Optimized CPC-type concentrators built of plane facets

Andreas Timinger; Abraham Kribus; Pinchas Doron; Harald Ries

doi:10.1117/12.368261

6 October 1999 Optimized CPC-type concentrators built of plane facets

Andreas Timinger, Abraham Kribus, Pinchas Doron, Harald Ries

Proceedings Volume 3781, Nonimaging Optics: Maximum Efficiency Light Transfer V; (1999) https://doi.org/10.1117/12.368261
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

Compound parabolic concentrators (CPCs) are good candidates for secondary concentrators in solar applications. Practical considerations, however, sometimes dictate the use of planar as opposed to curved reflectors. In addition polygonal apertures may be desired in order to tile a large area with several smaller secondary concentrators. We analyze in our contribution secondary concentrators which approximate a CPC but consist of plane facets with various numbers of subdivisions in axial and circumferential direction. We found that an `intuitive' axial profile with a constant angle between neighboring facets does not lead to optimal performance. We optimized by ray-tracing the size and orientation of the facets and found concentrators with significantly higher performance as compared to the `intuitively' facetted CPCs. The resulting shapes are usually significantly longer than classical CPCs. The higher the reflectivity of the surfaces, the longer the optimized concentrators get, approaching the infinite cone as an ideal concentrator for perfect reflectivity.

Citation Download Citation

Andreas Timinger, Abraham Kribus, Pinchas Doron, and Harald Ries "Optimized CPC-type concentrators built of plane facets", Proc. SPIE 3781, Nonimaging Optics: Maximum Efficiency Light Transfer V, (6 October 1999); https://doi.org/10.1117/12.368261

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