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International Journal of Photoenergy
Volume 2014, Article ID 787392, 9 pages
http://dx.doi.org/10.1155/2014/787392
Research Article

Achromatic Fresnel Lens with Improved Efficiency for PV Systems

1Applied Optics Complutense Group, Universidad Complutense de Madrid, Arcos del Jalón 118, 28037 Madrid, Spain
2Applied Optics Complutense Group, Universidad Complutense de Madrid, Facultad de Ciencias Físicas, Ciudad Universitaria, Plaza Ciencias, s/n, 28040 Madrid, Spain

Received 18 September 2013; Accepted 29 January 2014; Published 12 March 2014

Academic Editor: Xie Quan

Copyright © 2014 Mario González Montes et al. 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.

Abstract

This work is aimed to design and evaluate different achromatic Fresnel lens solutions capable of operating as concentrators aimed at photovoltaic cells systems. Throughout this study, the theoretical parametric design of the achromatic lens will be shown together with a series of simulations to verify the performance of each lens topology. The results will be compared with a standard Fresnel lens to ascertain the validity and effectiveness of the obtained design. Finally, a novel kind of hybrid lens is proposed, which combines the advantages of each type of lens (standard and Fresnel) according to the optimal operating region of each design. Efficiency and concentration ratios of each particular lens are shown, regarding lens dimension, light’s incidence angle, or wavelength. Through this innovative achromatic design concentration ratios above 1000 suns, which hardly reach standard Fresnel lenses. Furthermore chromatic dispersion is minimized and the efficiency rate is over 85% of efficiency for a wide spectral range (from 350 nm to 1100 nm).