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Effect of Orientation of the Wall Window on Energy Saving under Clear Sky Conditions

Authors: Madhu Sudan, G. N. Tiwari


In this paper, an attempt has been made to analyze the effect of wall window orientation on Daylight Illuminance Ratio (DIR) and energy saving in a building known as “SODHA BERS COMPLEX (SBC)” at Varanasi, UP, India. The building has been designed incorporating all passive concepts for thermal comfort as well daylighting concepts to maximize the use of natural daylighting for the occupants in the day to day activities. The annual average DIR and the energy saving has been estimated by using the DIR model for wall window with different orientations under clear sky condition. It has been found that for south oriented window the energy saving per square meter is more compared to the other orientations due to the higher level of solar insolation for the south window in northern hemisphere whereas energy saving potential is minimum for north oriented wall window. The energy saving potential was 26%, 81% and 51% higher for east, south and west oriented window in comparison to north oriented window. The average annual DIR has same trends of variation as the annual energy saving and it is maximum for south oriented window and minimum for north oriented window.

Keywords: Clear sky, Daylight Illuminance Ratio, Energy saving, Wall window.

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[1] S. Treado, G. Gillette, Kusuda T. Daylighting with windows, skylights, and clerestories. Energy Build; 6(1984) 319-30.
[2] D.H.W. Li, A review of daylight illuminance determinations and energy implications, Appl Energy 87 (2010) 2109-18.
[3] T.T. Chow, C. Li, Z. Lin, Innovative solar window for cooling-demand climate, Solar Energy Materials & Solar Cells 94 (2010) 212–220.
[4] CIE, International lighting vocabulary. Commission Internationale de l'Eclairage 2011, CIE S 017:2011.
[5] I. Acosta, C. Munoz, M. A. Campano, J. Navarro, Analysis of daylight factors and energy saving allowed by windows under overcast sky conditions. Renewable Energy 77 (2015) 194-207.
[6] I. Acosta, J. Navarro, J. J. Sendra, Lighting design in courtyards: Predictive method of daylight factors under overcast sky conditions, Renewable Energy 71 (2014) 243-254.
[7] Sudan, M., Tiwari, G.N., Al-Helal, I.M., 2015a. Dynamic analysis of daylight metrics and energy saving for rooftop window integrated flat roof structure of building. Solar Energy 122 (0), 834–846.
[8] Sudan, M., Tiwari, G.N., Al-Helal, I.M., 2015b. A daylight factor model under clear sky conditions for building: An experimental validation. Solar Energy 115 (0), 379–389.