Heat transfer coefficients during condensation of zeotropic refrigerant mixtures were obtained at mass fractions of 90 percent/10 percent, 80 percent/20 percent, 70 percent/30 percent, 60 percent/40 percent, and 50 percent/50 percent for HCFC-22/HCFC-142b and for pure HCFC-22 in a horizontal smooth tube at a high saturation pressure of 2.43 MPa. The measurements were taken in a series of eight 8.11 mm inner diameter smooth tubes with lengths of 1 603 mm. At low mass fluxes, from 40 kg/m2s to 350 kg/m2s where the flow regime is predominately stratified wavy, the refrigerant mass fraction influenced the heat transfer coefficient by up to a factor of two, decreasing as the mass fraction of HCFC-142b is increased. At high mass fluxes of 350 kg/m2s and more, the flow regime was predominately annular and the heat transfer coefficients were not strongly influenced by the refrigerant mass fraction, decreasing only by 7 percent as the refrigerant mass fraction changed from 100 percent HCFC-22 to 50 percent/50 percent HCFC-22/HCFC-142b. The results also indicated that of three methods tested to predict heat transfer coefficients, the flow pattern correlation of Dobson and Chato (1998) gave the best results for pure HCFC-22 and for the mixtures utilizing the Silver-Bell-Ghaly method (1964).
Skip Nav Destination
Article navigation
Technical Papers
Heat Transfer Coefficients During Condensation of the Zeotropic Refrigerant Mixture HCFC-22/HCFC-142b
F. J. Smit, Ph.D. student,
F. J. Smit, Ph.D. student
Rand Afrikaans University, Mechanical Engineering, PO Box 524 Auckland Park, 2006, Johannesburg, South Africa
Search for other works by this author on:
J. R. Thome, Mem. ASME, Professor,
J. R. Thome, Mem. ASME, Professor
Swiss Federal Institute of Technology Lausanne, Laboratory of Heat and Mass Transfer, CH-1015 Lausanne, Switzerland
Search for other works by this author on:
J. P. Meyer, Mem. ASME, Professor
J. P. Meyer, Mem. ASME, Professor
University of Pretoria, Mechanical and Aeronautical Engineering, Pretoria, 0002, South Africa
Search for other works by this author on:
F. J. Smit, Ph.D. student
Rand Afrikaans University, Mechanical Engineering, PO Box 524 Auckland Park, 2006, Johannesburg, South Africa
J. R. Thome, Mem. ASME, Professor
Swiss Federal Institute of Technology Lausanne, Laboratory of Heat and Mass Transfer, CH-1015 Lausanne, Switzerland
J. P. Meyer, Mem. ASME, Professor
University of Pretoria, Mechanical and Aeronautical Engineering, Pretoria, 0002, South Africa
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division January 25, 2000; revision April 3, 2002. Associate Editor: S. S. Sadhal.
J. Heat Transfer. Dec 2002, 124(6): 1137-1146 (10 pages)
Published Online: December 3, 2002
Article history
Received:
January 25, 2000
Revised:
April 3, 2002
Online:
December 3, 2002
Citation
Smit, F. J., Thome, J. R., and Meyer, J. P. (December 3, 2002). "Heat Transfer Coefficients During Condensation of the Zeotropic Refrigerant Mixture HCFC-22/HCFC-142b ." ASME. J. Heat Transfer. December 2002; 124(6): 1137–1146. https://doi.org/10.1115/1.1484108
Download citation file:
Get Email Alerts
Cited By
Related Articles
Effect of Fin Geometry on Condensation of R407C in a Staggered Bundle of Horizontal Finned Tubes
J. Heat Transfer (August,2003)
Condensation of Zeotropic Mixtures in Horizontal Tubes: New Simplified Heat Transfer Model Based on Flow Regimes
J. Heat Transfer (March,2005)
Measurement of Condensation Heat Transfer Coefficients at Near-Critical Pressures in Refrigerant Blends
J. Heat Transfer (August,2007)
Measurement and Modeling of Condensation Heat Transfer Coefficients in Circular Microchannels
J. Heat Transfer (October,2006)
Related Proceedings Papers
Related Chapters
Introduction
Two-Phase Heat Transfer
Condensation in Cool Roofs—Code Challenges, Field Observations, and Hygrothermal Modeling
Roofing Research and Standards Development: 10th Volume
Evaluation of Moisture Accumulation in Composite Roof Decks in High Humidity Environments such as Natatoriums in Cold Climates Using Hygrothermal Modeling
Roofing Research and Standards Development: 10th Volume