LAPSE:2019.0228
Published Article
LAPSE:2019.0228
Comparison of Degradation on Aluminum Reflectors for Solar Collectors due to Outdoor Exposure and Accelerated Aging
Johannes Wette, Florian Sutter, Aránzazu Fernández-García, Stefan Ziegler, Reinhard Dasbach
February 5, 2019
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.
Keywords
accelerated aging, aluminum solar reflector, concentrated solar power, corrosion, degradation, durability
Suggested Citation
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. (2019). LAPSE:2019.0228
Author Affiliations
Wette J: DLR German Aerospace Center, Institute of Solar Research, Plataforma Solar de Almería, Ctra. Senés Km. 4, Apartado 39, E04200 Tabernas, Almería, Spain
Sutter F: DLR German Aerospace Center, Institute of Solar Research, Plataforma Solar de Almería, Ctra. Senés Km. 4, Apartado 39, E04200 Tabernas, Almería, Spain
Fernández-García A: Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Plataforma Solar de Almería, Ctra. Senés Km. 4, P.O. Box 44, E04200 Tabernas, Almería, Spain
Ziegler S: Alanod GmbH & Co. KG, Egerstr. 12, 58256 Ennepetal, Germany
Dasbach R: Almeco GmbH, Claude Breda Straße 3, 06406 Bernburg, Germany
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Journal Name
Energies
Volume
9
Issue
11
Article Number
E916
Year
2016
Publication Date
2016-11-05
Published Version
ISSN
1996-1073
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Original Submission
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PII: en9110916, Publication Type: Journal Article
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LAPSE:2019.0228
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doi:10.3390/en9110916
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Feb 5, 2019
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Calvin Tsay
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