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Evaporation and condensation heat transfer and pressure drop of R22 inside microfin tubes.

Author(s) : AROSIO S., MUZZIO A., NIRO A.

Summary

In-tube flow boiling and condensation experiments for R22 have been carried out on two microfin tubes of differing internal profile, and on a smooth tube. In boiling tests, the nominal saturation temperature is 5 deg C, with inlet vapour quality varying from 0.2 to 0.6. In condensation, results are for a saturation temperature equal to 35 deg C, with inlet and outlet qualities of 0.8 and 0.2 respectively. Both microfin tubes show a substantial increase in the heat transfer coefficient penalized by a small increase of pressure drops. The enhancement factor turned out to be decreasing with increasing mass flow rates.

Details

  • Original title: Evaporation and condensation heat transfer and pressure drop of R22 inside microfin tubes.
  • Record ID : 1997-0743
  • Languages: English
  • Source: Proceedings of the 2nd European Thermal-Sciences (EUROTHERM) and 14th UIT National Heat Transfer Conference 1996.
  • Publication date: 1996/05/29
  • Document available for consultation in the library of the IIR headquarters only.

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