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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
권호 표지

Condensation Heat Transfer Coefficients of R245fa on a Plain Tube

수평관에서 R245fa의 응축 열전달계수

  • 심윤보 (인하대학교 대학원 기계공학과) ;
  • 박기정 (인하대학교 대학원 기계공학과) ;
  • 정동수 (인하대학교 기계공학과) ;
  • 김종성 ((주)화인텍 센추리)
  • Published : 2007.08.10
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, condensation heat transfer coefficients (HTCs) of R22, R134a, R245fa and R123 are measured on a horizontal plain tube. All data are taken at the vapor temperature of $39^{\circ}C$ with a wall subcooling temperature $3-8^{\circ}C$. Test results show the HTCs of newly developed alternative low vapor pressure refrigerant, R245fa, on a plain tube are 9.5% higher than those of R123 while they are 3.3% and 5.6% lower than those of R134a and R22 respectively. Nusselt's prediction equation for a plain tube underpredicts the data by 13.7% for all refrigerants while a modified equation yielded 5.9% deviation against all data. From the view point of environmental safety and condensation heat transfer, R245fa is a long term good candidate to replace R123 used in centrifugal chillers.

Keywords

References

  1. Montreal protocol on substances that deplete the ozone layer, 1989, Final Act, United Nations Environment Programme
  2. Global Environmental Change Report, 1997, A brief analysis of the Kyoto protocol, Vol.IX, No. 24, December
  3. Marto, P. J. and Nunn, R. H., 1981, Power condenser heat transfer technology, Hemi- sphere Washington, pp. 287-372
  4. Bergles, A. E., 1985, Techniques to augment heat transfer, Handbook of heat transfer application, McGraw-Hill, New York, Ch. 3
  5. Calm, J. M. and Hourahan, G. C., 2001, Refrigerant data summary, Engineered Systems, Vol.18, No. 11, pp. 74-88
  6. Furuta, T., 2006, Development of centrifugal refrigeration machine with R245fa, The International Symposium on New Refrigerants and Environmental Technology 2006, Session 7
  7. Johnson, R. W., 2004, The effect of blowing agent choice on energy use and global warming impact of a refrigerator, International Journal of Refrigeration, Vol. 27, pp. 794-799 https://doi.org/10.1016/j.ijrefrig.2004.07.005
  8. Angelino, G. and Invernizzi, C. C., 2003, Experimental investigation on the thermal stability of some new zero ODP refrigerants, International Journal of Refrigeration, Vol. 26, pp. 51-58 https://doi.org/10.1016/S0140-7007(02)00023-3
  9. Nusselt, W., 1916, Die oberflachenkondensation des wasserdampfes, Z. Ver. Deut. Ing., Vol. 60, p. 541
  10. Nguyen, T. N. and Orozco, J. A., 1994, Condensation of R-1l3 on enhanced surfaces, ASHRAE Transaction, Vol.100 No. 1, pp. 736-743
  11. Cheng, B. and Tao, W. Q., 1994, Experimental study of R- 152a film condensation on single horizontal smooth tube and enhanced tubes, Journal of Heat Transfer, Vol. 116, pp. 266-270 https://doi.org/10.1115/1.2910874
  12. Yilbas, B. S. and Altuntop, N., 1990, Condensing heat transfer of freon-21 on plain horizontal tubes, Indian Journal of Technology, Vol. 28, pp.100-106
  13. Jung, D. S., Kim, C. B., Cho, S. J. and Song, K. H., 1999, Condensation heat transfer coefficients of enhanced tubes with alternative refrigerants for CFC11 and CFC12, International Journal of Refrigeration, Vol. 22 pp. 548-557 https://doi.org/10.1016/S0140-7007(99)00020-1
  14. Hwang, S. M., Kim, K K, Jung, D. S. and Kim, C. B., 1999, Condensation heat transfer coefficients of R22 alternative refrigerants on enhanced tubes, Transactions of the Korean Society of Mechanical Engineers B, Vol. 23, No. 4, pp. 459-469
  15. Jung, D. S., Chae, S. N., Bae, D. S. and Oho, S.J., 2004, Condensation heat transfer coefficients of flammable refrigerants, International Journal of Refrigeration, Vol. 27, pp. 314-317 https://doi.org/10.1016/j.ijrefrig.2003.09.006
  16. Jung, D. S., Chae, S. N., Bae, D. S. and Yoo, G. S., 2005, Condensation heat transfer coefficients of binary HFC mixtures on low fin and Turbo-C tubes, International Journal of Refrigeration, Vol. 28, pp. 212-217 https://doi.org/10.1016/j.ijrefrig.2004.07.023
  17. McLinden, M.O., Klein, S. A., Lemmon, E. W. and Peskin, A. P., 1998, NIST thermodynamics and transport properties of refrigerants and refrigerant mixtures, REFPROP version 6.0
  18. Kline, S.J. and McClintock, F. A., 1953, Describing uncertainties in single-sample experiments, Mechanical Engineer, Vol. 75, pp. 3-8
  19. Yoo, G. S., Hwang, J. H., Park, K.J. and Jung, D. S., 2005, External condensation heat transfer coefficients of R22 alternative refrigerants and R134a according to the saturated vapor temperature change on a smooth tube, Korean Journal of Air-Conditioning and Refrigeration Engneering, Vol. 17, No. 8, pp. 729-735
  20. Collier, J. G. and Thome, J. R., 1994, Convective boiling and condensation, 3rd ed., Clarendon Press, Oxford, pp. 449-453
  21. Kim, N. H., Jung, I. K and Kim, K. H., 1995, An experimental study on condensation heat transfer of low-finned tubes, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 7, No. 2, pp. 298-309
  22. Wanniarachchi, A. S., Marto, P.J. and Rose, J. W., 1986, Film condensation of stream on horizontal finned tubes: Effect of fin spacing, Journal of Heat Transfer, Vol. 108, pp. 960-966 https://doi.org/10.1115/1.3247041
  23. Marto, P.J., Zebrowski, D., Wanniarachchi, A. S. and Rose, J. W., 1990, An experimental study of R-113 film condensation on horizontal integral-fin tubes, Journal of Heat Transfer, Vol.112, pp. 758-767 https://doi.org/10.1115/1.2910451