MULTI-LAYER SELECTIVE COATING FOR SOLAR COLLECTOR Russian patent published in 1995 - IPC

FIELD: for applying on outer surface of absorbing panel of solar collector converting electromagnetic solar radiation to heat. SUBSTANCE: coating consists of two carbon-containing thin layers obtained through deposition from glow discharge in pairs of organic or hetero-organic compounds on metal or metallized surface. Thickness of first layer deposited on surface of collector panel is equal to λ_o/2n₁. Integral transmission factor of first layer does not exceed 0.2 and thickness of second layer is equal to λ_o/4n₂. Refractive factor of second layer shall be equal to , where λ is length of wave corresponding to maximum spectrum of solar radiation; n₁ is refractive factor of first layer and n₀ is refractive factor of surrounding medium; integral transmission factor of coating shall not exceed 0.15. EFFECT: enhanced efficiency. 1 dwg