Light redirecting system using sine-wave based panels for dense urban areas

Mohamed W. N. Mohamed; Islam A. Mashaly; Osama N. Mohamed; Sally I. El-Henawy; Ola Galal; Iman Taha; Khaled Nassar; Amr M. E. Safwat

doi:10.1117/12.2065125

5 September 2014 Light redirecting system using sine-wave based panels for dense urban areas

Mohamed W. N. Mohamed, Islam A. Mashaly, Osama N. Mohamed, Sally I. El-Henawy, Ola Galal, Iman Taha, Khaled Nassar, Amr M. E. Safwat

Author Affiliations +

Proceedings Volume 9191, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XI; 91910N (2014) https://doi.org/10.1117/12.2065125
Event: SPIE Optical Engineering + Applications, 2014, San Diego, California, United States

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.

Citation Download Citation

Mohamed W. N. Mohamed, Islam A. Mashaly, Osama N. Mohamed, Sally I. El-Henawy, Ola Galal, Iman Taha, Khaled Nassar, and Amr M. E. Safwat "Light redirecting system using sine-wave based panels for dense urban areas", Proc. SPIE 9191, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XI, 91910N (5 September 2014); https://doi.org/10.1117/12.2065125

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available