Aspen Physical Property System - Physical Property Models

where R is the gas constant.
Linear extrapolation of Cp *,ig versus T is performed outside temperature
bounds.
Parameter
Name/Element
222 2 Thermodynamic Property Models
Symbol Default MDS Lower
Limit
Upper
Limit
Units
CPIGDS/1 C 1i — — — — TEMPERATURE
CPIGDS/2, …, 8 C 2i, ..., C 8i 0 — — — —
CPIGDS/9 C 9i 0 — — — TEMPERATURE
CPIGDS/10 C 10i 1000 — — — TEMPERATURE
IK-CAPE Heat Capacity Polynomial
The equation is:
Linear extrapolation of Cp *,ig versus T is performed outside temperature
bounds.
Parameter
Name/Element
Symbol Default MDS Lower
Limit
Upper
Limit
Units
CPIGPO/1 C 1i — X — — MOLE-CAPACITY
CPIGPO/2,…,10 C 2i, ..., C 10i 0 X — — MOLE-CAPACITY
TEMPERATURE
CPIGPO/11 C 11i 0 X — — TEMPERATURE
CPIGPO/12 C 12i 1000 X — — TEMPERATURE
References
Data for the Ideal Gas Heat Capacity Polynomial: Reid, Prausnitz and Poling,
The Properties of Gases and Liquids, 4th ed., (New York: McGraw-Hill, 1987).
The Aspen Physical Property System combustion data bank, JANAF
Thermochemical Data, Compiled and calculated by the Thermal Research
Laboratory of Dow Chemical Company.
F. A. Aly and L. L. Lee, "Self-Consistent Equations for Calculating the Ideal
Gas Heat Capacity, Enthalpy, and Entropy, Fluid Phase Eq., Vol. 6, (1981), p.
169.