Secondary concentrated reflection-transmission type parabolic-trough type solar heat collector

Abstract

The invention discloses a secondary concentrated reflection-transmission type parabolic-trough type solar heat collector. The collector comprises a line-focusing Fresnel lens, a collimating Fresnel lens, an evacuated heat collector tube and a parabolic trough surface reflector and has a uniaxial ray tracing capability. Real focuses of the line-focusing Fresnel lens and virtual focuses of the collimating Fresnel lens are coincided; the evacuated heat collector tube is located at the focus line position of the parabolic trough surface reflector; parallel sunlight completes primary condensation via the line-focusing Fresnel lens and is diffused into parallel light once again via the collimating Fresnel lens; the parallel sunlight subjected to the primary condensation is reflected to the wall surface of the evacuated heat collector tube through the parabolic trough surface reflector to complete secondary condensation; focused solar energy is absorbed through heat transfer medium in the evacuated heat collector tube to complete the heating process. The solar heat collector can be applied to the solar-thermal field, and difficult problems that heat collecting efficiency of a traditional trough-type heat collector is greatly decreased in periods of winter and the like when sun irradiation is reduced, incident angle is increased are well solved and the cost is low.

Description

technical field [0001] The invention relates to the technical field of solar thermal power generation, in particular to a secondary concentrating reflection-transmission parabolic trough solar heat collector. Background technique [0002] As an inexhaustible, inexhaustible, clean and pollution-free new energy source, solar energy has attracted more and more attention from people. There are mainly three types of solar thermal power generation: trough type, tower type and dish type according to the heat collection form. Among them, the trough type solar thermal power generation technology is the most mature and has been commercialized in foreign countries. It is the recent development of solar thermal power generation technology in the world. focus direction. [0003] In summer with good irradiation conditions, for the trough collectors arranged on the north-south axis and tracked by the east-west axis, the peak heat collection efficiency can reach more than 65%, and the heat...

AI Technical Summary

Problems solved by technology

[0006] In view of this, the main purpose of the present invention is to provide a secondary concentrating transmission-reflection parabolic trough solar collector, by arranging linear Fresnel lenses and collimating Fresnel lenses to realize primary concentration of solar energy Light, and then through the parabolic trough reflector to realize the secondary concentration of solar energy, so as to solve the technical problem of the decline in the heat collection performance of the trough collector under the current working conditions of declining solar radiation

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