A solar-powered air supply system

Abstract

This invention provides a solar-powered air supply system, comprising a heat collector, an outlet pipe, a return pipe, and a user. Air is heated in the heat collector, delivered to the user's inlet pipe through the outlet pipe, and then enters the user's air supply system. Return air then enters the heat collector through the return pipe for heating. The system is characterized by the inclusion of a hot air regulating device and a mixing air regulating device within the user's inlet pipe. The hot air regulating device is located upstream of the mixing air regulating device, and a cold air input pipe is positioned between them. Both the hot air regulating device and the mixing air regulating device have a multi-grid structure, with adjacent grids forming a split-opening adjustable structure. This invention provides a novel solar-powered air supply system that achieves further temperature uniformity.

Description

Technical Field

[0001] This invention belongs to the field of solar energy, and in particular relates to a solar-powered air supply system. Background Technology

[0002] With the rapid development of modern society and economy, human demand for energy is increasing. However, the reserves of traditional energy sources such as coal, oil, and natural gas are constantly decreasing and becoming increasingly scarce, leading to continuous price increases. At the same time, the environmental pollution caused by conventional fossil fuels is becoming increasingly serious, all of which greatly restrict social development and the improvement of human quality of life. Energy issues have become one of the most prominent problems in the contemporary world. Therefore, the search for new energy sources, especially pollution-free clean energy, has become a hot research topic.

[0003] Solar energy is a clean, inexhaustible energy source with enormous reserves; the total amount of solar radiation received by the Earth's surface each year is 1 × 10⁻⁶. 18 Solar energy, with a capacity of kW·h, is more than ten thousand times the world's total annual energy consumption. Countries worldwide have made solar energy utilization a key aspect of new energy development. However, the low energy density of solar radiation reaching the Earth (approximately one kilowatt per square meter) and its discontinuous nature pose challenges to large-scale development and utilization. Therefore, to widely utilize solar energy, not only are technical issues to be resolved, but it must also be economically competitive with conventional energy sources.

[0004] In solar thermal air systems, the stability and accuracy of airflow measurement are crucial, and are one of the important factors in improving the economy and stability of the thermal system. However, uneven flow velocity is a common problem in the air ducts of solar systems. Due to the complexity of actual operating conditions, the unfavorable guiding effect of existing regulating devices on the flow field, and the defects of airflow measurement instruments, abnormal fluctuations in airflow measurement and poor damper adjustment characteristics occur, resulting in a large deviation between the measured primary airflow and the actual airflow. In recent years, the structure of primary air duct systems has become increasingly compact, the primary air duct distance is shorter, and the presence of conventional regulating dampers makes the flow field inside the duct more complex, even leading to phenomena where the airflow measured by the airflow measurement device and the damper opening change are opposite.

[0005] However, current solutions focus on improving the accuracy of measuring instruments and installing more flow equalization devices, which do not fundamentally solve the problem caused by uneven upstream airflow velocity. Furthermore, installing more flow equalization devices complicates the primary air duct structure, increases costs, and leads to a significant pressure drop, thereby increasing operating costs.

[0006] Therefore, based on the above problems, a new type of flow equalization device is needed. The flow equalization of the solar air supply duct needs to be improved to improve the flow field and temperature field at the measuring device under the premise of smaller pressure loss, improve the accuracy and stability of the inlet air volume and temperature measurement of the solar system, and at the same time improve the heat exchange efficiency of the heat exchange system that mixes hot and cold air. Summary of the Invention

[0007] This invention provides a novel solar-powered air supply system, thereby solving the aforementioned technical problems.

[0008] To achieve the above objectives, the technical solution of the present invention is as follows:

[0009] A solar-powered air supply system includes a heat collector, an outlet pipe, a return pipe, and a user. Air is heated in the heat collector, delivered to the user's inlet pipe through the outlet pipe, and then enters the user's air supply. Return air enters the heat collector through the return pipe for heating. The system is characterized by the installation of a hot air regulating device and a mixing air regulating device within the user's inlet pipe, with the hot air regulating device located upstream of the mixing air regulating device. A cold air input pipe is installed between the hot air regulating device and the mixing air regulating device. The hot air regulating device and the mixing air regulating device are multi-grid structures, with adjacent grids forming a split-opening regulating structure.

[0010] Preferably, the hot air regulating device and the mixing air regulating device are arranged in different directions, with the grille of the hot air regulating device opening horizontally and the grille of the mixing air regulating device opening vertically, or the grille of the hot air regulating device opening vertically and the grille of the mixing air regulating device opening horizontally.

