Abstract
The mixture of ammonia and water has been a major refrigerant
in absorption refrigeration machines for many years. Many studies have been
published on vapor-liquid equilibrium and the thermodynamic properties of
ammonia-water mixtures, including caloric properties. In this paper, a method
that combines the Gibbs free energy method for mixture properties and bubble
and dew point temperature equations for phase equilibrium is used.
This method combines the advantages of the two and avoids the
need for iterations for phase equilibrium. The proposed correlations cover high
vapor-liquid equilibrium pressures and temperatures.
Beside the fact that the investment cost is more important
compared to a compression machine, the absorption refrigeration machine is more
profitable and known as a harmless effect source over the ozone layer (CFC).
The objective of this research is:
+ The creation of a free simulation data base (flexible) allowing
the Oldham diagrams automation (Log P, -1/T) and of Merkel (Ii,
î).
+ Make a mathematic modelling of the thermo-dynamic properties of
the binary combining ammoniac-water.
Our research was carried out in open intervals: > For the
pressure from 0.1 to 50 bars.
> For the temperature from 213.15 up to 513.15 K.
Our results were compared to those of R. KUZMAN'S and those of
J.S. GALLAGHER'S, concerning the thermodynamic properties of binary couple
NH3-H2O. We had as well carried out comparison of our results with
those of BOURSEAU simulation results. For the two cases, we obtained
satisfactory results.
Key words:
Refrigerating system; absorption system; absorption diffusion
system ;simulation; ammonia- water binary solution; coefficient of performance;
heat exchangers; diagram of Oldham; diagram of Merkel.
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