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Energies 2016, 9(11), 916; doi:10.3390/en9110916

Comparison of Degradation on Aluminum Reflectors for Solar Collectors due to Outdoor Exposure and Accelerated Aging

1
DLR German Aerospace Center, Institute of Solar Research, Plataforma Solar de Almería, Ctra. Senés Km. 4, Apartado 39, E04200 Tabernas, Almería, Spain
2
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Plataforma Solar de Almería, Ctra. Senés Km. 4, P.O. Box 44, E04200 Tabernas, Almería, Spain
3
Alanod GmbH & Co. KG, Egerstr. 12, 58256 Ennepetal, Germany
4
Almeco GmbH, Claude Breda Straße 3, 06406 Bernburg, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Francisco Manzano Agugliaro
Received: 28 September 2016 / Revised: 31 October 2016 / Accepted: 1 November 2016 / Published: 5 November 2016
(This article belongs to the Special Issue Urban Generation of Renewable Energy and Sustainable Cities)
View Full-Text   |   Download PDF [6679 KB, uploaded 5 November 2016]   |  

Abstract

Reflectors for concentrated solar thermal technologies need to withstand 20 or even 30 years of outdoor exposure without significant loss of solar specular reflectance. In order to test the durability of innovative reflectors within a shorter period of time, an accelerated aging methodology is required. The problem with accelerated testing is that poor correlation between laboratory and field test results has been achieved in the past. This is mainly because unrealistic degradation mechanisms are accelerated in the weathering chambers. In order to define a realistic testing procedure, a high number of accelerated aging tests have been performed on differently coated aluminum reflectors. The degradation mechanisms of the accelerated tests have been classified and systematically compared to samples that have been exposed at nine different exposure sites outdoors. Besides the standardized aging tests, innovative aging procedures have been developed in such way that the agreement to the degradation pattern observed outdoors is increased. Although degradation depends on materials and location, five generic degradation mechanisms were detected. Standardized tests only reproduced one or two of the five mechanisms detected outdoors. Additionally, several degradation effects that were not observed outdoors appeared. The innovative accelerated aging tests of artificially soiled samples were able to reproduce three of the five mechanisms observed outdoors, presenting a much more realistic overall degradation pattern. View Full-Text
Keywords: concentrated solar power; accelerated aging; degradation; durability; aluminum solar reflector; corrosion concentrated solar power; accelerated aging; degradation; durability; aluminum solar reflector; corrosion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wette, J.; Sutter, F.; Fernández-García, A.; Ziegler, S.; Dasbach, R. Comparison of Degradation on Aluminum Reflectors for Solar Collectors due to Outdoor Exposure and Accelerated Aging. Energies 2016, 9, 916.

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