Step-Stress Accelerated Degradation Testing for Solar Reflectors: Preprint

Research output: Contribution to conferencePaper


To meet the challenge to reduce the cost of electricity generated with concentrating solar power (CSP) new low-cost reflector materials are being developed including metalized polymer reflectors and must be tested and validated against appropriate failure mechanisms. We explore the application of testing methods and statistical inference techniques for quantifying estimates and improvinglifetimes of concentrating solar power (CSP) reflectors associated with failure mechanisms initiated by exposure to the ultraviolet (UV) part of the solar spectrum. In general, a suite of durability and reliability tests are available for testing a variety of failure mechanisms where the results of a set are required to understand overall lifetime of a CSP reflector. We will focus on the use ofthe Ultra-Accelerated Weathering System (UAWS) as a testing device for assessing various degradation patterns attributable to accelerated UV exposure. Depending on number of samples, test conditions, degradation and failure patterns, test results may be used to derive insight into failure mechanisms, associated physical parameters, lifetimes and uncertainties. In the most complicated casewarranting advanced planning and statistical inference, step-stress accelerated degradation (SSADT) methods may be applied.
Original languageAmerican English
Number of pages10
StatePublished - 2011
EventSolarPACES 2011 - Granada, Spain
Duration: 20 Sep 201123 Sep 2011


ConferenceSolarPACES 2011
CityGranada, Spain

NREL Publication Number

  • NREL/CP-2C00-52624


  • service lifetime prediction
  • solar reflectors
  • step-stress accelerated degradation test (SSADT)
  • ultra-accelerated weathering system


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