Condensation of a Nonazeotropic Refrigerant Mixture R114/R113 in Horizontal Annuli With an Enhanced Inner Tube

[+] Author and Article Information
Sh. Nozu, K. Ozaki, H. Inaba

Department of Mechanical Engineering, Okayama University, 3-1 Tsushima, Okayama 700, Japan

H. Honda

Institute of Advanced Material Study, Kyushu University, Kasuga, Fukuoka 816, Japan

J. Heat Transfer 114(1), 201-210 (Feb 01, 1992) (10 pages) doi:10.1115/1.2911247 History: Received November 26, 1990; Revised May 23, 1991; Online May 23, 2008


Local heat transfer and pressure drop measurements are made during condensation of a nonazeotropic refrigerant mixture R114/R113 in the annuli of horizontal double-tube condensers. The inner tube is a 19.1-mm-o.d. corrugated tube with copper wire fins soldered on the outer surface. The outer tubes are smooth tubes with different i.d. of 29.9 and 25.0 mm. The heat transfer coefficient based on the bulk-vapor to wall temperature difference is considerably smaller for R114/R113 mixtures than for pure R113. An empirical equation for the vapor phase mass transfer coefficient is derived, in which the dimensionless parameters are introduced on the basis of the previous results for turbulent single phase flow in smooth and rough tubes with and without surface suction. The measured condensation heat transfer coefficients for R114/R113 mixtures are correlated by the present model to a mean absolute deviation of 14.3 percent.

Copyright © 1992 by The American Society of Mechanical Engineers
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