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Heat transfer characteristics of R-410A/oil mixture flow boiling inside a 7 mm straight microfin tube.

Author(s) : HU H., DING G., WANG K.

Type of article: Article, IJR article

Summary

Two-phase heat transfer characteristics of R-410A-oil mixture flow boiling inside a straight microfin tube with the outside diameter of 7.0 mm were investigated experimentally. The experimental conditions include the evaporation temperature of 5°C, the mass flux from 200 to 400 kg/m2.s, the heat flux from 7.56 to 15.12 kW/m2, the inlet vapour quality from 0.2 to 0.7, and nominal oil concentration from 0 to 5%. The test results show that the heat transfer coefficient of R-410A-oil mixture increases with mass flux of refrigerant- oil mixture; the presence of oil enhances the heat transfer at the range of low vapour qualities); while at high vapour qualities, the presence of oil deteriorates heat transfer, and the heat transfer coefficient drops off very sharply with the increase of nominal oil concentration and vapour quality at high vapour qualities. A new correlation to predict the local heat transfer coefficient of R-410A/oil mixture flow boiling inside the straight microfin tube was developed based on local properties of refrigerant- oil mixture, and it could agree with 89% of the experimental data within the deviation of plus or minus 30%.

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Pages: 1081-1093

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Details

  • Original title: Heat transfer characteristics of R-410A/oil mixture flow boiling inside a 7 mm straight microfin tube.
  • Record ID : 2008-2450
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 31 - n. 6
  • Publication date: 2008/09

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