Package Modelica.Media.Air.MoistAir
Air: Moist air model (190 ... 647 K)

Information

Thermodynamic Model

This package provides a full thermodynamic model of moist air including the fog region and temperatures below zero degC. The governing assumptions in this model are:

the perfect gas law applies
water volume other than that of steam is neglected

All extensive properties are expressed in terms of the total mass in order to comply with other media in this library. However, for moist air it is rather common to express the absolute humidity in terms of mass of dry air only, which has advantages when working with charts. In addition, care must be taken, when working with mass fractions with respect to total mass, that all properties refer to the same water content when being used in mathematical operations (which is always the case if based on dry air only). Therefore two absolute humidities are computed in the BaseProperties model: X denotes the absolute humidity in terms of the total mass while x denotes the absolute humidity per unit mass of dry air. In addition, the relative humidity phi is also computed.

At the triple point temperature of water of 0.01 °C or 273.16 K and a relative humidity greater than 1 fog may be present as liquid and as ice resulting in a specific enthalpy somewhere between those of the two isotherms for solid and liquid fog, respectively. For numerical reasons a coexisting mixture of 50% solid and 50% liquid fog is assumed in the fog region at the triple point in this model.

Range of validity

From the assumptions mentioned above it follows that the pressure should be in the region around atmospheric conditions or below (a few bars may still be fine though). Additionally a very high water content at low temperatures would yield incorrect densities, because the volume of the liquid or solid phase would not be negligible anymore. The model does not provide information on limits for water drop size in the fog region or transport information for the actual condensation or evaporation process in combination with surfaces. All excess water which is not in its vapour state is assumed to be still present in the air regarding its energy but not in terms of its spatial extent.

The thermodynamic model may be used for temperatures ranging from 190 ... 647 K. This holds for all functions unless otherwise stated in their description. However, although the model works at temperatures above the saturation temperature it is questionable to use the term "relative humidity" in this region. Please note, that although several functions compute pure water properties, they are designed to be used within the moist air medium model where properties are dominated by air and steam in their vapor states, and not for pure liquid water applications.

Transport Properties

Several additional functions that are not needed to describe the thermodynamic system, but are required to model transport processes, like heat and mass transfer, may be called. They usually neglect the moisture influence unless otherwise stated.

Application

The model's main area of application is all processes that involve moist air cooling under near atmospheric pressure with possible moisture condensation. This is the case in all domestic and industrial air conditioning applications. Another large domain of moist air applications covers all processes that deal with dehydration of bulk material using air as a transport medium. Engineering tasks involving moist air are often performed (or at least visualized) by using charts that contain all relevant thermodynamic data for a moist air system. These so called psychrometric charts can be generated from the medium properties in this package. The model PsychrometricData may be used for this purpose in order to obtain data for figures like those below (the plotting itself is not part of the model though).

Legend: blue - constant specific enthalpy, red - constant temperature, black - constant relative humidity

Extends from Modelica.Media.Interfaces.PartialCondensingGases (Base class for mixtures of condensing and non-condensing gases).

