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Micro-structured reflector surfaces for a stationary asymmetric parabolic solar concentrator

Nilsson, Johan LU ; Leutz, Ralf and Karlsson, Björn LU (2007) In Solar Energy Materials and Solar Cells 91(6). p.525-533
Abstract
One of the main problems in using parabolic concentrators with standard photovoltaics (PV) cells is the highly non-uniform illumination of the cells. The non-uniform irradiation causes high resistive losses in the standard cells due to their relatively high series resistance. This results in a considerably lowered efficiency. To solve the problem, we introduce three different structured reflectors that will create a more uniform illumination, and also increase the concentration ratio in certain cases. The structures were evaluated in an existing trough system by Monte Carlo ray tracing, and it was found that structures improve the system performance mainly by homogenizing the light on the cells. The yearly irradiation collected in the... (More)
One of the main problems in using parabolic concentrators with standard photovoltaics (PV) cells is the highly non-uniform illumination of the cells. The non-uniform irradiation causes high resistive losses in the standard cells due to their relatively high series resistance. This results in a considerably lowered efficiency. To solve the problem, we introduce three different structured reflectors that will create a more uniform illumination, and also increase the concentration ratio in certain cases. The structures were evaluated in an existing trough system by Monte Carlo ray tracing, and it was found that structures improve the system performance mainly by homogenizing the light on the cells. The yearly irradiation collected in the evaluation system is slightly lower than for a reference with smooth reflectors, but the more uniform illumination of the cells will generate a net increase of the total system performance compared to a system that was optimized with smooth reflectors. The benefit of the increased concentration ratio is increased flexibility in designing new systems with concentration ratios surpassing the limit of existing trough concentrators. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
design, optical, structured reflectors, solar concentrators, photovoltaics
in
Solar Energy Materials and Solar Cells
volume
91
issue
6
pages
525 - 533
publisher
Elsevier
external identifiers
  • wos:000244997900010
  • scopus:33847391113
ISSN
0927-0248
DOI
10.1016/j.solmat.2006.11.003
language
English
LU publication?
yes
id
2bd39f9b-36a1-4dca-9d8f-c0d230c18c24 (old id 670010)
date added to LUP
2007-12-14 16:29:02
date last changed
2017-01-08 05:11:21
@article{2bd39f9b-36a1-4dca-9d8f-c0d230c18c24,
  abstract     = {One of the main problems in using parabolic concentrators with standard photovoltaics (PV) cells is the highly non-uniform illumination of the cells. The non-uniform irradiation causes high resistive losses in the standard cells due to their relatively high series resistance. This results in a considerably lowered efficiency. To solve the problem, we introduce three different structured reflectors that will create a more uniform illumination, and also increase the concentration ratio in certain cases. The structures were evaluated in an existing trough system by Monte Carlo ray tracing, and it was found that structures improve the system performance mainly by homogenizing the light on the cells. The yearly irradiation collected in the evaluation system is slightly lower than for a reference with smooth reflectors, but the more uniform illumination of the cells will generate a net increase of the total system performance compared to a system that was optimized with smooth reflectors. The benefit of the increased concentration ratio is increased flexibility in designing new systems with concentration ratios surpassing the limit of existing trough concentrators.},
  author       = {Nilsson, Johan and Leutz, Ralf and Karlsson, Björn},
  issn         = {0927-0248},
  keyword      = {design,optical,structured reflectors,solar concentrators,photovoltaics},
  language     = {eng},
  number       = {6},
  pages        = {525--533},
  publisher    = {Elsevier},
  series       = {Solar Energy Materials and Solar Cells},
  title        = {Micro-structured reflector surfaces for a stationary asymmetric parabolic solar concentrator},
  url          = {http://dx.doi.org/10.1016/j.solmat.2006.11.003},
  volume       = {91},
  year         = {2007},
}