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Prediction of two-phase heat transfer in a 4-pass evaporator bundle using single tube experimental data.

Author(s) : YANIK M. K., WEBB R. L.

Type of article: Article

Summary

Two-phase heat transfer and pressure drop on the tube-side of a 4-pass R22 microfin tube bundle is modelled using experimental data on a single tube. The modelled direct expansion bundle has water flow on the shell side. The modelled bundle is divided into small axial incremental lengths along the refrigerant path. Heat transfer and pressure drop calculations are done simultaneously. The evaporation heat transfer coefficients and pressure drop are calculated using the single tube data taken at flow conditions characterizing the tube bundle. The waterside heat transfer coefficient was determined by a Wilson Plot calibration for the shell side of the tube bundle. The bundle predictions are compared with the experimental data on the modelled tube bundle. The model predicted the heat transfer for two tube bundles having different microfin tubes with less than 6% error. The simulations showed that plus or minus 5% variation from the assumed 85% dry-out vapour quality the bundle heat load varied plus or minus 3.5%. Flow maldistribution analysis showed that moderate flow maldistribution does not cause significant performance loss. A parametric analysis was performed to define the optimum number of tubes in each pass.

Details

  • Original title: Prediction of two-phase heat transfer in a 4-pass evaporator bundle using single tube experimental data.
  • Record ID : 2004-2151
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 24 - n. 5-6
  • Publication date: 2004/04

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