Package Contents

Name	Description
`AbsolutePressure`	Type for absolute pressure with medium specific attributes
`BaseProperties`	Moist air base properties record
`Basic` …	The most basic version of a record used in several degrees of detail
`beta`	Alias for isobaricExpansionCoefficient for user convenience
`Choices` …
`CumulativeExtraProperty`	Type for conserved integral of unspecified, mass specific property
`Density`	Type for density with medium specific attributes
`density`	Returns density of ideal gas as a function of the thermodynamic state record
`density_derh_p`
`density_derp_h`
`density_derp_T`
`density_derT_p`
`density_derX`
`density_phX`	Return density from p, h, and X or Xi
`density_psX`	Return density from p, s, and X or Xi
`density_pTX`	Return density from p, T, and X or Xi
`DerDensityByEnthalpy`	Type for partial derivative of density with respect to enthalpy with medium specific attributes
`DerDensityByPressure`	Type for partial derivative of density with respect to pressure with medium specific attributes
`DerDensityByTemperature`	Type for partial derivative of density with respect to temperature with medium specific attributes
`DerEnthalpyByPressure`	Type for partial derivative of enthalpy with respect to pressure with medium specific attributes
`DerTemperatureByPressure`	Type for partial derivative of temperature with respect to pressure with medium specific attributes
`DipoleMoment`	Type for dipole moment with medium specific attributes
`DynamicViscosity`	Type for dynamic viscosity with medium specific attributes
`dynamicViscosity`	Return dynamic viscosity as a function of the thermodynamic state record, valid from 123.15 K to 1273.15 K
`EnthalpyFlowRate`	Type for enthalpy flow rate with medium specific attributes
`enthalpyOfCondensingGas`	Return specific enthalpy of steam as a function of temperature T
`enthalpyOfGas`	Return specific enthalpy of gas (air and steam) as a function of temperature T and composition X
`enthalpyOfLiquid`	Return enthalpy of liquid water as a function of temperature T(use enthalpyOfWater instead)
`enthalpyOfNonCondensingGas`	Return specific enthalpy of dry air as a function of temperature T
`enthalpyOfVaporization`	Return enthalpy of vaporization of water as a function of temperature T, 273.16 to 647.096 K
`enthalpyOfWater`	Computes specific enthalpy of water (solid/liquid) near atmospheric pressure from temperature T
`enthalpyOfWater_der`	Derivative function of enthalpyOfWater
`ExtraProperty`	Type for unspecified, mass-specific property transported by flow
`ExtraPropertyFlowRate`	Type for flow rate of unspecified, mass-specific property
`FixedPhase`	Phase of the fluid: 1 for 1-phase, 2 for two-phase, 0 for not known, e.g., interactive use
`FluidConstants`
`FluidLimits`	Validity limits for fluid model
`gasConstant`	Return ideal gas constant as a function from thermodynamic state, only valid for phi<1
`gasConstant_X`	Return ideal gas constant as a function from composition X
`h_pTX`	Return specific enthalpy of moist air as a function of pressure p, temperature T and composition X
`h_pTX_der`	Derivative function of h_pTX
`heatCapacity_cp`	Alias for deprecated name
`heatCapacity_cv`	Alias for deprecated name
`HeatCapacityOfWater`	Return specific heat capacity of water (liquid only) as a function of temperature T
`IdealGas` …	The ideal gas version of a record used in several degrees of detail
`isentropicEnthalpy`	Isentropic enthalpy (only valid for phi<1)
`isentropicEnthalpyApproximation`	Approximate calculation of h_is from upstream properties, downstream pressure, gas part only
`IsentropicExponent`	Type for isentropic exponent with medium specific attributes
`isentropicExponent`	Return isentropic exponent (only for gas fraction!)
`IsobaricExpansionCoefficient`	Type for isobaric expansion coefficient with medium specific attributes
`isobaricExpansionCoefficient`
`isothermalCompressibility`
`kappa`	Alias of isothermalCompressibility for user convenience
`MassFlowRate`	Type for mass flow rate with medium specific attributes
`MassFraction`	Type for mass fraction with medium specific attributes
`massFraction_pTphi`	Return steam mass fraction as a function of relative humidity phi and temperature T
`massToMoleFractions`	Return mole fractions from mass fractions X
`MolarMass`	Type for molar mass with medium specific attributes
`molarMass`
`MolarVolume`	Type for molar volume with medium specific attributes
`MoleFraction`	Type for mole fraction with medium specific attributes
`moleToMassFractions`	Return mass fractions X from mole fractions
`PrandtlNumber`	Type for Prandtl number with medium specific attributes
`prandtlNumber`	Return the Prandtl number
`pressure`	Returns pressure of ideal gas as a function of the thermodynamic state record
`relativeHumidity`	Return relative humidity as a function of the thermodynamic state record
`relativeHumidity_pTX`	Return relative humidity as a function of pressure p, temperature T and composition X
`s_pTX`	Return specific entropy of moist air as a function of pressure p, temperature T and composition X (only valid for phi<1)
`s_pTX_der`	Return specific entropy of moist air as a function of pressure p, temperature T and composition X (only valid for phi<1)
`saturationPressure`	Return saturation pressure of water as a function of temperature T between 190 and 647.096 K
`saturationPressure_der`	Derivative function for 'saturationPressure'
`saturationPressureLiquid`	Return saturation pressure of water as a function of temperature T in the range of 273.16 to 647.096 K
`saturationPressureLiquid_der`	Derivative function for 'saturationPressureLiquid'
`SaturationProperties`	Saturation properties of two phase medium
`saturationTemperature`	Return saturation temperature of water as a function of (partial) pressure p
`setSmoothState`	Return thermodynamic state so that it smoothly approximates: if x > 0 then state_a else state_b
`setState_dTX`	Return thermodynamic state as function of density d, temperature T and composition X
`setState_phX`	Return thermodynamic state as function of pressure p, specific enthalpy h and composition X
`setState_psX`
`setState_pTX`	Return thermodynamic state as function of pressure p, temperature T and composition X
`SpecificEnergy`	Type for specific energy with medium specific attributes
`SpecificEnthalpy`	Type for specific enthalpy with medium specific attributes
`specificEnthalpy`	Return specific enthalpy of moist air as a function of the thermodynamic state record
`specificEnthalpy_psX`	Return specific enthalpy from p, s, and X or Xi
`specificEnthalpy_pTX`	Return specific enthalpy from p, T, and X or Xi
`SpecificEntropy`	Type for specific entropy with medium specific attributes
`specificEntropy`	Return specific entropy from thermodynamic state record, only valid for phi<1
`specificEntropy_pTX`	Return specific enthalpy from p, T, and X or Xi
`specificGibbsEnergy`	Return specific Gibbs energy as a function of the thermodynamic state record, only valid for phi<1
`SpecificHeatCapacity`	Type for specific heat capacity with medium specific attributes
`specificHeatCapacityCp`	Return specific heat capacity at constant pressure as a function of the thermodynamic state record
`specificHeatCapacityCv`	Return specific heat capacity at constant volume as a function of the thermodynamic state record
`specificHelmholtzEnergy`	Return specific Helmholtz energy as a function of the thermodynamic state record, only valid for phi<1
`SpecificInternalEnergy`	Type for specific internal energy with medium specific attributes
`specificInternalEnergy`	Return specific internal energy of moist air as a function of the thermodynamic state record
`specificInternalEnergy_pTX`	Return specific internal energy of moist air as a function of pressure p, temperature T and composition X
`specificInternalEnergy_pTX_der`	Derivative function for specificInternalEnergy_pTX
`sublimationPressureIce`	Return sublimation pressure of water as a function of temperature T between 190 and 273.16 K
`sublimationPressureIce_der`	Derivative function for 'sublimationPressureIce'
`SurfaceTension`	Type for surface tension with medium specific attributes
`T_phX`	Return temperature as a function of pressure p, specific enthalpy h and composition X
`T_psX`	Return temperature as a function of pressure p, specific entropy s and composition X
`Temperature`	Type for temperature with medium specific attributes
`temperature`	Return temperature of ideal gas as a function of the thermodynamic state record
`temperature_phX`	Return temperature from p, h, and X or Xi
`temperature_psX`	Return temperature from p,s, and X or Xi
`ThermalConductivity`	Type for thermal conductivity with medium specific attributes
`thermalConductivity`	Return thermal conductivity as a function of the thermodynamic state record, valid from 123.15 K to 1273.15 K
`ThermodynamicState`	ThermodynamicState record for moist air
`TwoPhase` …	The two phase fluid version of a record used in several degrees of detail
`Utilities` …	Utility functions
`VelocityOfSound`	Type for velocity of sound with medium specific attributes
`velocityOfSound`
`Xsaturation`	Return absolute humidity per unit mass of moist air at saturation as a function of the thermodynamic state record
`xsaturation`	Return absolute humidity per unit mass of dry air at saturation as a function of the thermodynamic state record
`xsaturation_pT`	Return absolute humidity per unit mass of dry air at saturation as a function of pressure p and temperature T

