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http://dx.doi.org/10.6110/KJACR.2011.23.3.208

Pool Boiling Heat Transfer Coefficient of R245fa on the Plain Tube and the Low Fin Tube  

Park, Ki-Jung (Graduate School, Inha University)
Lee, Yo-Han (Graduate School, Inha University)
Lim, Byeong-Deok (Graduate School, Inha University)
Jung, Dong-Soo (Department of Mechanical Engineering, Inha University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.23, no.3, 2011 , pp. 208-215 More about this Journal
Abstract
In this work, pool boiling heat transfer coefficients(HTCs) of R22, R123, R134a, and R245fa are measured on both horizontal plain and 26 fpi low fin tubes. The pool boiling temperature is maintained at $7^{\circ}C$ and heat flux is varied from 80 $kW/m^2$ to 10 $kW/m^2$ with an interval of 10 $kW/m^2$. Wall temperatures are measured directly by thermocouples inserted through holes of 0.5 mm diameter. Test results show that HTCs of high vapor pressure refrigerants are usually higher than those of low pressure fluids in both plain and low fin tubes. On a plain tube, HTCs of R245fa are 23.3% higher than those of R123 while on a 26 fpi low fin tube, HTCs of R245fa are 46.3% higher than those of R123. The fin effect is more prominent with low vapor pressure refrigerants than with high vapor pressure ones due to a sweeping effect.
Keywords
Pool boiling heat transfer coefficients; Low fin tube; R245fa; Evaporator; Chiller;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 Angelino, G. and Invernizzi, C. C., 2003, Experimental investigation on the thermal stability of some new zero ODP refrigerants, Int. J. of Refrigeration, Vol. 26, pp. 51-58.   DOI   ScienceOn
2 Kline, S. J. and McClintock, F. A., 1953, Describing uncertainties in single-sample experiments, Mechanical Engineer, Vol. 75, pp. 3-8.
3 Lemmon, E. W., Huber, M. L. and McLinden, M. O., 2007, NIST Reference Fluid Thermodynamics and Transport Properties, REFPR OP version 8.0.
4 Cooper, M. G., 1982, Correlations for nucleate boiling-formulation using reduced properties, Physico Chemical Hydrodynamics, Vol. 3, No. 2, pp. 89-111.
5 Stephan, K. and Abdelsalam, M., 1980, Heat transfer correlations for natural convection boiling, Int. J. of Heat and Mass Transfer, Vol. 23, pp. 73-87.   DOI   ScienceOn
6 Park, K. J., Baek, I. C. and Jung, D. S., 2006, Development of pool boiling heat transfer correlation for hydrocarbon refrigerants, Korea Journal of Air-Conditioning and Refrigeration Engineering, Vol. 18, No. 3, pp. 247-253.
7 Marto, P. J., Wanniarachchi, A. S. and Pulido, R. J., 1985, Augmenting the nucleate pool boiling characteristics of Gewa-T finned tubes in R-113, Augmentation of heat transfer in energy systems, Vol. HTD52, pp. 67-73.
8 Molina, M. J. and Rowland, F. S., 1974, Stratospheric sink for chlorofluoromethanes：chorine atom catalyzed destruction of ozones, Nature, Vol. 249, pp. 810-812.   DOI
9 Webb, R. L., 1994, Principles of enhanced heat transfer, John Wiley and Sons Inc., New York, pp. 311-372.
10 Montreal protocol on substances that deplete the ozone layer, 1989, Final Act, United nations Environment Programme.
11 Rubin, I. R., Roizen, L. I., Dul'kin, I. N. and Yudina, L. A., 1979, Heat transfer in the boiling of a liquid on horizontal pipes with annular fins, High Temperature, Vol. 17, No. 3, pp. 475-480.
12 Song, K. H., Lee, J. K., Jung, D. S. and Kim, C. B., 1998, Pool boiling heat transfer coefficients of alternative refrigerants on low fin tube, Korea Journal of Air-Conditioning and Refrigeration Engineering, Vol. 10, No. 4, pp. 411-422.
13 Jung, D. S., Kim, Y. G., Ko, Y. H. and Song, K. H., 2003, Nucleate boiling heat transfer coefficients of pure halogenated refrigerants, Int. J. of Refrigeration, Vol. 26, pp. 240-248.   DOI   ScienceOn
14 Johnson, R. W., 2004, The effect of blowing agent choice on energy use and global warming impact of a refrigerator, Int. J. of Refrigeration, Vol. 27, pp. 794-799.   DOI   ScienceOn