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Abstract
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| The effect of soiling in flat PV modules has been already studied, causing an averaged electrical output reduction near 4%. In principle, as far as soiling produces light scattering at the optical collector surface, the scattered rays in concentrator systems should be definitively lost because they cannot be focused on the receivers. While the theoretical study becomes difficult because the scattering is variable at different sites and due to different types of dust, it becomes easier to begin the monitoring of the real field performance of concentrators and then raise the following questions: how much affect the soiling to PV concentrators in comparison with flat panels?¿, ¿is the effect of the soiling related to the concentration level?¿ and ¿is the nature of the optics (reflective or refractive system) relevant in the obtained results?¿ Answers are a clue in order to predict the PV concentrator electrical performance and to establish how often the concentrators must be cleaned. A first and simple experiment is being carried at the IESUPM site, located in Madrid city, practically in downtown, consisting in four low-concentrators systems (2X, 10X, 20X and 40X), one high-concentrator system (250X) and one flat module. All systems have been measured when soiled and after cleaning, achieving different increases of ISC that are up to 26.2%, after 4 months without heavy rain, for the CPV systems when they are soiled in comparison with the 2-4% of the flat panel. | |
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International
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Si |
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Congress
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33rd IEEE Photovoltaic Specialists Conference PVSC 33 |
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960 |
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Place
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San Diego, California, USA |
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Reviewers
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Si |
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ISBN/ISSN
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978-1-4244-1641-7 |
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Start Date
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11/05/2008 |
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End Date
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16/05/2008 |
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From page
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991 |
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To page
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994 |
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Conference proceedings |