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Flow boiling of R1234yf in a uniform smooth vertical minichannel
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-9902-2087
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
2013 (English)In: Science et Technique du Froid. Comptes Rendus/Refrigeration Science and Technology. Proceedings, 2013, Vol. 3, Institut International du Froid , 2013, 1-11 p.Conference paper, Published paper (Refereed)
Abstract [en]

This study describes experimental findings on flow boiling heat transfer with R1234yf in a smooth, vertical stainless steel tube of 1.6 mm inner diameter and 245 mm heated length. Tests were conducted at two saturation pressures corresponding to saturation temperatures of 27 and 32 °C. Other operating parameters were: mass flux 100-500 kg/m²s with heat flux 3-65 kW/m² while quality change was up to 60%. The heat transfer coefficient appeared to be a strong function of the applied heat flux and insignificant effect of mass flux and quality was observed. Increase in saturation temperature/pressure increased the heat transfer performance. Experiments were repeated with R134a in the same test section to compare the two fluids, almost similar results were duplicated with R134a. Experimental results were compared with different correlations, Tran et al. (1996), Gungor and Winterton (1986) and Martín-Callizo et al. (2007) correlations accurately predicted the data.

Place, publisher, year, edition, pages
Institut International du Froid , 2013. 1-11 p.
Series
Science et Technique du Froid, ISSN 0151-1637
Keyword [en]
R1234yf, Minichannel, Correlation
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-129518ISBN: 978-2-913149-99-1 (print)OAI: oai:DiVA.org:kth-129518DiVA: diva2:652637
Conference
4th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants, Delft, NL, Jun 17-19, 2013
Note

QC 20140611

Available from: 2013-10-01 Created: 2013-10-01 Last updated: 2014-06-11Bibliographically approved

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Palm, Björn

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