Comparison of asymmetrical and symmetrical nonimaging reflectors for east-west circular cylindrical solar receivers

David R. Mills; A. G. Monger; G. L. Morrison

doi:10.1117/12.49129

24 October 1991 Comparison of asymmetrical and symmetrical nonimaging reflectors for east-west circular cylindrical solar receivers

David R. Mills, A. G. Monger, G. L. Morrison

Author Affiliations +

Proceedings Volume 1528, Nonimaging Optics: Maximum Efficiency Light Transfer; (1991) https://doi.org/10.1117/12.49129
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

A computer simulation of the relative performance of certain truncated symmetrical and asymmetrical fixed reflector designs for solar energy collection was performed. The major results were as follows: (1) Annual solar fractions in excess of 90% seems to be feasible with a fixed load matching collector, in a climate where 70% of hot water requirements is the norm from flat plate collectors. Consumer interaction could either improve or lower this figure, depending upon circumstances. (2) Symmetrical CPC reflectors always gave the best annual output performance per unit of mirror area, and allowed the lowest receiver area for situations of constant annual load. (3) Asymmetrical fixed concentrators are most cost-effective for seasonally asymmetrical load patterns. (4) Fixed parabolic systems were not competitive. (5) The concentration levels utilizable in fixed systems are much higher than previously supposed, with approximately 3.1:1 in an asymmetrical reflector being optimal for the domestic load pattern used. (6) With seasonal load matching, the storage required to achieve solar fractions above 90% appears to be approximately one day of typical load.

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David R. Mills, A. G. Monger, and G. L. Morrison "Comparison of asymmetrical and symmetrical nonimaging reflectors for east-west circular cylindrical solar receivers", Proc. SPIE 1528, Nonimaging Optics: Maximum Efficiency Light Transfer, (24 October 1991); https://doi.org/10.1117/12.49129

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