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Heat transfer and pressure drop during HC-600a (isobutane) condensation inside a brazed plate heat exchanger.

Author(s) : LONGO G. A.

Summary

This paper presents the heat transfer coefficients and the pressure drop measured during HC-600a (isobutane) condensation inside a brazed plate heat exchanger: the effects of saturation temperature, refrigerant mass flux and vapour super-heating are investigated. The heat transfer coefficients show weak sensitivity to saturation temperature and great sensitivity to refrigerant mass flux. At low refrigerant mass flux (< 18 kg/m2.s) the heat transfer coefficients are not dependent on mass flux and condensation is controlled by gravity. For higher refrigerant mass flux (> 18 kg/m2.s) the heat transfer coefficients depend on mass flux and forced convection condensation occurs. The condensation heat transfer coefficients of super-heated vapour are from 3 to 8% higher than those of saturated vapour. The frictional pressure drop shows a linear dependence on the kinetic energy per unit volume of the refrigerant flow and therefore a quadratic dependence on the refrigerant mass flux.

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Details

  • Original title: Heat transfer and pressure drop during HC-600a (isobutane) condensation inside a brazed plate heat exchanger.
  • Record ID : 2009-1485
  • Languages: English
  • Source: 2008 Purdue Conferences. 19th International Compressor Engineering Conference at Purdue & 12th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2008/07/14

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