- Author
- Morrison, G. | McLinden, M. O.
- Title
- Application of a Hard Sphere Equation of State of Refrigerants and Refrigerant Mixtures.
- Coporate
- National Bureau of Standards, Gaithersburg, MD
- Sponsor
- Electric Power Research Institute, Palo Alto, CA
- Report
- NBS TN 1226, August 1986, 154 p.
- Distribution
- Available from National Technical Information Service
- Keywords
- equation of state | hard sphere fluid | mixing rules | mixture | phase behavior | reference states | refrigerants | thermodymamic properties
- Abstract
- This note describes the application of the Carnahan-Starling-DeSantis equation of state of halogenated hydrocarbon refrigerants and their mixtures. A complete and consistent set of thermodynamc functions is derived from the p-V-T equation of state and the perfect (ideal) gas heat capacities. A thorough discussion of reference states is included for both pure materials and their mixtures. Although this model exhibits a critical point, it does not quantitatively represent properties in the critical region. Despite this limitation, this model can represent properties in the critical region. Despite this limitation, this model can represent both liquid and gaseous mixtures away from their own critical points, even at conditions near to and above the critical points of their components. Algorithms and FORTRAN routines for the use of this model are presented along with the numerical coefficients for 11 pure refrigerants and 7 mixtures. Routines for evaluating the coefficients from saturation data are included. Several Examples of the application of this equation of state are presented to demonstrate its versatility. the average deviation from the tabulated saturation properties of the 11 pure refrigerants is 0.54% for pressures, 0.09% for liquid volumes, and 0.50% for vapor volumes. It is shown to predict other properties of pure materials well and to describe the detailed features of mixtures, both phase diagrams and thermodynamic properties.