Experimental two-phase heat transfer coefficient and frictional pressure drop inside mini-channels during condensation with R1234yf and R134a

The present paper reports condensing two-phase flow pressure drop gradient and heat transfer coefficient (HTC) inside a mini-channel multiport tube with R1234yf and R134a. Several models available in the literature are used to compare predictions of these two fluids. Experimental data are analysed t...

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Bibliographic Details
Published in:International journal of refrigeration 2015-03, Vol.51, p.12-23
Main Authors: Illán-Gómez, F., López-Belchí, A., García-Cascales, J.R., Vera-García, F.
Format: Article
Language:English
Subjects:
Coefficient de transfert de chaleur
Condensation d'écoulement diphasique
Frictional pressure gradient
Gradient de la pression de frottement
HTC
Minicanaux
Minichannels
Two phase flow condensation
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Summary:The present paper reports condensing two-phase flow pressure drop gradient and heat transfer coefficient (HTC) inside a mini-channel multiport tube with R1234yf and R134a. Several models available in the literature are used to compare predictions of these two fluids. Experimental data are analysed to get the influence of saturation temperature, mass flux, vapour quality and fluid properties. HTC values of R1234yf seem to be lower than R134a under similar conditions. Two-phase flow pressure drops are also lower in the case of the new refrigerant R1234yf. •Study of pressure drop and HTC during condensation of R1234yf and R134a in mini-channel.•Experimental data analysis suggests that R134a has higher HTC than R1234yf.•A readjusted HTC model has been proposed.•Pressure drop for R1234yf is by 5–7% lower than for R134a.•The existing models are able to predict frictional pressure drop reasonably well.
ISSN:0140-7007
1879-2081
DOI:10.1016/j.ijrefrig.2014.11.014