[0011] Preferably, a cold air regulating device is provided on the cold air inlet pipe. The cold air regulating device has a multi-grid structure, and the adjacent grids have a split-opening regulating structure.

[0012] Preferably, the angle of the grid can be finely adjusted according to the distribution of the incoming flow velocity, as follows:

[0013] a / A=э*(VV p ) / V p Where 'a' is the changing angle of the grid plate, and 'V' is the local velocity near the grid plate. p Let be the cross-sectional average velocity, and angle A be the current angle of the grid plate. Where э is a parameter, using the following data:

[0014] 0 <A<=30°,0.53<э<0.58;

[0015] 30 <A<=60°,0.46<э<0.53;

[0016] 60 <A<90°,0.42<э<0.46;

[0017] The maximum value of A is 90°.

[0018] As a preferred option, as A increases, э decreases.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1) Based on existing solar duct systems, a novel inlet airflow regulation system with flow regulation, rectification, and flow equalization functions is proposed. This system includes two multi-bladed opposing regulating devices upstream and downstream, enabling dual control and dual flow equalization. It addresses the root cause of uneven inlet airflow velocity, resulting in significant flow equalization and improved accuracy and stability of inlet airflow and temperature measurements, thereby enhancing the system's economy and stability. Furthermore, the device's simple structure avoids the excessive pressure drop and increased operating costs associated with additional flow equalization devices in existing technologies, offering high economic benefits.

[0021] 2) Based on the existing solar energy system, a creative air supply system with flow regulation, rectification and flow equalization functions is proposed. By setting grid plates and setting different angles of the grid plates, the overall heat exchange efficiency of hot and cold air mixing heat exchange is improved. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the air supply system of the present invention;

[0023] Figure 2 This is a schematic diagram of the air volume regulating heat exchange system of the present invention;

[0024] Figure 3 This is a partial three-dimensional structural diagram of the air volume regulating device of the present invention;

[0025] Figure 4 A schematic diagram of a non-split grid structure;

[0026] Figure 5 This is a schematic diagram of a split adjustable grille structure. Detailed Implementation

[0027] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0028] Unless otherwise specified, in this article, " / " represents division, and "×" and "*" represent multiplication.

[0029] Figure 1A solar-powered air supply system is disclosed. The system includes a heat collection device 1, an outlet pipe 2, a return pipe 3, and a user 4. The air is heated in the heat collection device, delivered to the user inlet pipe through the outlet pipe 2, and then enters the user 4 through the user inlet pipe for air supply. The return air then enters the heat collection device through the return pipe 3 for heating.

[0030] The outlet pipe 2 is connected to the user's main pipe 5, and the user's hot air inlet pipe 6 is connected to the main pipe 5.

[0031] A hot air regulating device (flow regulating device) 7 and a mixed air regulating device (flow regulating device) 8 are installed in the user hot air inlet pipe 6. The hot air regulating device 7 is located upstream of the mixed air regulating device 8. A cold air input pipe 9 is installed between the hot air regulating device 7 and the mixed air regulating device 8. The hot air regulating device and the mixed air regulating device are multi-grid structures, and the adjacent grids are open-ended regulating structures.

[0032] like Figure 2 As shown, the cold air inlet pipe 9 and the hot air inlet pipe 6 are set perpendicularly.

[0033] The indoor temperature is regulated by introducing cool air to avoid it becoming too high or too low.

[0034] like Figure 3 As shown in Figure 5, the hot air regulating device 7 is a grille structure with multiple grille plates arranged perpendicular to the central axis of the cold air inlet pipe.

[0035] Based on existing solar-powered hot air systems, a novel inlet flow regulation system with functions of flow control, rectification, and flow equalization is proposed. This system comprises two opposing regulating devices, upstream and downstream, enabling dual control and dual flow equalization. It addresses the root cause of uneven inlet fluid velocity, resulting in significant flow equalization and improved accuracy and stability of inlet flow and temperature measurements. This, in turn, enhances the economy and stability of the heat exchange system. Furthermore, the device's simple structure avoids the excessive pressure drop and increased operating costs associated with additional flow equalization devices in existing technologies, offering high economic benefits.