Package Constants

Type	Name	Value	Description
`Integer`	`Air`	`2`	Index of air (in substanceNames, massFractions X, etc.)
`ExtraProperty`	`C_default[nC]`	`fill(0, nC)`	Default value for trace substances of medium (for initialization)
`Real`	`C_nominal[nC]`	`1e-6 * ones(nC)`	Default for the nominal values for the extra properties
`DataRecord`	`dryair`	`IdealGases.Common.SingleGasesData.Air`
`String`	`extraPropertiesNames[:]`	`fill("", 0)`	Names of the additional (extra) transported properties. Set extraPropertiesNames=fill("",0) if unused
`Boolean`	`fixedX`	`false`	= true if medium contains the equation X = reference_X
`FluidConstants`	`fluidConstants[nS]`	`{IdealGases.Common.FluidData.H2O, IdealGases.Common.FluidData.N2}`	Constant data for the fluid
`SpecificEnthalpy`	`h_default`	`specificEnthalpy_pTX(p_default, T_default, X_default)`	Default value for specific enthalpy of medium (for initialization)
`Real`	`k_mair`	`steam.MM / dryair.MM`	Ratio of molar weights
`String`	`mediumName`	`"Moist air"`	Name of the medium
`MolarMass`	`MMX[2]`	`{steam.MM, dryair.MM}`	Molar masses of components
`final` `Integer`	`nC`	`size(extraPropertiesNames, 1)`	Number of extra (outside of standard mass-balance) transported properties
`final` `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)
`AbsolutePressure`	`p_default`	`101325`	Default value for pressure of medium (for initialization)
`final` `Boolean`	`reducedX`	`true`	= true if medium contains the equation sum(X) = 1.0; set reducedX=true if only one substance (see docu for details)
`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`	`reference_X[nX]`	`{0.01, 0.99}`	Default mass fractions of medium
`final` `Boolean`	`singleState`	`false`	= true, if u and d are not a function of pressure
`DataRecord`	`steam`	`IdealGases.Common.SingleGasesData.H2O`
`String`	`substanceNames[:]`	`{"water", "air"}`	Names of the mixture substances. Set substanceNames={mediumName} if only one substance.
`Temperature`	`T_default`	`Modelica.SIunits.Conversions.from_degC(20)`	Default value for temperature of medium (for initialization)
`IndependentVariables`	`ThermoStates`	`Modelica.Media.Interfaces.Choices.IndependentVariables.pTX`	Enumeration type for independent variables
`Integer`	`Water`	`1`	Index of water (in substanceNames, massFractions X, etc.)
`MassFraction`	`X_default[nX]`	`reference_X`	Default value for mass fractions of medium (for initialization)

Type Modelica.Media.Air.MoistAir.AbsolutePressure
Type for absolute pressure with medium specific attributes

Extends from Modelica.SIunits.AbsolutePressure.

Attributes

Name	Value
`quantity`	`"Pressure"`
`unit`	`"Pa"`
`displayUnit`	`"bar"`
`min`	`0`
`max`	`1e+8`
`start`	`100000`
`nominal`	`100000`

Type Modelica.Media.Air.MoistAir.Density
Type for density with medium specific attributes

Extends from Modelica.SIunits.Density.

Attributes

Name	Value
`quantity`	`"Density"`
`unit`	`"kg/m3"`
`displayUnit`	`"g/cm3"`
`min`	`0`
`max`	`100000`
`start`	`1`
`nominal`	`1`

Type Modelica.Media.Air.MoistAir.DynamicViscosity
Type for dynamic viscosity with medium specific attributes

Extends from Modelica.SIunits.DynamicViscosity.

Attributes

Name	Value
`quantity`	`"DynamicViscosity"`
`unit`	`"Pa.s"`
`min`	`0`
`max`	`1e+8`
`start`	`0.001`
`nominal`	`0.001`

Type Modelica.Media.Air.MoistAir.EnthalpyFlowRate
Type for enthalpy flow rate with medium specific attributes

Extends from Modelica.SIunits.EnthalpyFlowRate.

Attributes

Name	Value
`quantity`	`"EnthalpyFlowRate"`
`unit`	`"W"`
`min`	`-1e+8`
`max`	`1e+8`
`start`	`0.`
`nominal`	`1000`

Type Modelica.Media.Air.MoistAir.MassFraction
Type for mass fraction with medium specific attributes

Extends from Real.

Attributes

Name	Value
`quantity`	`"MassFraction"`
`unit`	`"kg/kg"`
`min`	`0`
`max`	`1`
`start`	`0.`
`nominal`	`0.1`

Type Modelica.Media.Air.MoistAir.MoleFraction
Type for mole fraction with medium specific attributes

Extends from Real.

Attributes

Name	Value
`quantity`	`"MoleFraction"`
`unit`	`"mol/mol"`
`min`	`0`
`max`	`1`
`start`	`0.`
`nominal`	`0.1`

Type Modelica.Media.Air.MoistAir.MolarMass
Type for molar mass with medium specific attributes

Extends from Modelica.SIunits.MolarMass.

Attributes

Name	Value
`quantity`	`"MolarMass"`
`unit`	`"kg/mol"`
`min`	`0.001`
`max`	`0.25`
`start`	`0.`
`nominal`	`0.032`

Type Modelica.Media.Air.MoistAir.MolarVolume
Type for molar volume with medium specific attributes

Extends from Modelica.SIunits.MolarVolume.

