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Interactions between louvers and ceiling geometry for maximum daylighting performance

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  • Freewan, Ahmed A.
  • Shao, Li
  • Riffat, Saffa

Abstract

The impact of ceiling geometries on the performance of louvers was investigated using physical model experiments and Radiance simulations. Two performance indicators, the illuminance level and its distribution uniformity, were used to assess daylighting performance in a room located in a subtropical climate region. It was found that the performance of the louvers can be improved by changing the ceiling geometry. The illuminance level increased in the rear of the room, and decreased in the front—near the window—compared to rooms having horizontal ceilings. Radiance results were found to be in good agreement with physical model data obtained under a clear sky and high solar radiation. Louvers' daylighting performance was reduced by tilting the louvers downward. The best ceiling shape was found to be one that is chamfered in the front and rear of the room.

Suggested Citation

  • Freewan, Ahmed A. & Shao, Li & Riffat, Saffa, 2009. "Interactions between louvers and ceiling geometry for maximum daylighting performance," Renewable Energy, Elsevier, vol. 34(1), pages 223-232.
    • Handle: RePEc:eee:renene:v:34:y:2009:i:1:p:223-232
    DOI: 10.1016/j.renene.2008.03.019
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    References listed on IDEAS

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    1. Littlefair, P.J. & Aizlewood, M.E. & Birtles, A.B., 1994. "The performance of innovative daylighting systems," Renewable Energy, Elsevier, vol. 5(5), pages 920-934.
    2. Tsangrassoulis, Aris & Bourdakis, Vassilis, 2003. "Comparison of radiosity and ray-tracing techniques with a practical design procedure for the prediction of daylight levels in atria," Renewable Energy, Elsevier, vol. 28(13), pages 2157-2162.
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    Cited by:

    1. Yibing Xue & Wenhan Liu, 2022. "A Study on Parametric Design Method for Optimization of Daylight in Commercial Building’s Atrium in Cold Regions," Sustainability, MDPI, vol. 14(13), pages 1-22, June.
    2. Seung-Ju Choe & Seung-Hoon Han, 2022. "Energy Balance Data-Based Optimization of Louver Installation Angles for Different Regions in Korea," Energies, MDPI, vol. 15(23), pages 1-17, December.
    3. Palmero-Marrero, Ana I. & Oliveira, Armando C., 2010. "Effect of louver shading devices on building energy requirements," Applied Energy, Elsevier, vol. 87(6), pages 2040-2049, June.
    4. Jifeng Song & Bizuayehu Bogale Dessie & Longyu Gao, 2023. "Analysis and Comparison of Daylighting Technologies: Light Pipe, Optical Fiber, and Heliostat," Sustainability, MDPI, vol. 15(14), pages 1-30, July.
    5. Kyung Sun Lee & Ki Jun Han & Jae Wook Lee, 2017. "The Impact of Shading Type and Azimuth Orientation on the Daylighting in a Classroom–Focusing on Effectiveness of Façade Shading, Comparing the Results of DA and UDI," Energies, MDPI, vol. 10(5), pages 1-20, May.
    6. Rakha, Tarek & Nassar, Khaled, 2011. "Genetic algorithms for ceiling form optimization in response to daylight levels," Renewable Energy, Elsevier, vol. 36(9), pages 2348-2356.

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