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Heat Transfer and Pressure Drop Under Dry and Humid Conditions in Flat-Tube Heat Exchangers With Plain Fins

Stignor, Caroline Haglund; Sundén, Bengt LU ; Fahlen, Per and Stensson, Sofia (2010) In Heat Transfer Engineering 31(3). p.179-192
Abstract
Flat-tube heat exchangers could be an interesting alternative to make indirect cooling of display cabinets more energy-efficient. This application involves low air velocities in combination with condensation of water vapor on the air side, so plain fins could be suitable. Two different heat exchangers having flat tubes and plain fins on the air side were evaluated experimentally. One of the heat exchangers had continuous plate fins, and the other had serpentine fins. The performances during dry and wet test conditions were compared and related to theoretical predictions for different assumptions. The influence of air velocity, air humidity, and inclination angle was investigated. The results show that, in most cases, the heat transfer... (More)
Flat-tube heat exchangers could be an interesting alternative to make indirect cooling of display cabinets more energy-efficient. This application involves low air velocities in combination with condensation of water vapor on the air side, so plain fins could be suitable. Two different heat exchangers having flat tubes and plain fins on the air side were evaluated experimentally. One of the heat exchangers had continuous plate fins, and the other had serpentine fins. The performances during dry and wet test conditions were compared and related to theoretical predictions for different assumptions. The influence of air velocity, air humidity, and inclination angle was investigated. The results show that, in most cases, the heat transfer performance is somewhat reduced under wet conditions in comparison with dry test conditions, and that wet heat transfer surfaces lead to an increased pressure drop. At the lower air velocity range that was investigated, the heat exchanger having continuous plate fins drained better than the one with serpentine fins. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Heat Transfer Engineering
volume
31
issue
3
pages
179 - 192
publisher
Taylor & Francis
external identifiers
  • wos:000274915900003
  • scopus:70449360432
ISSN
1521-0537
DOI
10.1080/01457630903304350
language
English
LU publication?
yes
id
17c23230-d24c-4985-89ef-cfd4d87c9d0e (old id 1568217)
date added to LUP
2010-03-24 09:44:08
date last changed
2018-05-29 10:44:18
@article{17c23230-d24c-4985-89ef-cfd4d87c9d0e,
  abstract     = {Flat-tube heat exchangers could be an interesting alternative to make indirect cooling of display cabinets more energy-efficient. This application involves low air velocities in combination with condensation of water vapor on the air side, so plain fins could be suitable. Two different heat exchangers having flat tubes and plain fins on the air side were evaluated experimentally. One of the heat exchangers had continuous plate fins, and the other had serpentine fins. The performances during dry and wet test conditions were compared and related to theoretical predictions for different assumptions. The influence of air velocity, air humidity, and inclination angle was investigated. The results show that, in most cases, the heat transfer performance is somewhat reduced under wet conditions in comparison with dry test conditions, and that wet heat transfer surfaces lead to an increased pressure drop. At the lower air velocity range that was investigated, the heat exchanger having continuous plate fins drained better than the one with serpentine fins.},
  author       = {Stignor, Caroline Haglund and Sundén, Bengt and Fahlen, Per and Stensson, Sofia},
  issn         = {1521-0537},
  language     = {eng},
  number       = {3},
  pages        = {179--192},
  publisher    = {Taylor & Francis},
  series       = {Heat Transfer Engineering},
  title        = {Heat Transfer and Pressure Drop Under Dry and Humid Conditions in Flat-Tube Heat Exchangers With Plain Fins},
  url          = {http://dx.doi.org/10.1080/01457630903304350},
  volume       = {31},
  year         = {2010},
}