This paper presents heat transfer data for the condensation of at low temperatures in horizontal smooth and microfin tubes. The test tubes included a 3.48 mm inner diameter smooth tube and a 3.51 mm melt-down diameter microfin tube. The test was performed over a mass flux range of and at saturation temperatures of and , respectively. The effect of various parameters—diameter, mass flux, vapor quality, and temperature difference between inner wall and refrigerant—on heat transfer coefficient and enhancement factor is analyzed. The data are compared with several correlations. The existing correlations for the smooth tube mostly overpredicted the heat transfer coefficients of the present study, which is possibly resulted from the characteristics of carbon dioxide as a “high pressure refrigerant.” For the microfin tubes, due to the complexity and variety of fin geometry and flow mechanisms in microfin tubes, most of the correlations for the microfin tube were not applicable for the experimental data of the present study. The average enhancement factors and penalty factors evidenced that it was not always true that the internally finned geometry guaranteed the superior in-tube condensation performance of the microfin tube in refrigeration and air-conditioning systems.
Skip Nav Destination
e-mail: yoonjo.kim@me.gatech.edu
Article navigation
Research Papers
Condensation Heat Transfer of Carbon Dioxide Inside Horizontal Smooth and Microfin Tubes at Low Temperatures
Yoon Jo Kim,
Yoon Jo Kim
The George W. Woodruff School of Mechanical Engineering,
e-mail: yoonjo.kim@me.gatech.edu
Georgia Institute of Technology
, Atlanta, GA 30332
Search for other works by this author on:
Jeremy Jang,
Jeremy Jang
Department of Mechanical Science and Engineering,
University of Illinois at Urbana-Champaign
, Urbana, IL 61801
Search for other works by this author on:
Predrag S. Hrnjak,
Predrag S. Hrnjak
Department of Mechanical Science and Engineering,
University of Illinois at Urbana-Champaign
, Urbana, IL 61801
Search for other works by this author on:
Min Soo Kim
Min Soo Kim
School of Mechanical and Aerospace Engineering,
Seoul National University
, Seoul 151-742, Korea
Search for other works by this author on:
Yoon Jo Kim
The George W. Woodruff School of Mechanical Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332e-mail: yoonjo.kim@me.gatech.edu
Jeremy Jang
Department of Mechanical Science and Engineering,
University of Illinois at Urbana-Champaign
, Urbana, IL 61801
Predrag S. Hrnjak
Department of Mechanical Science and Engineering,
University of Illinois at Urbana-Champaign
, Urbana, IL 61801
Min Soo Kim
School of Mechanical and Aerospace Engineering,
Seoul National University
, Seoul 151-742, KoreaJ. Heat Transfer. Feb 2009, 131(2): 021501 (10 pages)
Published Online: December 11, 2008
Article history
Received:
August 13, 2007
Revised:
August 5, 2008
Published:
December 11, 2008
Citation
Kim, Y. J., Jang, J., Hrnjak, P. S., and Kim, M. S. (December 11, 2008). "Condensation Heat Transfer of Carbon Dioxide Inside Horizontal Smooth and Microfin Tubes at Low Temperatures." ASME. J. Heat Transfer. February 2009; 131(2): 021501. https://doi.org/10.1115/1.2993139
Download citation file:
Get Email Alerts
Cited By
Entropic Analysis of the Maximum Output Power of Thermoradiative Cells
J. Heat Mass Transfer
Molecular Dynamics Simulations in Nanoscale Heat Transfer: A Mini Review
J. Heat Mass Transfer
Related Articles
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)
Heat Transfer Performance During Condensation Inside Spiralled Micro-Fin Tubes
J. Heat Transfer (June,2004)
Effect of Fin Geometry on Condensation of R407C in a Staggered Bundle of Horizontal Finned Tubes
J. Heat Transfer (August,2003)
Related Proceedings Papers
Related Chapters
Liquid Cooled Systems
Thermal Management of Telecommunication Equipment, Second Edition
Liquid Cooled Systems
Thermal Management of Telecommunications Equipment
Thermal Design Guide of Liquid Cooled Systems
Thermal Design of Liquid Cooled Microelectronic Equipment