Cavity type solar energy absorber

Abstract

A cavity type solar energy absorber comprises a square casing with a front opening and a grooved type cavity structure embedded in the casing, the gap between the cavity structure and the sides is a heat-insulation layer. The cavity structure is in triangle shape, enclosed by two absorption ducts and a glass covering plate; the two absorption ducts are connected up to form the two walls of the cavity structure which are connected with the two side walls of the casing; and the glass covering plate is disposed in the front opening. The triangle cavity structure is utilized to absorb the sun incident light and secondary reflection light sufficiently, and to increase optics efficiency greatly; the absorber can be produced only by traditional material and technology, has the advantages of simple processing and low price.

Description

technical field [0001] The invention relates to equipment in the technical field of solar energy, in particular to a cavity type solar absorber. Background technique [0002] Cavity absorber is the part responsible for absorbing solar radiation and converting it into heat energy in the concentrated solar collector. Due to the black body effect of the cavity, it can fully absorb the focused sunlight. Its advantages are: the focused radiant heat flow is almost evenly distributed on the inner wall of the cavity, compared with the vacuum tube absorber, it avoids the problems of air leakage caused by the difference in thermal expansion coefficient between the glass tube and the metal tube, and the process is simple and the cost is low. [0003] Through the retrieval of prior art documents, it is found that: Qiao Li et al. published in "Acta Solaris Sinica", 1997,: 36-38, 45. The title is: Numerical Analysis of Thermal Performance of Tube Cluster Structure Cavity Absorber, and de...

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Problems solved by technology

[0003] Through the retrieval of prior art documents, it is found that: Qiao Li et al. published in "Acta Solaris Sinica", 1997,: 36-38, 45. The title is: Numerical Analysis of Thermal Performance of Tube Cluster Structure Cavity Absorber, and designed a circular The thermal efficiency of a solar collector combined with an arc-shaped cavity absorber and a trough-shaped parabolic mirror was measured. The light concentration ratio is 40. The absorber cavity is embedded with pipes, and the opening width is 10cm. The processing cost of this system is relatively low. However, it has shortcomings in making full use of secondary light, and the opening width of the arc-shaped cavity absorber must be small, otherwise the heat loss will be large

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