4 April 2017 Thermodynamics and the segmented compound parabolic concentrator
Author Affiliations +
J. of Photonics for Energy, 7(2), 028002 (2017). doi:10.1117/1.JPE.7.028002
Compound parabolic concentrator (CPC) reflector profiles are complex and can be difficult to manufacture using traditional methods. Computer numeric control machines, however, can approximate complex profiles by bending a series of small flat segments. We investigate the relationship between the number of segments and the optical transmission of a CPC approximated by equal length segments whose start and end points lie along the CPC profile. We also investigate a separate method for generating CPC-like profiles by adjusting the angle of each segment to satisfy the edge-ray principle. Three variations of this method are examined where the edge-ray condition is taken from the start, mid, and end points of each segment. A flux efficiency (FE) to compare concentrators, which combines the concentration ratio and optical efficiency, is introduced and directly relates to the maximum achievable flux on the absorber. We demonstrate that the FE defined is another way to look at the compromises one makes for a geometric concentrator designed under real-world constraints.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Bennett K. Widyolar, Lun Jiang, Roland Winston, "Thermodynamics and the segmented compound parabolic concentrator," Journal of Photonics for Energy 7(2), 028002 (4 April 2017). https://doi.org/10.1117/1.JPE.7.028002 Submission: Received 2 February 2017; Accepted 14 March 2017
Submission: Received 2 February 2017; Accepted 14 March 2017

Compound parabolic concentrators

Solar concentrators




Geometrical optics

Nonimaging optics


How nonimaging optics began
Proceedings of SPIE (September 08 2016)
Flow line asymmetric nonimaging concentrating optics
Proceedings of SPIE (September 14 2016)
Thermodynamic investigation of the segmented CPC
Proceedings of SPIE (September 07 2017)
Development Of Nonimaging Optics
Proceedings of SPIE (January 05 1984)

Back to Top