Attributes

Name	Value
`quantity`	`"MolarVolume"`
`unit`	`"m3/mol"`
`min`	`1e-6`
`max`	`1000000`
`start`	`0.`
`nominal`	`1`

Type Modelica.Media.Air.MoistAir.IsentropicExponent
Type for isentropic exponent with medium specific attributes

Extends from Modelica.SIunits.RatioOfSpecificHeatCapacities.

Attributes

Name	Value
`quantity`	`"RatioOfSpecificHeatCapacities"`
`unit`	`"1"`
`min`	`1`
`max`	`500000`
`start`	`1.2`
`nominal`	`1.2`

Type Modelica.Media.Air.MoistAir.SpecificEnergy
Type for specific energy with medium specific attributes

Extends from Modelica.SIunits.SpecificEnergy.

Attributes

Name	Value
`quantity`	`"SpecificEnergy"`
`unit`	`"J/kg"`
`min`	`-1e+8`
`max`	`1e+8`
`start`	`0.`
`nominal`	`1000000`

Type Modelica.Media.Air.MoistAir.SpecificInternalEnergy
Type for specific internal energy with medium specific attributes

Extends from Modelica.Media.Air.MoistAir.SpecificEnergy (Type for specific energy with medium specific attributes).

Attributes

Name	Value
`quantity`	`"SpecificEnergy"`
`unit`	`"J/kg"`
`min`	`-1e+8`
`max`	`1e+8`
`start`	`0.`
`nominal`	`1000000`

Type Modelica.Media.Air.MoistAir.SpecificEnthalpy
Type for specific enthalpy with medium specific attributes

Extends from Modelica.SIunits.SpecificEnthalpy.

Attributes

Name	Value
`quantity`	`"SpecificEnergy"`
`unit`	`"J/kg"`
`min`	`-1e+10`
`max`	`1e+10`
`start`	`0.`
`nominal`	`1000000`

Type Modelica.Media.Air.MoistAir.SpecificEntropy
Type for specific entropy with medium specific attributes

Extends from Modelica.SIunits.SpecificEntropy.

Attributes

Name	Value
`quantity`	`"SpecificEntropy"`
`unit`	`"J/(kg.K)"`
`min`	`-1e+7`
`max`	`1e+7`
`start`	`0.`
`nominal`	`1000`

Type Modelica.Media.Air.MoistAir.SpecificHeatCapacity
Type for specific heat capacity with medium specific attributes

Extends from Modelica.SIunits.SpecificHeatCapacity.

Attributes

Name	Value
`quantity`	`"SpecificHeatCapacity"`
`unit`	`"J/(kg.K)"`
`min`	`0`
`max`	`1e+7`
`start`	`1000`
`nominal`	`1000`

Type Modelica.Media.Air.MoistAir.SurfaceTension
Type for surface tension with medium specific attributes

Extends from Modelica.SIunits.SurfaceTension.

Attributes

Name	Value
`quantity`	`"SurfaceTension"`
`unit`	`"N/m"`
`min`	`-Modelica.Constants.inf`
`max`	`Modelica.Constants.inf`
`start`	`0.`

Type Modelica.Media.Air.MoistAir.Temperature
Type for temperature with medium specific attributes

Extends from Modelica.SIunits.Temperature.

Attributes

Name	Value
`quantity`	`"ThermodynamicTemperature"`
`unit`	`"K"`
`displayUnit`	`"degC"`
`min`	`190`
`max`	`647`
`start`	`288.15`
`nominal`	`300`

Type Modelica.Media.Air.MoistAir.ThermalConductivity
Type for thermal conductivity with medium specific attributes

Extends from Modelica.SIunits.ThermalConductivity.

Attributes

Name	Value
`quantity`	`"ThermalConductivity"`
`unit`	`"W/(m.K)"`
`min`	`0`
`max`	`500`
`start`	`1`
`nominal`	`1`

Type Modelica.Media.Air.MoistAir.PrandtlNumber
Type for Prandtl number with medium specific attributes

Extends from Modelica.SIunits.PrandtlNumber.

Attributes

Name	Value
`quantity`	`"PrandtlNumber"`
`unit`	`"1"`
`min`	`0.001`
`max`	`100000`
`start`	`0.`
`nominal`	`1`

Type Modelica.Media.Air.MoistAir.VelocityOfSound
Type for velocity of sound with medium specific attributes

Extends from Modelica.SIunits.Velocity.

Attributes

Name	Value
`quantity`	`"Velocity"`
`unit`	`"m/s"`
`min`	`0`
`max`	`100000`
`start`	`1000`
`nominal`	`1000`

Type Modelica.Media.Air.MoistAir.ExtraProperty
Type for unspecified, mass-specific property transported by flow

Extends from Real.

Attributes

Name	Value
`min`	`0`
`max`	`Modelica.Constants.inf`
`start`	`1`

Type Modelica.Media.Air.MoistAir.CumulativeExtraProperty
Type for conserved integral of unspecified, mass specific property

Extends from Real.

Attributes

Name	Value
`min`	`0`
`max`	`Modelica.Constants.inf`
`start`	`1`

Type Modelica.Media.Air.MoistAir.ExtraPropertyFlowRate
Type for flow rate of unspecified, mass-specific property

Extends from Real.

Attributes

Name	Value
`unit`	`"kg/s"`
`min`	`-Modelica.Constants.inf`
`max`	`Modelica.Constants.inf`
`start`	`0.`

Type Modelica.Media.Air.MoistAir.IsobaricExpansionCoefficient
Type for isobaric expansion coefficient with medium specific attributes

Extends from Real.

Attributes

Name	Value
`unit`	`"1/K"`
`min`	`0`
`max`	`1e+8`
`start`	`0.`

Type Modelica.Media.Air.MoistAir.DipoleMoment
Type for dipole moment with medium specific attributes

Extends from Real.

