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Experimental studies on the evaporative heat transfer characteristics of CO2-propane mixtures in smooth and micro-fin tubes with diameter of 5 mm.

Author(s) : CHO J. M., LEE J. S., KIM Y. J., et al.

Summary

Because of environmental issues caused by CFC, HCFC or HFC refrigerants, new alternative refrigerants have gained a significant attention. In-tube evaporation heat transfer characteristics of CO2-propane mixtures were experimentally investigated and analyzed at several conditions of mass fluxes, heat fluxes, compositions of CO2-propane refrigerant mixtures and tube geometry. Heat transfer coefficient data during evaporation process of CO2-propane mixtures were measured for 5 m long smooth and micro-fin tubes with outer diameters of 5 mm. The tests were conducted at mass fluxes of 318 to 530 kg/m2.s, heat fluxes of 12 to 20 kW/m2 and for several mixture compositions (100/0, 75/25, 50/50, 25/75, 100/0 by wt% of CO2-propane). The differences of heat transfer characteristics between smooth and micro-fin tubes for various compositions of CO2-propane refrigerant mixtures and the effect of mass flux, heat flux, and evaporation temperature on enhancement factor (EF) and penalty factor (PF) were presented.

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Pages: ICR07-B1-1128

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Details

  • Original title: Experimental studies on the evaporative heat transfer characteristics of CO2-propane mixtures in smooth and micro-fin tubes with diameter of 5 mm.
  • Record ID : 2007-2478
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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