Cylindrical solar air collector
By designing a cylindrical solar air collector, the problems of complex structure, high cost, and large pressure loss in existing technologies have been solved, achieving low-cost, high-efficiency solar energy utilization and low-energy heat transfer.
Patent Information
- Application Number
- CN202310832287.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-07
- Publication Date
- 2025-01-07
AI Technical Summary
Existing flat-plate and evacuated tube solar air collectors are complex in structure, expensive in cost and maintenance, and have large pressure loss when transferring heat through large flow of air, requiring high-energy-consuming fans.
The solar air collector with a cylindrical structure includes a transparent shell, a coaxial cylindrical heat absorber, an insulated air cavity, and a large-diameter heat transfer air channel. Combined with a metal support ring and a retractable metal hoop, it achieves efficient heat transfer and low pressure loss.
It reduces initial investment costs, improves solar energy utilization, reduces maintenance costs, and lowers wind turbine energy consumption and noise at high wind speeds.
Smart Images
Figure CN119268141A_ABST
Abstract
Description
[0001] The invention relates to the technical field of solar thermal collectors, in particular to a cylindrical solar air thermal collector. Background Art
[0002] Flat plate solar collectors and vacuum tube solar collectors with liquid heat transfer medium are the main types of solar thermal market. The heat transfer medium of liquid collectors is overheated and vaporized due to sun exposure, and the heat medium pressure rises sharply and is prone to leakage. In addition, in winter, when the temperature is below zero, the heat medium in the collector needs to use antifreeze with a freezing point lower than the ambient temperature, which increases the initial installation investment of the system.
[0003] Solar air collectors heat up faster than solar liquid collectors because the heat capacity of air is much lower and they can reach useful temperatures even at low irradiance levels.
[0004] Due to the characteristics of air, there is no problem with the system safety when using air as a heat transfer medium. Air will not freeze or boil, so there is no need to take antifreeze measures or preventive measures against simmering. At present, the main structures of solar air collectors are still flat plate and vacuum tube. Flat plate collectors are composed of frames, transparent covers, heat absorbing plate cores, air flow channels, insulation layers and back plates. They have complex structures, use a lot of materials, are heavy in weight and have high costs. Although flat plate solar collectors have a large area, due to the sun angle, the effective power time is only 4-6 hours a day. Vacuum tube solar collectors are easy to break, the sealing structure is fragile, there are many problems of leakage and freezing, large-area collectors have poor stability, are not light in weight, and have high maintenance costs. The air flow channels of the above two structures of collectors are small, and the pressure loss is large when using large-flow air for heat transfer, and they need to be equipped with expensive and energy-intensive high-pressure fans.
[0005] Therefore, it is of great significance to develop a lightweight structure, large flow channel and efficient solar air collector to reduce the initial investment cost, improve the utilization rate of solar energy, and reduce maintenance cost and manpower investment. Summary of the invention
[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a cylindrical solar air collector.
[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a cylindrical solar air collector, including a cylindrical transparent shell, a coaxial cylindrical heat absorber, an insulating air cavity between the cylindrical transparent shell and the coaxial cylindrical heat absorber, supporting sealing rings at both ends of the insulating air cavity, and a large-diameter heat transfer air flow channel inside the cylindrical heat absorber.
[0008] As a further description of the above technical solution: The transparent shell is made of highly transparent and weather-resistant material.
[0009] As a further description of the above technical solution: The transparent shell is a transparent body having one or more layers.
[0010] As a further description of the above technical solution: The cylindrical heat absorber is a metal or non-metal material with a solar spectrum absorbing coating on the outer surface.
[0011] As a further description of the above technical solution: When the transparent shell is a multi-layer transparent body, there is a heat-insulating air cavity with a certain distance between the layers of the multi-layer transparent body. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 A front cross-sectional view of a cylindrical solar air collector proposed by the present invention Figure 2 for Figure 1 Sectional view at B Figure 3 for Figure 1 Sectional view at A Figure 4 A cross-sectional view of a double-layer transparent body of a cylindrical solar air collector proposed by the present invention Figure 5 for Figure 4 Sectional view at B Figure 6 for Figure 4 Sectional view at A Legend: 1. Cylindrical transparent shell; 2. Cylindrical heat absorber; 3. Heat-insulating air cavity; 4. Support sealing ring; 5. Heat transfer air flow channel; 6. Heat insulation air cavity Implementation
[0013] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0014] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "inside" and "outside" are based on the directions and positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the elements and devices referred to must have a specific direction, and therefore cannot be used as a limitation on the present invention; the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the meanings of the above terms in the present invention can be understood according to specific circumstances.
