Abstract
The possibility to use stainless steel solar mirrors for increased energy collection in thermal energy systems was studied. Various grades of austenitic, ferritic and one martensitic steel were considered. The bulk reflectance was measured and the austenitic grades were selected for further analysis. The integrated solar reflectance, 0.67, was considered too low in comparison with alternative materials. The optical constants were used to calculate the solar reflectance at oblique incidence and with dielectric overlayers. Only with a double overlayer of the high-low index type an increase in R sol to 0.72 is noted. It is concluded that stainless steel will not be competitive as material for solar mirrors without such coatings. Careful consideration must also be given to long term stability properties.
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