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  4. Absorber Surface Durability Standard Testing
 
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2017
Conference Paper
Title

Absorber Surface Durability Standard Testing

Title Supplement
ISO 22975-3 vs. Measured Thermal Stress At Extreme Test Site
Abstract
Solar absorbers, as a key component in solar thermal collectors, are in the focus of this paper. A well introduced durability testing method for the solar absorber is the testing procedure described in ISO 22975-3 [1]. This standard testing procedure is applicable to the determination of the long term behavior and service life of selective solar absorbers for use in vented flat plate solar collectors. Different samples of solar absorbers on aluminum and copper substrates are characterized before, during and after the accelerated ageing tests and outdoor exposure with various methods, including FT-IR spectroscopy and microscopic technologies like AFM microscopy to measure the degradation on different scales. It turned out, that the corresponding testing time of the procedure for high temperature test was less than in the standard ISO 22975-3. Therefore, the standard testing procedure is testing at higher thermal loads then the extreme test sites with high absorber temperature in constant stagnation mode.
Author(s)
Kaltenbach, Thomas.
Fraunhofer-Institut für Solare Energiesysteme ISE  
Heck, Markus
Fraunhofer-Institut für Solare Energiesysteme ISE  
Weiß, Karl-Anders  
Fraunhofer-Institut für Solare Energiesysteme ISE  
Mainwork
ISES Solar World Congress : International Solar Energy Society, SWC 2017  
Conference
International Conference on Solar Heating and Cooling for Buildings and Industry (SHC) 2017  
DOI
10.18086/swc.2017.19.06
Language
English
Fraunhofer-Institut für Solare Energiesysteme ISE  
Keyword(s)
  • Solar absorber

  • components for collectors

  • durability

  • accelerated ageing

  • optical characterization

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