modelBaseProperties
Base properties (p, d, T, h, u, R, MM and, if applicable, X) of a medium
Information
Model BaseProperties is a model within package PartialMedium
and contains the declarations of the minimum number of
variables that every medium model is supposed to support.
A specific medium inherits from model BaseProperties and provides
the equations for the basic properties. Note, that in package
PartialMedium the following constants are defined:
| Type |
Name |
Description |
| String | mediumName |
Unique name of the medium (used to check whether two media in a model
are the same) |
| String | substanceNames |
Names of the mixture substances that are treated
as independent.
If medium consists of a single substance, set substanceNames=fill("",0).
If medium consists of n substances, provide either n-1 or n
substance names, depending whether mass fractions
PartialMedium.BaseProperties.X shall have
dimension PartialMedium.nX = n-1 or PartialMedium.nX = n |
| Boolean | incompressible |
= true, if density is constant; otherwise set it to false |
In every medium 3+nX equations have to be defined that
provide relations between the following 5+nX variables, declared
in model BaseProperties, where nX is the number of independent
mass fractions defined in package PartialMedium:
| Variable |
Unit |
Description |
| T |
K |
temperature |
| p |
Pa |
absolute pressure |
| d |
kg/m^3 |
density |
| h |
J/kg |
specific enthalpy |
| u |
J/kg |
specific internal energy |
| X[nX] |
kg/kg |
independent mass fractions m_i/m |
In some components, such as "Ambient", explicit equations for
medium variables are provided as "boundary conditions".
For example, the "Ambient" component may define a temperature
T_ambient.
Parameters
| Type | Name | Default | Description |
|---|
| Boolean | standardOrderComponents | true | if true, last element in components is computed from 1-sum(Xi) |
| Advanced |
| Boolean | preferredMediumStates | false | = true if StateSelect.prefer shall be used for the independent property variables of the medium |