A solar heat absorber with a composite structure of glass tube bundles and porous media

Abstract

The invention discloses a glass tube bundle and porous medium composite structure solar absorber which comprises a solar absorber shell, wherein a quartz glass window is formed in one end of the solar absorber shell, and a medium outlet is formed in the other end of the solar absorber shell; the solar absorber shell and the quartz glass window are connected into a whole, and a cavity is formed between the solar absorber shell and the quartz glass window; glass tube bundles and porous media are sequentially arranged inside the cavity along the solar incident direction; a preheating channel is formed among the solar absorber shell, the glass tube bundles and the porous media; a first medium inlet is formed in one end of the preheating channel; and after preheated in the preheating channel, the media converge sunlight at the second medium inlet so as to enter the glass tube bundles. Because the glass tube bundles are small in solar absorption and small in external radiation energy, the thermal efficiency of the system is improved. Meanwhile, the incident sunlight is transmitted to the porous medium by the glass tube bundles, so that medium distribution is matched with sunlight flow density, while the porous medium is mainly capable of converting solar radiation energy into internal energy of working media; and therefore, the problem that the existing porous medium solar absorber is low in thermal efficiency and reliability is effectively solved.

Description

technical field [0001] The invention relates to the technical field of solar energy application, in particular, the invention relates to a solar heat absorber with a composite structure of a glass tube bundle and a porous medium. Background technique [0002] The solar porous heat absorber is composed of an optical window and a porous medium heat absorbing core. The concentrated solar beam passes through the optical window, enters the porous heat-absorbing core to be absorbed, and heats the porous heat-absorbing core to reach a high temperature state; The working fluid flows out from the outlet of the porous heat absorber to complete the high temperature heat conversion process of solar energy. Due to the large specific surface area, porous media can absorb and convert solar radiation energy, and can convert solar radiation energy into high-temperature internal energy of gas medium to do work and complete solar light-to-heat work conversion. prospect. [0003] On the webs...

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Problems solved by technology

[0009] Aiming at the characteristics of the heat transfer process of the porous media heat absorber, and comprehensively considering the solar energy transmission conversion and the enhanced heat exchange of the working medium, the present invention proposes a solar heat absorber with a composite structure of glass tube bundles and porous media, which effectively solves the problem of existing porous media heat absorption. Technical problems of poor thermal efficiency and reliability

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