Journal
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
Volume 36, Issue 2, Pages 478-491Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrefrig.2012.07.016
Keywords
R-1234ze(E); R134a; Flow boiling; Heat transfer coefficients; Adiabatic pressure drops; Flow regimes; Predictive methods
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This paper presents experimental results for local heat transfer coefficients, adiabatic frictional pressure gradients and two-phase flow regimes with the low-GWP refrigerant R-1234ze(E), compared to Hydro-Fluoro-Carbon refrigerant R-134a in the same conditions. In particular the results refer to an experimental investigation carried out in a circular smooth tube of 6.00 mm of inner diameter, for saturation temperatures between -2.9 degrees C and 12.1 degrees C, mass fluxes between 146 and 520 kg m(-2) s(-1) and heat fluxes between 5.0 and 20.4 kW m(-2). These experimental results are compared to those for R-134a at the same operating conditions. Moreover, an assessment of predictive methods is provided for local heat transfer coefficients and frictional pressure gradients; also a direct comparison of flow regimes visualizations for R-1234ze(E) with a flow pattern map available in literature is presented. (C) 2012 Elsevier Ltd and IIR. All rights reserved.
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