Air-side Heat Transfer and Friction Characteristics of Fined-tube Heat Exchangers under Heating Condition

핀-관 열교환기의 난방운전 시 공기측 열전달 및 마찰특성

  • Kwon, Young Chul (Division of Mechanical Engineering) ;
  • Chang, Keun Sun (Division of Mechanical Engineering) ;
  • Ko, Kuk Won (Department of Control and Measurement Engineering) ;
  • Kim, Young Jae (Chemical and Biochemical Engineering) ;
  • Park, Byung Kwon (Division of Mechanical Engineering)
  • 권영철 (선문대학교 기계공학부) ;
  • 장근선 (선문대학교 기계공학부) ;
  • 고국원 (선문대학교 제어계측공학과) ;
  • 김영재 (선문대학교 생명화학공학과) ;
  • 박병권 (선문대학교 기계공학부)
  • Received : 2006.06.05
  • Accepted : 2006.08.16
  • Published : 2006.10.10

Abstract

An experimental study has been performed to investigate the characteristics of air-side heat transfer and friction of a fined tube heat exchanger under heating conditions. Air enthalpy calorimeter was used to obtain the performance evaluation and analysis of the fined tube heat exchanger. Eight finned tube heat exchangers with slit fin, louver fin, and plain fin were used. The air-side heat transfer coefficient was calculated by the log-mean-temperature-difference. Air-side heat transfer and friction were presented in terms of j factor and friction factor on Reynolds number. From the experimental result, it was found that the variations of air-side heat transfer and friction of fined tube heat exchanger with the change of the fin configuration, row number, fin pitch, and tube circuit were obtained. j factor and friction factor decreased with Reynolds number increased. The tube circuit affected the air-side heat transfer and friction. In the case of slit and louver fin, j factor of 1st row was higher than that of 2nd row. But, with increasing Re, j factor was reversed. The characteristics of j factor and friction factor of 2nd row heat exchanger were different according to the kind of fins.

Keywords

fined-tube;heat exchanger;friction;heat transfer;j factor;heating

References

  1. F. C. McQiston, ASHRAE Transactions, 84, 266 (1978)
  2. C. C. Wang, W. H. Tao, C. J. Chang, Int. J. of Refrigeration, 22, 595 (1999) https://doi.org/10.1016/S0140-7007(99)00031-6
  3. F. Halici, I. Taymaz, and M. Gunduz, Energy, 26, 963 (2001) https://doi.org/10.1016/S0360-5442(01)00048-2
  4. T. E. Schmidt, Journal of ASRE, 4, 351 (1949)
  5. RRC, Report (2005)
  6. V. Gnielinski, Int. Chem. Engineering, 16, 359 (1976)
  7. S. Sawai, T. Hayashi, Y. Ohtake, and T. Takei, Refrigeration, 41, 15 (1969)
  8. X. Hu and A. M. Jacobi, Journal of Heat Transfer, 115, 66 (1993) https://doi.org/10.1115/1.2910671
  9. D. L. Gray and R. L. Webb, Proceeding of 8th Int. Heat Transfer Conference, 2745 (1986)
  10. W. Nakayama and L. P. Xu, 1st ASME/JSME. Thermal Engineering Joint Conference, 495 (1983)
  11. D. G. Rich, ASHRAE Transactions, 79, 135 (1973)
  12. B. Youn, Y. S. Kim, and H. Y. Park, Air-conditioning and Refrigeration Engineering, 25, 151 (1996)
  13. F. E. M. Saboya and E. M. Sparrow, Transactions of the ASME., 96, 265 (1974) https://doi.org/10.1115/1.3450189