[0036] Preferably, a mixing air regulating device 8 is installed in the mixing air outlet pipe 11 downstream of the hot air inlet pipe 6. This mixing air regulating device is a grid structure with multiple grid plates arranged parallel to the central axis of the cold air inlet pipe. When the regulating device is partially open, each set of two opposing grid plates can guide the flow to both sides. The flow regulating device 7 allows the flow velocity to diffuse horizontally, and the flow regulating device 8 allows the flow velocity to diffuse vertically. When flow regulating devices 7 and 8 are combined, because the two sets of fluid gates are perpendicular to each other, the flow can diffuse in all four directions (horizontal and vertical), resulting in a higher degree of homogenization.

[0037] Preferably, a mixing device 12 is provided downstream of the mixing air regulating device. The mixing device is a grid structure, which includes multiple grids.

[0038] Preferably, multiple mixing devices are provided. The mixing mechanism grille includes a parallel structure arranged parallel to the central axis of the cold air inlet duct and a vertical structure arranged perpendicular to the central axis of the cold air inlet duct, with the parallel and vertical structures alternating. After the mixing devices are combined, because the two sets of fluid gates are perpendicular to each other, the flow can be diffused in all four directions, both horizontally and vertically, resulting in a higher degree of homogenization.

[0039] When adjacent grilles are not installed in a bi-directional configuration, the angle between the grille and the central axis of the cold air inlet pipe should be chosen to be the angle formed by the direction of cold air flow and the downstream extension of the grille. For example... Figure 4 Angle A is included.

[0040] The adjacent grille plates of the hot air conditioning device have different tilt angles. As the distance from the cold air inlet duct increases, the angle between the grille plate and the direction of cold air flow along the central axis of the cold air inlet duct becomes larger and larger.

[0041] Near the cold air inlet, the cold air flow is at its maximum, resulting in the largest temperature difference and optimal heat exchange. However, this leads to uneven heat exchange overall. Heat exchange is best at the cold air outlet, decreasing with distance from the outlet, resulting in poor overall heat exchange performance, similar to a co-current heat exchanger. The cold air flow decreases with distance from the inlet. This invention addresses this by improving the grille angle, increasing the hot air flow along the direction of the cold air inlet channel, resulting in more balanced heat exchange across the entire heat exchange area, achieving a counter-current heat exchange effect and improving overall heat exchange efficiency.

[0042] Preferably, as the distance from the cold air inlet duct increases, the angle between the hot air regulating device's grille and the direction of cold air flow along the central axis of the cold air inlet duct gradually increases. This variation in angle improves heat exchange efficiency and achieves more uniform overall heat exchange.

[0043] Preferably, the adjacent grilles are a split-opening adjustable structure, such as... Figure 3 , 5 As shown. Unless otherwise specified, the following descriptions refer to adjacent grilles with a split structure.

[0044] Fluid flow needs to be controlled. The split-type regulating fluid gate of this invention has both flow equalization and flow regulation functions. Previously, ordinary fluid gates (fluid gates facing one direction) were generally used to control flow, with orifice plates used for flow equalization. However, ordinary fluid gates divert hot air from one side to the other, exacerbating flow turbulence within the pipe. Orifice plates, on the other hand, significantly reduce the flow area, resulting in higher resistance.

[0045] As long as the double-leaf fluid gate is not nearly closed, it has minimal impact on the flow area. The grille of the double-leaf fluid gate causes the fluid to flow around the sides of the grille, rather than being guided to one side like a regular fluid gate. This process applies some resistance to the flow, reducing the flow velocity in areas of higher velocity and inducing the fluid to flow through areas of lower velocity. In particular, using two sets of mutually perpendicular double-leaf fluid gates provides better flow equalization. Furthermore, changing the angle of the double-leaf fluid gate grille (the angle between the grille and the axis of the cooling air duct) can also regulate the flow rate.

[0046] Preferably, the cold air flow regulating device 10 has a multi-grid structure, with adjacent grids having a split-opening adjustment structure. By setting the split-opening adjustment structure, the incoming cold air flow can be made uniform.

[0047] Preferably, the hot air regulating device 7, the cold air flow regulating device 10, and the mixing air regulating device 8 are adjusted independently of each other. When the fluid gate opening is different, the flow resistance is different, and the flow uniformity effect is also different. When the equipment can withstand a larger flow resistance, a smaller fluid gate opening can be used to achieve a better flow uniformity effect.

