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Reflector materials for two-dimensional low-concentrating photovoltaic systems: the effect of specular versus diffuse reflectance efficiency on the module

Hall, M; Roos, A and Karlsson, Björn LU (2005) In Progress in Photovoltaics 13(3). p.217-233
Abstract
Photovoltaic modules in two-dimensional low-concentrating systems with specular parabolic reflectors often experience high local irradiance that causes high local currents and cell temperatures. This generally results in power losses. The use of low-angle scattering reflectors gives a smoother irradiance distribution, which results in a higher fill factor. In order to study how the choice of reflector material influences system performance, two different reflector materials (anodised aluminium and lacquered rolled aluminium laminated on a plastic substrate) were compared. The total and diffuse reflectance spectra of the reflector materials were measured, the integrated hemispherical and specular solar reflectance values calculated, and the... (More)
Photovoltaic modules in two-dimensional low-concentrating systems with specular parabolic reflectors often experience high local irradiance that causes high local currents and cell temperatures. This generally results in power losses. The use of low-angle scattering reflectors gives a smoother irradiance distribution, which results in a higher fill factor. In order to study how the choice of reflector material influences system performance, two different reflector materials (anodised aluminium and lacquered rolled aluminium laminated on a plastic substrate) were compared. The total and diffuse reflectance spectra of the reflector materials were measured, the integrated hemispherical and specular solar reflectance values calculated, and the angular distributions of scattered light investigated. Two geometrically identical 3 x concentrating photovoltaic systems with semi-parabolic over edge reflectors of the different materials were tested outdoors. While the anodised aluminium reflector, which had higher hemispherical and specular solar reflectance, resulted in a higher short-circuit current, the low-angle scattering lacquered foil gave a higher fill factor, due to a smoother image of the sun on the module surface, and an equally high calculated annual electricity production. Given its low price, the latter reflector should thus be more cost-effective in low-concentrating photovoltaic systems. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
reflector laminate, aluminium, anodised, fill factor, low-angle scattering, optical properties, reflector materials, photovoltaic systems, parabolic concentrators
in
Progress in Photovoltaics
volume
13
issue
3
pages
217 - 233
publisher
John Wiley & Sons
external identifiers
  • wos:000228564200005
  • scopus:17444426660
ISSN
1099-159X
DOI
10.1002/pip.588
language
English
LU publication?
yes
id
1b496c22-ebe6-41a4-8337-9ffe8412db79 (old id 244625)
date added to LUP
2007-08-23 14:41:18
date last changed
2017-07-23 03:36:05
@article{1b496c22-ebe6-41a4-8337-9ffe8412db79,
  abstract     = {Photovoltaic modules in two-dimensional low-concentrating systems with specular parabolic reflectors often experience high local irradiance that causes high local currents and cell temperatures. This generally results in power losses. The use of low-angle scattering reflectors gives a smoother irradiance distribution, which results in a higher fill factor. In order to study how the choice of reflector material influences system performance, two different reflector materials (anodised aluminium and lacquered rolled aluminium laminated on a plastic substrate) were compared. The total and diffuse reflectance spectra of the reflector materials were measured, the integrated hemispherical and specular solar reflectance values calculated, and the angular distributions of scattered light investigated. Two geometrically identical 3 x concentrating photovoltaic systems with semi-parabolic over edge reflectors of the different materials were tested outdoors. While the anodised aluminium reflector, which had higher hemispherical and specular solar reflectance, resulted in a higher short-circuit current, the low-angle scattering lacquered foil gave a higher fill factor, due to a smoother image of the sun on the module surface, and an equally high calculated annual electricity production. Given its low price, the latter reflector should thus be more cost-effective in low-concentrating photovoltaic systems.},
  author       = {Hall, M and Roos, A and Karlsson, Björn},
  issn         = {1099-159X},
  keyword      = {reflector laminate,aluminium,anodised,fill factor,low-angle scattering,optical properties,reflector materials,photovoltaic systems,parabolic concentrators},
  language     = {eng},
  number       = {3},
  pages        = {217--233},
  publisher    = {John Wiley & Sons},
  series       = {Progress in Photovoltaics},
  title        = {Reflector materials for two-dimensional low-concentrating photovoltaic systems: the effect of specular versus diffuse reflectance efficiency on the module},
  url          = {http://dx.doi.org/10.1002/pip.588},
  volume       = {13},
  year         = {2005},
}