Truncation of the secondary concentrator (CPC) between maximum performances and economical requirements

A. Segal; M. Epstein

doi:10.1117/12.825447

20 August 2009 Truncation of the secondary concentrator (CPC) between maximum performances and economical requirements

A. Segal, M. Epstein

Proceedings Volume 7423, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VI; 74230H (2009) https://doi.org/10.1117/12.825447
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

A central solar plant, based on beam-down optics, is composed of a field of heliostats, a tower reflector and a ground receiver. The tower reflector is an optical system comprises of a quadric surface mirror (hyperboloid), where its upper focal point coincides with the aim point of a heliostat field and its lower focal point is located at a specified height, coinciding with the entrance plane of the ground receiver. The optics of a tower reflector requires the use of ground secondary concentrator, composed of a cluster of CPCs, because the quadric surface mirror always magnifies the sun image. There is an intrinsic correlation between the tower reflector position and its size on one hand, and the geometry, dimensions and reflective area of the secondary concentrator on the other hand; both are related to the heliostat field reflective area. Obviously, when one wishes to have a smaller tower reflector by placing it closer to the upper focal point, the image created at the lower focus will be larger, resulting in a larger secondary ground concentrator. The present work analyses the ways for a substantial decrease of the size of the ground concentrator cluster (and, implicit, the concentrators area) via truncation, without significant sacrifice of the performance, although some increase of the optical losses is inevitable. This offers a method for cost effective design of future central solar plants utilizing the beam down optics.

Citation Download Citation

A. Segal and M. Epstein "Truncation of the secondary concentrator (CPC) between maximum performances and economical requirements", Proc. SPIE 7423, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VI, 74230H (20 August 2009); https://doi.org/10.1117/12.825447

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KEYWORDS

Compound parabolic concentrators

Receivers

Solar concentrators

Medium wave

Reflectors

Reflectivity

Mirrors

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