Solar absorber
AssigneeSchott AG
InventorsKlaus-Juergen Riffelmann, Thomas Kuckelkorn, Christina Hildenbrandt
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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.
Claims22
A solar absorber equipped with an absorber body (10), which has a side (36) oriented toward a concentrator (13) and a side (38) oriented away from the concentrator (13) and is provided with a selective absorption layer, which, below a threshold wavelength (22), absorbs the spectrum of solar radiation and above the threshold wavelength (22), suppresses the reradiating capacity of the absorber body (10),
- wherein the absorption layer (17, 18) on the side oriented toward the concentrator (13) has a threshold wavelength (22) that is greater than the threshold wavelength (22) on the side (38) oriented away from the concentrator (13).
A solar absorber, having an absorber tube (30) and a casing (32) and having a side (36) oriented toward a concentrator (13) and a side (38) oriented away from the concentrator (13),
- wherein at least one region (55) of the casing (32), on the side (38) oriented away from the concentrator (13), is provided with a coating (60) that reflects thermal radiation.
A solar absorber, having an absorber tube (30) and a casing (32) and having a side (36) oriented toward a concentrator (13) and a side (38) oriented away from the concentrator (13),
- wherein at least one element (70, 71, 72), which is composed of a material that is reflective in the infrared range, is situated between the absorber tube (30) and the casing (32), on the side (36) oriented away from the concentrator (13).
A solar absorber, having an absorber tube (30) and a casing (32) and having a side (36) oriented toward a concentrator (13) and a side (38) oriented away from the concentrator (13),
- wherein the absorber tube (30) has an absorption layer (17, 18), which, on the side (36) oriented toward the concentrator (13), has a threshold wavelength (22) that is greater than the threshold wavelength (22) on the side (38) oriented away from the concentrator and/or at least one region (50, 55) of the casing (32) on the side (38) oriented away from the concentrator (13) is provided with a metallic coating (60) and/or at least one element (70, 71, 72), which is comprised of a material that is reflective in the infrared range, is situated between the absorber tube (30) and the casing (32), on the side (36) oriented away from the concentrator (13).
Dependencies are inferred from the claim text.