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

Wette, Johannes and Sutter, Florian and Fernandez-Garcia, Aranzazu and Ziegler, Stefan and Dasbach, Reinhard (2016) Comparison of Degradation on Aluminum Reflectors for Solar Collectors due to Outdoor Exposures and Accelerated Aging. Energies, 9 (916). Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/en9110916. ISSN 1996-1073.

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Official URL: http://www.mdpi.com/journal/energies


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.

Item URL in elib:https://elib.dlr.de/108349/
Document Type:Article
Title:Comparison of Degradation on Aluminum Reflectors for Solar Collectors due to Outdoor Exposures and Accelerated Aging
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Wette, JohannesUNSPECIFIEDhttps://orcid.org/0000-0003-1389-5176UNSPECIFIED
Sutter, FlorianUNSPECIFIEDhttps://orcid.org/0000-0002-2981-5807UNSPECIFIED
Date:November 2016
Journal or Publication Title:Energies
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Keywords:concentrated solar power; accelerated aging; degradation; durability; aluminum solar reflector; corrosion
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Impact of Desert Environment (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Qualifizierung
Deposited By: Kruschinski, Anja
Deposited On:05 Dec 2016 14:31
Last Modified:03 Nov 2023 07:28

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