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11 September 2008 Quantifying the efficacy of solar selective absorber materials: the case of carbon nanoparticles dispersed in SiO2, ZnO, and NiO matrices
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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.
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G. Katumba, A. Forbes, L. Olumekor, and G. Makiwa "Quantifying the efficacy of solar selective absorber materials: the case of carbon nanoparticles dispersed in SiO2, ZnO, and NiO matrices", Proc. SPIE 7046, Optical Modeling and Measurements for Solar Energy Systems II, 70460B (11 September 2008); https://doi.org/10.1117/12.793705
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