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Dryout characteristics of natural and synthetic refrigerants in single vertical mini-channels
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.
2015 (English)In: Experimental Thermal and Fluid Science, ISSN 0894-1777, E-ISSN 1879-2286, Vol. 68, 257-267 p.Article in journal (Refereed) Published
Abstract [en]

Experimental results on dryout of seven refrigerants (R134a, R1234yf, R152a, R22, R245fa, R290 and R600a) in small, single vertical tubes under upward flow conditions are reported in this study. The experiments were conducted under a wide range of operating conditions in stainless steel tubes (0.64-1.70. mm and 213-245. mm heated length). The effects of operating parameters like mass flux, vapor quality, saturation pressure and channel size are discussed in detail. In general, dryout heat flux increased with increasing mass flux, and with increasing tube diameter. No effect of varying saturation temperature was observed. The experimental findings were compared with well-known macro and micro-scale correlations from the literature and it was found that Wu's correlation (in modified form) quite satisfactorily predicted the whole database. A new correlation for prediction of heat flux at dryout conditions is also proposed.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 68, 257-267 p.
Keyword [en]
Correlation, Dryout, Mini-channel, R1234yf, R134a, R152a, R22, R245fa, R290, R600a
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-170188DOI: 10.1016/j.expthermflusci.2015.04.016ISI: 000365361800025Scopus ID: 2-s2.0-84930202428OAI: oai:DiVA.org:kth-170188DiVA: diva2:827654
Note

QC 20150629

Available from: 2015-06-29 Created: 2015-06-29 Last updated: 2017-12-04Bibliographically approved

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Palm, Björn E.

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