Browse > Article

Condensation Heat Transfer Coefficients of R245fa on a Plain Tube  

Shim, Yun-Bo (Graduate School, Inha University)
Park, Ki-Jung (Graduate School, Inha University)
Jung, Dong-Soo (Department of Mechanical Engineering, Inha University)
Kim, Jong-Seong (Finetec Century Corp.)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.19, no.8, 2007 , pp. 555-562 More about this Journal
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
Condensation heat transfer; Heat transfer coefficients(HTCs); R245fa; Ozone layer depletion;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Furuta, T., 2006, Development of centrifugal refrigeration machine with R245fa, The International Symposium on New Refrigerants and Environmental Technology 2006, Session 7
2 Montreal protocol on substances that deplete the ozone layer, 1989, Final Act, United Nations Environment Programme
3 Calm, J. M. and Hourahan, G. C., 2001, Refrigerant data summary, Engineered Systems, Vol.18, No. 11, pp. 74-88
4 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
5 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   DOI   ScienceOn
6 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
7 Marto, P. J. and Nunn, R. H., 1981, Power condenser heat transfer technology, Hemi- sphere Washington, pp. 287-372
8 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   DOI   ScienceOn
9 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
10 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   DOI
11 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   과학기술학회마을
12 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   DOI   ScienceOn
13 Nguyen, T. N. and Orozco, J. A., 1994, Condensation of R-1l3 on enhanced surfaces, ASHRAE Transaction, Vol.100 No. 1, pp. 736-743
14 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
15 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   DOI
16 Kline, S.J. and McClintock, F. A., 1953, Describing uncertainties in single-sample experiments, Mechanical Engineer, Vol. 75, pp. 3-8
17 Global Environmental Change Report, 1997, A brief analysis of the Kyoto protocol, Vol.IX, No. 24, December
18 Nusselt, W., 1916, Die oberflachenkondensation des wasserdampfes, Z. Ver. Deut. Ing., Vol. 60, p. 541
19 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   DOI   ScienceOn
20 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   DOI   ScienceOn
21 Collier, J. G. and Thome, J. R., 1994, Convective boiling and condensation, 3rd ed., Clarendon Press, Oxford, pp. 449-453
22 Bergles, A. E., 1985, Techniques to augment heat transfer, Handbook of heat transfer application, McGraw-Hill, New York, Ch. 3
23 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   DOI   ScienceOn