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      The effect of inlet conditions on the air side hydraulic resistance and flow maldistribution in industrial air heaters

      Hoffmann-Vocke, Jonas; Neale, James R.; Walmsley, Michael R.W.
      DOI
       10.1016/j.ijheatfluidflow.2011.05.002
      Link
       www.sciencedirect.com
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      Hoffmann-Vocke, J., Neale, J. & Walmsley, M.R.W. (2011). The effect of inlet conditions on the air side hydraulic resistance and flow maldistribution in industrial air heaters. International Journal of Heat and Fluid Flow, 32(4), 834-845.
      Permanent Research Commons link: https://hdl.handle.net/10289/5461
      Abstract
      Experimental system hydraulic resistance measurements on a scale air heater unit have highlighted the excessive hydraulic resistance of typical industry configurations. Both poor header inlet conditions and large header expansion angles are shown to contribute to system hydraulic resistance magnitudes 20–100% higher than suitable benchmark cases. Typical centrifugal fan system efficiencies well under 80% multiply the system resistance effects resulting in larger fan power penalties. Velocity profile measurements taken upstream and downstream of the test heat exchanger under flow maldistribution conditions provide insight into the flow maldistribution spreading caused by the heat exchanger resistance. The anisotropic resistance of the plate fin-and-tube heat exchanger is shown to result in resistance induced flow dispersion being concentrated in the axis parallel to the plate fins.
      Date
      2011
      Type
      Journal Article
      Publisher
      Elsevier
      Collections
      • Science and Engineering Papers [3122]
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