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TECHNICAL PAPERS: Evaporative Boiling and Condensation

Heat Transfer Performance During Condensation Inside Spiralled Micro-Fin Tubes

[+] Author and Article Information
Jean-Pierre M. Bukasa

Department of Mechanical Engineering, Rand Afrikaans University, PO Box 524, Auckland Park 2006, Johannesburg, South Africa

Leon Liebenberg

Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria 0002, South Africa

Josua P. Meyer

Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria 000, South Africae-mail: jmeyer@up.ac.za

J. Heat Transfer 126(3), 321-328 (Jun 16, 2004) (8 pages) doi:10.1115/1.1737777 History: Received November 27, 2002; Revised March 12, 2004; Online June 16, 2004
Copyright © 2004 by ASME
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References

Schlager,  L. M., Pate,  M. B., and Bergles,  A. E., 1990, “Evaporation and Condensation Heat Transfer and Pressure Drop in Horizontal 12.7 mm Microfin Tubes With Refrigerant 22,” ASME J. Heat Transfer, 112, pp. 1041–1047.
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Eckels,  S. J., and Tesene,  B. A., 1999, “A Comparison of R-22, R-134a, R-410A and R-407C Condensation Performance in Smooth and Enhanced Tubes: Part 1, Heat Transfer,” ASHRAE Trans., 105, pp. 428–441.
Muzzio,  A., Niro,  A., and Arosio,  S., 1998, “Heat Transfer and Pressure Drop During Evaporation and Condensation of HCFC-22 Inside 9.52-mm O.D. Microfin Tubes at Different Geometries,” J. Enhanced Heat Transfer, 5, pp. 39–52.
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Smit,  F. J., Thome,  J. R., and Meyer,  J. P., 2002, “Heat Transfer Coefficients During Condensation of the Zeotropic Refrigerant Mixture HCFC-22/HCFC-142b,” ASME J. Heat Transfer, 124(6), pp. 1137–1146.
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Bukasa, J. P. M., 2002, “Heat Transfer Performance During Condensation Inside Spiralled Microfin Tubes,” Ph.D. thesis, Department of Mechanical Engineering, Rand Afrikaans University, Johannesburg, South Africa.
Liebenberg, L., 2002, “A Unified Prediction Method for Smooth and Micro-Fin Tube Condensation Performance,” Ph.D. thesis, Rand Afrikaans University, Johannesburg, South Africa.
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Figures

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Schematic representation of the experimental apparatus
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Average heat transfer coefficients for condensation of R-407C inside micro-fin tubes. (Uncertainties in average heat transfer coefficient: ±7% at low mass fluxes; ±40% at high mass fluxes; Uncertainties in mass fluxes: ±0.31% for low mass fluxes; ±0.15% for high mass fluxes.)
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Enhancement factors for condensation inside micro-fin tubes
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Local heat transfer coefficients for condensation of R-134a inside micro-fin tubes. (Uncertainties in local heat transfer coefficient: ±15%; Uncertainties in vapor quality: ±4.58% at low mass fluxes; ±1.46% at high mass fluxes.)
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Local enhancement factors for refrigerants in micro-fin tubes at mass fluxes of 300 kg/m2  s and 800 kg/m2  s at three different spiral angles
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Enhancement factor versus spiral angle for condensation of R-407C inside micro-fin tubes at mass fluxes of 300 kg/m2  s and 800 kg/m2  s
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Enhancement factor versus spiral angle for condensation of R-22 inside micro-fin tubes at 300 kg/m2  s
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Enhancement factor versus spiral angle for condensation of R-134a inside micro-fin tubes at a mass flux of 800 kg/m2  s
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Comparison between experimental and predicted heat transfer coefficients for condensation inside smooth and micro-fin tubes
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Comparison between experimental and predicted heat transfer coefficients calculated from different predictive models for condensation inside spiralled micro-fin tubes. (Uncertainties in local heat transfer coefficient: ±15%.)

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