Share

An ammonia-water mixture properties correlation for efficient two-phase computations.

Author(s) : JOHNSON D. U., LEAR W. E., CRISALLE O. D., et al.

Type of article: Article

Summary

Two equations quantifying vapor-liquid equilibrium properties of ammonia-water mixtures are presented. Alternative polynomial correlations in the literature show thermodynamically inconsistent oscillatory behavior at high ammonia concentrations, and violate energy constraints because the bubble and dew lines cross and also fail to meet at pure components. This undesirable behavior can cause iterative models to diverge. A curve-fitting procedure that forces the bubble and dew lines to meet at pure-component compositions is developed and numerical techniques are employed to reduce the oscillatory behavior close to the pure-substance values. In addition, an improved data set selection is chosen by reviewing and incorporating recent literature reports. The equations presented are an improvement over prior polynomial expressions for vapor-liquid properties of the ammonia-water mixture, and are meant for industrial calculations in absorption refrigeration systems for pressures between 0.05 and 2 MPa (7.25 and 290 psia).

Details

  • Original title: An ammonia-water mixture properties correlation for efficient two-phase computations.
  • Record ID : 30008800
  • Languages: English
  • Source: HVAC&R Research - vol. 19 - n. 2
  • Publication date: 2013/02
  • DOI: http://dx.doi.org/10.1080/10789669.2012.745784

Links


See other articles in this issue (3)
See the source

Indexing