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Liquid side heat transfer and pressure drop in finned-tube cooling-coils operated with secondary refrigerants

Haglund Stignor, Caroline LU ; Sundén, Bengt LU and Fahlen, Per (2007) In International Journal of Refrigeration 30(7). p.1278-1289
Abstract
In this study full-scale experiments with two different conventional cooling-coils aimed for display cabinets were performed. Heat transfer and pressure drop on the liquid side for three different single phase secondary refrigerants were studied and compared to predictions by existing correlations. Predominantly, the laminar flow regime was studied. The results show that when predicting the heat transfer performance on the liquid side of a cooling-coil the Gnielinski correlation for thermally developing flow and uniform wall temperature boundary conditions (T) leads to good agreement for 0.0014<x*<0.017 if 50 < Re < 1700, assuming a new entrance length is formed after each U-bend. In addition, these entrance lengths must also... (More)
In this study full-scale experiments with two different conventional cooling-coils aimed for display cabinets were performed. Heat transfer and pressure drop on the liquid side for three different single phase secondary refrigerants were studied and compared to predictions by existing correlations. Predominantly, the laminar flow regime was studied. The results show that when predicting the heat transfer performance on the liquid side of a cooling-coil the Gnielinski correlation for thermally developing flow and uniform wall temperature boundary conditions (T) leads to good agreement for 0.0014<x*<0.017 if 50 < Re < 1700, assuming a new entrance length is formed after each U-bend. In addition, these entrance lengths must also be accounted for, when predicting the pressure drop on the liquid side of the cooling-coil. The uncertainty of measurement can be a problem in this type of investigations and this has been taken into consideration when analysing the results. (C) 2007 Elsevier Ltd and IIR. Ail rights reserved. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
secondary refrigerant, pressure drop, heat transfer, experiment, finned tube, heat exchanger, refrigeration, display cabinet, propylene glycol, laminar flow
in
International Journal of Refrigeration
volume
30
issue
7
pages
1278 - 1289
publisher
Elsevier
external identifiers
  • wos:000250149400016
  • scopus:34548481552
ISSN
0140-7007
DOI
10.1016/j.ijrefrig.2007.02.007
language
English
LU publication?
yes
id
ef1c4264-ddd4-455f-9cd3-813f77ec1a11 (old id 654310)
alternative location
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V4R-4N49VN3-2&_user=745831&_coverDate=11%2F30%2F2007&_alid=695614625&_rdoc=2&_fmt=full&_orig=search&_cdi=5765&_sort=d&_docanchor=&view=c&_ct=17&_acct=C000041498&_version=1&_urlVersion=0&_userid=745831&md5=d257ced3e8a31651c7a17d7b239ce146
date added to LUP
2007-12-20 13:26:04
date last changed
2017-01-01 07:27:32
@article{ef1c4264-ddd4-455f-9cd3-813f77ec1a11,
  abstract     = {In this study full-scale experiments with two different conventional cooling-coils aimed for display cabinets were performed. Heat transfer and pressure drop on the liquid side for three different single phase secondary refrigerants were studied and compared to predictions by existing correlations. Predominantly, the laminar flow regime was studied. The results show that when predicting the heat transfer performance on the liquid side of a cooling-coil the Gnielinski correlation for thermally developing flow and uniform wall temperature boundary conditions (T) leads to good agreement for 0.0014&lt;x*&lt;0.017 if 50 &lt; Re &lt; 1700, assuming a new entrance length is formed after each U-bend. In addition, these entrance lengths must also be accounted for, when predicting the pressure drop on the liquid side of the cooling-coil. The uncertainty of measurement can be a problem in this type of investigations and this has been taken into consideration when analysing the results. (C) 2007 Elsevier Ltd and IIR. Ail rights reserved.},
  author       = {Haglund Stignor, Caroline and Sundén, Bengt and Fahlen, Per},
  issn         = {0140-7007},
  keyword      = {secondary refrigerant,pressure drop,heat transfer,experiment,finned tube,heat exchanger,refrigeration,display cabinet,propylene glycol,laminar flow},
  language     = {eng},
  number       = {7},
  pages        = {1278--1289},
  publisher    = {Elsevier},
  series       = {International Journal of Refrigeration},
  title        = {Liquid side heat transfer and pressure drop in finned-tube cooling-coils operated with secondary refrigerants},
  url          = {http://dx.doi.org/10.1016/j.ijrefrig.2007.02.007},
  volume       = {30},
  year         = {2007},
}