Abstract
Energy consumption of lighting can be reduced by using different daylight control strategies. The rise in
environmental distresses requires the necessity of natural light control systems. Light shelf is considered as
excellent lighting control scheme that provides great lighting production and inexpensive prospect via entering
the daylight inside the space. The aims of this study shows that the daylight efficiency and visual productivity
are affected by the design parameters of light shelf such as its angle, location and height. In this research, Autodesk Ecotect 2011 is used for the daylight simulation of summer solstice and winter solstice days under overcast sky conditions on a nominated theoretical study space of an institutional building. Daylight simulation is
carried out to evaluate the illuminance requirement within the selected space and analysis is also executed on
the model with selected categories of light shelves including different positions, heights and angles. The
acquired data is then exported on Radiance software intended for complete day-light investigation. The results
of this research shows that external light shelf at a height of 7' and an angle of 20˚ is the most appropriate
choice in prevailing the glare and it also enhanced the illuminance level to11.5% in 21st June and 10.6% in 21st
December as compared to without light shelves. Furthermore, the shaded range is decreased by the rise in the
angle of Light shelf which has a tendency to increase the inside average lighting. Hence, significant
consideration should be given to the height and position of light shelves, since it has a superior effect on light
shelf performance.
Sadaf Noshin, Abrar Ahmad, Humaira Kanwal. (2020) A Comparative Study on Daylight Performance Assessment of Light Shelves Based on Inclination , Mehran University Research Journal of Engineering & Technology, Volume 39, Issue 4.
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