Abstract
The material and absorptive properties of a commercial selective solar absorber were studied after being exposed to temperatures that could be expected during its lifespan in a solar collecting device. The samples were tested as both flat sheets, and after being rolled into the shape of a tube. Moreover, the morphological analysis of the annealed samples at 100, 200, 300, 400 and 500 °C revealed an increase in the crystallite size of the thin films with increasing annealing temperature, and larger agglomerates where observed for samples annealed at temperatures above 200 °C . The total diffuse reflectance of the annealed samples was performed and the obtained data was used to calculate their solar absorption at wavelengths ranging from 200 to 2600 nm. Interestingly, optical performance degradation was observed above 200 °C indicating that the structural changes of the thin films at higher temperature induced a reduction in the efficiency of the selective absorber coating. Additionally, no significant difference in the physical properties and rate of efficiency decline between the flat and the rolled sheets of the solar absorber coating was observed indicating its potential use as a cylindrical shaped absorber for concentrating solar power application.
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Mallett, J.G., Khamlich, S. & Maaza, M. Comparative study of flat and cylindrically-shaped selective solar absorber for CSP application. MRS Advances 3, 2251–2260 (2018). https://doi.org/10.1557/adv.2018.345
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DOI: https://doi.org/10.1557/adv.2018.345