear parts of the horizontal wall body 1 of the heat collection space 5. The height of the air inlet plate 11 is lower than that of the air outlet 12, and a heat absorption plate core 13 is erected between the top end of the air inlet plate 11 and the top end of the air outlet 12.The intake plate 11 includes a grille frame 11-1 and intake grilles 11-2 stacked in the grille frame 11-1. A number of ventilation holes 14 are arranged in a matrix on the surface of the intake grilles 11-2, and the intake grilles 11-2 gradually rise from the intake front end to the intake rear end; the air outlet 12 includes a grille frame 11-1 and outlet grilles 12-1 stacked in the grille frame 11-1. A number of ventilation holes 14 are arranged in a matrix on the surface of the outlet grilles 12-1, and the outlet grilles 12-1 gradually rise from the outlet front end to the outlet rear end.

[0041] In a third aspect, the present application provides a heat collection structure of a fin group 16, specifically a photovoltaic curtain wall ventilation system with a composite diversion and bionic fin heat exchange structure, including a wall 1, an upper photovoltaic panel 2 and a lower photovoltaic panel 3 spaced outside the wall 1. An air flow space 4 is formed between the wall 1, the upper photovoltaic panel 2 and the lower photovoltaic panel 3, and the wall 1 extends longitudinally from a lower structural beam and horizontally extends inside the building body at the top of the upper photovoltaic panel 2 to form a heat collection space 5 communicating with the inside of the building body between the top of the wall 1 and the upper structural beam. The air flow space 4 communicates with the heat collection space 5. The lower end of the lower photovoltaic panel 3 is connected to a lower intake plate 6 with a bottom edge higher than the lower edge of the wall 1 so that a lower intake port 7 communicating with the air flow space 4 is formed below the lower intake plate 6; the lower photovoltaic panel 3 and the upper photovoltaic panel 2 are spaced apart and a middle intake grille 8 communicating with the air flow space 4 is provided at the interval; in the heat collection space 5, a fin group 16 and an air outlet 12 are sequentially arranged from the front side in the intake direction of the horizontal wall 1 to the rear side in the intake direction. The fin group 16 includes a number of rectangular fins 16-1, and the fins 16-1 are perpendicular to both the horizontal wall 1 and the light-transmitting vertical plate 9 at the same time. The fins 16-1 are connected in series and combined through fin fixing rods 16-2. The air outlet 12 includes a grille frame 11-1 and outlet grilles 12-1 stacked in the grille frame 11-1. A number of ventilation holes 14 are arranged in a matrix on the surface of the outlet grilles 12-1, and the outlet grilles 12-1 gradually rise from the outlet front end to the outlet rear end.

[0042] In a fourth aspect, the present application provides a bottom air intake structure. An endothermic unit 15 is installed at the bottom of the air flow space 4 to enhance the bottom air intake effect and strengthen the air flow circulation. Specifically, an endothermic unit 15 is horizontally provided at the bottom of the air flow space 4 in the photovoltaic curtain wall system with bottom air intake and at a position flush with the lower edge of the lower intake plate 6. The ventilation holes 14 of the endothermic unit 15 communicate the outside air with the air flow space 4 in the vertical direction.

[0043] For further optimization of the structural forms of the above four photovoltaic curtain wall systems, a drain outlet 8-1 is provided at the lower end of the middle air intake grille 8, a rain shield 18 connected to the drain outlet 8-1 is provided in the air flow space 4, and an arc transition is formed between the lower end of the rain shield 18 and the drain outlet 8-1; the top end of the rain shield 18 is higher than the top end of the middle air intake grille 8; an insect screen 19 is provided in the heat collection space 5 between the air outlet 12 and the rear end of the horizontal wall 1, and an upper air outlet grille 20 is provided at the place where the heat collection space 5 communicates with the building main body. A rain shield 18 is arranged behind the middle air intake grille 8. Besides the rain shielding function, the rain shield 18 also has the function of accelerating the air flow. Specifically, the lower part of the rain shield 18 and the drain outlet 8-1 are in arc transition, and the upper part is a rectangular strip, forming a rain retaining wall, and cooperating with the middle air intake grille 8 to form a three-dimensional drainage path. At the same time, in the air flow space 4, the arc transition section reduces the air flow through area, and uses the Venturi effect to accelerate the air flow to achieve turbulent heat transfer.

