The impact of optical and thermal properties on the performance of flat plate solar collectors
(2003) In Renewable Energy 28(3). p.331-344- Abstract
- The impact of the optical properties on the annual performance of flat plate collectors in a Swedish climate has been estimated with the MINSUN program. The collector parameters were determined with a theoretically based calculation program verified from laboratory measurements. The importance of changes in solar absorptance and thermal emittance of the absorber, the addition of a teflon film or a teflon honeycomb, antireflection treatment of the, cover glazing and combinations of these improvements were investigated. The results show that several improvements can be achieved for solar thermal absorbers. A combined increase in absorptance from 0.95 to 0.97 and a decrease in emittance from 0.10 to 0.05 increase the annual performance with... (More)
- The impact of the optical properties on the annual performance of flat plate collectors in a Swedish climate has been estimated with the MINSUN program. The collector parameters were determined with a theoretically based calculation program verified from laboratory measurements. The importance of changes in solar absorptance and thermal emittance of the absorber, the addition of a teflon film or a teflon honeycomb, antireflection treatment of the, cover glazing and combinations of these improvements were investigated. The results show that several improvements can be achieved for solar thermal absorbers. A combined increase in absorptance from 0.95 to 0.97 and a decrease in emittance from 0.10 to 0.05 increase the annual performance with 6.7% at 50 degreesC operating temperature. The increase in performance by installing a teflon film as second glazing was estimated to 5.6% at 50 degreesC. If instead a teflon honeycomb is installed, a twice as high performance increase is obtained, 12.1 %. Antireflection treatment of the cover glazing increases the annual output with 6.5% at 50 degreesC. A combination of absorber improvements together with a teflon honeycomb and an antireflection treated glazing results in a total increase of 24.6% at 50 degreesC. Including external booster reflectors increases the expected annual output at 50 degreesC to 19.9-29.4% depending on reflector material. (C) 2002 Elsevier Science Ltd. All rights reserved. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/325139
- author
- Hellström, Bengt LU ; Adsten, M ; Nostell, P ; Karlsson, Björn LU and Wackelgard, E
- organization
- publishing date
- 2003
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- booster reflector, solar absorber, antireflection treatment, teflon, solar thermal collector, materials
- in
- Renewable Energy
- volume
- 28
- issue
- 3
- pages
- 331 - 344
- publisher
- Elsevier
- external identifiers
-
- wos:000178596100001
- scopus:0036489471
- ISSN
- 0960-1481
- DOI
- 10.1016/S0960-1481(02)00040-X
- language
- English
- LU publication?
- yes
- id
- df0662ff-8dc8-4ac2-8f59-af06c72d4378 (old id 325139)
- date added to LUP
- 2016-04-01 11:58:03
- date last changed
- 2022-01-26 20:54:59
@article{df0662ff-8dc8-4ac2-8f59-af06c72d4378,
abstract = {{The impact of the optical properties on the annual performance of flat plate collectors in a Swedish climate has been estimated with the MINSUN program. The collector parameters were determined with a theoretically based calculation program verified from laboratory measurements. The importance of changes in solar absorptance and thermal emittance of the absorber, the addition of a teflon film or a teflon honeycomb, antireflection treatment of the, cover glazing and combinations of these improvements were investigated. The results show that several improvements can be achieved for solar thermal absorbers. A combined increase in absorptance from 0.95 to 0.97 and a decrease in emittance from 0.10 to 0.05 increase the annual performance with 6.7% at 50 degreesC operating temperature. The increase in performance by installing a teflon film as second glazing was estimated to 5.6% at 50 degreesC. If instead a teflon honeycomb is installed, a twice as high performance increase is obtained, 12.1 %. Antireflection treatment of the cover glazing increases the annual output with 6.5% at 50 degreesC. A combination of absorber improvements together with a teflon honeycomb and an antireflection treated glazing results in a total increase of 24.6% at 50 degreesC. Including external booster reflectors increases the expected annual output at 50 degreesC to 19.9-29.4% depending on reflector material. (C) 2002 Elsevier Science Ltd. All rights reserved.}},
author = {{Hellström, Bengt and Adsten, M and Nostell, P and Karlsson, Björn and Wackelgard, E}},
issn = {{0960-1481}},
keywords = {{booster reflector; solar absorber; antireflection treatment; teflon; solar thermal collector; materials}},
language = {{eng}},
number = {{3}},
pages = {{331--344}},
publisher = {{Elsevier}},
series = {{Renewable Energy}},
title = {{The impact of optical and thermal properties on the performance of flat plate solar collectors}},
url = {{http://dx.doi.org/10.1016/S0960-1481(02)00040-X}},
doi = {{10.1016/S0960-1481(02)00040-X}},
volume = {{28}},
year = {{2003}},
}