Photo-thermal Conversion Efficiency of Textured and Untextured Aluminum Substrate Coated with Titanium Dioxide (TiO2)-bound CuFeMnO4 Absorber
American Journal of Modern Energy
Volume 6, Issue 1, February 2020, Pages: 9-15
Received: Aug. 28, 2019;
Accepted: Sep. 18, 2019;
Published: Jan. 10, 2020
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Charles Opiyo Ayieko, Department of Physics, University of Nairobi, Nairobi, Kenya
Robinson Juma Musembi, Department of Physics, University of Nairobi, Nairobi, Kenya
Benard Odhiambo Aduda, Department of Physics, University of Nairobi, Nairobi, Kenya
Alex Ogacho, Department of Physics, University of Nairobi, Nairobi, Kenya
Pushpendra Jain, Department of Physics, University of Botswana, Gaborone, Botswana
The possibility of obtaining thermal energy from the sun for household bathing and washing has resulted to growth in market for solar thermal applications with new types of solar absorbers currently being investigated either to compliment or to replace existing ones. This study focuses on CuFeMnO4 absorber paint by addressing aspects which have little attention regarding improvement of optical absorption for higher efficiency such as texturing the metal substrates on which to coat CuFeMnO4 absorber paint. In this study, texturing was done controllably in order to match the incoming solar radiation wavelength and the surface topography and morphology. Textured and untextured aluminum sheets coated with titanium dioxide (TiO2)-bound CuFeMnO4 absorber paint were used to fabricate prototype flat plate solar thermal collectors. Titanium dioxide (TiO2) was chosen here as binder to a spectrally selective CuFeMnO4 absorber paint. The TiO2-bound CuFeMnO4 absorber paint was applied by a simple, cheap and up-scalable dip coating method over the aluminum sheets. The aluminum sheets were electro-chemically textured to enhance optical absorption and photo-thermal conversion efficiency for both the textured and untextured prototypes were compared. The efficiency characterization of the prototype collectors was done by measuring the global solar irradiance, fluid inlet, fluid outlet and ambient temperature. Both instantaneous and steady-state efficiencies were determined mathematically, and it was found that the prototype collector whose absorber plates were textured recorded higher instantaneous and steady-state efficiencies compared to the collector fabricated from untextured aluminum plates.
Charles Opiyo Ayieko,
Robinson Juma Musembi,
Benard Odhiambo Aduda,
Photo-thermal Conversion Efficiency of Textured and Untextured Aluminum Substrate Coated with Titanium Dioxide (TiO2)-bound CuFeMnO4 Absorber, American Journal of Modern Energy.
Vol. 6, No. 1,
2020, pp. 9-15.
Hankins, M. (1995). Small Solar Electric Systems for Africa. Motif Creative Arts, Ltd, Kenya. 61-65.
Bermel, P., M. Ghebrebrhan, W. Chan, Y. X. Yeng, M. Araghchini, R. Hamam, C. H. Marton, K. F. Jensen, M. Soljacic, J. D. Joannopoulos, S. G. Johnson, and I. Celanovic (2010). Design and global optimization of high-efficiency thermo-photovoltaic systems, Opt. Express, 18, 314–334.
Carley, S. (2009). Distributed generation: an empirical analysis of primary motivators. Energy Policy, 37, 1648-1659.
El Bassam, N. (2017). Technologies and Options of Solar Energy Applications in the Middle East. In Water, Energy & Food Sustainability in the Middle East (pp. 193-221). Springer International Publishing.
Perednis, D., & Gauckler, L. J. (2005). Thin film deposition using spray pyrolysis. Journal of electroceramics, 14 (2), 103-111.
Tulchinsky, D., Uvarov, V., Popov, I., Mandler, D., & Magdassi, S. (2014). A novel non-selective coating material for solar thermal potential application formed by reaction between sol–gel titania and copper manganese spinel. Solar Energy Materials and Solar Cells, 120, 23-29.
Ayieko, C. O., R. J. Musembi, S. M. Waita, B. O. Aduda, P. K. Jain (2012). Structural and Optical Characterization of Nitrogen-doped TiO2 Thin Films Deposited by Spray Pyrolysis on Fluorine Doped Tin Oxide (FTO) Coated Glass Slides. International Journal of Energy Engineering, 2 (3), 67-72.
Wäckelgård, E., Mattsson, A., Bartali, R., Gerosa, R., Gottardi, G., Gustavsson, F.,... & Rivolta, B. (2015). Development of W–SiO2 and Nb–TiO2 solar absorber coatings for combined heat and power systems at intermediate operation temperatures. Solar Energy Materials and Solar Cells, 133, 180-193.
Cuomo, J. J., J. F. Ziegler, J. M. Woodall (1975). A new concept for solar energy thermal conversion, Appl. Phys. Letters, 26 (10), 557-560.
Min H. L., N. Lim, D. J. Ruebusch, A. Jamshidi, R. Kapadia, R. Lee, T. J. Seok, K. Takei, K. Young Cho, Z. Fan, H. Jang, M. Wu, G. Cho, A. Javey (2011). Roll-to-Roll Anodization and Etching of Aluminum Foils for High-Throughput Surface Nanotexturing, Nano Lett., 11, 3425–3430.
Zeng, L., Yi, Y., Hong, C., Liu, J., Feng, N., Duan, X., B. A. (2006). Efficiency enhancement in Si solar cells by textured photonic crystal back reflector. Applied Physics Letters, 89 (11), 11111.
Nahar, N. M. (2017). Selective coatings on flat-plate solar collectors. International Energy Journal, 3 (1).
Duffie, J. A. and Beckman, W. A. (2006). Solar Engineering of Thermal Processes, third ed. Wiley, USA, 78-84.
Kalogirou, S., (2004). Solar thermal collectors and applications, Prog. Energy Combust. Sci., 30 (3), 231–295.
De Vos, A. (1985). Efficiency of some heat engines at maximum–power conditions. American Journal of Physics, 53 (6), 570-573.