International Journal of Air-Conditioning and Refrigeration

  • 제16권4호
  • /
  • Pages.130-136
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  • 2008
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  • 2010-1325(pISSN)
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  • 2010-1333(eISSN)
대한설비공학회 (The Society of Air-Conditioning and Refrigerating Engineers of Korea)
권호 표지

Effect of Inlet Direction on the Refrigerant Distribution in an Aluminum Flat-Tube Heat Exchanger

  • Kim, Nae-Hyun (Department of Mechanical Engineering, University of Incheon) ;
  • Kim, Do-Young (Department of Mechanical Engineering, University of Incheon) ;
  • Byun, Ho-Won (Department of Mechanical Engineering, University of Incheon) ;
  • Choi, Yong-Min (Department of Mechanical Engineering, University of Incheon)
  • 발행 : 2008.12.31
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초록

The refrigerant R-134a flow distributions are experimentally studied for a round header/ten flat tube test section simulating a brazed aluminum heat exchanger. Three different inlet orientations(parallel, normal, vertical) were investigated. Tests were conducted with downward flow for the mass flux from 70 to 130 $kg/m^2s$ and quality from 0.2 to 0.6. In the test section, tubes were flush-mounted with no protrusion into the header. It is shown that normal and vertical inlet yielded approximately similar flow distribution. At high mass fluxes or high qualities, however, slightly better results were obtained for normal inlet configuration. The flow distribution was worst for the parallel inlet configuration. Possible explanation is provided based on flow visualization results.

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참고문헌

  1. Kulkarni, T. Bullard, C. W. and Cho, K., 2004, Header design tradeoffs in microchannel evaporators, Applied Thermal Engineering, Vol. 24, pp. 759-776 https://doi.org/10.1016/j.applthermaleng.2003.10.016
  2. Webb, R. L. and Chung, K., 2004, Two-phase flow distribution in tubes of parallel flow heat exchangers, Heat Transfer Engineering, Vol. 26, pp. 3-18
  3. Hrnjak, P., 2004, Flow distribution issues in parallel flow heat exchangers, ASHRAE Annual Meeting, AN-04-1-2
  4. Lee, S. Y., 2006, Flow distribution behaviour in condensers and evaporators, Proceedings of the 13th International Heat Transfer Conference, KN-08, Sydney, Austrailia
  5. Watanabe, M., Katsuda, M. and Nagata, K., 1995, Two-phase flow distribution in multi-pass tube modeling serpentine type evaporator, ASME/JSME Thermal Engineering Conf., Vol. 2, pp. 35-42
  6. Vist, S. and Pettersen, J., 2004, Two-phase flow distribution in compact heat exchanger manifolds, Exp. Thermal Fluid Sci., Vol. 28, pp. 209-215 https://doi.org/10.1016/S0894-1777(03)00041-4
  7. Cho, H., Cho, K. and Kim, Y., 2003, Mass flow rate distribution and phase separation of R-22 in multimicrochannel tubes under adiabatic condition, 1st Int. Conf. Microchannels and Minichannels, pp. 527-533
  8. Kim, N.-H., Kim, D.-Y., Cho, J.-P., Kim, J.-O. and Park, T.-K., 2008, Effect of flow inlet or outlet direction on air-water two-phase distribution in a parallel flow heat exchanger header, Int. J. Air Conditioning Refrigeration, Vol. 16, No. 2, pp. 1-7