Journal
INTERNATIONAL JOURNAL OF REFRIGERATION
Volume 36, Issue 8, Pages 2366-2378Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrefrig.2013.07.009
Keywords
Flow boiling; Heat transfer; Pressure drop; Microfin tube; Non-Zeotropic mixture; GWP
Categories
Funding
- New Energy and Industrial Technology Development Organization (NEDO)
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Flow boiling of a potential refrigerant R32/R1234ze(E) in a horizontal microfin tube of 5.21 mm inner diameter is experimentally investigated. The heat transfer coefficient (HTC) and pressure drop are measured at a saturation temperature of 10 degrees C, heat fluxes of 10 and 15 kW m(-2), and mass velocities from 150 to 400 kg m(-2) s(-1). The HTC of R1234ze(E) is lower than that of R32. Degradation in the HTC of the R32/R1234ze(E) mixture is significant; the HTC is even lower than that of R1234ze(E). The HTC is minimized at the composition 0.2/0.8 by mass, where the temperature glide and the mass fraction distribution are maximized. A predicting correlation based on Momoki et al. (1995) associated with the correction methods of Thome (1981) to consider the mass transfer resistance and Stephan (1992) to consider the additionally required sensible heat is proposed and validated with the experimental results. (C) 2013 Elsevier Ltd and IIR. All rights reserved.
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