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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Condensation Heat Transfer of a Non-Azeotropic Mixture in a Single Minichannel

Get access (open in a dialog) DOI: 10.1615/IHTC15.cds.010015
pages 713-724

Resumo

Much attention has been paid in the recent years to the possible use of fluorinated propene isomers for the substitution of high-GWP refrigerants. Among the fluorinated propene isomers, R1234ze(E) may be a substitute of R134a for refrigeration applications. R1234ze(E) has a GWP equal to 6 (considering a period time of 100 years), much lower than that of R134a. Unfortunately, R1234ze(E) displays poorer heat transfer characteristics during condensation as compared to R134a. In this paper, to get better performance, a mixture of R1234ze(E) and R32 is under study at two mass compositions (23/77% and 46/54%). In particular the local heat transfer coefficient during condensation of this mixture in a single minichannel with 0.96 mm diameter is measured and analyzed. Tests are carried out with the experimental apparatus available at the Two Phase Heat Transfer Lab of the University of Padova. The new experimental data are compared to condensation data of pure R1234ze(E) and R32. This allows to analyze the heat transfer penalization due to the mass transfer resistance occurring during condensation of this zeotropic mixture and to assess available predicting models for condensation of zeotropic mixtures. It is worth mentioning here that very limited data of mixture condensation in minichannel are available in the literature. Therefore, the present paper provides interesting information with regard to the applicability of available models in mini and microchannels.