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Condensation heat-transfer and pressure drop characteristics of refrigerant R290/R600a-oil mixtures in serpentine small-diameter U-tubes.

Author(s) : WEN M. Y., HO C. Y.

Type of article: Article

Summary

Flow condensing experiments for refrigerant R290, and R600a mixed with the lubricating oil (EMKARATE RL 32H) in serpentine small-diameter (2.46 mm) U-tubes are reported. The tests were run at the saturation temperature of 40°C, vapour qualities of 0.41-0.82, mass flux of 300-600 (kg/m2.s) and inlet oil concentrations from 0 to 5 mass% oil. It was found that the condensation heat-transfer coefficients increased as mass flux values, vapour quality and the number of tube bends increased, but it decreased as the oil concentration increased. In addition, the two-phase pressure drops increased with increases in mass flux values, the number of tube bends and the oil concentration. [Reprinted with permission from Elsevier. Copyright, 2008].

Details

  • Original title: Condensation heat-transfer and pressure drop characteristics of refrigerant R290/R600a-oil mixtures in serpentine small-diameter U-tubes.
  • Record ID : 2009-1907
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 29 - n. 11-12
  • Publication date: 2009/08
  • DOI: http://dx.doi.org/10.1016/j.applthermaleng.2008.12.014

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