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Proceedings Paper

High concentration non-imaging Fresnel lens design with flat upper surface
Author(s): Atsushi Akisawa; Takayuki Sato; Takahiko Miyazaki; Takao Kashiwagi; Masao Hiramatsu
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Paper Abstract

Concentration PV systems are emerging recently and primary lenses have been developed for concentrating solar incident. Although the authors already produced 500X dome-shaped Fresnel lens, its production process was complicated because of the shape. The objective of this study is to investigate new design method for non-imaging Fresnel with flat upper surface so that the production can be easier. The design of prisms is formulated by means of non-linear optimization to have maximum acceptance half angle with edge-ray principle. It is shown that designing more than 500X flat Fresnel lens is possible. The study also presents optimal condition of lens size requiring energy payback year to satisfy from the viewpoint of life cycle energy production and consumption.

Paper Details

Date Published: 11 September 2007
PDF: 8 pages
Proc. SPIE 6649, High and Low Concentration for Solar Electric Applications II, 66490F (11 September 2007); doi: 10.1117/12.734115
Show Author Affiliations
Atsushi Akisawa, Tokyo Univ. of Agriculture and Technology (Japan)
Takayuki Sato, Tokyo Univ. of Agriculture and Technology (Japan)
Takahiko Miyazaki, Tokyo Univ. of Agriculture and Technology (Japan)
Takao Kashiwagi, Tokyo Institute of Technology (Japan)
Masao Hiramatsu, Daido Metal Co., Ltd. (Japan)

Published in SPIE Proceedings Vol. 6649:
High and Low Concentration for Solar Electric Applications II
Martha Symko-Davies, Editor(s)

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