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Buildings 2016, 6(3), 26; doi:10.3390/buildings6030026

Investigating the Influence of Light Shelf Geometry Parameters on Daylight Performance and Visual Comfort, a Case Study of Educational Space in Tehran, Iran

1
Department of Engineering, Science and Research Branch Tehran (Alborz), Islamic Azad University, Karaj 3148635731, Iran
2
Faculty of Fine Arts, School of Architecture, University of Tehran, Tehran 14395-515, Iran
*
Author to whom correspondence should be addressed.
Academic Editor: Ravi Srinivasan
Received: 6 May 2016 / Revised: 4 July 2016 / Accepted: 6 July 2016 / Published: 13 July 2016
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Abstract

Daylight can be considered as one of the most important principles of sustainable architecture. It is unfortunate that this is neglected by designers in Tehran, a city that benefits from a significant amount of daylight and many clear sunny days during the year. Using a daylight controller system increases space natural light quality and decreases building lighting consumption by 60%. It also affects building thermal behavior, because most of them operate as shading. The light shelf is one of the passive systems for controlling daylight, mostly used with shading and installed in the upper half of the windows above eye level. The influence of light shelf parameters, such as its dimensions, shelf rotation angle and orientation on daylight efficiency and visual comfort in educational spaces is investigated in this article. Daylight simulation software and annual analysis based on climate information during space occupation hours were used. The results show that light shelf dimensions, as well as different orientations, especially in southern part, are influential in the distribution of natural light and visual comfort. At the southern orientation, increased light shelf dimensions result in an increase of the area of the work plane with suitable daylight levels by 2%–40% and a significant decrease in disturbing and intolerable glare hours. View Full-Text
Keywords: daylight; visual comfort; educational space; light shelf; daylight simulation daylight; visual comfort; educational space; light shelf; daylight simulation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Moazzeni, M.H.; Ghiabaklou, Z. Investigating the Influence of Light Shelf Geometry Parameters on Daylight Performance and Visual Comfort, a Case Study of Educational Space in Tehran, Iran. Buildings 2016, 6, 26.

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