Attributes

Name	Value
`quantity`	`"ElectricDipoleMoment"`
`unit`	`"debye"`
`min`	`0`
`max`	`2`
`start`	`0.`

Type Modelica.Media.Air.MoistAir.DerDensityByPressure
Type for partial derivative of density with respect to pressure with medium specific attributes

Extends from Modelica.SIunits.DerDensityByPressure.

Attributes

Name	Value
`unit`	`"s2/m2"`
`min`	`-Modelica.Constants.inf`
`max`	`Modelica.Constants.inf`
`start`	`0.`

Type Modelica.Media.Air.MoistAir.DerDensityByEnthalpy
Type for partial derivative of density with respect to enthalpy with medium specific attributes

Extends from Modelica.SIunits.DerDensityByEnthalpy.

Attributes

Name	Value
`unit`	`"kg.s2/m5"`
`min`	`-Modelica.Constants.inf`
`max`	`Modelica.Constants.inf`
`start`	`0.`

Type Modelica.Media.Air.MoistAir.DerEnthalpyByPressure
Type for partial derivative of enthalpy with respect to pressure with medium specific attributes

Extends from Modelica.SIunits.DerEnthalpyByPressure.

Attributes

Name	Value
`unit`	`"J.m.s2/kg2"`
`min`	`-Modelica.Constants.inf`
`max`	`Modelica.Constants.inf`
`start`	`0.`

Type Modelica.Media.Air.MoistAir.DerDensityByTemperature
Type for partial derivative of density with respect to temperature with medium specific attributes

Extends from Modelica.SIunits.DerDensityByTemperature.

Attributes

Name	Value
`unit`	`"kg/(m3.K)"`
`min`	`-Modelica.Constants.inf`
`max`	`Modelica.Constants.inf`
`start`	`0.`

Type Modelica.Media.Air.MoistAir.DerTemperatureByPressure
Type for partial derivative of temperature with respect to pressure with medium specific attributes

Extends from Real.

Attributes

Name	Value
`unit`	`"K/Pa"`
`min`	`-Modelica.Constants.inf`
`max`	`Modelica.Constants.inf`
`start`	`0.`

Record Modelica.Media.Air.MoistAir.SaturationProperties
Saturation properties of two phase medium

Information

This icon is indicates a record.

Extends from Modelica.Icons.Record (Icon for records).

Fields

Type	Name	Description
`AbsolutePressure`	`psat`	Saturation pressure
`Temperature`	`Tsat`	Saturation temperature

Record Modelica.Media.Air.MoistAir.FluidLimits
Validity limits for fluid model

Information

The minimum pressure mostly applies to the liquid state only. The minimum density is also arbitrary, but is reasonable for technical applications to limit iterations in non-linear systems. The limits in enthalpy and entropy are used as safeguards in inverse iterations.

Extends from Modelica.Icons.Record (Icon for records).

Fields

Type	Name	Description
`Temperature`	`TMIN`	Minimum temperature
`Temperature`	`TMAX`	Maximum temperature
`Density`	`DMIN`	Minimum density
`Density`	`DMAX`	Maximum density
`AbsolutePressure`	`PMIN`	Minimum pressure
`AbsolutePressure`	`PMAX`	Maximum pressure
`SpecificEnthalpy`	`HMIN`	Minimum enthalpy
`SpecificEnthalpy`	`HMAX`	Maximum enthalpy
`SpecificEntropy`	`SMIN`	Minimum entropy
`SpecificEntropy`	`SMAX`	Maximum entropy

Type Modelica.Media.Air.MoistAir.FixedPhase
Phase of the fluid: 1 for 1-phase, 2 for two-phase, 0 for not known, e.g., interactive use

Extends from Integer.

Attributes

Name	Value
`min`	`0`
`max`	`2`
`start`	`0`

Record Modelica.Media.Air.MoistAir.FluidConstants
Extended fluid constants

Information

This icon is indicates a record.

Extends from Modelica.Media.Interfaces.Types.IdealGas.FluidConstants (Extended fluid constants).

Fields

Type	Name	Description
`String`	`iupacName`	Complete IUPAC name (or common name, if non-existent)
`String`	`casRegistryNumber`	Chemical abstracts sequencing number (if it exists)
`String`	`chemicalFormula`	Chemical formula, (brutto, nomenclature according to Hill
`String`	`structureFormula`	Chemical structure formula
`MolarMass`	`molarMass`	Molar mass
`Temperature`	`criticalTemperature`	Critical temperature
`AbsolutePressure`	`criticalPressure`	Critical pressure
`MolarVolume`	`criticalMolarVolume`	Critical molar Volume
`Real`	`acentricFactor`	Pitzer acentric factor
`Temperature`	`meltingPoint`	Melting point at 101325 Pa
`Temperature`	`normalBoilingPoint`	Normal boiling point (at 101325 Pa)
`DipoleMoment`	`dipoleMoment`	Dipole moment of molecule in Debye (1 debye = 3.33564e10-30 C.m)
`Boolean`	`hasIdealGasHeatCapacity`	True if ideal gas heat capacity is available
`Boolean`	`hasCriticalData`	True if critical data are known
`Boolean`	`hasDipoleMoment`	True if a dipole moment known
`Boolean`	`hasFundamentalEquation`	True if a fundamental equation
`Boolean`	`hasLiquidHeatCapacity`	True if liquid heat capacity is available
`Boolean`	`hasSolidHeatCapacity`	True if solid heat capacity is available
`Boolean`	`hasAccurateViscosityData`	True if accurate data for a viscosity function is available
`Boolean`	`hasAccurateConductivityData`	True if accurate data for thermal conductivity is available
`Boolean`	`hasVapourPressureCurve`	True if vapour pressure data, e.g., Antoine coefficients are known
`Boolean`	`hasAcentricFactor`	True if Pitzer acentric factor is known
`SpecificEnthalpy`	`HCRIT0`	Critical specific enthalpy of the fundamental equation
`SpecificEntropy`	`SCRIT0`	Critical specific entropy of the fundamental equation
`SpecificEnthalpy`	`deltah`	Difference between specific enthalpy model (h_m) and f.eq. (h_f) (h_m - h_f)
`SpecificEntropy`	`deltas`	Difference between specific enthalpy model (s_m) and f.eq. (s_f) (s_m - s_f)

Record Modelica.Media.Air.MoistAir.ThermodynamicState
ThermodynamicState record for moist air

Information

This icon is indicates a record.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.ThermodynamicState (Thermodynamic state variables).

