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Journal of Photonics for Energy

Experimental characterization of Fresnel-Köhler concentrators
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Paper 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.

Paper Details

Date Published: 16 October 2012
PDF: 12 pages
J. Photon. Energy 2(1) 021806 doi: 10.1117/1.JPE.2.021806
Published in: Journal of Photonics for Energy Volume 2, Issue 1
Show Author Affiliations
Pablo Zamora, Univ. Politécnica de Madrid (Spain)
Pablo Benítez, Univ. Politécnica de Madrid (Spain)
Rubén Mohedano Arroyo, Light Prescriptions Innovators Europe, S. L. (Spain)
Aleksandra Cvetkovic, Light Prescriptions Innovators Europe, S. L. (Spain)
Juan F. Vilaplana, Light Prescriptions Innovators Europe, S. L. (Spain)
Yang Li, Light Prescriptions Innovators Europe, S. L. (Spain)
Maikel Hernández, Light Prescriptions Innovators Europe, S. L. (Spain)
Julio C. Chaves, Light Prescriptions Innovators Europe, S. L. (Spain)
Juan C. Miñano, Univ. Politécnica de Madrid (Spain)

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