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Dependence on solar elevation of the performance of a light shelf as a potential daylighting device

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  • Soler, Alfonso
  • Oteiza, Pilar

Abstract

The performance of a light shelf, with a reflectance of about 91% after excluding the specular component (reflectance about 1%), providing for solar protection during the long, hot, dry summer season, is studied at Madrid (40.4° N, 4.4° W) using two scale models (1:10) with rectangular openings facing south, one taken as a reference and the other equipped with the light shelf As a shading device, the light shelf was designed for a vertical shade angle of 500, and thus had both, internal and external parts. The models were painted inside: walls and floor with a black matt paint, and the ceiling white matt. Measurements of mean hourly illuminances were obtained in each model at points at the same distances from the openings and corresponding to the working plane. In the present work we study for the points closest to the walls opposite the openings, and for days with clear skies, the dependence on solar elevation α of the ratio η = ElEr, El and Er respectively being the mean hourly illuminances measured in the model with the lightshelf and in the reference model.

Suggested Citation

  • Soler, Alfonso & Oteiza, Pilar, 1996. "Dependence on solar elevation of the performance of a light shelf as a potential daylighting device," Renewable Energy, Elsevier, vol. 8(1), pages 198-201.
    • Handle: RePEc:eee:renene:v:8:y:1996:i:1:p:198-201
    DOI: 10.1016/0960-1481(96)88845-8
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    References listed on IDEAS

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    1. Steemers, Koen, 1994. "Daylighting design: Enhancing energy efficiency and visual quality," Renewable Energy, Elsevier, vol. 5(5), pages 950-958.
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    Cited by:

    1. Michael, A. & Gregoriou, S. & Kalogirou, S.A., 2018. "Environmental assessment of an integrated adaptive system for the improvement of indoor visual comfort of existing buildings," Renewable Energy, Elsevier, vol. 115(C), pages 620-633.
    2. Gago, E.J. & Muneer, T. & Knez, M. & Köster, H., 2015. "Natural light controls and guides in buildings. Energy saving for electrical lighting, reduction of cooling load," Renewable and Sustainable Energy Reviews, Elsevier, vol. 41(C), pages 1-13.
    3. Antonis Kontadakis & Aris Tsangrassoulis & Lambros Doulos & Stelios Zerefos, 2017. "A Review of Light Shelf Designs for Daylit Environments," Sustainability, MDPI, vol. 10(1), pages 1-24, December.
    4. Wong, Ing Liang, 2017. "A review of daylighting design and implementation in buildings," Renewable and Sustainable Energy Reviews, Elsevier, vol. 74(C), pages 959-968.
    5. Heangwoo Lee, 2020. "A Basic Study on the Performance Evaluation of a Movable Light Shelf with a Rolling Reflector That Can Change Reflectivity to Improve the Visual Environment," IJERPH, MDPI, vol. 17(22), pages 1-19, November.

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