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Energies 2015, 8(7), 7185-7201; doi:10.3390/en8077185

Development of Optical Fiber-Based Daylighting System and Its Comparison

1
Graduate Institute of Color and Illumination Technology, National Taiwan University of Science and Technology, #43, Section 4, Keelung Road, Taipei 106, Taiwan
2
Graduate Institute of Electro-Optical Engineering, National Taiwan University of Science and Technology, #43, Section 4, Keelung Road, Taipei 106, Taiwan
3
Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, #43, Section 4, Keelung Road, Taipei 106, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Jean-Michel Nunzi
Received: 7 June 2015 / Revised: 6 July 2015 / Accepted: 7 July 2015 / Published: 15 July 2015
View Full-Text   |   Download PDF [4493 KB, uploaded 15 July 2015]   |  

Abstract

Fiber-optic daylighting systems have been shown to be a promising and effective way to transmit sunlight in the interior space whilst reducing electric lighting energy consumption. To increase efficiency in terms of providing uniform illumination in the interior, the current need is to illuminate optical fiber-bundle with uniform light flux. To this end, we propose a method for achieving collimated light, which illuminates the fiber-bundle uniformly. Light is collected through a parabolic concentrator and focused toward a collimating lens, which distributes the light over each optical fiber. An optics diffusing structure is utilized at the end side of the fiber bundle to spread light in the interior. The results clearly reveal that the efficiency in terms of uniform illumination, which also reduces the heat problem for optical fibers, is improved. Furthermore, a comparison study is conducted between current and previous approaches. As a result, the proposed daylighting system turns out convenient in terms of energy saving and reduction in greenhouse gas emissions. View Full-Text
Keywords: solar concentrator; daylighting; uniform illumination; daylight modeling solar concentrator; daylighting; uniform illumination; daylight modeling
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ullah, I.; Whang, A.J.-W. Development of Optical Fiber-Based Daylighting System and Its Comparison. Energies 2015, 8, 7185-7201.

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