Fields

Type	Name	Description
`AbsolutePressure`	`p`	Absolute pressure of medium
`Temperature`	`T`	Temperature of medium
`MassFraction`	`X[nX]`	Mass fractions (= (component mass)/total mass m_i/m)

Model Modelica.Media.Air.MoistAir.BaseProperties
Moist air base properties record

Information

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.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.BaseProperties (Base properties (p, d, T, h, u, R, MM and, if applicable, X and Xi) of a medium).

Parameters

Type	Name	Default	Description
`Boolean`	`preferredMediumStates`	`false`	= true if StateSelect.prefer shall be used for the independent property variables of the medium
`final` `Boolean`	`standardOrderComponents`	`true`	If true, and reducedX = true, the last element of X will be computed from the other ones

Connectors

Type	Name	Description
`input` `InputAbsolutePressure`	`p`	Absolute pressure of medium
`input` `InputMassFraction`	`Xi[nXi]`	Structurally independent mass fractions
`input` `InputSpecificEnthalpy`	`h`	Specific enthalpy of medium

Function Modelica.Media.Air.MoistAir.setState_pTX
Return thermodynamic state as function of pressure p, temperature T and composition X

Information

The thermodynamic state record is computed from pressure p, temperature T and composition X.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`AbsolutePressure`	`p`	Pressure
`Temperature`	`T`	Temperature
`MassFraction`	`X[:]`	Mass fractions

Outputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state

Function Modelica.Media.Air.MoistAir.setState_phX
Return thermodynamic state as function of pressure p, specific enthalpy h and composition X

Information

The thermodynamic state record is computed from pressure p, specific enthalpy h and composition X.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`AbsolutePressure`	`p`	Pressure
`SpecificEnthalpy`	`h`	Specific enthalpy
`MassFraction`	`X[:]`	Mass fractions

Outputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state

Function Modelica.Media.Air.MoistAir.setState_psX
Return thermodynamic state as function of p, s and composition X or Xi

Information

The thermodynamic state record is computed from pressure p, specific enthalpy h and composition X.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.setState_psX (Return thermodynamic state as function of p, s and composition X or Xi).

Inputs

Type	Name	Description
`AbsolutePressure`	`p`	Pressure
`SpecificEntropy`	`s`	Specific entropy
`MassFraction`	`X[:]`	Mass fractions

Outputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Function Modelica.Media.Air.MoistAir.setState_dTX
Return thermodynamic state as function of density d, temperature T and composition X

Information

The thermodynamic state record is computed from density d, temperature T and composition X.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`Density`	`d`	Density
`Temperature`	`T`	Temperature
`MassFraction`	`X[:]`	Mass fractions

Outputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state

Function Modelica.Media.Air.MoistAir.setSmoothState
Return thermodynamic state so that it smoothly approximates: if x > 0 then state_a else state_b

Information

This function is used to approximate the equation

    state = if x > 0 then state_a else state_b;

by a smooth characteristic, so that the expression is continuous and differentiable:

   state := smooth(1, if x >  x_small then state_a else
                      if x < -x_small then state_b else f(state_a, state_b));

This is performed by applying function Media.Common.smoothStep(..) on every element of the thermodynamic state record.

If mass fractions X[:] are approximated with this function then this can be performed for all nX mass fractions, instead of applying it for nX-1 mass fractions and computing the last one by the mass fraction constraint sum(X)=1. The reason is that the approximating function has the property that sum(state.X) = 1, provided sum(state_a.X) = sum(state_b.X) = 1. This can be shown by evaluating the approximating function in the abs(x) < x_small region (otherwise state.X is either state_a.X or state_b.X):

    X[1]  = smoothStep(x, X_a[1] , X_b[1] , x_small);
    X[2]  = smoothStep(x, X_a[2] , X_b[2] , x_small);
       ...
    X[nX] = smoothStep(x, X_a[nX], X_b[nX], x_small);

    X[1]  = c*(X_a[1]  - X_b[1])  + (X_a[1]  + X_b[1])/2
    X[2]  = c*(X_a[2]  - X_b[2])  + (X_a[2]  + X_b[2])/2;
       ...
    X[nX] = c*(X_a[nX] - X_b[nX]) + (X_a[nX] + X_b[nX])/2;
    c     = (x/x_small)*((x/x_small)^2 - 3)/4

Summing all mass fractions together results in

    sum(X) = c*(sum(X_a) - sum(X_b)) + (sum(X_a) + sum(X_b))/2
           = c*(1 - 1) + (1 + 1)/2
           = 1

Extends from Modelica.Media.Interfaces.PartialCondensingGases.setSmoothState (Return thermodynamic state so that it smoothly approximates: if x > 0 then state_a else state_b).

Inputs

Type	Name	Description
`Real`	`x`	m_flow or dp
`ThermodynamicState`	`state_a`	Thermodynamic state if x > 0
`ThermodynamicState`	`state_b`	Thermodynamic state if x < 0
`Real`	`x_small`	Smooth transition in the region -x_small < x < x_small

Outputs

Type	Name	Description
`ThermodynamicState`	`state`	Smooth thermodynamic state for all x (continuous and differentiable)

Function Modelica.Media.Air.MoistAir.dynamicViscosity
Return dynamic viscosity as a function of the thermodynamic state record, valid from 123.15 K to 1273.15 K

Information

Dynamic viscosity is computed from temperature using a simple polynomial for dry air. Range of validity is from 123.15 K to 1273.15 K. The influence of pressure and moisture is neglected.

