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Proceedings Paper

Light redirecting system using sine-wave based panels for dense urban areas
Author(s): Mohamed W. N. Mohamed; Islam A. Mashaly; Osama N. Mohamed; Sally I. El-Henawy; Ola Galal; Iman Taha; Khaled Nassar; Amr M. E. Safwat
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Paper Abstract

Cities and towns around the world are becoming more condensed due to the shrinking amount of buildable areas, which significantly reduces the amount of light that occupants have access to. This lack of natural lighting results in health, safety and quality of life degradation. This paper presents a new technique of transmitting sunlight downward into narrow alleys and streets, by using a daylighting guiding acrylic panel that is capable of changing the direction and distribution of the incident light. The core of the proposed daylight guidance system is made up of light transmission panels with high quality. The corrugations have sine wave shaped cross-section so that the panel functions as an optical diffuser perpendicular to the direction of sunlight propagation. The day lighting system consists of the corrugated panels and a lattice frame, which supports the panel. The proposed system is to be mounted on the building roof facing the sun so as to redirect the incident sunlight downward into the narrow alleys or streets. Since building sizes and orientations are different the frame is arranged such that substantially deep light penetration and high luminance level can be achieved. Simulation results show that the proposed panel improves the illuminance values by more than 200% and 400% in autumn and winter, respectively, provides fan-out angle that exceeds 80° for certain solar altitudes and the transmitted power percentage varies from 40% to 90% as the solar altitude varies from 10° to 80°. Experimental results are in a good agreement with the simulations.

Paper Details

Date Published: 5 September 2014
PDF: 8 pages
Proc. SPIE 9191, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XI, 91910N (5 September 2014); doi: 10.1117/12.2065125
Show Author Affiliations
Mohamed W. N. Mohamed, Ain Shams Univ. (Egypt)
Islam A. Mashaly, The American Univ. in Cairo (Egypt)
Osama N. Mohamed, Ain Shams Univ. (Egypt)
Sally I. El-Henawy, Ain Shams Univ. (Egypt)
Ola Galal, Ain Shams Univ. (Egypt)
Iman Taha, Ain Shams Univ. (Egypt)
Khaled Nassar, The American Univ. in Cairo (Egypt)
Amr M. E. Safwat, Ain Shams Univ. (Egypt)

Published in SPIE Proceedings Vol. 9191:
Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XI
Roland Winston; Jeffrey M. Gordon, Editor(s)

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