According to the newly released report of China's solar energy industry, the sales volume of flat-panel solar collection reached 7.017 million square meters in 2021, increase 2.2% compared with 2020 Flat plate solar collectors are increasingly favored by the market.
Flat plate solar collector is also used more and more in the engineering market. When selecting products, we should pay attention to 12 key points:
1. Pay attention to the optimal design of the heat absorbing plate of the collector, and comprehensively consider the influence of materials, thickness, pipe diameter, pipe network spacing, connection mode between pipe and plate and other factors on the thermal performance, so as to improve the fin efficiency (heat absorption efficiency) of the heat absorbing plate.
2. Improve the processing technology of heat absorbing plate, reduce the combined thermal resistance between tubes and plates or between different materials to a negligible degree, so as to increase the efficiency factor value of heat collector. This is a matter that hot water engineering manufacturers should focus on R & D and invest funds to study. Only with product innovation can they have greater market competitiveness.
3. Research and develop a selective absorption coating suitable for flat plate solar collector, which should have high solar absorption ratio, low emission and strong weather resistance, so as to minimize the radiation heat transfer loss of heat absorption plate.
4. Pay attention to the optimal design of the distance between the transparent cover plate and the heat absorbing plate of flat solar energy in the solar water heating project, ensure the tightness of the processing and assembly of the frame of the collector, and minimize the convective heat transfer loss of the air in the collector.
5. The thermal insulation material with low thermal conductivity is selected as the thermal insulation layer at the bottom and side of the collector to ensure sufficient thickness and minimize the conduction and heat exchange loss of the collector.
6. The cover glass with high solar transmittance shall be selected. When the conditions are hot, the low iron flat glass suitable for solar collector shall be specially produced in combination with the glass industry.
7. Develop antireflection coating for solar collector to improve the solar transmittance of transparent cover plate as much as possible.
8. For solar collectors used in cold areas, it is recommended to use double-layer transparent cover plate or transparent honeycomb insulation material to suppress the convection and radiation heat transfer loss between the transparent cover plate and the heat absorption plate as much as possible.
9. Improve the processing quality of the heat absorbing plate and ensure that the collector can withstand the tests of pressure resistance, airtightness, internal water and heat shock and so on.
10. Improve the material quality, processing quality and assembly quality of the collector components to ensure that the collector can withstand the tests of rain, air drying, strength, stiffness, external water thermal shock and so on.
11. Toughened glass is selected as the transparent cover plate. It is also important to ensure that the collector can withstand the test of anti hail (impact resistance) test, because there are unexpected clouds and clouds, and many areas will suffer such extreme weather in summer, which is summarized below many cases.
12. Select high-quality materials and processes for heat absorption plate, coating, transparent cover plate, thermal insulation layer, shell and other components. Ensure that the style and appearance of the collector meet the consumer's satisfaction.
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Post time: Mar-01-2022