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Proceedings Paper

Recent developments in nonimaging secondary concentrators for linear receiver solar collectors
Author(s): Jeffrey M. Gordon
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Paper Abstract

The energetic and economic attractiveness of linear solar concentrators can be significantly improved by the use of properly secondary non-imaging (CPC-type) concentrators. Two specific illustrative cases are analyzed. One is the optical re-design of a commercial two-stage solar concentrator which generates process steam at 150 degree(s)C. The primary is a linear Fresnel reflector with one-axis horizontal tracking. The receiver is a stationary, non- evacuated, glazed tubular receiver with secondary CPC. We have re-designed the initial, manufacturer-designed secondary so as to noticeably improve collector thermal output. Details of secondary design and system performance are presented. The other is a new concept in secondary CPC-type concentrators for parabolic trough collectors with tubular receivers and large rim angles (typically 80 degree(s)-120 degree(s)). It had been though that such large-rim- angle concentrators could not benefit from secondary concentrators, since the second-stage concentration boost goes as 1/sin(rim angle). However, by introducing multiple asymmetric CPC-type devices, we can increase the geometric concentration of a 90 degree(s) rim angle parabolic trough by roughly a factor of 3. Furthermore, certain secondary designs can be accommodated within the annulus of currently-manufactured evacuated receiver tubes, and still offer a flux concentration improvement of about a factor of 2.5. Examples of the new secondary designs, and achievable concentration gains, are presented.

Paper Details

Date Published: 24 October 1991
PDF: 12 pages
Proc. SPIE 1528, Nonimaging Optics: Maximum Efficiency Light Transfer, (24 October 1991); doi: 10.1117/12.49128
Show Author Affiliations
Jeffrey M. Gordon, Ben Gurion Univ. of the Negev (Israel)

Published in SPIE Proceedings Vol. 1528:
Nonimaging Optics: Maximum Efficiency Light Transfer
Roland Winston; Robert L. Holman, Editor(s)

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