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Solar collector

  • US 4,339,484 A
  • Filed: 03/03/1980
  • Issued: 07/13/1982
  • Est. Priority Date: 05/17/1977
  • Status: Expired due to Term
First Claim
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1. A solar energy collector element comprising a first glass tube into which a fluid to be heated can be directed, a second glass tube which has an internal diameter which is greater than the external diameter of the first tube and which is located about the first tube, an end-sealed evacuated space defined by the external and internal surfaces respectively of the first and second tubes, and a solar selective surface coating on the external surface of the first tube;

  • the solar selective surface coating comprising a substrate and a composite metal film, the substrate having a thickness of at least 0.05×

    10-6 m. and being composed of a metal which has a relatively low infra-red emittance, and the composite metal film comprising a metal-carbide which has a thickness between 0.04×

    10-6 m. and 0.20×

    10-6 m. and which is deposited on the substrate by a reactive sputtering process.

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