WOLFRAM SYSTEMMODELER

BaseProperties

Moist air base properties record

Wolfram Language

In[1]:=
SystemModel["Modelica.Media.Air.MoistAir.BaseProperties"]
Out[1]:=

Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

This model computes thermodynamic properties of moist air from three independent (thermodynamic or/and numerical) state variables. Preferred numerical states are temperature T, pressure p and the reduced composition vector Xi, which contains the water mass fraction only. As an EOS the ideal gas law is used and associated restrictions apply. The model can also be used in the fog region, when moisture is present in its liquid state. However, it is assumed that the liquid water volume is negligible compared to that of the gas phase. Computation of thermal properties is based on property data of dry air and water (source: VDI-Wärmeatlas), respectively. Besides the standard thermodynamic variables absolute and relative humidity, x_water and phi, respectively, are given by the model. Upper case X denotes absolute humidity with respect to mass of moist air while absolute humidity with respect to mass of dry air only is denoted by a lower case x throughout the model. See package description for further information.

Parameters (2)

preferredMediumStates

Value: false

Type: Boolean

Description: = true if StateSelect.prefer shall be used for the independent property variables of the medium

standardOrderComponents

Value: true

Type: Boolean

Description: If true, and reducedX = true, the last element of X will be computed from the other ones

Connectors (3)

p

Type: InputAbsolutePressure

Description: Absolute pressure of medium

Xi

Type: InputMassFraction[nXi]

Description: Structurally independent mass fractions

h

Type: InputSpecificEnthalpy

Description: Specific enthalpy of medium

Components (1)

state

Type: ThermodynamicState

Description: Thermodynamic state record for optional functions

Used in Examples (2)

MoistAir

Modelica.Media.Examples

Example for moist air

PsychrometricData

Modelica.Media.Examples

Produces plot data for psychrometric charts