Solar collector element
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United States of America Patent
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app pub date -
Dec 20, 2001
filing date -
Dec 20, 2000
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Abandoned
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Abstract
The invention relates to a solar collector element having an absorber part and a tube for a heat transfer liquid connected thereto on a first side. The absorber part consisting of a composite material having a metallic substrate and an optically active coating on a second side of the substrate. The coating is a multilayer system having three layers. The top layer is a dielectric layer, preferably an oxide, fluoride or nitride layer of chemical composition MeO.sub.z, MeF.sub.r, MeN.sub.s, having a refractive index n<1.8. The middle layer is a chromium oxide layer of chemical composition CrO.sub.x. The bottom layer is gold, silver, copper, chromium, aluminium and/or molybdenum. The indices x, z, r and s indicate a stoichiometric or non-stoichiometric ratio in the oxides, fluorides or nitrides.
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