Ideal-gas thermodynamic properties for natural-gas applications

Calculating caloric properties from a thermal equation of state requires information such as isobaric heat capacities in the ideal-gas state as a function of temperature. In this work, values for the parameters of thecp0 correlation proposed by Aly and Lee were newly determined for 21 pure gases which are compounds of natural gas mixtures. The values of the parameters were adjusted to selectedcp0 data calculated from spectroscopic data for temperatures ranging from 10 to 1000 K. The data sources used are discussed and compared with literature data deduced from theoretic models and caloric measurements. The parameters presented will be applied in a current GERG project for evaluating equations of state (e.g., the AGA 8 equation) for their suitability for calculating caloric properties.

[1]  U. Hochberg,et al.  Flow-calorimetric results for the specific heat capacity cp of CO2, of C2H6, and of (0.5CO2 + 0.5C2H6) at high pressures , 1989 .

[2]  A. Goodwin,et al.  Speeds of sound, perfect-gas heat capacities, and acoustic virial coefficients for methane determined using a spherical resonator at temperatures between 255 K and 300 K and pressures in the range 171 kPa to 7.1 MPa , 1992 .

[3]  Kenneth E. Starling,et al.  Sound Speed Of Natural Gas , 1988 .

[4]  G. Ernst,et al.  Ideal and real gas state heat capacities Cp of C3H8, i-C4H10, CH2ClCF3, CF2ClCFCl2, and CHF2Cl , 1970 .

[5]  A. Goodwin,et al.  Thermophysical properties of alkanes from speeds of sound determined using a spherical resonator 2. n-Butane , 1988 .

[6]  J. Trusler,et al.  Second acoustic virial coefficients of nitrogen between 80 and 373 K , 1992 .

[7]  R. McDowell,et al.  Thermodynamic Functions of Methane. , 1963 .

[8]  V. V. Sychev,et al.  Thermodynamic Properties of Nitrogen , 1987 .

[9]  D. W. Scott.  Correlation of the chemical thermodynamic properties of alkane hydrocarbons , 1974 .

[10]  B. P. Dailey,et al.  The Heat Capacities at Higher Temperatures of Ethane and Propane1 , 1943 .

[11]  G. Maurer,et al.  Flow calorimeter for the accurate determination of the isobaric heat capacity at high pressures; results for carbon dioxide , 1989 .

[12]  J. Trusler,et al.  The speed of sound and derived thermodynamic properties of methane at temperatures between 275 K and 375 K and pressures up to 10 MPa , 1992 .

[13]  Lloyd L. Lee,et al.  SELF-CONSISTENT EQUATIONS FOR CALCULATING THE IDEAL GAS HEAT CAPACITY, ENTHALPY, AND ENTROPY , 1981 .

[14]  H. D. Baehr,et al.  Thermodynamische Funktionen idealer Gase für Temperaturen bis 6000 °K , 1968 .

[15]  B. Zwolinski,et al.  Ideals gas thermodynamic properties and isomerization of n‐butane and isobutane , 1975 .

[16]  S. Angus.  Water and Steam: Their properties and current industrial applications ? and ? (editors), Pergamon Press, 1980, xx + 684 pp. price £45.00 , 1981 .

[17]  J. Chao,et al.  Ideal Gas Thermodynamic Properties of Ethane and Propane , 1973 .

[18]  G. B. Kistiakowsky,et al.  The Low Temperature Gaseous Heat Capacities of Certain C3 Hydrocarbons , 1940 .

[19]  Y. S. Touloukian,et al.  Tables of thermal properties of gases , 1955 .

[20]  G. B. Skinner,et al.  Ideal Gas Thermodynamic Properties of CH3, CD3, CD4, C2D2, C2D4, C2D6, C2H6, CH3N2CH3, and CD3N2CD3 , 1982 .

[21]  G. B. Kistiakowsky,et al.  Gaseous Heat Capacities. II , 1940 .