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CO2 and R-410A flow boiling heat transfer and pressure drop at low temperatures in a horizontal smooth tube.

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

Summary

Flow boiling heat transfer coefficient and pressure drop are investigated in the horizontal smooth tube of 6.1 mm inner diameter for CO2, R-410A, and R-22. Flow boiling heat transfer coefficients are measured at the constant wall temperature conditions, while pressure drop measurement is carried out at adiabatic conditions. This research is performed at evaporation temperatures of -15 and -30°C, mass flux from 100 to 400 kg/m2.s, and heat flux from 5 to 15 kW/m2 for vapour qualities ranging from 0.1 to 0.8. The measured R-410A heat transfer coefficients are compared to other published data. The comparison of heat transfer coefficients for CO2, R-410A, and R-22 is presented at various heat fluxes, mass fluxes, and evaporation temperatures. The Wattelet et al. (1994), and Gungor and Winterton (1986) correlations give the best agreement with the measured heat transfer coefficients for CO2 and R-410A. Pressure drop for CO2, R-410A, and R-22 at various mass fluxes, evaporation temperatures and qualities is presented in this paper. The Müller-Steinhagen and Heck (1986), and Friedel (1979) correlations can predict the measured pressure drop relatively well.

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Details

  • Original title: CO2 and R-410A flow boiling heat transfer and pressure drop at low temperatures in a horizontal smooth tube.
  • Record ID : 2008-2004
  • Languages: English
  • Source: 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2006/07/17

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