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A study on the evaporator of CO2 refrigerant cycle: characteristics of the heat transfer coefficient and pressure drop following mixing of CO2 and oil (PAG).

Author(s) : KATSUTA M., TAKEO N., KAMIMURA I., et al.

Type of article: Article

Summary

The effect of lubricating oil on the evaporation heat transfer characteristics and hydraulic behavior of carbon dioxide in a horizontal tube were experimentally investigated in this study. In the authors' experiment, two kinds of heating methods, namely a direct current carrying heating and an electric heater heating, are used. However, because the former method has superior experimental accuracy, the data obtained using the former method will be described and discussed. The main test section was a stainless steel tube, which was directly heated by electricity from an electric pole and mass flux, heat flux, oil concentration were adopted as experimental parameters. Finally, to take into account the oil mixing effects, the correlation of pressure drop and evaporation heat transfer characteristics were proposed. Both empirical correlations are accurate within plus or minus 30%.

Details

  • Original title: A study on the evaporator of CO2 refrigerant cycle: characteristics of the heat transfer coefficient and pressure drop following mixing of CO2 and oil (PAG).
  • Record ID : 2004-2134
  • Languages: English
  • Source: Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers - vol. 20 - n. 3
  • Publication date: 2003
  • Document available for consultation in the library of the IIR headquarters only.

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