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TECHNICAL PAPERS: Evaporation, Boiling, and Condensation

Heat Transfer Coefficients During Condensation of the Zeotropic Refrigerant Mixture HCFC-22/HCFC-142b

[+] Author and Article Information
F. J. Smit

Rand Afrikaans University, Mechanical Engineering, PO Box 524 Auckland Park, 2006, Johannesburg, South Africae-mail: jpm@ingl.rau.ac.za

J. R. Thome

Swiss Federal Institute of Technology Lausanne, Laboratory of Heat and Mass Transfer, CH-1015 Lausanne, Switzerlande-mail: john.thome@epfl.ch

J. P. Meyer

University of Pretoria, Mechanical and Aeronautical Engineering, Pretoria, 0002, South Africae-mail: jmeyer@up.ac.za

J. Heat Transfer 124(6), 1137-1146 (Dec 03, 2002) (10 pages) doi:10.1115/1.1484108 History: Received January 25, 2000; Revised April 03, 2002; Online December 03, 2002
Copyright © 2002 by ASME
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References

Figures

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Deviations for (a) average and (b) sectional HCFC-22 heat transfer coefficients between measurements and the Dobson and Chato 1 correlation
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Deviations for (a) average and (b) sectional HCFC-22/HCFC-142b (70 percent/30 percent by wt.) heat transfer coefficients and the Shah 25 correlation with Silver-Bell-Ghaly correction 2
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Heat transfer coefficients at a mass flux of 600 kg/m2 s (annular flow) at different mass fractions of HCFC-22/HCFC-142b
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Average heat transfer coefficients at a condensing temperature of 60°C at different mass fractions of HCFC-22/HCFC-142b
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Comparison of average heat transfer coefficients (measured from LMTD method) with average of heat transfer coefficients for HCFC-22
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Deviations for (a) average and (b) sectional HCFC-22 heat transfer coefficients between measurements and the Shah 25 correlation
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Deviations for (a) average and (b) sectional HCFC-22 heat transfer coefficients between measurements and the Cavallini and Zecchin 26 correlation
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Schematic of test facility
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Comparison to other literature of measured average heat transfer coefficients of HCFC-22 at condensing temperatures of 35°C and 40°C
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Comparison of sectional heat transfer coefficients of HCFC-22 at temperatures of 40°C and 60°C at a mass flux of 300 kg/m2 s
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Heat transfer coefficients at a mass flux of 100 kg/m2 s (stratified-wavy flow) at different mass fractions of HCFC-22/HCFC-142b
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Heat transfer coefficients at a mass flux of 300 kg/m2 s (mixed flow) at different mass fractions of HCFC-22/HCFC-142b
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Deviations for (a) average and (b) sectional HCFC-22/HCFC-142b (70 percent/30 percent by wt.) heat transfer coefficients and the Cavallini and Zecchin 26 correlation with Silver-Bell-Ghaly correction 2
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Deviations for (a) average and (b) sectional HCFC-22/HCFC-142b (70 percent/30 percent by wt.) heat transfer coefficients and the Dobson and Chato 1 correlation with Silver-Bell-Ghaly correction 2

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