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Proceedings Paper

Development and testing of high concentration flat-plate Fresnel lenses
Author(s): M. Z. Shvarts; A. A. Soluyanov
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Paper Abstract

In the work, stages of designing, optimizing, manufacturing and testing the circular flat-plate Fresnel lenses (FLs) for photovoltaic modules with multi-junction solar cells (SCs) are presented. A mathematical model based on ray tracing has been developed for optimizing lenses design parameters and calculating their optical-power characteristics (OPCs). In searching the optimum combination of the lens aperture, its focal distance and refracting profile parameters, the optimization criterion was the maximum of the average sunlight concentration at high optical efficiency in the focal spot of minimum size. Analysis of OPCs of circular Fresnel lenses with conical (the generatrix of surface is a straight line) and curvilinear (the generatrix of surface is a curved line) refracting surfaces has been carried out. Fresnel lens specimens were fabricated and a control of their profile parameters has been done. Experimental lens OPCs have been obtained with use of newly developed optical test bench. A degree of the effect of the light flux and Fresnel lens geometrical imperfections on validity of the experimental data interpretation has been determined. To establish the lens optical efficiency values at standard irradiance conditions, the correction of the calculation model was done. Also, the effect of temperature on the lens optical efficiency is studied.

Paper Details

Date Published: 21 August 2009
PDF: 10 pages
Proc. SPIE 7423, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VI, 74230G (21 August 2009); doi: 10.1117/12.825614
Show Author Affiliations
M. Z. Shvarts, Ioffe Physico-Technical Institute (Russian Federation)
A. A. Soluyanov, Technoexan Ltd. (Russian Federation)

Published in SPIE Proceedings Vol. 7423:
Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VI
Roland Winston; Jeffrey M. Gordon, Editor(s)

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