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CO2 condensation heat transfer and pressure drop in multi-port microchannels.

Author(s) : PARK C. Y., HRNJAK P.

Summary

CO2 flow condensation heat transfer coefficients and pressure drop are investigated for 0.89 mm microchannels at horizontal flow conditions. They were measured at saturation temperatures of -15 and -25°C, mass fluxes from 200 to 800 kg/m2.s, and wall subcooling temperatures from 2 to 4°C. Measured heat transfer coefficients increased with the increase of mass fluxes and vapour qualities, whereas they were almost independent of wall subcooling temperature changes. Several correlations could predict heat transfer coefficients within acceptable error range, and from this comparison, it could be inferred that the flow condensation mechanism in 0.89 mm channels should be similar to that in large tubes. CO2 two-phase pressure drop, measured in adiabatic conditions, increased with the increase of mass flux and vapor quality, and it decreased with the increase of saturation temperature. By comparing measured pressure drop with calculated values, it was shown that several correlations could predict the measured values relatively well.

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Pages: 2009-5

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Details

  • Original title: CO2 condensation heat transfer and pressure drop in multi-port microchannels.
  • Record ID : 2009-1969
  • Languages: English
  • Source: 3rd Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Publication date: 2009/06/23

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