Transmission-reflection linear spotlight heat collector

Abstract

The invention discloses a transmission-reflection linear spotlight heat collector. The heat collector comprises a linear focus Fresnel lens, a vacuum heat collecting pipe, and a parabolic groove surface reflection lens; and the heat collector has a single-axis light tracking ability. The vacuum heat collecting pipe is located at the focal line position of the linear focus Fresnel lens and the parabolic groove surface reflection lens; the Fresnel lens focuses the central light of approximately parallel sunlight to the sunward wall of the vacuum heat collecting pipe; the parabolic groove surface reflection lens focuses the bilateral light of approximately parallel sunlight to the bilateral downsun walls of the vacuum heat collecting pipe; the heat conductive medium inside the vacuum heat collecting pipe absorbs the focused solar energy, so as to finish the heat up process. The solar heat collector can be applied to the field of solar energy photo-thermal, and significantly solves the difficulty that the thermal flux distribution on circumference direction of the heat collecting pipe in the conventional groove type heat collector is uneven; the heat collector is excellent in performance and low in cost.

Description

technical field [0001] The invention relates to the technical field of solar thermal power generation, in particular to a transmission-reflection linear concentrating 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] The trough solar collector is the core component of the trough thermal power generation system, and its efficiency of converting sunlight into heat will directly affect the thermal efficiency and economy of the solar thermal power genera...

AI Technical Summary

Problems solved by technology

[0006] In view of this, the main purpose of the present invention is to provide a transmissive-reflective linear concentrating heat collector, by arranging a Fresnel lens on the sun-facing wall of the vacuum heat-collecting tube, the heat flux density distribution in the circumferential direction of the heat-collecting tube is evenly distributed, thereby solving the current problem Under the working conditions of non-uniform heat flow, thermal stress leads to mechanical deformation of heat collecting tubes, and technical problems such as decline in heat collection efficiency

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