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WOLFRAM SYSTEM MODELER

PartialSimpleIdealGasMedium

Medium model of Ideal gas with constant cp and cv. All other quantities, e.g., transport properties, are constant.

Package Contents

	ThermodynamicState Thermodynamic state of ideal gas
	BaseProperties Base properties of ideal gas
	setState_pTX Return thermodynamic state from p, T, and X or Xi
	setState_phX Return thermodynamic state from p, h, and X or Xi
	setState_psX Return thermodynamic state from p, s, and X or Xi
	setState_dTX Return thermodynamic state from d, T, and X or Xi
	setSmoothState Return thermodynamic state so that it smoothly approximates: if x > 0 then state_a else state_b
	pressure Return pressure of ideal gas
	temperature Return temperature of ideal gas
	density Return density of ideal gas
	specificEnthalpy Return specific enthalpy
	specificInternalEnergy Return specific internal energy
	specificEntropy Return specific entropy
	specificGibbsEnergy Return specific Gibbs energy
	specificHelmholtzEnergy Return specific Helmholtz energy
	dynamicViscosity Return dynamic viscosity
	thermalConductivity Return thermal conductivity
	specificHeatCapacityCp Return specific heat capacity at constant pressure
	specificHeatCapacityCv Return specific heat capacity at constant volume
	isentropicExponent Return isentropic exponent
	velocityOfSound Return velocity of sound
	specificEnthalpy_pTX Return specific enthalpy from p, T, and X or Xi
	temperature_phX Return temperature from p, h, and X or Xi
	density_phX Return density from p, h, and X or Xi
	isentropicEnthalpy Return isentropic enthalpy
	isobaricExpansionCoefficient Returns overall the isobaric expansion coefficient beta
	isothermalCompressibility Returns overall the isothermal compressibility factor
	density_derp_T Returns the partial derivative of density with respect to pressure at constant temperature
	density_derT_p Returns the partial derivative of density with respect to temperature at constant pressure
	density_derX Returns the partial derivative of density with respect to mass fractions at constant pressure and temperature
	molarMass Returns the molar mass of the medium

Package Constants (30)

ThermoStates	Value: Modelica.Media.Interfaces.Choices.IndependentVariables.pT Type: IndependentVariables Description: Enumeration type for independent variables
mediumName	Value: "unusablePartialMedium" 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.Units.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: 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: Type: SpecificHeatCapacity (J/(kg⋅K)) Description: Medium specific gas constant
MM_const	Value: Type: MolarMass (kg/mol) Description: Molar mass
eta_const	Value: Type: DynamicViscosity (Pa⋅s) Description: Constant dynamic viscosity
lambda_const	Value: Type: ThermalConductivity (W/(m⋅K)) Description: Constant thermal conductivity
T_min	Value: Type: Temperature (K) Description: Minimum temperature valid for medium model
T_max	Value: Type: Temperature (K) Description: Maximum temperature valid for medium model
T0	Value: reference_T Type: Temperature (K) Description: Zero enthalpy temperature
fluidConstants	Value: redeclare replaceable record FluidConstants = Modelica.Media.Interfaces.Types.Basic.FluidConstants Type: FluidConstants[nS] Description: Fluid constants

Wolfram Language

In[1]:=

SystemModel["Modelica.Media.Interfaces.PartialSimpleIdealGasMedium"]

Out[1]:=

Extended by (1)

SimpleAir

Modelica.Media.Air

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