Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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An Experimental Study on the Evaporative Heat Transfer Characteristics of $CO_2$/Propane Mixtures Flowing Upward in Vertical Smooth and Micro-fin Tubes with an Outer Diameter of 5 mm

외경 5mm 수직 평활관 및 마이크로핀관 내의 이산화탄소/프로판 혼합냉매의 증발열전달 특성에 관한 실험적 연구

  • Cho, Jin-Min (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Kim, Min-Soo (School of Mechanical and Aerospace Engineering, Seoul National University)
  • 조진민 (서울대학교 기계항공공학부) ;
  • 김민수 (서울대학교 기계항공공학부)
  • Published : 2009.04.10
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Abstract

Refrigerant mixtures provide an opportunity to adjust their properties to fit design criteria and a possibility to create new blends that can improve heat transfer characteristics. Therefore, mixture of $CO_2$ and propane is chosen which may be a promising refrigerant and has good environmental compatibility. This paper presents measured heat transfer coefficient data during evaporation process of $CO_2$/propane mixtures flowing upward in vertical smooth and. micro-fin tubes. Smooth and micro-fin tubes with outer diameters of 5 mm and length of 1.44in were selected as test tubes. The tests were conducted at mass fluxes of 212 to $656kg/m^{2}s$, inlet temperatures of -10 to $30^{\circ}C$, heat fluxes of 15 to $60\;kW/m^2$ and for several compositions (75/25, 50/50, 25/75 wt%). Among $CO_2$/propane refrigerant mixtures, the heat transfer characteristics are much better than that of any compositions when the composition is 75/25 (wt%).

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References

  1. Yoon, S. H., Cho, E. S., Hwang, Y. W., Kim, M. S., Min, K. D., and Kim, Y. C., 2004, Characteristics of evaporative heat transfer and pressure drop of carbon dioxide and correlation development, Int. J. Refrig., Vol. 27, No. 2, pp. 111-119 https://doi.org/10.1016/j.ijrefrig.2003.08.006
  2. Cho, J. M. and Kim, M. S., 2007, Experimental studies on the evaporative heat transfer and pressure drop of CO2 in smooth and micro-fin tubes of the diameter of 5 and 9.52 mm, Int. J. Refrig., Vol. 30, No. 6, pp. 968-994
  3. Kim, Y. J., Cho, J. M., and Kim, M. S, 2008, Experimental study on the evaporative heat transfer and pressure drop of CO2 flowing upward in a vertical smooth and micro-fin tubes of the diameter of 5 mm, Int. J. Refrig., Vol. 31, No. 5, pp. 771-779 https://doi.org/10.1016/j.ijrefrig.2007.12.001
  4. Shin, J. Y., 2002, Convective boiling heat transfer of the pure refrigerant and the refrigerant mixtures, Ph. D. Thesis, School of Mechanical and Aerospace Engineering, Seoul National University, Korea
  5. Wen, M. Y. and Ho, C. Y., 2005, Evaporation heat transfer and pressure drop characteristics of R-290 (propane), R-600 (butane), and mixture of R-290/R-600 in the threelines serpentine small-tube bank, Applied Thermal Engineering, Vol. 25, No. 17-18, pp. 2921-2936 https://doi.org/10.1016/j.applthermaleng.2005.02.013
  6. Cho, J. M., Kim, J. H, Yoon, S. H, and Kim, M. S., 2005, Experimental studies on the evaporative heat transfer of R32/290 mixtures in a horizontal smooth tube, Proceeding of the SAREK winter annual conference, pp. 268-273
  7. Kim, J. H, Cho, J. M., and Kim, M. S., 2008, Cooling performance of several CO2/propane mixtures and glide matching with secondary heat transfer fluid, Int. J. Refrig., Vol. 31, No. 5, pp. 800-806 https://doi.org/10.1016/j.ijrefrig.2007.11.009
  8. Lemmon, E. W., McLinden, M. O., and Huber, M. L., 2002, Reference Fluid Thermodynamic and Transport Properties (PEFPROP), NIST Standard Reference Database 23, Version 7.0, National Institute of Standards and Technology, Maryland, USA
  9. Gnielinski, V., 1976, New equations for heat and mass transfer in turbulent pipe and channel flow, Int. Chem. Eng., Vol. 16 pp. 359-368
  10. Cho, J. M., Kim, Y. C., and Kim, M. S., 2008, Experimental studies on the evaporative heat transfer characteristics of CO2/propane refrigerant mixtues in horizontal smooth and micro-fin tubes, Trans. of the Korean Soc. Mech. Eng.(B), Vol. 32, No. 4, pp. 290-299 https://doi.org/10.3795/KSME-B.2008.32.4.290
  11. Jackson, J. D. and Hall, W. B., 1979, Influence of buoyancy on heat transfer to fluids flowing in vertical tubes under turbulent conditions, Turbulent forced convection in channels and bundles, Hemisphere, pp. 613-640