[0048] Preferably, in the multi-leaf split-opening adjustment, each grille can have its angle independently controlled, preferably by a servo motor, making its opening angle independently adjustable. When the local flow velocity is too high, nearby grilles can adopt a smaller angle, thereby increasing local resistance and causing the gas to move in the direction of lower flow velocity, further improving the uniformity of the flow field. Each grille's opening angle is controlled by a servo motor.

[0049] Preferably, the width of each grid in the multi-leaf split-flow regulating device can be determined according to the actual fluid distribution in the pipeline. Preferably, the pipeline diameter is 9-11 times the grid spacing, more preferably 10 times. These dimensions result in a significant flow equalization effect, improving the accuracy and stability of inlet flow and temperature measurements, thereby enhancing the system's economy and stability. Furthermore, the device has a simple structure, avoiding the excessive pressure drop and increased operating costs associated with additional flow equalization devices in existing flow equalization technologies, thus offering high economic benefits.

[0050] Furthermore, the flow regulation system, due to its split configuration, not only has flow regulation function but also rectification and flow equalization functions.

[0051] Furthermore, the flow regulation system can achieve dual control and dual flow equalization to achieve better flow equalization. The hot air from the hot air inlet pipe first passes through the hot air regulating device. After passing through the flow regulating device, its rectification effect makes the hot air velocity distribution more uniform. Then, cold air is introduced. Due to the difference in temperature and velocity of the cold air, the velocity and temperature of the mixed fluid are uneven. The mixed fluid passes through the second multi-bladed split flow regulating device again. After passing through the second flow regulating device, better velocity and temperature uniformity distribution can be achieved.

[0052] Furthermore, in the multi-blade opposing flow regulating device, the angle of each grille is independently adjustable. Preferably, the opening angle of each grille is controlled by a servo motor. Since the pressure loss caused by the grilles at different opening angles varies, resulting in different rectification and flow equalization effects, and since the hot air main pipe and the hot air inlet pipe form a T-shaped structure, the incoming hot air itself has uneven velocity. Therefore, the grille angle can be finely adjusted according to the velocity distribution of the incoming flow. Preferably, the device includes a mixing air regulating device 8 for adjustment.

[0053] Preferably, a / A = э*(VV) p ) / V p Where 'a' is the changing angle of the grid plate, and 'V' is the local velocity near the grid plate. p Let be the cross-sectional average velocity, and angle A be the current angle of the grid plate. Where э is a parameter, using the following data:

[0054] 0 <A<=30°,0.53<э<0.58;

[0055] 30 <A<=60°,0.46<э<0.53;

[0056] 60 <A<90°,0.42<э<0.46;

[0057] The maximum value of A is 90°.

[0058] As a preferred option, as A increases, э decreases.

[0059] When the angle of the grid plates is small (tending to a closed state), the flow resistance is high; conversely, when the angle of the grid plates is large (tending to open), the flow resistance is low. If the flow velocity is high in a certain area, the nearby grid plates should use a small angle (tending to a closed state) to induce the fluid to flow towards the area with a larger grid plate angle, thus achieving a flow equalization effect. If all grid plates have the same angle, although a flow equalization effect can still be achieved, the effect is less pronounced.

[0060] The formulas and parameters described above in this invention are the optimal angle adjustment parameters obtained through a large number of experiments and numerical simulations. By adjusting the angles described above, the best flow uniformity effect can be achieved with minimal resistance.

[0061] Preferably, a velocity probe, such as a Pitot tube, is placed near each grille. The opening angle is the angle between the grille and the axis of the cold air duct. Figure 5 As shown.

[0062] When adjacent grilles are configured as a pair, the angle between the grille and the central axis of the cold air inlet pipe (i.e., the grille angle) should be an acute angle, such as... Figure 5 As shown.

[0063] Furthermore, the width of each grid in the multi-leaf split flow regulating device can be determined according to the actual fluid distribution in the pipeline. Preferably, the width is equal to the grid spacing, and the grid spacing is equal to the pipeline diameter / 10. This is because different grid sizes will result in different pressure losses and different rectification and flow equalization effects. The width can be determined according to the velocity and temperature distribution of the incoming fluid to achieve a better flow equalization effect.

[0064] As an improvement, the angle of the hot air regulating device's grille increases with distance from the cold air inlet. Near the cold air inlet, the cold air flow is at its maximum, resulting in the largest temperature difference and optimal heat exchange. This leads to uneven heat exchange overall, with the best heat exchange occurring at the cold air outlet. Heat exchange deteriorates with distance from the outlet, resulting in poor overall heat exchange performance, similar to a co-current heat exchanger. Furthermore, the cold air flow decreases with distance from the cold air inlet. This invention improves the grille angle, increasing the hot air flow along the direction of the cold air inlet fluid channel, resulting in more balanced heat exchange across the entire heat exchange area, achieving a similar effect to counter-current heat exchange and improving overall heat exchange efficiency.

