Thermal Performance of a Finned-tube Heat Exchanger used in Condensing Gas Boiler

  • Kang, Hie-Chan (School of Mechanical & Automotive Eng., Kunsan National University) ;
  • Lim, Bok-Bin (Department of Mech. Eng., Graduate School of Kunsan National University) ;
  • Lee, Jung-Man (Department of Mech. Eng., Graduate School of Kunsan National University) ;
  • Kim, Moo-Han (Department of Mech. Eng., POSTECH)
  • Published : 2009.06.30


In the present study, an experiment was conducted to investigate the heat and mass transfer performance of heat exchangers used in the condensing gas boiler. Two types of spiral circular fin-tube heat exchangers and a plain tube were tested in the flue gas of propane and dry air. Heat and mass transfer coefficients were measured and compared with the previous correlations. The experimental data for the sensible heat transfer of the plain tube reasonably agreed with the previous correlations for dry air and flue gas. However, the mass transfer coefficient of the plain tube was greater than the previous correlations. The pH, $NO_x$, and $SO_x$ data of condensate were provided.



  1. Taniguchi, H., Kudo, K., Huang, Q. and Fujii, A., 1987, Heat and Mass Transfer from Air with High Water Vapor Content (Latent Heat Recovery from Flue Gas), (in Japanese), Trans. of JSME (B), Vol. 53, No. 495, pp. 3377-3382
  2. Kanzaka, M., Soda, M., Yokoo, K., Iwabuchi, M. and Osada, I., 1992, Recovery of Water from Flue Gas (Heat and Mass Transfer on the Spirally Finned Tube), (in Japanese), Trans. of JSME (B), Vol. 58, No. 545, pp. 248-253
  3. Osakabe, M. Yagi, K., Itoh, T., Ohmasa, K., 2003, Condensation Heat Transfer on Tubes in Actual Flue Gas (Parametric study for condensation behavior), Heat transfer, Asian research, Vol. 32, No 2, pp. 152-166
  4. ASHRAE, 1997, ASHRAE Hand Book Fundamentals, USA, pp. 6.1-6.17
  5. Reid, R. C., Prausnitz, J. M. and Poling, B. E., 1987, The Properties of Gases and Liquids, McGraw-Hill, New York, USA, pp. 404-410
  6. Zukauskas, A., 1972, Advanced in Heat Transfer, Vol. 8, Academic press, New York, pp. 93-100
  7. Mills, A. F., Tan, C. and Chung, D. K., 1974, Experimental Study of Condensation from Steam-air Mixtures Flowing over a Horizontal Tube: Overall Condensation Rates, Proc. 5th Int. Heat Transfer Conf., Vol. 5, pp. 20-30
  8. Fujii, T., Honda, H., Oda, K. and Kawano, S., 1981, Forced Convective Condensation of Low Pressure Steam-air Mixture on a Horizontal Tube, (in Japanese), Trans. JSME (B), Vol. 47, No. 417, pp. 836-843
  9. Jeong, D., W., Lee, S. Y. and Lee, H. J., 1999, Review of Mass Transfer Correlations on Laminar Film Condensation of Vapor/Gas Mixture with High Concentration of Non-condensable, Proc. of KSME Fall Meeting, Vol. KSME 99F260, pp. 370-377