[0044] Refer to the appendix Figure 8 In this application, the connecting member 25 is fixed to the wall 1, and then each component can be installed on the connecting member 25. The cross sections of the invisible support plate 21 and the invisible decorative plate 22 are U-shaped, and photovoltaic panels are embedded in the U-shaped structure. In specific implementation, the invisible support plate 21 and the invisible decorative plate 22 are fixed to the slide rail 27 through dovetail screws, and the slide rail 27 is used to adjust the inclination angles on both sides of the photovoltaic panel during the installation process.

[0045] In addition, this application realizes multiple applications of the heat absorption plate core 13. At different positions, the functions of the heat absorption plate core 13 or the heat absorption unit 15 are different, and conventional improvements are also made according to different installation positions. For example, the heat absorption plate core 13 in the heat collection space 5 can be coated with a heat absorption coating, but the heat absorption plate core 13 for side air intake does not need to be coated with a heat absorption coating. For another example, by intercepting part of the heat absorption unit 15, it can be used as the air intake grille 11-2 and the air outlet grille 12-1, and can also be used as a component to strengthen the bottom air intake.

[0046] This application is verified by numerical simulation and is found to have the following significant advantages: Efficient heat exchange and photovoltaic panel cooling: Through the innovative air flow circulation design, the air on the back of the photovoltaic panel is always in a flowing state, and heat is difficult to store, thus effectively reducing the temperature of the photovoltaic panel. Experiments show that the temperature of the photovoltaic panel can be reduced by 20°C to 40°C, significantly improving its power generation efficiency. Under high temperature conditions in summer, the temperature of the photovoltaic panel is relatively high, and the power generation efficiency will be affected. After adopting this ventilation system, the power generation loss caused by temperature rise can be reduced, and the economic benefit of photovoltaic power generation can be improved.

[0047] Adapting to the requirements of different seasons: In winter, the system can collect heat to insulate the cavity, reduce indoor temperature fluctuations, improve indoor comfort, and at the same time help maintain the overall performance stability of the photovoltaic curtain wall.

[0048] Optimizing building energy consumption: Adapting the photovoltaic curtain wall system to the building main body avoids heat dissipation to Building Wall 1, which conforms to the concept of green buildings. By reasonably utilizing the heat collected in the heat collection space 5, such as using it for the hot water system or the hot air system, the building's energy consumption can be reduced, carbon emissions can be lowered, and the building's energy utilization efficiency can be improved.

[0049] What is not described in this application can be achieved by adopting or referring to existing technologies.

[0050] The above are only examples of this application and are not used to limit this application. For those skilled in the art, various changes and modifications can be made to this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included within the scope of the claims of this application.

Claims

1. A photovoltaic curtain wall ventilation system with a composite flow guiding and bionic fin heat exchange structure, comprising a wall body, and an upper photovoltaic panel and a lower photovoltaic panel spaced outside the wall body. An air flow space is formed between the wall body and the upper and lower photovoltaic panels, and the wall body extends longitudinally from a lower structural beam and horizontally extends into the building main body at the top of the upper photovoltaic panel to form a heat collection space communicating with the inside of the building main body between the top of the wall body and an upper structural beam. The air flow space communicates with the heat collection space, and is characterized in that the lower end of the lower photovoltaic panel is connected to a lower air inlet plate with a bottom edge higher than the lower edge of the wall body, so as to form a lower air inlet communicating with the air flow space below the lower air inlet plate; the lower photovoltaic panel and the upper photovoltaic panel are spaced apart, and a middle air inlet grille communicating with the air flow space is provided at the interval; light-transmitting vertical plates and light-transmitting covers for transmitting light to the heat collection space are respectively provided at the top of the upper photovoltaic panel and the top of the heat collection space; an air inlet plate and an air outlet are respectively provided at the top of the longitudinal wall body and the middle and rear parts of the horizontal wall body in the heat collection space. The height of the air inlet plate is lower than that of the air outlet, and a heat absorption plate core is erected between the top end of the air inlet plate and the top end of the air outlet.

