Solar heat absorber with novel optical window

Abstract

The invention discloses a solar heat absorber with a novel optical window. The solar heat absorber comprises a fixed wall, wherein one end of the fixed wall is opened, and the optical window is formed at the opening; a space between the fixed wall and the optical window is formed into a heat absorption cavity; a porous heat absorption core is arranged in the heat absorption cavity; an air working medium inlet is formed in the bottom end of the fixed wall; an air working medium outlet is formed in the top end of the fixed wall; the optical window comprises a circular-table-shaped outer wall with an opened top and an opened bottom; a semi-semielliptical top integrally extends from the upper end of the circular-table-shaped outer wall. The invention discloses a solar optical window with a circular-table and semielliptical combined structure. The optical window is a convex structure for a high-pressure working medium, only bears a pressure action instead of a tension under the extrusion action of the high-pressure working medium, and has excellent compressive property; meanwhile, the optical window is a concave cavity structure for an incident sunshine beam, a sunshine beam reflected by an interface is capable of entering a concave cavity for many times, thus the transmittance of the sunshine beam is improved, and the total interface reflection loss is low.

Description

Technical field [0001] The present invention relates to the technical field of solar energy application. Specifically, the present invention relates to a solar heat absorber with a novel optical window. Background technique [0002] The optical window is an important part of the solar volumetric heat sink. The concentrated solar beam passes through the optical window and enters the porous heat-absorbing core to be absorbed, heating the porous heat-absorbing core to a high temperature state; on the other hand, high-pressure working fluid (such as air) It flows through the high-temperature porous heat-absorbing core and is heated to increase the temperature. The high-temperature and high-pressure working fluid flows out from the outlet of the porous heat sink to complete the solar high-temperature heat conversion process. That is to say, the optical window not only has to work under solar radiation, but also has to withstand the squeezing action of the high-pressure working medium....

AI Technical Summary

Problems solved by technology

[0022] The current solar quartz optical window design is mainly based on a planar structure or a single curved surface. This quartz optical window structure not only has a large interface reflection loss, but also has poor pressure resistance.

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