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

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 requi...

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Bibliographic Details
Published in:Energies (Basel) 2016-11, Vol.9 (11), p.916-916
Main Authors: Wette, Johannes, Sutter, Florian, Fernandez-Garcia, Aranzazu, Ziegler, Stefan, Dasbach, Reinhard
Format: Article
Language:English
Subjects:
accelerated aging
Accelerated aging tests
Accelerated tests
Aging
Alternative energy
Aluminum
aluminum solar reflector
concentrated solar power
corrosion
Degradation
durability
Exposure
Glass substrates
Mirrors
Outdoor
Outdoors
Reflectors
Renewable resources
Solar energy
Thermal energy
Weathering
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Summary: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.
ISSN:1996-1073
1996-1073
DOI:10.3390/en9110916