Source: VDI Waermeatlas, 8th edition.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.dynamicViscosity (Return dynamic viscosity).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`DynamicViscosity`	`eta`	Dynamic viscosity

Function Modelica.Media.Air.MoistAir.thermalConductivity
Return thermal conductivity as a function of the thermodynamic state record, valid from 123.15 K to 1273.15 K

Information

Thermal conductivity is computed from temperature using a simple polynomial for dry air. Range of validity is from 123.15 K to 1273.15 K. The influence of pressure and moisture is neglected.

Source: VDI Waermeatlas, 8th edition.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.thermalConductivity (Return thermal conductivity).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`ThermalConductivity`	`lambda`	Thermal conductivity

Function Modelica.Media.Air.MoistAir.prandtlNumber
Return the Prandtl number

Information

This icon indicates Modelica functions.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`PrandtlNumber`	`Pr`	Prandtl number

Function Modelica.Media.Air.MoistAir.pressure
Returns pressure of ideal gas as a function of the thermodynamic state record

Information

Pressure is returned from the thermodynamic state record input as a simple assignment.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.pressure (Return pressure).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`AbsolutePressure`	`p`	Pressure

Function Modelica.Media.Air.MoistAir.temperature
Return temperature of ideal gas as a function of the thermodynamic state record

Information

Temperature is returned from the thermodynamic state record input as a simple assignment.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.temperature (Return temperature).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`Temperature`	`T`	Temperature

Function Modelica.Media.Air.MoistAir.density
Returns density of ideal gas as a function of the thermodynamic state record

Information

Density is computed from pressure, temperature and composition in the thermodynamic state record applying the ideal gas law.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.density (Return density).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`Density`	`d`	Density

Function Modelica.Media.Air.MoistAir.specificEnthalpy
Return specific enthalpy of moist air as a function of the thermodynamic state record

Information

Specific enthalpy of moist air is computed from the thermodynamic state record. The fog region is included for both, ice and liquid fog.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.specificEnthalpy (Return specific enthalpy).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`SpecificEnthalpy`	`h`	Specific enthalpy

Function Modelica.Media.Air.MoistAir.specificInternalEnergy
Return specific internal energy of moist air as a function of the thermodynamic state record

Information

Specific internal energy is determined from the thermodynamic state record, assuming that the liquid or solid water volume is negligible.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.specificInternalEnergy (Return specific internal energy) and Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`SpecificEnergy`	`u`	Specific internal energy

Function Modelica.Media.Air.MoistAir.specificEntropy
Return specific entropy from thermodynamic state record, only valid for phi<1

Information

Specific entropy is calculated from the thermodynamic state record, assuming ideal gas behavior and including entropy of mixing. Liquid or solid water is not taken into account, the entire water content X[1] is assumed to be in the vapor state (relative humidity below 1.0).

Extends from Modelica.Media.Interfaces.PartialCondensingGases.specificEntropy (Return specific entropy).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`SpecificEntropy`	`s`	Specific entropy

Function Modelica.Media.Air.MoistAir.specificGibbsEnergy
Return specific Gibbs energy as a function of the thermodynamic state record, only valid for phi<1

Information

The Gibbs Energy is computed from the thermodynamic state record for moist air with a water content below saturation.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.specificGibbsEnergy (Return specific Gibbs energy) and Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`SpecificEnergy`	`g`	Specific Gibbs energy

Function Modelica.Media.Air.MoistAir.specificHelmholtzEnergy
Return specific Helmholtz energy as a function of the thermodynamic state record, only valid for phi<1

Information

The Specific Helmholtz Energy is computed from the thermodynamic state record for moist air with a water content below saturation.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.specificHelmholtzEnergy (Return specific Helmholtz energy) and Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`SpecificEnergy`	`f`	Specific Helmholtz energy

Function Modelica.Media.Air.MoistAir.specificHeatCapacityCp
Return specific heat capacity at constant pressure as a function of the thermodynamic state record

Information

The specific heat capacity at constant pressure cp is computed from temperature and composition for a mixture of steam (X[1]) and dry air. All water is assumed to be in the vapor state.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.specificHeatCapacityCp (Return specific heat capacity at constant pressure).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`SpecificHeatCapacity`	`cp`	Specific heat capacity at constant pressure

Function Modelica.Media.Air.MoistAir.heatCapacity_cp
Alias for deprecated name

Information

The specific heat capacity at constant pressure cp is computed from temperature and composition for a mixture of steam (X[1]) and dry air. All water is assumed to be in the vapor state.

Extends from Modelica.Media.Air.MoistAir.specificHeatCapacityCp (Return specific heat capacity at constant pressure as a function of the thermodynamic state record).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`SpecificHeatCapacity`	`cp`	Specific heat capacity at constant pressure

Function Modelica.Media.Air.MoistAir.specificHeatCapacityCv
Return specific heat capacity at constant volume as a function of the thermodynamic state record

Information

The specific heat capacity at constant density cv is computed from temperature and composition for a mixture of steam (X[1]) and dry air. All water is assumed to be in the vapor state.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.specificHeatCapacityCv (Return specific heat capacity at constant volume).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`SpecificHeatCapacity`	`cv`	Specific heat capacity at constant volume

Function Modelica.Media.Air.MoistAir.heatCapacity_cv
Alias for deprecated name

Information

The specific heat capacity at constant density cv is computed from temperature and composition for a mixture of steam (X[1]) and dry air. All water is assumed to be in the vapor state.

Extends from Modelica.Media.Air.MoistAir.specificHeatCapacityCv (Return specific heat capacity at constant volume as a function of the thermodynamic state record).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`SpecificHeatCapacity`	`cv`	Specific heat capacity at constant volume

Function Modelica.Media.Air.MoistAir.isentropicExponent
Return isentropic exponent (only for gas fraction!)

