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TECHNICAL PAPERS: Heat Transfer Enhancement

R-22 and Zeotropic R-22/R-142b Mixture Condensation in Microfin, High-Fin, and Twisted Tape Insert Tubes

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

Rand Afrikaans University, Johannesburg, South Africa

J. P. Meyer

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

J. Heat Transfer 124(5), 912-921 (Sep 11, 2002) (10 pages) doi:10.1115/1.1484394 History: Received August 21, 2000; Revised April 05, 2002; Online September 11, 2002
Copyright © 2002 by ASME
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References

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Thome,  J. R., 1996, “Boiling of New Refrigerants: A State-of-the-Art Review,” Int. J. Refrig., 19(7), pp. 435–457.
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Smit,  F. J., and Meyer,  J. P., 1998, “Investigation of the Potential Effect of Zeotropic Refrigerant Mixture on Performance of a Hot-Water Heat Pump,” ASHRAE Trans., 104, (Part 1A), pp. 387–394.
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Kebonte, S. A., 1999, “Condensation Heat Transfer and Pressure Drop Coefficients of R22/R142b in a Water Cooled Helically Coiled Tube-in-Tube Heat Exchanger,” M. Eng. dissertation, Rand Afrikaans University, Johannesburg, South Africa.
Bukasa, J. M., 1999, “Average Boiling Heat Transfer and Pressure Drop Coefficients of R22/R142b in a Helically Coiled Water Heated Tube-in-Tube Heat Exchanger,” M.Eng. dissertation, Rand Afrikaans University, Johannesburg, South Africa.
Meyer,  J. P., Bukasa,  J. M., and Kebonte,  S. A., 2000, “Average Boiling and Condensation Heat Transfer Coefficients of the Zeotropic Refrigerant Mixture R22/R142b in a Coaxial Tube-in-Tube Heat Exchanger,” ASME J. Heat Transfer, 122, pp. 186–188.
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ANSI/ASHRAE 1996, ASHRAE STANDARD 41.4, “Standard Method for Measurement of Proportion of Lubricant in Liquid Refrigerant,” American Society of Heating, Refrigerating and Air-Conditioning Engineers, Atlanta, GA.
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Figures

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Schematic of test facility
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Profile of the microfin tube (9.53 mm outer diameter)
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Profile of the high fin tube (9.52 mm outer diameter)
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Comparison between literature and measured heat transfer coefficients of R-22 condensing in smooth and microfin tubes at a mass flux of 400 kg/m2 .s and a saturation temperature of 50°C
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Comparison between literature and measured average heat transfer coefficients of R-22 as function of mass flux in smooth and microfin tubes at a saturation temperature of 40°C
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Comparison between literature and measured pressure gradients of R-22 condensing in smooth and microfin tubes at a mass flux of 250 kg/m2 .s and a saturation temperature of 50°C
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Comparison between literature and measured pressure drops of R-22 as function of mass flux in smooth and microfin tubes at a saturation temperature of 40°C
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Average heat transfer coefficients for R-22/R-142b (mass fraction of 70 percent/30 percent) during condensation at a dew point temperature of 76.13°C for different heat transfer enhancement methods and a smooth tube
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Average pressure drop for R-22/R-142b (mass fraction of 70 percent/30 percent) during condensation at a dew point temperature of 76.13°C for different heat transfer enhancement methods and a smooth tube
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Sectional heat transfer coefficients in smooth and microfin tubes at different mass fractions of R-22/R-142b at a mass flux of 100 kg/m2 .s
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Sectional heat transfer coefficients in smooth and microfin tubes at different mass fractions of R-22/R-142b at a mass flux of 300 kg/m2 .s
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Sectional heat transfer coefficients in smooth and microfin tubes at different mass fractions of R-22/R-142b at a mass flux of 600 kg/m2 .s
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Heat transfer enhancement factor at a mass flux of 100 kg/m2 .s for different refrigerant mass fractions
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Heat transfer enhancement factor at a mass flux of 300 kg/m2 .s for different refrigerant mass fractions
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Heat transfer enhancement factor at a mass flux of 600 kg/m2 .s for different refrigerant mass fractions
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Average heat transfer coefficients in the microfin tube as function of mass flux for different refrigerant mass fractions
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Pressure drop in the microfin tube as function of mass flux for different refrigerant mass fractions
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Average heat transfer enhancement factor as function of mass flux for different refrigerant mass fractions
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Pressure drop enhancement factor as function of mass flux for different refrigerant mass fractions

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