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2020 Vol.11, Issue 1

General Article

Evaluating the effects of light-shelves to daylight distribution at south facing window using physical scaled-model method
Ali A. S. Bahdad1*
,
S. F. Syed Fadzil2
,
N. Taib3
1Ph.D. Candidate, School of Housing, Building and Planning, Universiti Sains Malaysia (USM), Penang, Malaysia
2Associate Professor, School of Housing, Building and Planning, Universiti Sains Malaysia (USM), Penang, Malaysia
3Assistant Professor, School of Housing, Building and Planning, Universiti Sains Malaysia (USM), Penang, Malaysia
* Corresponding Author
31 March 2020. pp. 2-15
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Abstract

The aim of this study is to present a critical examination under actual sky whether light shelves could change the daylight performance at back areas of space. Two parameters of light shelf design have been examined - location (L) and Position (P) which have been placed on the south facing window. A scaled-model experiment has been applied through a typical room model to deter-mine the illumination distribution levels achieved by light shelves under real sky conditions. Scaled model results were validated against computer simulation using radiance calculation, it found to be in good agreement, and the results indicated significant Pearson correlations at the 0.01 to 0.04 level. The maximum percentage of Daylight Ratio (DR) differences was 1.8% (≤10%). The results indicated that, there is no common Light Shelves (LSs) solution under tropics sky, due to the dynamic tropical sky. The optimal cases were found in different times at location L1 and L2 at P1 give the best illuminance levels. The best improvement in daylighting at deep office area (SP3) were 4.2% and 15.5% at 9:00 h on Jan and Feb, 4.7%, 0.6% and 3.6% at 12:00 h, and by 27.2%, 6.8 and 20.3% at 15:00 h on Jan, Feb and March respectively.

Keywords
daylighting
side-lit
illuminance level
light-shelves
scaled-model
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Information
  • Publisher :Sustainable Building Research Center (ERC) Innovative Durable Building and Infrastructure Research Center
  • Publisher(Ko) :건설구조물 내구성혁신 연구센터
  • Journal Title :International Journal of Sustainable Building Technology and Urban Development
  • Volume : 11
  • No :1
  • Pages :2-15
  • Received Date : 2019-08-20
  • Accepted Date : 2020-02-04
  • DOI :https://doi.org/10.22712/susb.20200002
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