Straight-through type single-tube solar absorber with semielliptical glass cover

Abstract

The invention discloses a straight-through type single-tube solar absorber with a semielliptical glass cover. The straight-through type single-tube solar absorber comprises an absorption tube and the glass cover located below the absorption tube. The absorption tube is a straight-through type round metal tube. The upper half circumference of the absorption tube is wrapped by an annular heat insulation layer with a breaking gap in the lower portion, and the heat insulation layer coincides with the circle center of the absorption tube. The lower half circumference of the absorption tube is exposed out of the heat insulation layer. The glass cover is a hollow semielliptical cover, and the side, exposed out of the heat insulation layer from the absorption tube, of the glass cover is sleeved and buckled with the heat insulation layer. According to the absorber, the collecting degree of reflection light is increased through refraction of the semielliptical glass cover, meanwhile, the amount of light projected to the heat insulation layer can be lowered, and the photo-thermal utilization efficiency of solar energy is greatly improved.

Description

technical field [0001] The invention relates to solar light and heat absorption equipment, in particular to a straight-through single-tube solar absorber with a semi-elliptical glass cover. Background technique [0002] With the increasingly serious problems of energy consumption, population increase, and environmental damage, solar energy is an inexhaustible clean energy, and solar thermal utilization has gradually become a hot research topic. Concentrating heat collectors have a higher operating temperature and higher conversion efficiency. With the advancement of technology, the cost needs to be further reduced, and it has great potential. [0003] The absorber is a very important part of the concentrating heat collector. Most of the glass covers of the existing cavity-type absorbers are flat plates, and the light can only be projected on the designed absorption surface after passing through the flat glass cover. When refracting twice, the light shifts outward for a cert...

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Problems solved by technology

[0003] The absorber is a very important part of the concentrating heat collector. Most of the glass covers of the existing cavity-type absorbers are flat plates, and the light can only be projected on the designed absorption surface after passing through the flat glass cover. After two times of refraction, the light is translated outward for a certain distance, so that the light received on the absorbing surface is reduced. In addition, a large part of the light is lost due to being projected on the insulation cotton, which reduces the optical efficiency.

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