For

example, a mixture (in moles) of 94% methane, 5% CO2, and 1% helium would be (in mole fractions): x(1)=0.94, x(3)=0.05, x(20)=0.01

Key references:

• Kunz, O. and Wagner, W. (2012) "The GERG-2008 Wide-Range Equation of State for Natural Gases and Other Mixtures; An Expansion of GERG-2004", J. Chem. Eng. Data, 57(11):3032-3091
• Kunz et al. (2007) "The GERG-2004 Wide-Range Equation of State for Natural Gases and Other Mixtures", GERG Technical Monograph 15

Note

SetupGERG() must be called once before calling other routines

Main public functions:

• MolarMassGERG() - Calculate mixture molar mass
• PressureGERG() - Calculate pressure and compressibility factor
• DensityGERG() - Calculate density iteratively
• PropertiesGERG() - Calculate thermodynamic properties
• SetupGERG() - Initialize constants and parameters

Authors

Eric W. Lemmon (NIST), Ian H. Bell (NIST), Volker Heinemann (RMG), Jason Lu (Thermo Fisher)

Copyright

Public domain (NIST work)