Aspen Physical Property System - Physical Property Models

constituents. There may be up to twenty constituents with mass percentages.
You must define these constituents, using the general component attribute
GENANAL. The equations are:
Where:
wij = Mass fraction of the jth constituent in component i
�ij s = Density of the jth consituent in component i
Parameter
Name/Element
296 4 Nonconventional Solid Property Models
Symbol MDS Default Lower
Limit
Upper
Limit
Units
DENGEN/1, 5, 9, …, 77 a i,j1 x — — — MASS-ENTHALPY
and TEMPERATURE
DENGEN/2, 6, 10, …,
78
DENGEN/3, 7, 11, …,
79
DENGEN/4, 8, 12, …,
80
a i,j2 x 0 — — MASS-ENTHALPY
and TEMPERATURE
a i,j3 x 0 — — MASS-ENTHALPY
and TEMPERATURE
a i,j4 x 0 — — MASS-ENTHALPY
and TEMPERATURE
Use the elements of GENANAL to input the mass percentages of the
constituents. The structure of DENGEN is: Elements 1 to 4 are the four
coefficients for the first constituent, elements 5 to 8 are the coefficients for
the second constitutent, and so on, for up to 20 constituents.
General Heat Capacity Polynomial
ENTHGEN is a general model that gives the specific enthalpy of any
nonconventional component as a simple mass-fraction-weighted-average for
the enthalpies of its individual constituents. You may define up to twenty
constituents with mass percentages, using the general component attribute
GENANAL. The specific enthalpy of each constituent at any temperature is
calculated by combining specific enthalpy of formation of the solid with a
sensible heat change. (See Nonconventional Component Enthalpy Calculation
in Physical Property Methods.)
The equations are:
Where: