Line focusing solar energy collecting device of secondary convergent surface reinforced Fresnel reflecting mirror

Abstract

The invention relates to a line focusing solar energy collecting device of a secondary convergent surface reinforced Fresnel reflecting mirror. The line focusing solar energy collecting device comprises a primary optical condenser, a heat collecting pipe, a support and a secondary optical condenser. The primary optical condenser is a Fresnel reflecting mirror which has a focusing line. The heat collecting pipe is located in the position of the focusing line of the Fresnel reflecting mirror. The secondary optical condenser is a paraboloid reflecting mirror or a Fresnel reflecting mirror. The heat collecting pipe is located between the secondary optical condenser and the primary optical condenser and located on the focusing line of the secondary optical condenser. The secondary optical condenser is supported by the support. According to the line focusing solar energy collecting device provided by the invention, the secondary optical condenser is additionally arranged, the heat collector is located between the secondary optical condenser and the primary optical condenser and located on the focusing line of the secondary optical condenser, sunlight penetrating through the heat collector can be reflected to the primary optical condenser again and then is gathered to the heat collector again, the light loss amount is small, and the heat collecting efficiency is high.

Description

technical field [0001] The invention relates to a secondary light-gathering surface enhanced Fresnel reflector line-focusing solar energy collection device, in particular to a solar energy collection device with high light-to-heat conversion efficiency. Background technique [0002] The conversion of solar energy into heat is mainly divided into direct absorption and indirect absorption. The direct absorption type uses the heat-carrying medium to directly absorb solar radiation, and the temperature of the medium increases to realize photothermal conversion; while the indirect absorption type uses the light-absorbing coating to absorb solar radiation, and the heat is transferred to the heat-carrying medium after the coating temperature rises, thereby Increase the temperature of the medium to realize light-to-heat conversion. Both have usage and research cases. Compared with the indirect absorption technology route, the direct absorption solar photothermal conversion does no...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in order to solve the problems of high unit cost and low heat collection efficiency of existing medium-temperature solar collectors, the present invention provides a secondary concentrating surface enhanced Fresnel reflector line focusing The solar energy collection device adds a secondary concentrator on the basis of the prior art, the secondary concentrator is a parabolic reflector or a Fresnel reflector, and the heat collecting tube is located between the secondary concentrator and the primary concentrator and on the focal line of the secondary concentrator, it can reflect the sunlight passing through the heat collecting tube to the primary concentrator again, and gather it again to the heat collecting tube, with less light loss and high heat collection efficiency

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