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Journal of Photonics for Energy

Effect of reflection losses on stationary dielectric-filled nonimaging concentrators
Author(s): Srikanth Madala; Robert F. Boehm
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Paper Abstract

The effect of Fresnel reflection and total internal reflection (TIR) losses on the performance parameters in refractive solar concentrators has often been downplayed because most refractive solar concentrators are traditionally the imaging type, yielding a line or point image on the absorber surface when solely interacted with paraxial etendue ensured by solar tracking. Whereas, with refractive-type nonimaging solar concentrators that achieve two-dimensional (rectangular strip) focus or three-dimensional (circular or elliptical) focus through interaction with both paraxial and nonparaxial etendue within the acceptance angle, the Fresnel reflection and TIR losses are significant as they will affect the performance parameters and, thereby, energy collection. A raytracing analysis has been carried out to illustrate the effects of Fresnel reflection and TIR losses on four different types of stationary dielectric-filled nonimaging concentrators, namely V-trough, compound parabolic concentrator, compound elliptical concentrator, and compound hyperbolic concentrator. The refractive index (RI) of a dielectric fill material determines the acceptance angle of a solid nonimaging collector. Larger refractive indices yield larger acceptance angles and, thereby, larger energy collection. However, they also increase the Fresnel reflection losses. This paper also assesses the relative benefit of increasing RI from an energy collection standpoint.

Paper Details

Date Published: 14 November 2016
PDF: 14 pages
J. Photon. Energy 6(4) 047002 doi: 10.1117/1.JPE.6.047002
Published in: Journal of Photonics for Energy Volume 6, Issue 4
Show Author Affiliations
Srikanth Madala, Univ. of Nevada, Las Vegas (United States)
Robert F. Boehm, Univ. of Nevada, Las Vegas (United States)

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