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Proceedings Paper

High efficient solar tracker based on a simple shutter structure
Author(s): Jin-Jia Chen; Te-Shu Liu; Kuang-Lung Huang; Po-Chih Lin
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Paper Abstract

In many photovoltaic (PV) or sunlight-illumination systems, solar trackers are always essential to obtain high energy/flux concentration efficiency, and that would lead to increase cost and extra power consumption due to the complex structure and heavy weight of the trackers. To decrease the cost while without sacrificing efficiency, a Fresnellens concentrator incorporated with a simple and cheap shutter, which consists of high reflective mirrors instead of conventional trackers, is proposed in this paper to provide solar tracking during the daytime. Thus, the time-variant and slant-incident sunlight rays can be redirected to vertically incident upon the surface of the Fresnel lens by appropriately arranging mirrors and swinging them to the proper slant angles with respect to the orientation of sunlight. The computer simulation results show that power concentration efficiency over 90%, as compared with the efficiency of directly normal incident sunlight, can be achieved with the mirror reflectance of 0.97 and for any solar incident angle within ±75 degrees to the normal of the Fresnel lens. To verify the feasibility and performance of the concentrator with the proposed shutter, a sunlight illumination system based on this novel structure is demonstrated. Both computer simulation and practical measurement results for the prototype of the sunlight illumination system are also given to compare with. The results prove the simple and high efficient shutter applicable to general PV or sunlight-illumination systems for solar tracking.

Paper Details

Date Published: 18 September 2013
PDF: 7 pages
Proc. SPIE 8834, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration X, 88340X (18 September 2013); doi: 10.1117/12.2022832
Show Author Affiliations
Jin-Jia Chen, National Changhua Univ. of Education (Taiwan)
Te-Shu Liu, National Changhua Univ. of Education (Taiwan)
Kuang-Lung Huang, MingDao Univ. (Taiwan)
Po-Chih Lin, National Changhua Univ. of Education (Taiwan)

Published in SPIE Proceedings Vol. 8834:
Nonimaging Optics: Efficient Design for Illumination and Solar Concentration X
Roland Winston; Jeffrey Gordon, Editor(s)

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