Berechnung kalorischer Zustandsgrössen von Erdgasen mit der AGA8-DC92-Zustandsgleichung

Based on the AGA8-DC92 equation of state and equations for isobaric heat capacity in the ideal gas state, this paper presents a fundamental equation of state expressed in the form of Helmholtz free energy. The fundamental equation allows all caloric variables of state of natural gases in the homogeneous gas range to be calculated analytically. The caculation procedure presented is more accurate than procedures currently applied which are, for example, based on the equations of state to Benedict Webb Rubin or Peng Robinson.