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Analysis of the effects of outdoor and accelerated ageing on the optical properties of reflector materials for solar energy applications

Brogren, M; Karlsson, Björn LU ; Roos, A and Werner, A (2004) In Solar Energy Materials and Solar Cells 82(4). p.491-515
Abstract
Lifetime tests of solar reflector materials are eligible prior to application, to prove the stability of the optical properties. In this work, six reflector materials were aged outdoors and in a climatic test chamber. The surfaces of the samples were inspected using profilometry and optical microscopy. The total and specular reflectance spectra were measured using spectrophotometry and the weighted solar reflectance values were calculated before and after ageing. Reflectors of silvered glass, anodised aluminium, thin film-coated anodised aluminium, and lacquered rolled aluminium withstood accelerated testing well, while a laminated evaporated aluminium reflector, which was specular initially, became diffuse. Laminated and lacquered... (More)
Lifetime tests of solar reflector materials are eligible prior to application, to prove the stability of the optical properties. In this work, six reflector materials were aged outdoors and in a climatic test chamber. The surfaces of the samples were inspected using profilometry and optical microscopy. The total and specular reflectance spectra were measured using spectrophotometry and the weighted solar reflectance values were calculated before and after ageing. Reflectors of silvered glass, anodised aluminium, thin film-coated anodised aluminium, and lacquered rolled aluminium withstood accelerated testing well, while a laminated evaporated aluminium reflector, which was specular initially, became diffuse. Laminated and lacquered reflectors withstood outdoor ageing better than expected from accelerated ageing and better than unprotected thin film-coated and anodised aluminium, which degraded significantly outdoors. Thus, optical degradation depends on climatic conditions and on the protective layer, if applicable. The discrepancy between results from outdoor and accelerated ageing shows that a thorough understanding of corrosion processes is necessary for drawing conclusions about long-term performance from accelerated ageing tests. (C) 2004 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
ageing, outdoor, accelerated ageing, reflector materials, optical properties, long-term, durability
in
Solar Energy Materials and Solar Cells
volume
82
issue
4
pages
491 - 515
publisher
Elsevier
external identifiers
  • wos:000221728700002
  • scopus:2342630566
ISSN
0927-0248
DOI
10.1016/j.solmat.2004.02.011
language
English
LU publication?
yes
id
4bc99f1d-97fb-43a0-b116-848012b7c3d0 (old id 276822)
date added to LUP
2007-08-02 11:07:50
date last changed
2017-10-29 04:19:08
@article{4bc99f1d-97fb-43a0-b116-848012b7c3d0,
  abstract     = {Lifetime tests of solar reflector materials are eligible prior to application, to prove the stability of the optical properties. In this work, six reflector materials were aged outdoors and in a climatic test chamber. The surfaces of the samples were inspected using profilometry and optical microscopy. The total and specular reflectance spectra were measured using spectrophotometry and the weighted solar reflectance values were calculated before and after ageing. Reflectors of silvered glass, anodised aluminium, thin film-coated anodised aluminium, and lacquered rolled aluminium withstood accelerated testing well, while a laminated evaporated aluminium reflector, which was specular initially, became diffuse. Laminated and lacquered reflectors withstood outdoor ageing better than expected from accelerated ageing and better than unprotected thin film-coated and anodised aluminium, which degraded significantly outdoors. Thus, optical degradation depends on climatic conditions and on the protective layer, if applicable. The discrepancy between results from outdoor and accelerated ageing shows that a thorough understanding of corrosion processes is necessary for drawing conclusions about long-term performance from accelerated ageing tests. (C) 2004 Elsevier B.V. All rights reserved.},
  author       = {Brogren, M and Karlsson, Björn and Roos, A and Werner, A},
  issn         = {0927-0248},
  keyword      = {ageing,outdoor,accelerated ageing,reflector materials,optical properties,long-term,durability},
  language     = {eng},
  number       = {4},
  pages        = {491--515},
  publisher    = {Elsevier},
  series       = {Solar Energy Materials and Solar Cells},
  title        = {Analysis of the effects of outdoor and accelerated ageing on the optical properties of reflector materials for solar energy applications},
  url          = {http://dx.doi.org/10.1016/j.solmat.2004.02.011},
  volume       = {82},
  year         = {2004},
}