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Studies on the evaporative heat transfer and pressure drop of carbon dioxide near the critical point.

Author(s) : YOON S. H., CHO E. S., KIM M. S., et al.

Summary

In recent years, carbon dioxide has gained considerable attention as an alternative refrigerant due to its excellent thermophysical properties. Many investigations of carbon dioxide as a refrigerant have included a thermodynamic cycle analysis. However, few investigations have been performed to measure heat transfer coefficients and pressure drop during evaporation of carbon dioxide. This study is aiming at providing the characteristics of heat transfer and pressure drop during the evaporation process by experiments. The test section was made of a seamless stainless steel tube with the inner diameter of 7.53 mm, and length of 5.0 m. Experiments were conducted at saturation temperatures of -4 to 20 °C, heat fluxes of 12 to 20 kW/m2 and mass fluxes of 200 to 530 kg/m2s with direct heating method. The existing correlations generally underpredicted the heat transfer coefficients and overpredicted the pressure drop. Based on the experiments for evaporation heat transfer and pressure drop, new correlations were developed in the study. Empirical correlations for the heat transfer and pressure drop have an average absolute deviation of 15.3 and 16.2% respectively.

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Details

  • Original title: Studies on the evaporative heat transfer and pressure drop of carbon dioxide near the critical point.
  • Record ID : 2004-2706
  • Languages: English
  • Source: 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
  • Publication date: 2003/08/17

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