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Diffused reflectance measurements and Kubelka–Munk values were studied. The effects of the alumina layer and the nickel content on the optical properties of the selective absorber were discussed. In general and with respect to aluminium alloy substrate, the diffused reflectance decreased by 85.25–91.42% (±0.01%). The emissivity increased by a factor of 252.50–624.50 (±0.01). The average absorptivity...
The solar thermal performance of a nickel-pigmented aluminium oxide selective absorber was determined by using an experimental model (prototype model). The constructed models were tested outdoors during daylight under a clear sky. Different volumes of prototypes were used. The flat-plate collector used was of the glazed type. The thermodynamic characteristics of each flat-plate collector were determined...
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