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Solar absorbers with layers of nickel/chromium alloy and dielectric material

  • US 4,122,239 A
  • Filed: 01/12/1977
  • Issued: 10/24/1978
  • Est. Priority Date: 01/19/1976
  • Status: Expired due to Term
First Claim
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1. A solar absorber for collecting solar energy comprising, a metallic or metallized substrate having a weak hemispherical emission factor in the infra-red range, a semi-transparent metallic layer adhering to the substrate, and an outer dielectric interference layer adhering to said semi-transparent layer to form a composite structure, the metallic layer being a layer of nickel/chromium alloy consisting of 60 to 85% by weight of nickel and of 40 to 15% by weight of chromium, and the dielectric layer being a layer of a material selected from the group comprising silicon monoxide, zinc sulphide and silicon dioxide, said solar absorber composite structure having a solar absorption factor/hemispherical emission ratio greater than 10.

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