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Optimum circuit tube length and pressure drop on the refrigerant side of evaporators.

Author(s) : GRANRYD E.

Summary

A simple equation is derived to establish conditions for optimum pressure drop -corresponding to an optimum circuit tube length and exit vapor velocity -for evaporators. Provided that the influence of the tube length on the heat transfer and the pressure drop is known the result is general in its validity. For smooth tubes the relations of Pierre indicate that the optimum pressure drop (expressed as a drop of saturation temperature) is about 1/4 of the mean temperature difference between wall and refrigerant. Finally tubes with heat transfer enhancement devices are discussed briefly. No consideration has been made to account for the influence of improper refrigerant distribution to different circuits which sometimes is a major problem in practice.

Details

  • Original title: Optimum circuit tube length and pressure drop on the refrigerant side of evaporators.
  • Record ID : 1993-0216
  • Languages: English
  • Publication date: 1992/07/14
  • Source: Source: Proc. 1992 int. Refrig. Conf., Energy Effic. New Refrig., Purdue Univ.
    vol. 1; 73-82; 8 fig.; 5 ref.
  • Document available for consultation in the library of the IIR headquarters only.

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