A Spectrally Selective Window for Hot Climates
- 1 Department of Physics, Omdurman Ahlia University, Omdurman, Sudan
- 2 Department of Physics, Faculty of Education, University of Algadarif, Gadaref, Sudan
- 3 Department of Physics, Red Sea University, Port Sudan, Sudan
Abstract
Rigorous coupled-wave analysis has been used to design a glazing for hot climates. The designed glazing is relatively simple and it transmits most of the visible light and reflects most of the infrared radiation. It does not need any external source of energy to control its optical properties. It consists of ITO and four periodic pairs of Si/SiO 2 , deposited on a glass sheet. The optimum thicknesses of ITO, Si and SiO 2 are 0.1 μ m, 0.15 and 0.4 μ m, respectively. The glazing acts as an optically selective filter. It transmits about 80% of the visible light and reflects almost all the infrared radiation. The performance of the glazing is almost independent of the angle of incidence of solar radiation. This makes it suitable for all hours of the day. The fabrication of the glazing and the testing have been performed at the laboratories of the Faculty of Science, University of Witwatersrand, South Africa. Magnetron sputtering technique has been used for the fabrication. ITO, Si and SiO 2 have been used as sputtering targets. The experimental results are almost identical to the simulation results.
- (2012) Policies and Energy Planning Department, Ministry of Petroleum, Khartoum, Sudan.
- Rudolph, S.E., Dieckmann, J. and Brodrick, J. (2009) Technologies for Smart Windows. ASHRAE Journal, 51, 104-106.
- Hong, S. and Chen, L. (2012) Nano-Prussian Blue Analogue/PEDOT:PSS Composites for Electrochromic Windows. Solar Energy Materials & Solar Cells, 104, 64-74.
- Kim, S. and Taya, M. (2012) Electrochromic Windows Based on V 2 O 5 -TiO 2 and Poly(3,3-Dimethyl-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepine) Coatings. Solar Ener-gy Materials & Solar Cells, 107, 225-229.
- Kim, S., Kong, X. and Taya, M. (2013) Electrochromic Windows Based on Anodic Electrochromic Polymesitylenes Containing 9H-Carbazole-9-Ethanol Moieties. Solar Energy Materials & Solar Cells, 117, 183-188.
- Fernandes, M., Freitas, V.T., Pereira, S., Fortunato, E., Ferreira, R.A.S., Carlos, L.D., Rego, R. and Bermudez, V. (2014) Green Li + -and Er 3+ -Doped Poly(ε-Caprolac-tone)/Siloxane Biohybrid Electrolytes for Smart Electrochromic Windows. Solar Energy Materials & Solar Cells, 123, 203-210.
- Hee, W.J., Alghoul, M.A., Bakhtyar, B., OmKalthum, E., Shameri, M.A., Alrubaih, M.S. and Sopian, K. (2015) The Role of Window Glazing on Daylighting and Energy Saving in Buildings. Renewable and Sustainable Energy Reviews, 42, 323-343.
- Brooke, R., Fabretto, M., Vucaj, N., Zuber, K., Switalsaka, E., Reeks, L., Murfy, P. and Evans, D. (2015) Effect of Oxidant on the Performance of Conductive Polymer Films Prepared by Vacuum Vapor Phase Polymerization for Smart Window Applications. Smart Materials and Structures, 24, Article ID: 035016. https://doi.org/10.1088/0964-1726/24/3/035016
- Kim, E., Choi, I., Oh, J., Kim, Y., Lee, J., Choi, Y., Cho, J., Kim, Y. and Heo, G. (2014) Transparent Conductive ZnInSnO-Ag-ZnInSnO Multilayer Films for Polymer Dispersed Liquid-Crystal Based Smart Windows. Japanese Journal of Applied Physics, 53, Article ID: 095505. https://doi.org/10.7567/JJAP.53.095505
- Khandelwal, H., Loonen, R., Hensen, J., Debije, M. and Schenning, A. (2015) Electrically Switchable Polymer Stabilised Broadband Infrared Reflectors and Their Potential as Smart Windows for Energy Saving in Buildings. Scientific Reports, 5, Article No. 11773. https://doi.org/10.1038/srep11773
- Wang, J., Zhang, L., Yu, L., Jiao, Z., Xie, H., Lou, X.W. and Sun, X.W. (2014) Nature Communications, 5921.
- Lim, S.H.N., Isidorsson, J., Sun, L., Kwak, B.L. and Anders, A. (2013) Modeling of Optical and Energy Performance of Tungsten-Oxide-Based Electrochromic Windows Including Their Intermediate States. Solar Energy Materials & Solar Cells, 108, 129-135.