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Luminous effectiveness of tubular light-guides in tropics

Author

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  • Darula, Stanislav
  • Kittler, Richard
  • Kocifaj, Miroslav

Abstract

Novel tubular light-guides with a transparent hemispherical cupola placed on an unobstructed flat roof collect all sunlight and skylight available at ground level year round. This advantage is heightened in the dry and sunny tropical regions where the sun rises to very high altitudes and often the hours of sunshine last throughout the whole day. Hollow light-guides with very high inner specular reflectances can transport sunbeams downward into the windowless building core very effectively. Due to the tube's diameter and length and multiple reflections, complex illuminance patterns are produced on the underside of the tube, i.e. on top of the glazed ceiling aperture that illuminates the interior space or its working plane. This paper discusses several daylight conditions in tropical interiors illuminated by tubular light-guides. The recently published HOLIGILM calculation program and the user-friendly tool HOLIGILM 4.2 have facilitated the production of this paper.

Suggested Citation

  • Darula, Stanislav & Kittler, Richard & Kocifaj, Miroslav, 2010. "Luminous effectiveness of tubular light-guides in tropics," Applied Energy, Elsevier, vol. 87(11), pages 3460-3466, November.
    • Handle: RePEc:eee:appene:v:87:y:2010:i:11:p:3460-3466
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    References listed on IDEAS

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    1. Li, Danny H.W. & Tsang, Ernest K.W. & Cheung, K.L. & Tam, C.O., 2010. "An analysis of light-pipe system via full-scale measurements," Applied Energy, Elsevier, vol. 87(3), pages 799-805, March.
    2. Jenkins, David & Muneer, Tariq, 2004. "Light-pipe prediction methods," Applied Energy, Elsevier, vol. 79(1), pages 77-86, September.
    3. 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.
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    Cited by:

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    2. Janjai, Serm & Plaon, Piyanuch, 2011. "Estimation of sky luminance in the tropics using artificial neural networks: Modeling and performance comparison with the CIE model," Applied Energy, Elsevier, vol. 88(3), pages 840-847, March.
    3. Freire, Roberto Zanetti & Mazuroski, Walter & Abadie, Marc Olivier & Mendes, Nathan, 2011. "Capacitive effect on the heat transfer through building glazing systems," Applied Energy, Elsevier, vol. 88(12), pages 4310-4319.
    4. Mangkuto, Rizki A. & Rohmah, Mardliyahtur & Asri, Anindya Dian, 2016. "Design optimisation for window size, orientation, and wall reflectance with regard to various daylight metrics and lighting energy demand: A case study of buildings in the tropics," Applied Energy, Elsevier, vol. 164(C), pages 211-219.
    5. Bangdi Zhou & Kaiyan He & Ziqian Chen & Shuiku Zhong, 2022. "Fixed Fiber Light Guide System with Concave Outlet Concentrators," Energies, MDPI, vol. 15(3), pages 1-16, January.
    6. Pattarapanitchai, S. & Janjai, S. & Tohsing, K. & Prathumsit, J., 2015. "A technique to map monthly average global illuminance from satellite data in the tropics using a simple semi-empirical model," Renewable Energy, Elsevier, vol. 74(C), pages 170-175.

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