[0065] Preferably, the angle of the hot air regulating device's grille increases progressively as the distance to the cold air inlet decreases. This variation in angle enhances heat exchange efficiency and achieves more uniform overall heat distribution.

[0066] As an improvement, the size of the hot air regulating device's grille increases with distance from the cold air inlet. Near the cold air inlet, the cold air flow is at its maximum, resulting in the largest temperature difference and optimal heat exchange. This leads to uneven heat exchange overall, with the best heat exchange occurring at the cold air outlet. Heat exchange deteriorates with distance from the outlet, resulting in poor overall heat exchange performance, similar to a co-current heat exchanger. Furthermore, the cold air flow decreases with distance from the cold air inlet. This invention improves the grille size by varying it along the direction of the cold air inlet fluid channel. The grille size is largest near the cold air inlet, resulting in maximum resistance and reduced flow. Consequently, the flow increases with distance from the cold air outlet, achieving a more balanced heat exchange across the entire heat exchange area, creating a counter-current heat exchange effect and improving overall heat exchange efficiency.

[0067] Preferably, the size of the hot air conditioning device's grille increases progressively with increasing distance from the cold air inlet. This variation in size improves heat exchange efficiency and ensures more uniform overall heat distribution.

[0068] As an improvement, the distribution density of the hot air regulating device's grilles increases with distance from the cold air inlet. Near the cold air inlet, the cold air flow is maximum, resulting in the largest temperature difference and optimal heat exchange. This leads to uneven heat exchange overall, with the best heat exchange at the cold air outlet, decreasing with distance, resulting in poor overall heat exchange performance, similar to a co-current heat exchanger. Furthermore, the cold air flow decreases with distance from the cold air inlet. This invention improves the grille distribution density, varying it along the direction of the cold air inlet fluid channel. The grille distribution is largest near the cold air inlet, resulting in maximum resistance and reduced flow. Consequently, the flow increases with distance from the cold air outlet, achieving a more balanced heat exchange across the entire heat exchange area, creating a counter-current heat exchange effect and improving overall heat exchange efficiency.

[0069] Preferably, the distribution density of the hot air conditioning device's grilles increases progressively with increasing distance from the cold air inlet. This variation in distribution density enhances heat exchange efficiency and achieves more uniform overall heat exchange.

[0070] Preferably, the system also includes a main duct that transports hot air. Multiple hot air inlet pipes 6 are connected in parallel to the main duct. Along the flow direction of the hot air within the main duct, the angle between the hot air flow regulating device 7 in the hot air inlet pipe 6 and the grille in the mixing air regulating device 8 increases. Because the increasing angle of the grille reduces flow resistance, it ensures that the flow rate entering the hot air inlet pipe 6 remains uniform along the flow direction of the hot air within the main duct, preventing excessive flow in the upstream hot air inlet pipe 6 and insufficient flow at the downstream end.

[0071] Preferably, along the flow direction of the hot air in the main duct, the angle between the hot air flow regulating device 7 in the hot air inlet duct and the grille in the outlet air flow regulating device 7 gradually increases. By changing the angle, the uniformity of the flow distribution can be further ensured.

[0072] Preferably, multiple hot air inlet pipes 6 are connected in parallel to the main duct. Along the flow direction of hot air in the main duct, the distribution density of the grilles in the hot air flow regulating device 7 and the mixing air regulating device 8 in the hot air inlet pipes gradually decreases. Because the flow resistance decreases due to the decreasing grille distribution density, it ensures that the flow rate entering the hot air inlet pipes 6 along the flow direction of hot air in the main duct remains uniform, avoiding excessive flow in the upstream hot air inlet pipes 6 and insufficient flow in the downstream pipes.

[0073] Preferably, along the flow direction of the hot air in the main duct, the distribution density angle of the grilles in the hot air inlet duct of the hot air flow regulating device 7 and the mixing air regulating device 8 gradually decreases. By changing the amplitude, the uniformity of the flow distribution can be further ensured.

[0074] Temperature sensors are installed in the hot air duct, and thermometers are installed downstream of the mixing air regulating device 8 in the hot air inlet duct 6 to detect the temperature of the hot air and the heat-exchange fluid after mixing.

