WOLFRAM SYSTEMMODELER

SimpleAir

Air: Simple dry air model (0..100 degC)

Package Constants (31)

ThermoStates

Value: Modelica.Media.Interfaces.Choices.IndependentVariables.pT

Type: IndependentVariables

Description: Enumeration type for independent variables

mediumName

Value: "SimpleAir"

Type: String

Description: Name of the medium

substanceNames

Value: {mediumName}

Type: String[:]

Description: Names of the mixture substances. Set substanceNames={mediumName} if only one substance.

extraPropertiesNames

Value: fill("", 0)

Type: String[:]

Description: Names of the additional (extra) transported properties. Set extraPropertiesNames=fill("",0) if unused

singleState

Value: false

Type: Boolean

Description: = true, if u and d are not a function of pressure

reducedX

Value: true

Type: Boolean

Description: = true if medium contains the equation sum(X) = 1.0; set reducedX=true if only one substance (see docu for details)

fixedX

Value: true

Type: Boolean

Description: = true if medium contains the equation X = reference_X

reference_p

Value: 101325

Type: AbsolutePressure (Pa)

Description: Reference pressure of Medium: default 1 atmosphere

reference_T

Value: 298.15

Type: Temperature (K)

Description: Reference temperature of Medium: default 25 deg Celsius

reference_X

Value: fill(1 / nX, nX)

Type: MassFraction[nX] (kg/kg)

Description: Default mass fractions of medium

p_default

Value: 101325

Type: AbsolutePressure (Pa)

Description: Default value for pressure of medium (for initialization)

T_default

Value: Modelica.SIunits.Conversions.from_degC(20)

Type: Temperature (K)

Description: Default value for temperature of medium (for initialization)

h_default

Value: specificEnthalpy_pTX(p_default, T_default, X_default)

Type: SpecificEnthalpy (J/kg)

Description: Default value for specific enthalpy of medium (for initialization)

X_default

Value: reference_X

Type: MassFraction[nX] (kg/kg)

Description: Default value for mass fractions of medium (for initialization)

C_default

Value: fill(0, nC)

Type: ExtraProperty[nC]

Description: Default value for trace substances of medium (for initialization)

nS

Value: size(substanceNames, 1)

Type: Integer

Description: Number of substances

nX

Value: nS

Type: Integer

Description: Number of mass fractions

nXi

Value: if fixedX then 0 else if reducedX then nS - 1 else nS

Type: Integer

Description: Number of structurally independent mass fractions (see docu for details)

nC

Value: size(extraPropertiesNames, 1)

Type: Integer

Description: Number of extra (outside of standard mass-balance) transported properties

C_nominal

Value: 1.0e-6 * ones(nC)

Type: Real[nC]

Description: Default for the nominal values for the extra properties

cp_const

Value: 1005.45

Type: SpecificHeatCapacity (J/(kg·K))

Description: Constant specific heat capacity at constant pressure

cv_const

Value: cp_const - R_gas

Type: SpecificHeatCapacity (J/(kg·K))

Description: Constant specific heat capacity at constant volume

R_gas

Value: Constants.R / 0.0289651159

Type: SpecificHeatCapacity (J/(kg·K))

Description: Medium specific gas constant

MM_const

Value: 0.0289651159

Type: MolarMass (kg/mol)

Description: Molar mass

eta_const

Value: 1.82e-5

Type: DynamicViscosity (Pa·s)

Description: Constant dynamic viscosity

lambda_const

Value: 0.026

Type: ThermalConductivity (W/(m·K))

Description: Constant thermal conductivity

T_min

Value: Cv.from_degC(0)

Type: Temperature (K)

Description: Minimum temperature valid for medium model

T_max

Value: Cv.from_degC(100)

Type: Temperature (K)

Description: Maximum temperature valid for medium model

T0

Value: reference_T

Type: Temperature (K)

Description: Zero enthalpy temperature

fluidConstants

Value: airConstants

Type: FluidConstants[nS]

Description: Fluid constants

airConstants

Value: {Modelica.Media.Interfaces.Types.Basic.FluidConstants(iupacName = "simple air", casRegistryNumber = "not a real substance", chemicalFormula = "N2, O2", structureFormula = "N2, O2", molarMass = Modelica.Media.IdealGases.Common.SingleGasesData.N2.MM)}

Type: FluidConstants[nS]

Description: Constant data for the fluid

Information

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

Simple Ideal gas air model for low temperatures

This model demonstrates how to use the PartialSimpleIdealGas base class to build a simple ideal gas model with a limited temperature validity range.

Wolfram Language

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