IDEAL-GAS THERMODYNAMIC PROPERTIES FOR NATURAL-GAS APPLICATIONS

Calculating caloric properties from a thermal equation of state requir es information such as isobaric heat capacities in the ideal-gas state as a function of temperature. In this work, values for the parameters of the c(p)(0) correlation proposed by Aly and Lee were newly determi ned for 21 pure gases which are compounds of natural gas mixtures. The values of the parameters were adjusted to selected c(p)(0) data calcu lated from spectroscopic data for temperatures ranging from 10 to 1000 K. The data sources used are discussed and compared with literature d ata deduced from theoretic models and caloric measurements. The parame ters presented will be applied in a current GERG project for evaluatin g equations of state (e.g., the AGA 8 equation) for their suitability for calculating caloric properties.