2. The photovoltaic curtain wall ventilation system with a composite flow guiding and bionic fin heat exchange structure according to claim 1, characterized in that the air inlet plate includes a grille frame and air inlet grilles stacked in the grille frame. A plurality of ventilation holes are arranged in a matrix on the surface of the air inlet grilles, and the air inlet grilles gradually rise from the air inlet front end to the air inlet rear end; the air outlet includes a grille frame and air outlet grilles stacked in the grille frame. A plurality of ventilation holes are arranged in a matrix on the surface of the air outlet grilles, and the air outlet grilles gradually rise from the air outlet front end to the air outlet rear end; the heat absorption plate core includes a plurality of heat absorption units extending transversely in the heat collection space. The heat absorption unit includes a first trapezoidal fin, a second trapezoidal fin, and a transition fin connecting the first trapezoidal fin and the second trapezoidal fin. The height of the first trapezoidal fin is lower than that of the second trapezoidal fin, and ventilation holes are arranged in a matrix on the surfaces of the first trapezoidal fin and the transition fin.

3. A photovoltaic curtain wall ventilation system with a composite flow guiding and bionic fin heat exchange structure, comprising a wall body, and an upper photovoltaic panel and a lower photovoltaic panel spaced outside the wall body. An air flow space is formed between the wall body and the upper and lower photovoltaic panels, and the wall body extends longitudinally from a lower structural beam and horizontally extends into the building main body at the top of the upper photovoltaic panel to form a heat collection space communicating with the inside of the building main body between the top of the wall body and an upper structural beam. The air flow space communicates with the heat collection space, and is characterized in that An endothermic plate core is provided from the bottom of the lower photovoltaic panel to the position flush with the lower edge of the wall body. The endothermic plate core includes a number of endothermic units extending horizontally along the heat collection space. The endothermic unit includes a first trapezoidal fin, a second trapezoidal fin, and a transition fin connecting the first trapezoidal fin and the second trapezoidal fin. The height of the first trapezoidal fin is lower than that of the second trapezoidal fin, and ventilation holes are arranged in a matrix on the surfaces of the first trapezoidal fin and the transition fin. The ventilation holes communicate the outside air with the air flow space in the direction perpendicular to the longitudinal wall body. The lower photovoltaic panel and the upper photovoltaic panel are arranged at intervals, and a middle air intake grille communicating with the air flow space is provided at the interval. A light-transmitting vertical plate and a light-transmitting cover plate for transmitting light to the heat collection space are respectively provided at the top of the upper photovoltaic panel and the top of the heat collection space. An air intake plate and an air outlet are respectively provided at the top of the longitudinal wall body and the rear middle part of the horizontal wall body in the heat collection space. The height of the air intake plate is lower than that of the air outlet, and the top end of the air intake plate and the top end of the air outlet support an endothermic plate core.

4. The photovoltaic curtain wall ventilation system with a composite flow guiding and bionic fin heat exchange structure according to claim 3, characterized in that The air intake plate includes a grille frame and air intake grilles stacked in the grille frame. A number of ventilation holes are arranged in a matrix on the surface of the air intake grille, and the air intake grille gradually rises from the air intake front end to the air intake rear end. The air outlet includes a grille frame and air outlet grilles stacked in the grille frame. A number of ventilation holes are arranged in a matrix on the surface of the air outlet grille, and the air outlet grille gradually rises from the air outlet front end to the air outlet rear end.

