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RESEARCH PAPERS: Phase Change and Multiphase Heat Transfer

Condensing and Evaporating Heat Transfer and Pressure Drop Characteristics of HFC-134a and HCFC-22

[+] Author and Article Information
X. Liu

Carrier Corporation, United Technologies, P.O. Box 4803, 6500 Chrysler Drive, Syracuse, NY 13221

J. Heat Transfer 119(1), 158-163 (Feb 01, 1997) (6 pages) doi:10.1115/1.2824081 History: Received February 10, 1996; Revised October 17, 1996; Online December 05, 2007

Abstract

Condensing and evaporating heat transfer and pressure drop characteristics of an ozone friendly refrigerant HFC-134a and a HCFC refrigerant R-22, flowing inside a 9.5 mm (3/8 in) OD axially grooved tube were investigated experimentally to obtain the quasi-local heat transfer data and the correlations. When compared to R-22 at the same refrigerant flow rate, the condensing heat transfer coefficients for R-134a are 8 percent to 18 percent higher, and the pressure drop is 50 percent higher. The evaporating heat transfer coefficient with R-134a is about the same for mass velocity below 270 kg/m2 -s and decreases above that velocity, relative to R-22. Performance characteristics are compared with data from literature reports.

Copyright © 1997 by The American Society of Mechanical Engineers
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