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Solar absorber

A technology of solar energy absorption and absorber, which is applied in the direction of solar collectors, solar thermal energy, solar thermal power generation, etc., and can solve problems such as poor radiation

Inactive Publication Date: 2007-08-22
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem lies in the contradictory desire that the absorber, on the one hand, absorb solar radiation well, and on the other hand, emit relatively poorly the intrinsic radiation

Method used

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Embodiment Construction

[0048] FIG. 1 shows an absorber body 10 , in which there is here a longitudinally extending absorber tube 30 , the interior 11 of which is circulated by a heat transfer medium. The incident solar radiation 12 is collected or focused on the absorber body 10 by a concentrator 13 in the form of a parabolic mirror. The absorber body 10 absorbs solar radiation and converts it into heat, which is transferred to a heat transfer medium. The heat transfer medium is thereby heated.

[0049] FIG. 2 shows the distribution of the radiation density 14 over the circumference of the absorber body in polar coordinates. On the side 36 facing the concentrator 13, the radiation density is higher. On the side 38 facing away from the concentrator, the radiation density is equal to the radiation density of the incident solar radiation, which can be represented by the value "1".

[0050] FIG. 3 illustrates the spectral distribution of the radiation density of incident solar radiation by means of t...

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Abstract

The invention relates to a solar absorber comprising an absorber body (10) provided with an absorption layer (17) on the side thereof on which the radiation concentrated by a concentrator is incident, and an absorption layer (18) on the opposite side. The absorption layer on the side facing the concentrator has a higher boundary wavelength than the opposing absorption layer. In this way, in the region of higher irradiance, the limit of the radiation emission of the absorber body is shifted to longer wavelengths such that both sides of the absorber body are operated with the respectively highest possible directivity.

Description

technical field [0001] The invention relates to a solar absorber with an absorber body having a side facing the concentrator and a side facing away from the concentrator and which is provided with a selective absorption layer, the absorber body The absorbing layer absorbs the spectrum of solar radiation below a limiting wavelength and suppresses the radiative capacity of the absorber body above the limiting wavelength. The invention also relates to a solar absorber according to the preambles of claims 13 , 17 and 22 . Background technique [0002] A solar absorber is the part of a solar collector that converts solar radiation into heat. In addition to optical losses, heat losses also occur at the absorber, since they have a higher temperature than the surroundings due to the conversion of solar radiation into heat. In focused collectors such as parabolic collectors, Fresnel collectors and solar towers, the absorber is typically heated to several hundred degrees Celsius. R...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24J2/48F24J2/10F24J2/05F24J2/07F24S10/40F24S20/20F24S23/30F24S23/70F24S23/74
CPCF24J2/485F24J2/055F24J2/07Y02E10/41Y02E10/44Y10S126/907F24S80/52F24S20/20F24S10/45F24S70/225Y02E10/40
Inventor K·-J·里费尔曼T·库克尔科恩C·希尔德布兰德特
Owner SCHOTT AG
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