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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*
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
*
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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.

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Articles
Copyright
Copyright © Materials Research Society 2018 

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References

REFERENCES:

Eberhard, A.; Rosnes, O.; Shkaratan, M.; Vennemo, H.. 2011. Africa’s Power Infrastructure: Investment, Integration, Efficiency. Directions in Development; infrastructure. World Bank. © World Bank.Google Scholar
World Bank, Sustainable Energy for All databases (2017) Access to Electricity, % of Population, Sub-Saharan Africa.Google Scholar
Islam, S., Digneffe, L. (2014) Friends of Europe, International Development. Investing in Africa: The challenge of agriculture. Spring 2014.Google Scholar
FAO (2013). Food and Agriculture Organization of the United Nations: Milk and Dairy Products in Human Nutrition. Edited: Muehlhoff, E., Bennett, A., Mcmahon, D. p3Google Scholar
Randolph, T. F., Schelling, E., Grace, D., Nicholson, C. F., Leroy, J. L., Cole, D. C., Demment, M. W., Omore, A., Zinsstag, J., and Ruel, M.. 2007. Invited Review: Role of livestock in human nutrition and health for poverty reduction in developing countries123. Journal of Animal Science 85:27882800.CrossRefGoogle Scholar
Bramley, A. and Mckinnon, C.. The Microbiology of Raw Milk. Dairy Microbiology, 1990 volume 1. P 163208Google Scholar
Holsinger, Rajkowski and Stabel, 1997. Milk pasteurization and safety: A brief history and update. Revue Scientifique et Technique de l’OIE, Volume 16, Issue 2, 1997, p441451.CrossRefGoogle Scholar
SolarGIS (2017). DNI Solar Map.Google Scholar
Tian, Y., Zhao, C.Y., A review of solar collectors and thermal energy storage in solar thermal applications, In Applied Energy, Volume 104, 2013, Pages 538553.CrossRefGoogle Scholar
Public Health Service/Food and Drug Administration. Grade ‘A’ PMO: Pasteurized Milk Ordinance.Google Scholar
Bermel, Peter & Lee, Jeongwon & Joannopoulos, D., John & Celanovic, Ivan & Soljacie, Marin. (2012). Selective solar absorbers. Annual Review of Heat Transfer. 15. 231254.CrossRefGoogle Scholar
Xiao, G. 2007. A closed parabolic trough collector system. https://hal.archives-ouvertes.fr/hal-00177601/documentGoogle Scholar
Kennedy, C.E.. (2002). Review of Mid- to High-Temperature Solar Selective Absorber Materials. Tech. Rep. TP-520-31267, National Renewable Energy Laboratory. 520.. 10.2172/15000706.Google Scholar
Khamlich, S., Maaza, M., Cr/α-Cr2O3 Monodispersed Meso-spherical Particles for Mid-temperature Solar Absorber Application, In Energy Procedia, Volume 68, 2015, Pages 3136, ISSN 1876-6102,CrossRefGoogle Scholar
Khamlich, S., McCrindle, R., Nuru, Z.Y., Cingo, N., Maaza, M., Annealing effect on the structural and optical properties of Cr/α-Cr2O3 monodispersed particles based solar absorbers, In Applied Surface Science, Volume 265, 2013, Pages 745-749, ISSN 01694332CrossRefGoogle Scholar
Nuru, Z.Y., Arendse, C.J., Muller, T.F., Khamlich, S., Maaza, M., Thermal stability of electron beam evaporated AlxOy/Pt/AlxOy multilayer solar absorber coatings, In Solar Energy Materials and Solar Cells, Volume 120, Part B, 2014, Pages 473-480, ISSN 0927–0248CrossRefGoogle Scholar
Zebib, Y. Nuru, C.J. Arendse, R. Nemutudi, O. Nemraoui, M. Maaza, Pt–Al2O3 nanocoatings for high temperature concentrated solar thermal power applications, In Physica B: Condensed Matter, Volume 407, Issue 10, 2012, Pages 1634-1637, ISSN 09214526Google Scholar
Nuru, Z.Y., Arendse, C.J., Khamlich, S., Kotsedi, L., Maaza, M., A Tantalum diffusion barrier layer to improve the thermal stability of AlxOy/Pt/AlxOy multilayer solar absorber, In Solar Energy, Volume 107, 2014, Pages 8996, ISSN 0038-092XCrossRefGoogle Scholar
Edwards, D.K., Gier, J.T., Nelson, K.E., Roddick, R.D., Spectral and directional thermal radiation characteristics of selective sufaces for solar collectors, In Solar Energy, Volume 6, Issue 1, 1962.CrossRefGoogle Scholar
Khamlich, S., Manikandan, E., Ngom, B.D., Sithole, J., Nemraoui, O., Zorkani, I., Cingo, N., Maaza, M., McCrindle, R., Synthesis, characterization, and growth mechanism of a-Cr monodispersed particles 2 O 3, Journal of Physics and Chemistry of Solids, Volume 72, 2011, 714718.CrossRefGoogle Scholar