Optical Selectivity Of Oxidized Stainless Steel

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Abstract
The possibility to use oxidized stainless steel as the absorbing surface in solar thermal collectors is evaluated. In this evaluation the influence of the Fe203, Cr203 and a mixed oxide obtained in chemical oxidation as well as the steel base, are studied separately. Conventional optical theory is used for the calculation of the resulting tandem reflectance which aiveg good agreement with related experimental curves. We can understand the high selectivity for the chemical oxide as the combined effect of the moderate reflectance of the ferritic stainless steel, a n-value as small as 1.4 and a sufficiently strong tail in k into the NIR-region for the oxide-layer.

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