Special Section on High and Low Concentrator Systems for Solar Electric Applications

Experimental characterization of Fresnel-Köhler concentrators

[+] Author Affiliations
Pablo Zamora

Universidad Politécnica de Madrid, Cedint, Campus Montegancedo-UPM, 28223 Madrid, Spain

Pablo Benítez

Universidad Politécnica de Madrid, Cedint, Campus Montegancedo-UPM, 28223 Madrid, Spain

LPI, Campus Montegancedo, 28223 Madrid (Spain) and 2400 Lincoln Avenue, Altadena, California 91001

Rubén Mohedano

LPI, Campus Montegancedo, 28223 Madrid (Spain) and 2400 Lincoln Avenue, Altadena, California 91001

Aleksandra Cvetković

LPI, Campus Montegancedo, 28223 Madrid (Spain) and 2400 Lincoln Avenue, Altadena, California 91001

Juan Vilaplana

LPI, Campus Montegancedo, 28223 Madrid (Spain) and 2400 Lincoln Avenue, Altadena, California 91001

Yang Li

Universidad Politécnica de Madrid, Cedint, Campus Montegancedo-UPM, 28223 Madrid, Spain

Maikel Hernández

LPI, Campus Montegancedo, 28223 Madrid (Spain) and 2400 Lincoln Avenue, Altadena, California 91001

Julio Chaves

LPI, Campus Montegancedo, 28223 Madrid (Spain) and 2400 Lincoln Avenue, Altadena, California 91001

Juan C. Miñano

Universidad Politécnica de Madrid, Cedint, Campus Montegancedo-UPM, 28223 Madrid, Spain

LPI, Campus Montegancedo, 28223 Madrid (Spain) and 2400 Lincoln Avenue, Altadena, California 91001

J. Photon. Energy. 2(1), 021806 (Oct 16, 2012). doi:10.1117/1.JPE.2.021806
History: Received May 9, 2012; Revised July 27, 2012; Accepted September 14, 2012
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Abstract.  Most cost-effective concentrated photovoltaics (CPV) systems are based on an optical train comprising two stages, the first being a Fresnel lens. Among them, the Fresnel-Köhler (FK) concentrator stands out owing to both performance and practical reasons. We describe the experimental measurements procedure for FK concentrator modules. This procedure includes three main types of measurements: electrical efficiency, acceptance angle, and irradiance uniformity at the solar cell plane. We have collected here the performance features of two different FK prototypes (ranging different f-numbers, concentration ratios, and cell sizes). The electrical efficiencies measured in both prototypes are high and fit well with the models, achieving values up to 32.7% (temperature corrected, and with no antireflective coating on SOE or POE surfaces) in the best case. The measured angular transmission curves show large acceptance angles, again perfectly matching the expected values [measured concentration acceptance product (CAP) values over 0.56]. The irradiance pattern on the cell (obtained with a digital camera) shows an almost perfectly uniform distribution, as predicted by raytrace simulations. All these excellent on-sun results confirm the FK concentrator as a potentially cost-effective solution for the CPV market.

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© 2012 Society of Photo-Optical Instrumentation Engineers

Citation

Pablo Zamora ; Pablo Benítez ; Rubén Mohedano ; Aleksandra Cvetković ; Juan Vilaplana, et al.
"Experimental characterization of Fresnel-Köhler concentrators", J. Photon. Energy. 2(1), 021806 (Oct 16, 2012). ; http://dx.doi.org/10.1117/1.JPE.2.021806


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