Browse > Article
http://dx.doi.org/10.6110/KJACR.2017.29.5.231

Effects of Tube Diameter and Surface Sub-Cooling Temperature on R1234ze(E) and R1233zd(E) Film Condensation Heat Transfer Characteristics in Smooth Horizontal Laboratory Tubes  

Jeon, Dong-Soon (Thermal & Fluid System Group, Korea Institute of Industrial Technology)
Ko, Ji-Woon (Thermal & Fluid System Group, Korea Institute of Industrial Technology)
Kim, Seon-Chang (Thermal & Fluid System Group, Korea Institute of Industrial Technology)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.29, no.5, 2017 , pp. 231-238 More about this Journal
Abstract
HFO refrigerants have recently come to be regarded as promising alternatives to R134a for use in turbo chillers. This study provides results from experiments evaluating the film condensation heat transfer characteristics of HFO refrigerants R1234ze(E) and R1233zd(E) on smooth horizontal laboratory tubes. The experiments were conducted at a saturation vapor temperature of $38.0^{\circ}C$ with surface sub-cooling temperatures in the range of $3{\sim}15^{\circ}C$. We observe that the film condensation heat transfer coefficient decreases as surface sub-cooling temperatures increase. In the case of laboratory tubes with a diameter of 19.05 mm, the film condensation heat transfer coefficients of R1234ze(E) and R1233zd(E) were approximately 11% and 20% lower than those of R134a, respectively. Furthermore, our investigation of the effect of tube diameter on film condensation heat transfer coefficients, demonstrates an inverse relationship where the film condensation heat transfer coefficient increases as laboratory tube diameter decreases. We propose experimental correlations of Nusselt number for R1234ze(E) and R1233zd(E), which yield a ${\pm}20%$ error band.
Keywords
Film condensation heat transfer coefficient; Horizontal smooth tube; R1234ze(E); R1233zd(E); Surface subcooling temperature; Tube diameter;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Ryuichi, N., Chieko, K., and Shigeru, K., 2015, Comparative assessment of condensation and pool boiling heat transfer on horizontal plain single tubes for R1234ze(E), R1234ze(Z) and R1233zd(E), Int. Journal of Refrigeration, Vol. 63, pp. 157-170.
2 Kim, M. S., Lee, Y. S., and Cho, K. N., 2016, Effect of tube diameter and saturation temperature on flow boiling characteristics of R-446A and R-1234ze(E), Proceedings of SAREK '16 Winter Annual Conference, pp. 43-46.
3 Shon, B. H., Kim, D. W., Jung, C. W., Lee, D. C., Kang, Y. T., and Kim, Y. C., 2016, Characteristics of evaporation and condensation for low GWP refrigerants in plate heat exchanger, Proceedings of SAREK '16 Winter Annual Conference, pp. 39-42.
4 Petukhov, B. S., Irvine, T. F., and Hartnett, J. P., 1970, Advances in Heat Transfer, Academic Press, New York.
5 Incropera, F. P. and DeWitt, D. P., 1996, Fundamentals of Heat and Mass Transfer 4th Edition, John Wiley & Sons, Inc.
6 Rohsenow, W. M., 1956, Heat transfer and temperature distribution in laminar film condensation, Trans. ASME, Vol. 78, pp. 1645-1648.
7 Collier, J. G., 1972, Convective Boiling and Condensation 2nd Edition, Mc-Graw-Hill.
8 Selin, G., 1961, Heat transfer by condensating pure vapors outside inclined tubes, Proceedings of Int. Heat Transfer Conference, Univ. of Colorado, Part II, pp. 279-289.
9 Carey, V. P., 1992, Liquid-vapor phase-change phenomena : An introduction to the thermophysics of vaporization and condensation processes in heat transfer equipment, Hemisphere Pub. Co.