Liquid side heat transfer and pressure drop in finned-tube cooling-coils operated with secondary refrigerants
Författare
Summary, in English
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.
Avdelning/ar
Publiceringsår
2007
Språk
Engelska
Sidor
1278-1289
Publikation/Tidskrift/Serie
International Journal of Refrigeration
Volym
30
Issue
7
Länkar
- Publication in Lund University research portal
- 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
- http://dx.doi.org/10.1016/j.ijrefrig.2007.02.007
Dokumenttyp
Artikel i tidskrift
Förlag
Elsevier
Ämne
- Energy Engineering
Nyckelord
- secondary refrigerant
- pressure drop
- heat transfer
- experiment
- finned tube
- heat exchanger
- refrigeration
- display cabinet
- propylene glycol
- laminar flow
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0140-7007