[0075] Preferably, a hot air flow meter is installed upstream of the flow regulating device 7 of the hot air inlet pipe 6 to measure the amount of hot air entering the hot air inlet pipe 6, and a cold air flow meter is installed on the cold air pipe to measure the flow rate of the cold air.

[0076] Preferably, when the measured hot air flow rate is lower than a preset value, the controller increases the opening of the hot air flow rate regulating device 7, thereby increasing the amount of hot air entering. When the detected hot air flow rate is higher than a preset value, the controller decreases the opening of the hot air flow rate regulating device 7, thereby reducing the amount of hot air entering.

[0077] Preferably, when the measured hot air temperature decreases, the controller increases the opening of the hot air flow regulating device 7, thereby increasing the amount of hot air entering to meet the heat exchange requirements. When the detected hot air temperature increases, the controller decreases the opening of the hot air flow regulating device 7, thereby reducing the amount of hot air entering. This adjustment achieves energy savings, avoids heat waste, and ensures timely fulfillment of heat exchange requirements.

[0078] Preferably, when the detected temperature of the heat-exchanged fluid is lower than a preset value, the controller increases the opening of the cold air flow regulating device 9 and decreases the opening of the hot air flow regulating device 7, thereby increasing the amount of hot air entering and decreasing the amount of cold air. When the detected hot air temperature is higher than a preset value, the controller decreases the opening of the cold air flow regulating device 9 and increases the opening of the hot air flow regulating device 7, thereby decreasing the amount of hot air entering and increasing the amount of cold air. Through these adjustments, energy-saving requirements can be achieved, heat waste can be avoided, and heat exchange requirements can be met in a timely manner.

[0079] Preferably, when the detected temperature of the heat-exchanged fluid is higher than a preset value, the controller increases the opening of the cold air flow regulating device 9, thereby increasing the amount of cold air entering to meet the heat exchange requirements. When the detected temperature of the heat-exchanged fluid is lower than the preset value, the controller decreases the opening of the cold air flow regulating device 9, thereby reducing the amount of cold air entering to meet the heat exchange requirements. This adjustment achieves energy savings, avoids heat waste, and ensures timely fulfillment of heat exchange requirements.

[0080] The flow regulating device with a split grille structure adjusts the fluid flow rate by changing the angle between the grille and the central axis of the cold air inlet pipe.

[0081] Preferably, the loop pipe includes a preheating pipe 36.

[0082] While the present invention has been disclosed above with reference to preferred embodiments, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A solar air supply system, said system comprising a heat collector, an outlet duct, a return duct and a user, air being heated in the heat collector, transported through the outlet duct to the user inlet duct and then into the user for air supply, and return air being transported through the return duct to the heat collector for heating, characterised in that, The hot air adjusting device and the mixed air adjusting device are arranged in the user inlet pipe, the hot air adjusting device is located upstream of the mixed air adjusting device, a cold air input pipe is arranged between the hot air adjusting device and the mixed air adjusting device, the hot air adjusting device and the mixed air adjusting device are multi-lattice structures, and adjacent lattice pieces are of a split adjusting structure. The mixed air adjusting device can finely adjust the lattice angle according to the incoming flow velocity distribution state, and the adjusting mode is as follows: a / A = e * (V - V p ) / V p ; where a is the variable angle of the grid vane, V is the local velocity near the grid vane, V p is the cross-sectional average velocity, angle A is the current angle of the grid vane, and e is a parameter, taking the following data: 0<A<=30°, 0.53<epsilon<0.58; 30<A<=60°, 0.46<epsilon<0.53; 60<A<90°, 0.42<epsilon<0.

46.

2. The solar air supply system of claim 1, wherein, The arrangement directions of the hot air adjusting device and the mixed air adjusting device are different, the lattice pieces of the hot air adjusting device are horizontally opened, the lattice pieces of the mixed air adjusting device are vertically opened, or the lattice pieces of the hot air adjusting device are vertically opened, and the lattice pieces of the mixed air adjusting device are horizontally opened.

3. The solar air supply system of claim 1, wherein, The cold air adjusting device is arranged on the cold air input pipe, and the cold air adjusting device is a multi-lattice structure, and adjacent lattice pieces are of a split adjusting structure.

4. The solar air supply system of claim 1, wherein, With the continuous increase of A, epsilon continuously decreases.

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