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Comparative study of flat and cylindrically-shaped selective solar absorber for CSP application

Published online by Cambridge University Press:  06 April 2018

James G. Mallett ,
Saleh Khamlich  and
Malik Maaza
James G. Mallett*
Affiliation:
University of Stellenbosch, Engineering Department, Stellenbosch, South Africa UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk Ridge, PO Box392, Pretoria, South Africa Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure Road, Somerset West7129, PO Box722, Somerset West, Western Cape Province, South Africa
Saleh Khamlich
Affiliation:
UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk Ridge, PO Box392, Pretoria, South Africa Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure Road, Somerset West7129, PO Box722, Somerset West, Western Cape Province, South Africa
Malik Maaza
Affiliation:
UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk Ridge, PO Box392, Pretoria, South Africa Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure Road, Somerset West7129, PO Box722, Somerset West, Western Cape Province, South Africa
*
*(Email: MallettJamesG@gmail.com)
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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.

Keywords

absorptionannealingscanning electron microscopy (SEM)thin film

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Type
Articles
Information
MRS Advances , Volume 3 , Issue 38: African Materials Research Society 2017 , 2018 , pp. 2251 - 2260
Copyright
Copyright © Materials Research Society 2018 

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