Fluid properties calculation using GERG-2008 library

The program includes a special module for the refined calculation of the properties and phase equilibria of natural gases GERG-2008, developed by Prof. Dr.-Ing. Wolfgang Wagner of Ruhr-University Bochum and his colleagues.

GERG-2008 software allows to calculate natural gas thermodynamic properties and phase equilibria basing on popular GERG-2008 equation of state. This equation (also developed by Prof. Wagner and his colleagues) provides the most precise estimation of more than 20 thermodynamic properties of natural gas components mixtures. These mixtures can be composed of any of the 21 natural gas components (methane, ethane, propane, n- and iso- butane, n- and iso- pentane, hexane, heptane, octane, nonane, decane, hydrogen, oxygen, nitrogen, carbon monoxide, carbon dioxide, hydrogen sulfide, water, helium and argon). This equation of state may be used in a wide temperature (from 60 to 700 K) and pressure ranges (to about 70 MPa). The domain of application of this equation covers both liquid and vapor phases and also gas-liquid and supercritical fluids.

GERG-2008 equation is widely used in natural gas industry but however it is not recommended to use it for another type of mixtures (such as cryogenic industry fluids with high He and H2 concentration or aqueous solutions of gases).

Version of GERG-2008 software that included in Hydrosystem is adopted and optimized for using in process simulation software and fluid flow calculation software. More detailed information on calculation methods is provided in the documentation for the GERG-2008 program and in [1-2].

References

1. Kunz, O., Wagner, W. The GERG-2008 wide-range equation of state for natural gases and other mixtures: An expansion of GERG-2004. J. Chem. Eng. Data, 2012, V.57, pp. 3032-3091.

2. Kunz, O., Klimeck, R., Wagner, W., Jaeschke, M. The GERG-2004 wide-range equation of state for natural gases and other mixtures. GERG TM15 2007. Fortschr.-Ber. VDI, Reihe 6, Nr. 557, VDI Verlag, Düsseldorf, 2007; also available as GERG Technical Monograph 15 (2007).

The list of substances available in the GERG-2008 library is given below:

Pure substances

Nitrogen

Argon

Butane                                 

Water, steam

Hydrogen

Hexane

Helium

Heptane                              

Carbon dioxide                     

Decane

Isobutane

Isopentane

Oxygen

Methane

Nonane

Carbon monoxide                       

Octane

Pentane

Propane

Hydrogen sulfide

Ethan