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A simulation assessment of the height of light shelves to enhance daylighting quality in tropical office buildings under overcast sky conditions in Dhaka, Bangladesh
conference contribution
posted on 2010-08-13, 10:53 authored by Md. Ashikur Rahman Joarder, Zebun Nasreen Ahmed, Andrew Price, Monjur MourshedThe objective of this paper is to highlight the
effectiveness of light shelves in tropical office
buildings to enhance interior daylighting quality.
Daylight simulation was performed for custom light
shelves for a typical office floor of Dhaka City in
Bangladesh, to determine the best possible location
under overcast sky conditions. Six alternative models
of a 3m high study space were created with varying
heights of light shelves. The 3D models were first
generated in the Ecotect to study the distribution and
uniformity of daylight in the interior space with splitflux
method. These models were then exported to a
physically-based backward raytracer, Radiance
Synthetic Imaging software to generate realistic
lighting levels for validating and crosschecking the
Ecotect results. The results showed that for achieving
light levels closest to specified standards, light
shelves at a height of 2m above floor level perform
better among the seven alternatives studied including
the alternative where no light shelves are present.
Finally, the decisions were verified with DAYSIM
simulation program to ensure the compliance of the
decisions with dynamic annual climate-based
daylight performance metrics.
History
School
- Architecture, Building and Civil Engineering
Citation
JOARDER, M.A.R. ... et al, 2009. A simulation assessment of the height of light shelves to enhance daylighting quality in tropical office buildings under overcast sky conditions in Dhaka, Bangladesh. IN: Proceedings of the Eleventh International IBPSA Conference, (Building Simulation 2009), 27-30 July, Glasgow, Scotland, pp.920-927.Publisher
© IBPSAVersion
- VoR (Version of Record)
Publication date
2009Publisher version
Language
- en