Assessment of Daylight Intensity as a Function of the Ratio of the Window Area and Total Room Volume for Office Buildings in Jos, Nigeria
International Journal of Environmental Monitoring and Analysis
Volume 3, Issue 3, June 2015, Pages: 173-179
Received: Apr. 6, 2015;
Accepted: Apr. 16, 2015;
Published: May 13, 2015
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Ademola Olatunji Jimoh, Faculty of Environmental Sciences, Dept. of Architecture University of Jos, Jos City, Nigeria
Olabode Michael Ogunrayewa, Faculty of Environmental Sciences, Dept. of Architecture University of Jos, Jos City, Nigeria
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The subjective data for this study was obtained from questionnaires while the objective data was obtained from measurement instruments. An 80% combined votes of respondents found the level of lighting inadequate. This is in consonance with objective measurements, which show interior light level way below recommended standards for the building under research. This has led to the wasteful use of energy for lighting purposes in the day time. However, day light intensity increases as the day proceeds. Also, a linear relationship between the ratio of Operable Window Area to Total Office Volume and day light intensity was established. The lower the Operable Window Area to total Office Volume Ratio, the lower the day light intensity. Hence, by simple linear regression analysis, it concluded that the ratio of operable window area to total room volume of 0.0273 would be required for an acceptable indoor day light intensity of 400 lux in East-Facing Office Buildings with 5mm clear glass windows in Jos, Nigeria. However, all the offices studied showed an insufficient average ratio of 0.0023.
Daylight Intensity, Working Surfaces, Window Area, Office Buildings
To cite this article
Ademola Olatunji Jimoh,
Olabode Michael Ogunrayewa,
Assessment of Daylight Intensity as a Function of the Ratio of the Window Area and Total Room Volume for Office Buildings in Jos, Nigeria, International Journal of Environmental Monitoring and Analysis.
Vol. 3, No. 3,
2015, pp. 173-179.
Hedge, A., William, R., Sims W. R., and Becker, F.D. (1989) Lighting the Computerized Office. Department of Design and Environmental Analysis New York State College of Human Ecology Cornell University, Ithaca, New York http://ergo.human.cornell.edu/lighting/lilstudy/lilstudy.htm. (accessed Febuary 2015).
Brown, S.K. (2006) “High quality indoor environments for office buildings in: Client Driving Innovation: Moving Ideas into Practice. 12-14 (2006): 9-12, http://eprint.qut.edu.au/27229/1/27229.pdf (accessed February 2015).
ASHRAE/IES 90.1 ANSI/ASHRAE/IES Standard 90.1-2010 (I-P Edition). Energy Standard for Buildings Except Low-Rise Residential Buildings. American Society of Heating, Refrigeration and Air-conditioning Engineers (ASHRAE), Atlanta.
Dilaura, D.L., Houser, K.W., Mistrick, R.G. and Steffy, G.R. (2011)The Lighting Handbook: Reference and Application (IESNA Lighting Handbook). ISBN-13: 978- 0879952419.
Veitch, J.A and Newsham, G.R. (2000) “Preferred luminous conditions in open-plan offices: Research and practice recommendations,” Lighting Research and Technology, 32(4), pp. 199-212.
Newsham, G.R. Veitch, J.A. Reinhart, C.F. and Sander, D.M. (2004) Lighting Design for Open-Plan Offices. Construction Technology Update No. 62. 2004 National Research Council of Canada October 2004 ISSN 1206-1220.
Veitch, J.A. and Newsham, G.R. (2013) “Lighting quality and energy-efficiency effects on task performance, mood, health, satisfaction and comfort,” in: Establishing Industry Best Practice Criteria for Electric lighting Levels (2013). www.nzgbc.org.nz. (accessed March 2015).
Worthington, J. (2003) Reinventing the Work Place. Copyright 1997, Institute of Advance Architectural Studies. The University of York. (Digital Copy 2003) Anthony Rowe ltd, Eastbourne, London. ISBN 0 7506 2841 3.
Vimalanathan, K. and Babu, T.R. (2014). The Effect of Indoor Office Environment on the Work Performance, Health and Well-Being of Office Workers. Journal of Environmental Health Science & Engineering2014,12:113. http://www.ijehse.com/content/12/1/113.
Gibberd, J. and Motsatsi, L. (2015) Are Environmental Conditions in South African Classrooms Conducive for Learning? Department of Architecture, University of Pretoria. https://www.academia.edu/4849243/ (accessed March 2015).