The Importance of Including the Liquid Phase in Equations of State for Nanazeotropic Refrigerant Mixtures.
The Importance of Including the Liquid Phase in
Equations of State for Nanazeotropic Refrigerant Mixtures.
(4100
K)
Morrison, G.
Abstract:
The recent surge of interest in nonazeotropic refrigerant mixtures has
generated a need for correlation and prediction of liquid phase
information for mixtures. We show that the ideal mixture assumption
(the linear weighting of pure liquid properties) can be useful but can
also be seriously in error when one of the components is near its critical
point, even when the mixture is not near its own critical point. We also
suggest that using spline-fits to data in isolation is an ineffective way
of using such information. A physical model is suggested for a mixture
whose equation of state incoporates all of the departures of the mixture
from ideality, which allows small, isolated sets of data to be used in
predicting other physical properties of both the pure fluids and
their mixtures.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899