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Proceedings Paper

A cascadable circular concentrator with parallel compressed structure for increasing the energy density
Author(s): Nai-Lun Ku; Yi-Yung Chen; Wei-Che Hsieh; Allen Jong-Woei Whang
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Paper Abstract

Due to the energy crisis, the principle of green energy gains popularity. This leads the increasing interest in renewable energy such as solar energy. Thus, how to collect the sunlight for indoor illumination becomes our ultimate target. With the environmental awareness increasing, we use the nature light as the light source. Then we start to devote the development of solar collecting system. The Natural Light Guiding System includes three parts, collecting, transmitting and lighting part. The idea of our solar collecting system design is a concept for combining the buildings with a combination of collecting modules. Therefore, we can use it anyplace where the sunlight can directly impinges on buildings with collecting elements. In the meantime, while collecting the sunlight with high efficiency, we can transmit the sunlight into indoor through shorter distance zone by light pipe where we needs the light. We proposed a novel design including disk-type collective lens module. With the design, we can let the incident light and exit light be parallel and compressed. By the parallel and compressed design, we make every output light become compressed in the proposed optical structure. In this way, we can increase the ratio about light compression, get the better efficiency and let the energy distribution more uniform for indoor illumination. By the definition of "KPI" as an performance index about light density as following: lm/(mm)2, the simulation results show that the proposed Concentrator is 40,000,000 KPI much better than the 800,000 KPI measured from the traditional ones.

Paper Details

Date Published: 21 February 2012
PDF: 9 pages
Proc. SPIE 8256, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices, 825619 (21 February 2012); doi: 10.1117/12.909878
Show Author Affiliations
Nai-Lun Ku, National Taiwan Univ. of Science and Technology (Taiwan)
Yi-Yung Chen, National Taiwan Univ. of Science and Technology (Taiwan)
Wei-Che Hsieh, National Taiwan Univ. of Science and Technology (Taiwan)
Allen Jong-Woei Whang, National Taiwan Univ. of Science and Technology (Taiwan)

Published in SPIE Proceedings Vol. 8256:
Physics, Simulation, and Photonic Engineering of Photovoltaic Devices
Alexandre Freundlich; Jean-Francois F. Guillemoles, Editor(s)

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