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Evaluation of dichroic material for enhancing light pipe/natural ventilation and daylighting in an integrated system

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  • Elmualim, A. A.
  • Smith, S.
  • Riffat, S. B.
  • Shao, L.

Abstract

Integration of natural ventilation and daylighting in a single installation would make both technologies more attractive. One method for the integration is the use of concentric light pipe and ventilation stack. By constructing the light pipe using dichroic materials, the infrared part of the solar radiation is allowed to be transmitted to the stack but the visible light is guided by the light pipe into a room. The heat gain to the interior can be reduced and the thermal stack effect strengthened. Work presented here involved the experimental and computational evaluation of dichroic materials for enhancing both natural stack ventilation and daylighting. The transmittance of a dichroic light pipe was found to be similar to that of a light pipe with a 95% specular reflectance. The infra-red radiation transmitted through the dichroic material into a passive stack was found to enhance the natural ventilation flow by up to 14%. The effect is greater in summer than in winter, which is highly desirable as there is often a lack of driving force for natural stack ventilation in summer.

Suggested Citation

  • Elmualim, A. A. & Smith, S. & Riffat, S. B. & Shao, L., 1999. "Evaluation of dichroic material for enhancing light pipe/natural ventilation and daylighting in an integrated system," Applied Energy, Elsevier, vol. 62(4), pages 253-266, April.
    • Handle: RePEc:eee:appene:v:62:y:1999:i:4:p:253-266
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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. Rogora, A. & Palermo, G., 1994. "New component for daylighting: first italian application of a sun duct," Renewable Energy, Elsevier, vol. 5(5), pages 974-976.
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    Cited by:

    1. Kocifaj, M., 2009. "Efficient tubular light guide with two-component glazing with Lambertian diffuser and clear glass," Applied Energy, Elsevier, vol. 86(7-8), pages 1031-1036, July.
    2. Chong, Kok-Keong & Onubogu, Nneka Obianuju & Yew, Tiong-Keat & Wong, Chee-Woon & Tan, Woei-Chong, 2017. "Design and construction of active daylighting system using two-stage non-imaging solar concentrator," Applied Energy, Elsevier, vol. 207(C), pages 45-60.
    3. 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.

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