[0015] Reference Figure 1-3 The present invention provides embodiment 1: a cylindrical solar air collector, comprising a cylindrical transparent shell 1 with an atmospheric breathing hole, which is formed by rolling and overlapping a highly transparent and weather-resistant fluorine-containing sheet, and the cylindrical diameter is 400mm; the cylindrical heat absorber 2 is formed by rolling and overlapping a blue film selective heat-absorbing aluminum strip, and the diameter is 370mm; the thickness of the heat-insulating air cavity 3 is 15mm, the support sealing ring 4 is a heat-resistant EPDM foam strip, and the large-diameter heat transfer air flow channel 5 inside the cylindrical heat absorber 2 has a diameter of 369.5mm. In order to improve the overall strength of the collector, metal support rings are placed at both ends of the inner side of the cylindrical heat absorber 2, and tightenable metal hoops are placed at both ends of the cylindrical transparent shell 1, and a support frame is welded at the bottom.
[0016] Working principle: Solar radiation is converted into heat energy by the cylindrical heat absorber 2 with a heat-absorbing coating through the cylindrical transparent shell 1 and the heat-insulating air cavity 3, and then transferred to the heat transfer air flow channel 5 inside the heat absorber to form hot air. Multiple cylindrical collectors are connected in series and parallel to form a collector array, and the fan connected to the array transports the hot air to the load. The large-diameter heat transfer air flow channel 5 achieves low pressure loss at high wind speeds, low fan energy consumption, and low noise. When the cylindrical collector is placed in the north and south, it can accurately track the east-west movement of the sun, and the effective working time is extended.
[0017] Reference Figure 4-6The present invention provides embodiment 2: a cylindrical solar air collector, comprising two layers of cylindrical transparent shells 1 with atmospheric breathing holes, the outer layer is formed by rolling and overlapping high-transparent and highly weather-resistant fluorine-containing sheets, and the cylinder diameter is 430mm, and the inner layer is formed by rolling and overlapping high-transparent PET sheets, and the cylinder diameter is 400mm; the cylindrical heat absorber 2 is formed by rolling and overlapping blue film selective heat absorption aluminum strips, and the diameter is 370mm; the thickness of the heat insulation air cavity 3 and the heat insulation air cavity 6 are both 15mm, and the support sealing ring adopts heat-resistant EPDM foam strips, and the inner side of the cylindrical heat absorber 2 has a large-diameter heat transfer air flow channel 5 with a diameter of 369.5mm. In order to improve the overall strength of the collector, metal support rings are placed at both ends of the inner side of the cylindrical heat absorber 2. Tightening metal hoops are placed at both ends of the cylindrical transparent shell 1, and a support frame is welded at the bottom.
[0018] Working principle: Solar radiation passes through two layers of transparent outer shell 1 and heat-insulating air cavity 3 and heat-insulating air cavity 6 and is converted into heat energy by cylindrical heat absorber 2 with heat-absorbing coating and conducted to heat transfer air flow channel 5 inside the heat absorber to form hot air. The heat insulation performance of the two layers of heat-insulating air cavity is improved, making the temperature of the hot air higher. Multi-section cylindrical collectors are connected in series and parallel to form a collector array, and the fan connected to the array transports the hot air to the load. The large-diameter heat transfer air flow channel 5 achieves less pressure loss at high wind speed, low fan energy consumption and low noise. When the cylindrical collector is placed in the north and south, it can achieve accurate tracking of the east-west movement of the sun, and the effective working time is extended.
[0019] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A cylindrical solar air collector, characterized in that: It comprises a cylindrical transparent shell (1), a coaxial cylindrical heat absorber (2), a heat-insulating air cavity (3) between the cylindrical transparent shell (1) and the coaxial cylindrical heat absorber (2), supporting sealing rings (4) at both ends of the heat-insulating air cavity (3), and a large-diameter heat transfer air flow channel (5) inside the cylindrical heat absorber (2).
2. A cylindrical solar air collector according to claim 1, characterized in that: The transparent outer shell (1) is made of a highly transparent and weather-resistant material.
3. A cylindrical solar air collector according to claim 1, characterized in that: The transparent outer shell (1) is a single or multiple transparent body.
4. A cylindrical solar air collector according to claim 1, characterized in that: The cylindrical heat absorber (2) is a metal or non-metal material with a solar spectrum absorbing coating on the outer surface.
5. The cylindrical solar air collector according to claim 3, characterized in that: When the transparent outer shell (1) is a multi-layer transparent body, there is a heat-insulating air cavity (6) with a certain distance between the layers of the multi-layer transparent body.