Measurement of radiation distribution on the absorber in an asymmetric CPC collector
(2004) In Solar Energy 76(1-3). p.199-206- Abstract
- A method to estimate the annual collected energy and the annual average optical efficiency factor is suggested. The radiation distribution on the absorber of an asymmetric CPC collector with a flat bi-facial absorber is measured for three different absorber mounting angles using a photo diode. The annual optical efficiency factors and a relative measure of the annual collected energy are determined for collectors with the absorber fin thickness 0.5 and 1 mm, and for a collector with a teflon convection suppression film mounted around the absorber. With the local optical efficiency factors and the annual incident solar energy distribution considered, the analysis indicates that the energy gain for a mounting angle of 20 is higher than for a... (More)
- A method to estimate the annual collected energy and the annual average optical efficiency factor is suggested. The radiation distribution on the absorber of an asymmetric CPC collector with a flat bi-facial absorber is measured for three different absorber mounting angles using a photo diode. The annual optical efficiency factors and a relative measure of the annual collected energy are determined for collectors with the absorber fin thickness 0.5 and 1 mm, and for a collector with a teflon convection suppression film mounted around the absorber. With the local optical efficiency factors and the annual incident solar energy distribution considered, the analysis indicates that the energy gain for a mounting angle of 20 is higher than for a collector with 65 absorber mounting angle. The annual collected energy is increased with 6-8% if the absorber fin thickness is increased from 0.5 to 1 mm. The annual average optical efficiency factor is relatively independent of the absorber mounting angle. It was found to be 0.87-0.88 for a collector with a 0.5 mm thick absorber fin and 0.92 for a collector with a 1 mm thick absorber fin or for a collector with 0.5 mm thick absorber fin with a teflon convection suppression film added. The low annual average optical efficiency factor is not caused by the uneven irradiance distribution but by the relatively high U-L-values. (C) 2003 Elsevier Ltd. All rights reserved. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/288902
- author
- Adsten, M ; Hellström, Bengt LU and Karlsson, B
- organization
- publishing date
- 2004
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Solar Energy
- volume
- 76
- issue
- 1-3
- pages
- 199 - 206
- publisher
- Elsevier
- external identifiers
-
- wos:000188391600027
- scopus:0347051719
- ISSN
- 0038-092X
- DOI
- 10.1016/j.solener.2003.08.024
- language
- English
- LU publication?
- yes
- id
- 87af9f1b-e5ae-49fb-860b-bd91a1544ffd (old id 288902)
- date added to LUP
- 2016-04-01 15:18:38
- date last changed
- 2022-02-12 07:22:37
@article{87af9f1b-e5ae-49fb-860b-bd91a1544ffd,
abstract = {{A method to estimate the annual collected energy and the annual average optical efficiency factor is suggested. The radiation distribution on the absorber of an asymmetric CPC collector with a flat bi-facial absorber is measured for three different absorber mounting angles using a photo diode. The annual optical efficiency factors and a relative measure of the annual collected energy are determined for collectors with the absorber fin thickness 0.5 and 1 mm, and for a collector with a teflon convection suppression film mounted around the absorber. With the local optical efficiency factors and the annual incident solar energy distribution considered, the analysis indicates that the energy gain for a mounting angle of 20 is higher than for a collector with 65 absorber mounting angle. The annual collected energy is increased with 6-8% if the absorber fin thickness is increased from 0.5 to 1 mm. The annual average optical efficiency factor is relatively independent of the absorber mounting angle. It was found to be 0.87-0.88 for a collector with a 0.5 mm thick absorber fin and 0.92 for a collector with a 1 mm thick absorber fin or for a collector with 0.5 mm thick absorber fin with a teflon convection suppression film added. The low annual average optical efficiency factor is not caused by the uneven irradiance distribution but by the relatively high U-L-values. (C) 2003 Elsevier Ltd. All rights reserved.}},
author = {{Adsten, M and Hellström, Bengt and Karlsson, B}},
issn = {{0038-092X}},
language = {{eng}},
number = {{1-3}},
pages = {{199--206}},
publisher = {{Elsevier}},
series = {{Solar Energy}},
title = {{Measurement of radiation distribution on the absorber in an asymmetric CPC collector}},
url = {{http://dx.doi.org/10.1016/j.solener.2003.08.024}},
doi = {{10.1016/j.solener.2003.08.024}},
volume = {{76}},
year = {{2004}},
}