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Proceedings Paper

Design, construction, and measurement of a dielectric single-mirror two-stage (DSMTS) photovoltaic concentrator
Author(s): Ruben Mohedano Arroyo; Pablo Benitez; Juan Carlos Minano; Francisco Bercero; Pablo Lobato
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Paper Abstract

The 30 X DSMTS is a trough-like photovoltaic concentrator, meant to track the sun in one axis, which has a mirror allocating two concentration stages and a secondary lens that increases its acceptance up to +/- 2.3 degrees. Provided that the sun subtends an angle of +/- 0.256 degrees, such acceptance seems excessive. However, thanks to it, we can relax requirements that often demand accuracy in systems of the kind. For instance, the shape of the mirror can be achieved by simply bending an aluminum sheet. To foresee the results we may expect of this strategy, we carried out some mechanical calculations, whose results are the boundary conditions that lead to a minimum standard deviation on the local slope of the elastic mirror with regards to the theoretical value. We checked by ray tracing that such an error actually provoked a small decrease on the acceptance. This fact persuaded us to carry out the manufacture of two elastic prototypes. In the test that have been performed so far with them we achieved an acceptance angle of +/- 1.63 degrees and a collection efficiency of 98 percent at a geometrical concentration of 30 times, results that can be considered as outstanding in the photovoltaics framework.

Paper Details

Date Published: 19 November 2001
PDF: 12 pages
Proc. SPIE 4446, Nonimaging Optics: Maximum Efficiency Light Transfer VI, (19 November 2001); doi: 10.1117/12.448827
Show Author Affiliations
Ruben Mohedano Arroyo, Univ. Politecnica de Madrid (Spain)
Pablo Benitez, Univ. Politecnica de Madrid (Spain)
Juan Carlos Minano, Univ. Politecnica de Madrid (Spain)
Francisco Bercero, Univ. Politecnica de Madrid (Spain)
Pablo Lobato, Univ. Politecnica de Madrid (Spain)

Published in SPIE Proceedings Vol. 4446:
Nonimaging Optics: Maximum Efficiency Light Transfer VI
Roland Winston, Editor(s)

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