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http://dx.doi.org/10.3795/KSME-B.2002.26.7.911

Evaporation Heat Transfer Characteristics of CO2 R-22 and R-134a in a Horizontal Smooth Tube  

Yun, Rin (고려대학교 대학원 기계공학과)
Hwang, Jun-Hyeon (LG 전자주식회사)
Choi, Young-Don (고려대학교 기계공학과)
Kim, Yong-Chan (고려대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.26, no.7, 2002 , pp. 911-918 More about this Journal
Abstract
Evaporation heat transfer coefficients of carbon dioxide($CO_2$), R-22, and R-134a in a horizontal smooth tube were measured and analyzed as a function of heat flux, mass flux, and evaporating temperature. The experiments were carried out by varying heat flux from 10 to 20 $kW/m^2$, mass flux from 170 to 340 $kg/m^2s$, and saturation temperatures of 5 and $10^{\circ}C$. It was found that the heat transfer coefficient of $CO_2$ decreased with a rise of quality due to an earlier liquid-film dryout as compared to R-22 and R-134a. Averaged heat transfer coefficients of $CO_2$ were 22-63% higher than those of R-22 and R-134a at all test conditions. The effects of mass flux and heat flux on averaged heat transfer coefficients were much greater in $CO_2$ than in R-22 and R-134a. When comparing $CO_2$ test results with the correlations in the literature, the existing models yielded large deviations at medium and high qualities. Therefore, a generalized correlation for $CO_2$evaporation heat transfer needs to be developed by including the effects of dryout phenomenon.
Keywords
Carbon Dioxide($CO_2$); Evaporation Heat Transfer; Smooth Tube; Natural Refrigerant;
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1 Shah, M. M., 1979, 'A General Correlation for Heat Transfer during Film Condensation Inside Pipes,'Int. J. Heat Mass Transfer, Vol. 22,pp. 547-556   DOI   ScienceOn
2 Gungor, K, E., Winterton, R. H. S., 1986, 'A General Correlation for Flow Boiling in Tubes and Annuli,'lnt. J. of Heat Mass Transfer, Vol. 29, No.3, pp. 351-358   DOI   ScienceOn
3 Liu, Z., Winterton, R.H.S., 1991, 'A General Correlation for Saturated and Subcooled Flow Boiling in Tubes and Annuli Based on a Nucleate Pool Boiling Equation,'lnt. J. Heat Mass Transfer, Vol. 34, pp. 2759-2766   DOI   ScienceOn
4 Taitel, Y. and Dukler, A. E., 1976, 'A Model for Predicting Flow Regime Transitions in Horizontal and Near Horizontal Gas-Liquid flow,'A.l.Ch. E. J., Vol. 22.pp. 47-55   DOI   ScienceOn
5 Kefer, V., Kohler, W., Kastner, W., 1989, 'Critcal Heat Flux and Post-CHF Heat Transfer in Horizontal and Inclined Evaporator tubes,'Int. J. Multiphase Flow, Vol. 15, No.3,pp. 385-392   DOI   ScienceOn
6 Hihara, E., Tanaka, S., 2000, 'Boiling Heat Transfer of Carbon Dioxide in Horizontal Tubes,IIF-IIR Commission 81, 82, E1 and E2
7 Pettersen. J. Rieberer. R., Munkejord. ST, 2000, 'Heat Transfer and Pressure Drop Characteristics of Evaporating Carbon Dioxide in Microchannel Tubes,IIF-IIR Commission B1, Purdue Univ., USA, pp.107-114
8 Ha. S. C. 2000, 'Some Aspects of Experimental Intube Evaporation,'KSME Int. J., Vol. 14. pp. 537-546   DOI
9 Moffat. R. J. 1985, 'Using Uncertainty Analysis in the Planning of an Experiment,'Journal of Fluids Engineering, Vol. 107, pp. 173 - 178   DOI
10 Cho, E. S., Yoon, S. H., Kim, M. S., 2000, 'A Study on the Characteristics of Evaporative Heat Transfer for Carbon Dioxide in a Horizontal Tube,' Proceedings of the KSME 2000 Spring Annual Meeting B, pp. 104-107
11 Lorentzen. G., 1994, 'Revival of Carbondioxide as a Refrigerant,' lnt. J. Refrig, Vol. 17, pp. 292-301   DOI   ScienceOn
12 Branas, M., 2000, lEAs ANNEX 27: 'Selected Issues on $CO_2$as Working Fluid in Compression Systems,'Proceedings of the 4th IIR-Gustav Lorentzen Conference on Natural Working Fluids, Purdue Univ., USA, pp. 1-7
13 Yuan, Z., Michael, M., Jafar, D., 1999, 'Forced Convection Boiling Heat Transfer of $CO_2$in Horizontal Tubes,'Xth ASMEIJSME Joint Thermal Engineering Conference