International Journal of Air-Conditioning and Refrigeration

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
권호 표지

An Experimental Study of the Airside Performance of Slit Fin-and-Tube Heat Exchangers under Dry and Wet Conditions

  • Published : 2009.03.31
Download PDF
⟨ Previous Next ⟩

Abstract

Water condensate accumulated on the surface of a fin-and-tube heat exchanger significantly affects its thermal and hydraulic performances. The purpose of this study is to investigate the effects of condensate retention on the air-side heat transfer performance and flow friction for various flow and geometric conditions. Total of twelve samples of slit and plate fin-and-tube heat exchangers are tested under dry and wet conditions. The thermal fluid measurements are made using a psychrometric calorimeter. Frontal air velocity varies in the range from 0.7 m/s to 1.5 m/s. Using the experimental data, presented are heat transfer coefficients in terms of Colburn j-factors and friction factors, and these data are compared with the existing correlations.

Keywords

References

  1. Wang, C. C., Tao, W. H and Chang, C. J., 1999, An investigation of the airside performance of the slit fin-and-tube heat exchangers, Int. J. of Refrigeration, Vol. 22, pp. 595-603 https://doi.org/10.1016/S0140-7007(99)00031-6
  2. Du, Y. J and Wang, C. C., 2000, An experimental study of the air-side performance of the superslit fin-and-tube heat exchangers, Int. J. of Heat and Mass Transfer, Vol. 43, pp. 4475-4482 https://doi.org/10.1016/S0017-9310(00)00082-X
  3. Wang, C. C., Lee, W. S and Sheu, W. J., 2001, A comparative study of compact enhanced fin-andtube heat exchangers, Int. J. of Heat and Mass Transfer, Vol. 44, pp. 3565-3573 https://doi.org/10.1016/S0017-9310(01)00011-4
  4. Dejong, N. C and Jacobi, A. M., 1997, An experimental study of flow and heat transfer in parallelplate arrays: local, row-by-row and surface average behavior, Int. J. Heat and Mass Transfer, Vol. 40, pp. 1365-1378 https://doi.org/10.1016/S0017-9310(96)00186-X
  5. Nakayama, W and Xu. L. P., 1983, Enhanced fin for air cooled heat exchangers-heat transfer and friction correlation. 1st ASME/JSME. Thermal Engineering Joint Conference, pp. 495-502
  6. Sawai, S., Hayashi, T., Ohtake, Y and Takei, T., 1969, Effects of mechanical bond between fin and tube on heat transfer, Refrigeration, vol.41, No. 502, pp. 15-21
  7. Gnielinski, V., 1976, New equation for heat and mass transfer in turbulent pipe and channel flow, Int. Chem. Engineering, Vol. 16, No2, pp. 359-368
  8. Schmidt, T. E., 1949, Heat transfer calculation for extended surface, J of ASHRAE, Refrigerating Engineering, Vol.4, pp. 351-357
  9. Kim, N.H and Sim, Y.S., 2004, Reduction of the wet surface heat transfer coefficients from experimental data, Int. J. of Air-Conditioning and Refrigeration Korea, Vol. 12, pp. 37-39
  10. Mochizuki, S, Yagi, Y and Yang, W.J., 1988, Flow pattern and turbulence intensity in stacks of interrupted parallel surfaces. Experimental Thermal and Fluid Science, 1, pp. 51-57 https://doi.org/10.1016/0894-1777(88)90047-7
  11. Wang, C. C., Lin, Y. T and Lee, C. J., 2000, Heat momentum for compact louver fin-and-tube heat exchangers in wet condition, Int. J. of Heat and Mass Transfer, Vol. 43, pp. 3443-3452 https://doi.org/10.1016/S0017-9310(99)00375-0
  12. Wang, C. C., Webb, R. L and Chi, K. Y., 2000, Data reduction for air-side performance of fin-andtube heat exchangers. Experimental Thermal and Fluid Science, Vol. 21, pp. 218-226 https://doi.org/10.1016/S0894-1777(00)00005-4
  13. ASHRAE 33-87, 1987, Method of testing forced circulation air cooling and air heating coils