Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
권호 표지

Evaporation Heat Transfer Characteristics of $CO_2$ in a Horizontal Tube

  • Lee Dong-Geon (Dept. of Refrigeration and A/C Eng., Graduate School, Pukyong National Uni.) ;
  • Son Chang-Hyo (Dept. of Refrigeration and A/C Eng., Graduate School, Pukyong National University.) ;
  • Oh Hoo-Kyu (Dept. of Refrigeration and A/C Eng., Pukyong National University.)
  • Published : 2005.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

The evaporation heat transfer coefficient of $CO_2$ (R-744) in a horizontal tube was investigated experimentally. The experiments were conducted without oil in a closed refrigerant loop which was driven by a magnetic gear pump. The main components of the refrigerant loop are a receiver. a variable-speed pump. a mass flow meter. a pre-heater and evaporator (test section). The test section consists of a smooth. horizontal stainless steel tube of 7.75 mm inner diameter. The experiments were conducted at mass flux of 200 to $500\;kg/m^{2}s$. saturation temperature of $-5^{\circ}C\;to\;5^{\circ}C$. and heat flux of 10 to $40\;kW/m^2$. The test results showed the evaporation heat transfer of $CO_2$ has greatly effect on more nucleate boiling than convective boiling. The evaporation heat transfer coefficients of $CO_2$ are highly dependent on the vapor quality. heat flux and saturation temperature. The evaporation heat transfer coefficient of $CO_2$ is very larger than that of R-22 and R-134a. In making a comparison between test results and existing correlations. the present experimental data are the best fit for the correlation of Jung et al. But it was failed to predict the evaporation heat transfer coefficient of $CO_2$ using by the existing correlation. Therefore. it is necessary to develop reliable and accurate predictions determining the evaporation heat transfer coefficient of $CO_2$ in a horizontal tube.

Keywords

References

  1. Lorentzen, G. and Pettersen, J., A new, efficient and environmentally benign system for car airconditioning, International Journal of Refrigeration, Vol. 16, No. 1, pp. 4-12, 1993 https://doi.org/10.1016/0140-7007(93)90014-Y
  2. Zhao. Y., Ohadi, M. M.. Dessiatoun, S. V., Molki, M., Darabi, J., Forced convection boiling heat transfer of $CO_2$ in horizontal tube. in : AJTE99-6249, Proc. 5th ASME/ JSME Joint Thermal Engineering Conference, San Diego, California, 1999
  3. Pettersen, J., Two-phase flow pattern, heat transfer and pressure drop in microchannel vaporization of $CO_2$. ASHRAE Transaction (Symposia), pp. 523-532. 2003
  4. Hihara, E. and Tanaka, S.. Boiling Heat Transfer of Carbon dioxide in Horizontal Tubes, Proc. 4th IIR-Gustav Lorentzen Conf. On Natural Working Fluids, Purdue University, USA, PP. 279-284, 2000
  5. Cho. E. S., Yoon, S. H., and Kim, M. S., A study on the characteristics of evaporative heat transfer for carbon dioxide in a horizontal tube, in: Proceedings of the KSME Spring Annual Meeting. pp. 104-107. 2000
  6. Cooper, M. G., Heat Flow Rates in Saturated Nucleate Pool Boiling a Wide-ranging Examination Using Reduced Properties, Advances in Heat Transfer. Vol. 16, pp. 157-239. 1984
  7. Shah. M. M., A general correlation for heat transfer during film condensation inside pipes, International Journal of Heat and Mass Transfer, Vol. 22, pp. 157-165. 1979 https://doi.org/10.1016/0017-9310(79)90108-X
  8. Gungor, K. E. and Winterton, R. H. S., Simplified General Correlation for Flow Saturated Boiling and Comparisons of Correlations with Data, Chem. Eng. Res, Des., Vol. 65, pp. 148-156, 1987
  9. Kandlikar. S.G., 'A general correlation for saturated two-phase flow boiling horizontal and vertical tubes', Trans. ASME, Vol. 112, pp. 219-228, 1990 https://doi.org/10.1115/1.2910348
  10. Jung, D.S. McLinden, M., Randermacher, R., and Didion, D., 'A study of flow boiling heat transfer with refrigerant mixtures'. International Journal of Heat and Mass Transfer, Vol. 32, No. 9, pp. 1751-1764. 1989 https://doi.org/10.1016/0017-9310(89)90057-4
  11. Liu, Z. and Winterton, R. H. S., A General Correlation for Saturated and Subcooled Flow Boiling in Tubes and Annuli, Based on a Nucleate Pool Boiling Equation, Int. J. Heat and Mass Transfer, Vol. 34, No. 1, pp 2759-2766, 1991 https://doi.org/10.1016/0017-9310(91)90234-6