International Journal of Air-Conditioning and Refrigeration

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Condensation Heat Transfer of R22, R407C, and R410A in Slit Fin-and-Tube Heat Exchanger

  • Jeon, Chang-Duk (Department of Mechanical Engineering, ChungJu University) ;
  • Lee, Jin-Ho (Department of Mechanical Engineering, Yonsei University)
  • Published : 2003.12.01
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Abstract

R410A and R407C are considered to be alternative refrigerants of R22 for the air-conditioners. An experimental study is carried out to investigate the effect of the change of mass flow rate on the characteristics of heat transfer and pressure drop in three row slit finned-tube heat exchanger for R407C, R410A and R22. R407C, a non-azeotropic refrigerant mixture, exhibited a quite different condensation phenomenon from those of R22 and R410A and its condensation heat transfer coefficient was much lower than that of R22 and R410A. On the other hand, the condensation heat transfer coefficient of R410A, near-azeotropic refrigerant mixture, was a little higher than that of R22. R410A also showed the lowest condensation pressure drop across the test section. For all refrigerants, the condensation heat transfer coefficient and pressure drop increase as the mass flux increases. The condensation heat transfer coefficient correlation proposed by Kedzierski shows the best agreement with the experimental data within $\pm$20%.

Keywords

References

  1. Molina, M. J. and Rowland, F. S., 1974, Stratosphere sink for chlorofluoromethanes: Chlorine atom catalyzed destruction of ozone, Nature, Vol. 249, pp.810-812
  2. Kim, M. H., Shin, J. S. and Kim, K J., 1997, An experimental study on the performance of a window system air-conditioner using R407C and R41OB, Korean Journal of Air-Conditioning and Refrigerating Engineering, Vol. 9, No.4, pp. 536-544
  3. Ebisu, T. and Torikoshi, K, 1995, Experimental studies on cross-flow heat exchanger performance using non-azeotropic refrigerant mixture, Proceedings of 19th International Congress of Refrigeration, 4a, pp. 163-170
  4. Ebisu, T., Kasai, D. and Torikoshi, K, 1996, A study thermal performance of air-cooled heat exchangers using alternative refrigerant, 33rd National Heat Transfer Symposium of Japan, Nigata, Vol. 2, pp.525-526
  5. Chen, S., Judge, J. F., Groll, R. and Radermacher, R., 1994, Theoretical analysis of hydrocarbon refrigerant mixtures as a replacement for R-22 for residential uses, Proceedings of 1994 International Refrigeration Conference at Purdue University, West Lafayette, Indiana, USA, pp.225-230
  6. ARl, Participants Handbook: R-22 Alternative Refrigerants Evaluation Program (AREP), June 1993, ARI.
  7. Ryuzaburo, Y., Nobumo, D., Sigeharu, T., Isamu, T., Ebisu, T. and Torikoshi, K, 1994, In-tube heat transfer characteristics of refrigerant mixtures of HFC-32/134a and HFC32/125/134a, Proceedings of 1994 International Refrigeration Conference at Purdue, pp. 293-298
  8. McLinden, M. O., Klein, S. A, Lemmon, E. W. and Peskin, A. P., 1998, Thermodynamic and transport properties of refrigerants and refrigerant mixtures database (REFPROP), Ver.6.01, NIST.
  9. ASHRAE, 1993, Fundamental Handbook (SI).
  10. Kline, S.J. and McClintock, F. A., 1953, Describing uncertainties in single sample experiments, Mechanical Engineering, Vol. 75, pp.3-8
  11. Wang, C. C. and Chiang, C. S., 1997, Two-phase heat transfer characteristics for R22/R407C in a 6.5mm smooth tube, Int. J. Heat and Fluid Flow 18, pp. 550-558
  12. Sami, S. M. and Maltais, H., 2000, Experimental investigation of two phase flow condensation of alternatives to HCHC-22 inside enhanced surface tubing, Applied Thermal Engineering, Vol. 20, pp.1113-1126
  13. Cavallini, A, Censi, G., Col, D. Del, Doretti, L., Longo, G. A and Rossetto, L., 2001, Experimental investigation on condensation heat transfer and pressure drop of new HFC refrigerants, International Journal of Refrigeration, Vol. 24, pp. 73-87
  14. Hwang, S. M., 1999, Condensation heat transfer coefficients of R22 alternative refrigerants on enhanced tubes, International Journal of KSME, Vol. 23, No.4, pp. 459-469
  15. Haraguchi, H., Koyama, S., Esaki, J. and Fujii, T., 1993, Condensation heat transfer of refrigerants HFCI34a, HCFC123 and HCFC22 in horizontal smooth tube and a horizontal micro fin tube, Proc., 30th National Symposia of Japan, Yokohama, pp. 343-345
  16. Choi, J. Y, 1999, Study on the prediction of pressure drop for condensation and evaporation of alternative refrigerants in microfin tubes, Yonsei University, Seoul, Korea
  17. Kedzierski, M. A and Goncaves, J. M., 1997, Horizontal convective condensation of alternative refrigerant within a micro-fin tube, NISTIR 6095, US Dept. Commerce
  18. Cavallini, A, Doretti, L., Klammsteiner, N., Longo, G.A and Rossetto, L., 1995, Condensation of new refrigerant inside smooth and enhanced tube, Proceeding 19th International Refrigeration Conference at Hague, Vol.4, pp. 105-114
  19. Shah, M. M., 1979, A general correlation for heat transfer during film condensation inside pipes, Journal of Heat and Mass Transfer, Vol. 22, pp.547-556
  20. Traviss, D. P., Rohsenow, W. M. and Baron, A B., 1972, Force convection condensation inside tube: a heat transfer equation for condenser design, ASHRAE Transactions, Vol.79, pp.157-165
  21. Jung, D. S., Bae, J. S., Lee, Y. H., Song, Y. J. and Lee, J. K., 1998, Predict pool boiling heat transfer coefficients of pure and mixed refrigerants, Report of Inha University