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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.
Atsushi Akisawa,Takayuki Sato,Takahiko Miyazaki,Takao Kashiwagi, andMasao Hiramatsu
"High concentration non-imaging Fresnel lens design with flat upper surface", Proc. SPIE 6649, High and Low Concentration for Solar Electric Applications II, 66490F (11 September 2007); https://doi.org/10.1117/12.734115
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Atsushi Akisawa, Takayuki Sato, Takahiko Miyazaki, Takao Kashiwagi, Masao Hiramatsu, "High concentration non-imaging Fresnel lens design with flat upper surface," Proc. SPIE 6649, High and Low Concentration for Solar Electric Applications II, 66490F (11 September 2007); https://doi.org/10.1117/12.734115