Cermet film selective black absorber
First Claim
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1. A selective black absorber capable of highly absorbing solar energy and only slightly emitting infrared energy comprising:
- a composite substrate comprising a plastic layer and a low infrared emissivity film coating deposited thereon and said composite substrate being electrically nonconductive in the direction normal to the layer of said composite substrate,a cermet film deposited on the film coating of said composite substrate, said cermet film comprising metal particles having diameters much less than the average wavelength of solar energy to be absorbed to cause the particles to behave as Lorentz oscillators in the visible light spectrum and thus be good solar energy absorbers,said cermet film having a thickness and composition such that it has high solar absorptance and low infrared thermal emissivity as a coating on said substrate having low infrared emissivity.
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Abstract
A selective-black absorber capable of operation at elevated temperatures and high efficiency as a solar energy absorber is described. A cermet of MgO/Au, MgO/Pt, and Cr2 O3 /Cr having high solar energy absorptance and low infrared energy emissivity is coated on a substrate having high infrared reflectivity such as Mo coated on stainless steel; Ni coated on Cu, or steel; aluminum, or steel. Typically an absorption coefficient of about 0.93 with an emissivity of about 0.09 is obtained and operation at a temperature of 300°-400° C. is possible depending on the cermet and substrate materials.
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Citations
24 Claims
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1. A selective black absorber capable of highly absorbing solar energy and only slightly emitting infrared energy comprising:
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a composite substrate comprising a plastic layer and a low infrared emissivity film coating deposited thereon and said composite substrate being electrically nonconductive in the direction normal to the layer of said composite substrate, a cermet film deposited on the film coating of said composite substrate, said cermet film comprising metal particles having diameters much less than the average wavelength of solar energy to be absorbed to cause the particles to behave as Lorentz oscillators in the visible light spectrum and thus be good solar energy absorbers, said cermet film having a thickness and composition such that it has high solar absorptance and low infrared thermal emissivity as a coating on said substrate having low infrared emissivity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A selective black absorber capable of highly absorbing solar energy and only slightly emitting infrared energy comprising:
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a metallic substrate having low infrared emissivity, an electrically insulating layer which is transparent to infrared radiation deposited on said metallic substrate to form a metallic substrate-insulating layer composite which is electrically insulating in the direction normal to the substrate, a cermet film deposited on the electrically insulating layer, said cermet film comprising metal particles having low emissivity in the infrared spectrum and diameters much less than the average wavelength of solar energy to be absorbed to cause the particles to behave as Lorenz oscillators and to be good solar energy absorbers, said cermet film having a thickness and composition such that it has high solar absorptance and low infrared thermal emissivity. - View Dependent Claims (24)
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Specification