GERG-2008 and EOS-CG¶

This report combines experimental validation of GERG-2008 compressibility factors with equation verification of the six-component EOS-CG model. The optional teqp path exercises the complete residual models; it crosses a CPU/NumPy boundary and is not a differentiable native PyTorch calculation.

GERG-2008 compressibility¶

Measured and GERG-2008 compressibility factors

The measured markers and model values cover the reported pressure series for the nitrogen/methane/ethane/propane mixture. Agreement should be interpreted within the printed precision of the source table.

EOS-CG binary-state verification¶

EOS-CG pressure parity and residuals

The parity and residual panels cover the low- and high-density states for all binary pairs among CO2, water, nitrogen, oxygen, argon, and carbon monoxide in the published computer-program verification table. This is verification against model-calculation values, not experimental validation.

Sources: Kunz and Wagner (2012), GERG-2008; Pedersen, Christensen, and Shaikh (2024), Table 7.20; and Gernert and Span (2016), EOS-CG Table 8.