Thermodynamic Calculations

The Monitor computer program uses rigorous thermodynamic methods to simulate fluid behaviour.  Flash calculations predict the separation of a two-phase fluid into liquid and vapour and include handling of water as a separate phase.

For hydrocarbon systems there are two methods: Peng Robinson and Grayson Streed

The program defaults to Grayson Streed for Networks with assay streams and hydrogen (such as HDS units) and Peng Robinson for all other Networks. The default can be over-ridden If you wish to specify a specific method.

Thermodynamic References

D. Peng & D. B. Robinson, "A new two constant equation of state", Ind. Eng. Chem. Fundam.,16,59-64,1976

C. Chao & J. D. Seader, "A general correlation of vapor-liquid equilibria in hydrocarbon mixtures", A. I. Ch. E. J., 7, 598-605, 1961

G. Grayson & C. W. Streed, "Vapor-liquid equilibria for high temperature, high pressure hydrogen-hydrocarbon systems", Paper 20-PD7, 6th World Petroleum Conference, Frankfurt, W. Germany, 1963

Water saturation temperature and all enthalpies, specific heats and densities are from Irvine and Liley. Mayhew and Rogers is used for saturated viscosities and thermal conductivities. Sengers and Watson give the superheated viscosity and thermal conductivity.

Thomas F. Irvine Jr. & Peter E. Liley, Steam and gas tables with computer equations, Academic Press, New York, 1984

R. Mayhew & G. F. C. Rogers, Thermodynamic and Transport Properties of Fluids, Blackwell, 1969

V. Sengers & J. T. R. Watson, Improved International Formulations for the Viscosity and Thermal Conductivity of Water Substance, J. Phys. Chem. Ref. Data, Vol 15, No. 4, 1986


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