|
PC Model
|
|
The phase-change (PC) model is
based on the saturation and super-heated
tables and is generally quite accurate. Sub-cooled liquid is modeled with the compressed-liquid sub-model, except for H2O*, which uses compressed liquid table for high accuracy.
Working fluids such as H2O, R-12, NH3, R-134a, N2, CO2,
etc., should be treated as PC fluids if there is any possibility of a phase
transformation. |
|
SL Model
|
 |
Constant density
and specific heats (c_p=c_v=c)
characterize the solid/liquid (SL) model.
Beside a wide selection to choose
from, a new solid or liquid can be created by assigning custom material
properties. |
| Gases: |
PG Model |
 |
The perfect gas
(PG) model obeys the ideal gas equation (pv=RT). However, the
specific heats are assumed
constants.
Beside a wide selection, new gases can be created by assigning custom
material properties. A perfect gas can be considered as a simplified ideal gas. |
| IG Model |
 |
An ideal gas
(IG) model obeys the ideal gas equation
(pv=RT). Specific heats are temperature dependent. As a result the IG model is more accurate than the PG model when variation in temperature is large. Choose from an wide
selection of gases. |
| RG Model |
 |
Based on the generalized compressibility chart (pv=ZRT), the real gas
(RG) model can handle a large number
of fluids in their liquid, vapor or gaseous states. But generality
comes
at the expense of accuracy. |
|
Binary
Mixture
The mixture of two gases,
A and B, is expressed
in terms of the mass or mole fraction of gas-A. |
PG+PG
Model
|
IG+IG
Model
|
RG+RG
Model
|
MoistAir
(PG+PG+PC) |
|
General
Mixture
Mixture can contain
any number of species
from 1 to n (n>60). |
n-PG Model |
n-IG Model |
|
Ideal Gas Equilibrium Mixture
Mixture can contain
any number of species. However, the state is based on either (a) specified frozen composition, or (b) equilibrium composition based on Gibbs function minimization. The IGE model can be used for calculating equilibrium constant for a stoichiometric reaction at any given pressure and temperature. |
IGE Model |
 |
