Condensing and Evaporating Heat Transfer and Pressure Drop Characteristics of HFC-134a and HCFC-22-Reference-Cited by-同舟云学术

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

Published:1997-02-01 Issue:1 Volume:119 Page:158-163
ISSN:0022-1481
Container-title:Journal of Heat Transfer
language:en
Short-container-title:

Author:

Liu X.¹

Affiliation:

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

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.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Link

http://asmedigitalcollection.asme.org/heattransfer/article-pdf/119/1/158/5507755/158_1.pdf

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