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On the design of vertical risers from ammonia recirculation type evaporators.

Author(s) : HAUKÅS H. T.

Summary

Design criteria for vertical risers carrying two-phase ammonia flow include minimized pressure drop at stable flow conditions and prevention of flow and pressure oscillations, particularly at reduced load. Estimates for optimum vapour velocities with respect to pressure drop in vertical upward two-phase flow are available. A method to calculate the magnitude of the vertical pressure gradient is proposed. While these velocities may serve as design criterion for high riser systems (e.g. 4-5 m) at moderate evaporation temperatures, lower velocities should be applied in low temperature systems with less riser heights, due to greater relative significance of the other pressure drop components in the riser system.

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Pages: 2005-2

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Details

  • Original title: On the design of vertical risers from ammonia recirculation type evaporators.
  • Record ID : 2006-1160
  • Languages: English
  • Source: Ammonia Refrigerating Systems, Renewal and Improvement.
  • Publication date: 2005/05/06

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