Glass-cover-free tubular solar thermal collector

Abstract

A glass-cover-free tubular solar thermal collector relates to a solar thermal collector, and a problem that a glass cover of the solar thermal collector cracks due to the fact that thermal expansion degrees of a metal material and the glass cover of a tubular thermal absorber are different is solved. A light enclosing cavity is made of a metal material, a heat preservation layer is wrapped on an outer wall of the light enclosing cavity, and the tubular thermal absorber is arranged in the light enclosing cavity and made of the metal material. A light-transmitting port is arranged on the top portion of the light enclosing cavity, an optical window is arranged at the light-transmitting port, and two ends of the light enclosing cavity are connected with the tubular thermal absorber in mechanical mode through metal sealing connecting joints with a function of reducing thermal strain respectively. The axial thermal expansion difference of the light enclosing cavity and the tubular thermal absorber is offset through wave pitch changes of a corrugated metal connecting sealing joint, and the problem that the glass cover is prone to crack, and the glass cover, the tubular thermal absorber and the metal connecting sealing joint of the traditional tubular thermal absorber are hard to weld is solved.

Description

technical field [0001] The invention relates to a solar heat collector, in particular to a tubular solar heat collector without a glass cover, and belongs to the technical field of solar energy concentrating systems. Background technique [0002] Solar thermal utilization is one of the effective ways to develop renewable energy. At present, there are three main forms of solar thermal power generation technology in the world: trough type, tower type and dish type. Among them, the tower and dish solar thermal power generation technologies are still in the test and demonstration stage, while the trough solar thermal power generation technology is a mature commercial technology. The trough concentrator uses the geometrical optics characteristics of the parabola to concentrate the sunlight with low radiation heat flux density to form a high concentrated heat flux. The tube-type heat absorber placed at the focal plane of the trough concentrator absorbs the high-concentration hea...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the glass tube cover of the single-stage or multi-stage trough solar concentrating system heat collector is broken due to the different thermal expansion degrees of the metal material of the tube heat absorber and the glass cover, and then provide A tubular solar collector without a glass cover

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