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Proceedings Paper

Quantifying the efficacy of solar selective absorber materials: the case of carbon nanoparticles dispersed in SiO2, ZnO, and NiO matrices
Author(s): G. Katumba; A. Forbes; L. Olumekor; G. Makiwa
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Paper Abstract

Selective solar absorber coatings of carbon dispersed in SiO2, ZnO and NiO matrices on aluminium substrates have been fabricated by a sol-gel technique. Spectrophotometry was used to measure the near-normal reflectance of the composite coatings. Calculations of absorbed and emitted power, power retention, solar absorptance and thermal emittance were performed from the reflectance curves. The root-mean-square (rms) deviations of the reflectance curves from the ideal case were computed to determine the sample with the best performance characteristics. The thermal emittances of the samples were 30% for the SiO2, 15% for the ZnO and 10% for the NiO matrix materials. The solar absorptances were 90%, 89% and 93% for SiO2, ZnO and NiO samples, respectively. Based on the results, NiO matrix samples had the best solar selective behaviour, followed by ZnO and last were the SiO2 based samples.

Paper Details

Date Published: 11 September 2008
PDF: 8 pages
Proc. SPIE 7046, Optical Modeling and Measurements for Solar Energy Systems II, 70460B (11 September 2008); doi: 10.1117/12.793705
Show Author Affiliations
G. Katumba, Council for Scientific and Industrial Research (South Africa)
A. Forbes, Council for Scientific and Industrial Research (South Africa)
Univ. of KwaZulu-Natal (South Africa)
L. Olumekor, Univ. of Zimbabwe (Zimbabwe)
G. Makiwa, Univ. of Zimbabwe (Zimbabwe)

Published in SPIE Proceedings Vol. 7046:
Optical Modeling and Measurements for Solar Energy Systems II
Benjamin K. Tsai, Editor(s)

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