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Evaporation of CO2 in a horizontal smooth tube.

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

Summary

Flow boiling heat transfer coefficients of CO2 were measured in a horizontal smooth tube with inner diameter 6.1 mm. The characteristics of CO2 flow boiling is explained by CO2 properties and flow patterns. The measured CO2 heat transfer coefficients were compared with other published data. Experiments with R22 were also conducted in the same system and the results show that the heat transfer coefficients for CO2 are 40 to 150% higher than for R22. The CO2 heat transfer coefficients presented indicate the reduction in the heat transfer coefficient as mass flux increases at low-quality regions and also show that dryout does not occur until the high-quality region of 0.8, for mass fluxes of 200 and 400 kg/m2.s. The Gungor and Winterton correlation gives relatively good agreement with measured data; however it deviates more at lower evaporation temperature and high mass flux conditions.

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Pages: 2005-3

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Details

  • Original title: Evaporation of CO2 in a horizontal smooth tube.
  • Record ID : 2006-0582
  • Languages: English
  • Source: Commercial Refrigeration. Thermophysical Properties and Transfer Processes of Refrigerants. Proceedings of the IIR International Conferences.
  • Publication date: 2005/08/02

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