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Flooded boiling of ammonia with miscible oil outside a horizontal plain tube.

Author(s) : ZHENG J. X., JIN G. P., CHYU M. C.

Type of article: Article

Summary

The experiment covered saturation temperature from -23 to 7°C and heat flux up to 60 kW/m2 [19,000 Btu/(h.ft2)]. Under a particular saturation temperature and heat flux, the heat transfer coefficient generally first decreased with an increase in oil concentration up to 5%. This increase was then followed by an insignificant increase in the coefficient with a further increase in oil concentration to 10%. At a low temperature and a high heat flux, the heat transfer coefficient decreased with the lubricant concentration and stayed constant. The effect of miscible lubricant strongly depends on saturation temperature and weakly depends on heat flux. The largest degradation occurs at the present low temperature of -23 °C where the heat transfer coefficient can be reduced by up to 33%. A general correlation was developed for heat transfer coefficients both with and without lubricant effect.

Details

  • Original title: Flooded boiling of ammonia with miscible oil outside a horizontal plain tube.
  • Record ID : 2002-1247
  • Languages: English
  • Source: HVAC&R Research - vol. 7 - n. 2
  • Publication date: 2001/04

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