packagePartialMedium
Partial medium properties (base package of all media packages)
Extends from Modelica.Media.Interfaces.Types (Types to be used in fluid models), Modelica.Icons.MaterialPropertiesPackage (Icon for package containing property classes).
Information
PartialMedium is a package and contains all declarations for a medium. This means that constants, models, and functions are defined that every medium is supposed to support (some of them are optional). A medium package inherits from PartialMedium and provides the equations for the medium. The details of this package are described in Modelica.Media.UsersGuide.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Media.Interfaces.Choices.IndependentVariables | ThermoStates | Enumeration type for independent variables | |
| String | mediumName | "unusablePartialMedium" | Name of the medium |
| String[:] | substanceNames | {mediumName} | Names of the mixture substances. Set substanceNames={mediumName} if only one substance. |
| String[:] | extraPropertiesNames | fill("", 0) | Names of the additional (extra) transported properties. Set extraPropertiesNames=fill("",0) if unused |
| Boolean | singleState | = true, if u and d are not a function of pressure | |
| Boolean | reducedX | true | = true, if medium contains the equation sum(X) = 1.0; set reducedX=true, if only one substance (see docu for details) |
| Boolean | fixedX | false | = true, if medium contains the equation X = reference_X |
| AbsolutePressure | reference_p | 101325 | Reference pressure of Medium: default 1 atmosphere |
| Temperature | reference_T | 298.15 | Reference temperature of Medium: default 25 deg Celsius |
| MassFraction[nX] | reference_X | fill(1/nX, nX) | Default mass fractions of medium |
| AbsolutePressure | p_default | 101325 | Default value for pressure of medium (for initialization) |
| Temperature | T_default | Modelica.Units.Conversions.from_degC(20) | Default value for temperature of medium (for initialization) |
| SpecificEnthalpy | h_default | specificEnthalpy_pTX(p_default, T_default, X_default) | Default value for specific enthalpy of medium (for initialization) |
| MassFraction[nX] | X_default | reference_X | Default value for mass fractions of medium (for initialization) |
| ExtraProperty[nC] | C_default | fill(0, nC) | Default value for trace substances of medium (for initialization) |
| Integer | nS | size(substanceNames, 1) | Number of substances |
| Integer | nX | nS | Number of mass fractions |
| Integer | nXi | if fixedX then 0 else if reducedX then nS - 1 else nS | Number of structurally independent mass fractions (see docu for details) |
| Integer | nC | size(extraPropertiesNames, 1) | Number of extra (outside of standard mass-balance) transported properties |
| Real[nC] | C_nominal | 1.0e-6*ones(nC) | Default for the nominal values for the extra properties |
Contents
| Name | Description |
|---|---|
 FluidConstants | Critical, triple, molecular and other standard data of fluid |
 ThermodynamicState | Minimal variable set that is available as input argument to every medium function |
 BaseProperties | Base properties (p, d, T, h, u, R_s, MM and, if applicable, X and Xi) of a medium |
 setState_pTX | Return thermodynamic state as function of p, T and composition X or Xi |
 setState_phX | Return thermodynamic state as function of p, h and composition X or Xi |
 setState_psX | Return thermodynamic state as function of p, s and composition X or Xi |
 setState_dTX | Return thermodynamic state as function of d, T and composition X or Xi |
 setSmoothState | Return thermodynamic state so that it smoothly approximates: if x > 0 then state_a else state_b |
 dynamicViscosity | Return dynamic viscosity |
 thermalConductivity | Return thermal conductivity |
 prandtlNumber | Return the Prandtl number |
 pressure | Return pressure |
 temperature | Return temperature |
 density | Return density |
 specificEnthalpy | Return specific enthalpy |
 specificInternalEnergy | Return specific internal energy |
 specificEntropy | Return specific entropy |
 specificGibbsEnergy | Return specific Gibbs energy |
 specificHelmholtzEnergy | Return specific Helmholtz energy |
 specificHeatCapacityCp | Return specific heat capacity at constant pressure |
| heatCapacity_cp | Alias for deprecated name |
 specificHeatCapacityCv | Return specific heat capacity at constant volume |
| heatCapacity_cv | Alias for deprecated name |
 isentropicExponent | Return isentropic exponent |
 isentropicEnthalpy | Return isentropic enthalpy |
 velocityOfSound | Return velocity of sound |
 isobaricExpansionCoefficient | Return overall the isobaric expansion coefficient beta |
| beta | Alias for isobaricExpansionCoefficient for user convenience |
 isothermalCompressibility | Return overall the isothermal compressibility factor |
| kappa | Alias of isothermalCompressibility for user convenience |
 density_derp_h | Return density derivative w.r.t. pressure at constant specific enthalpy |
 density_derh_p | Return density derivative w.r.t. specific enthalpy at constant pressure |
 density_derp_T | Return density derivative w.r.t. pressure at constant temperature |
 density_derT_p | Return density derivative w.r.t. temperature at constant pressure |
 density_derX | Return density derivative w.r.t. mass fraction |
 molarMass | Return the molar mass of the medium |
 specificEnthalpy_pTX | Return specific enthalpy from p, T, and X or Xi |
 specificEntropy_pTX | Return specific entropy from p, T, and X or Xi |
 density_pTX | Return density 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 |
 temperature_psX | Return temperature from p, s, and X or Xi |
 density_psX | Return density from p, s, and X or Xi |
 specificEnthalpy_psX | Return specific enthalpy from p, s, and X or Xi |
 massFraction | Return independent mass fractions (if any) |
| MassFlowRate | Type for mass flow rate with medium specific attributes |