Overview
ABSTRACT
Cooling and heat pumps machines are called upon more and more to use mixtures as working fluids in order to replace existing ones. In comparison to pure compounds, the equilibrium between the phases of mixtures depend on the composition. In order to optimize and reduce energetic costs, it is essential to predict correctly the phase diagram, to predict the thermodynamic properties of mixtures and to be able to represent experimental data accurately by means of adapted models in any condition of use.
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Read the articleAUTHORS
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Salaheddine CHABAB: Doctorate from PSL University - Research Engineer, Mines ParisTech
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Patrice PARICAUD: Professor of Thermodynamics and Process Engineering - Doctorate from Imperial College London - Engineer from ENSIC Nancy Chemistry and Process Unit (UCP), ENSTA Paris, Paris Polytechnic Institute, Palaiseau
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Christophe COQUELET: Professor, Mines ParisTech, PSL University - Doctorate from the École des Mines de Paris - University Professor - Alumnus of ENS Cachan - ENSIACET engineer
INTRODUCTION
In the chemical, petrochemical, geochemical, pharmaceutical, refrigeration and energy industries, most unit operations involve mixtures rather than pure compounds. The thermodynamic study of fluid mixtures involved in processes or energy systems is crucial for understanding the various phenomena involved at the molecular scale, and for determining the information needed for process design, optimization and control. Compared with pure compounds, the phase equilibrium of mixtures depends on their composition. In order to optimize and reduce energy costs, it is essential to have accurate data on the thermophysical properties of mixtures, to be able to represent them accurately using suitable models, and thus to be able to calculate phase equilibria under all operating conditions. Thermodynamic models are the same as those developed for pure bodies
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KEYWORDS
phase equilibria | equations of state | activity coefficient | COSMO
Determining the thermodynamic properties of fluids
Definitions and characterizations
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