5. A photovoltaic curtain wall ventilation system with a composite flow guiding and bionic fin heat exchange structure, including a wall body, and an upper photovoltaic panel and a lower photovoltaic panel arranged at intervals outside the wall body. An air flow space is formed between the wall body and the upper and lower photovoltaic panels. The wall body extends longitudinally from a lower structural beam and extends horizontally into the building main body at the top of the upper photovoltaic panel to form a heat collection space communicating with the inside of the building main body between the top of the wall body and an upper structural beam. The air flow space communicates with the heat collection space. It is characterized in that An endothermic plate core is provided from the bottom of the lower photovoltaic panel to the position flush with the lower edge of the wall body. The endothermic plate core includes a number of endothermic units extending horizontally along the heat collection space. The endothermic unit includes a first trapezoidal fin, a second trapezoidal fin, and a transition fin connecting the first trapezoidal fin and the second trapezoidal fin. The height of the first trapezoidal fin is lower than that of the second trapezoidal fin, and ventilation holes are arranged in a matrix on the surfaces of the first trapezoidal fin and the transition fin. The ventilation holes communicate the outside air with the air flow space in the direction perpendicular to the longitudinal wall body. The lower photovoltaic panel and the upper photovoltaic panel are arranged at intervals, and a middle air intake grille communicating with the air flow space is provided at the interval. A light-transmitting vertical plate and a light-transmitting cover plate for transmitting light to the heat collection space are respectively provided at the top of the upper photovoltaic panel and the top of the heat collection space. The heat collection space is sequentially provided with a fin group and an air outlet from the front side to the rear side in the air inlet direction along the horizontal wall. The fin group includes a plurality of rectangular fins, and the fins are perpendicular to both the horizontal wall and the light-transmitting vertical plate at the same time.

6. The photovoltaic curtain wall ventilation system with a composite flow guiding and bionic fin heat exchange structure according to claim 5, characterized in that The air outlet includes a grille frame and air outlet grilles stacked in the grille frame. A plurality of ventilation holes are arranged in a matrix on the surface of the air outlet grilles, and the air outlet grilles gradually rise from the front end of the air outlet to the rear end of the air outlet.

7. A photovoltaic curtain wall ventilation system with a composite flow guiding and bionic fin heat exchange structure, including a wall and an upper photovoltaic panel and a lower photovoltaic panel arranged at intervals outside the wall. An air flow space is formed between the wall and the upper photovoltaic panel and the lower photovoltaic panel, and the wall longitudinally extends from a lower structural beam and horizontally extends into the building main body at the top of the upper photovoltaic panel to form a heat collection space communicating with the inside of the building main body between the top of the wall and the upper structural beam. The air flow space communicates with the heat collection space. It is characterized in that The lower end of the lower photovoltaic panel is connected to a lower air inlet plate with a bottom edge higher than the lower edge of the wall, so as to form a lower air inlet communicating with the air flow space below the lower air inlet plate; The lower photovoltaic panel and the upper photovoltaic panel are arranged at intervals, and a middle air inlet grille communicating with the air flow space is provided at the interval; The heat collection space is sequentially provided with a fin group and an air outlet from the front side to the rear side in the air inlet direction along the horizontal wall. The fin group includes a plurality of rectangular fins, and the fins are perpendicular to both the horizontal wall and the light-transmitting vertical plate at the same time.

8. The photovoltaic curtain wall ventilation system with a composite flow guiding and bionic fin heat exchange structure according to claim 7, characterized in that The air outlet includes a grille frame and air outlet grilles stacked in the grille frame. A plurality of ventilation holes are arranged in a matrix on the surface of the air outlet grilles, and the air outlet grilles gradually rise from the front end of the air outlet to the rear end of the air outlet.

9. The photovoltaic curtain wall ventilation system with a composite flow guiding and bionic fin heat exchange structure according to any one of claims 2 and 8, characterized in that A heat absorption unit is horizontally arranged at the bottom of the air flow space and at a position flush with the lower edge of the lower air inlet plate. The ventilation holes of the heat absorption unit communicate the outside air with the air flow space in the vertical direction.

10. The photovoltaic curtain wall ventilation system with a composite flow guiding and bionic fin heat exchange structure according to any one of claims 1-8, characterized in that A drain outlet is provided at the lower end of the middle air inlet grille. A rain shield connected to the drain outlet is provided in the air flow space, and an arc transition is formed between the lower end of the rain shield and the drain outlet; the top end of the rain shield is higher than the top end of the middle air inlet grille; An insect-proof net is provided in the heat collection space between the air outlet and the rear end of the horizontal wall, and an upper air outlet grille is provided at the place where the heat collection space communicates with the building main body.

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