Information

This icon indicates Modelica functions.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.isentropicExponent (Return isentropic exponent).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`IsentropicExponent`	`gamma`	Isentropic exponent

Function Modelica.Media.Air.MoistAir.isentropicEnthalpy
Isentropic enthalpy (only valid for phi<1)

Information

This icon indicates Modelica functions.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.isentropicEnthalpy (Return isentropic enthalpy) and Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`AbsolutePressure`	`p_downstream`	Downstream pressure
`ThermodynamicState`	`refState`	Reference state for entropy

Outputs

Type	Name	Description
`SpecificEnthalpy`	`h_is`	Isentropic enthalpy

Function Modelica.Media.Air.MoistAir.velocityOfSound
Return velocity of sound

Information

This icon indicates Modelica functions.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.velocityOfSound (Return velocity of sound).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`VelocityOfSound`	`a`	Velocity of sound

Function Modelica.Media.Air.MoistAir.isobaricExpansionCoefficient
Return overall the isobaric expansion coefficient beta

Information

beta is defined as  1/v * der(v,T), with v = 1/d, at constant pressure p.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.isobaricExpansionCoefficient (Return overall the isobaric expansion coefficient beta).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`IsobaricExpansionCoefficient`	`beta`	Isobaric expansion coefficient

Function Modelica.Media.Air.MoistAir.beta
Alias for isobaricExpansionCoefficient for user convenience

Information

beta is defined as  1/v * der(v,T), with v = 1/d, at constant pressure p.

Extends from Modelica.Media.Air.MoistAir.isobaricExpansionCoefficient.

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`IsobaricExpansionCoefficient`	`beta`	Isobaric expansion coefficient

Function Modelica.Media.Air.MoistAir.isothermalCompressibility
Return overall the isothermal compressibility factor

Information


kappa is defined as - 1/v * der(v,p), with v = 1/d at constant temperature T.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.isothermalCompressibility (Return overall the isothermal compressibility factor).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`IsothermalCompressibility`	`kappa`	Isothermal compressibility

Function Modelica.Media.Air.MoistAir.kappa
Alias of isothermalCompressibility for user convenience

Information


kappa is defined as - 1/v * der(v,p), with v = 1/d at constant temperature T.

Extends from Modelica.Media.Air.MoistAir.isothermalCompressibility.

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`IsothermalCompressibility`	`kappa`	Isothermal compressibility

Function Modelica.Media.Air.MoistAir.density_derp_h
Return density derivative w.r.t. pressure at const specific enthalpy

Information

This icon indicates Modelica functions.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.density_derp_h (Return density derivative w.r.t. pressure at const specific enthalpy).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`DerDensityByPressure`	`ddph`	Density derivative w.r.t. pressure

Function Modelica.Media.Air.MoistAir.density_derh_p
Return density derivative w.r.t. specific enthalpy at constant pressure

Information

This icon indicates Modelica functions.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.density_derh_p (Return density derivative w.r.t. specific enthalpy at constant pressure).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`DerDensityByEnthalpy`	`ddhp`	Density derivative w.r.t. specific enthalpy

Function Modelica.Media.Air.MoistAir.density_derp_T
Return density derivative w.r.t. pressure at const temperature

Information

This icon indicates Modelica functions.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.density_derp_T (Return density derivative w.r.t. pressure at const temperature).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`DerDensityByPressure`	`ddpT`	Density derivative w.r.t. pressure

Function Modelica.Media.Air.MoistAir.density_derT_p
Return density derivative w.r.t. temperature at constant pressure

Information

This icon indicates Modelica functions.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.density_derT_p (Return density derivative w.r.t. temperature at constant pressure).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`DerDensityByTemperature`	`ddTp`	Density derivative w.r.t. temperature

Function Modelica.Media.Air.MoistAir.density_derX
Return density derivative w.r.t. mass fraction

Information

This icon indicates Modelica functions.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.density_derX (Return density derivative w.r.t. mass fraction).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`Density`	`dddX[nX]`	Derivative of density w.r.t. mass fraction

Function Modelica.Media.Air.MoistAir.molarMass
Return the molar mass of the medium

Information

This icon indicates Modelica functions.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.molarMass (Return the molar mass of the medium).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`MolarMass`	`MM`	Mixture molar mass

Function Modelica.Media.Air.MoistAir.specificEnthalpy_pTX
Return specific enthalpy from p, T, and X or Xi

Information

This icon indicates Modelica functions.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`AbsolutePressure`	`p`	Pressure
`Temperature`	`T`	Temperature
`MassFraction`	`X[:]`	Mass fractions

Outputs

Type	Name	Description
`SpecificEnthalpy`	`h`	Specific enthalpy

Function Modelica.Media.Air.MoistAir.specificEntropy_pTX
Return specific enthalpy from p, T, and X or Xi

Information

This icon indicates Modelica functions.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`AbsolutePressure`	`p`	Pressure
`Temperature`	`T`	Temperature
`MassFraction`	`X[:]`	Mass fractions

Outputs

Type	Name	Description
`SpecificEntropy`	`s`	Specific entropy

Function Modelica.Media.Air.MoistAir.density_pTX
Return density from p, T, and X or Xi

Information

This icon indicates Modelica functions.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`AbsolutePressure`	`p`	Pressure
`Temperature`	`T`	Temperature
`MassFraction`	`X[:]`	Mass fractions

Outputs

Type	Name	Description
`Density`	`d`	Density

Function Modelica.Media.Air.MoistAir.temperature_phX
Return temperature from p, h, and X or Xi

Information

This icon indicates Modelica functions.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`AbsolutePressure`	`p`	Pressure
`SpecificEnthalpy`	`h`	Specific enthalpy
`MassFraction`	`X[:]`	Mass fractions

Outputs

Type	Name	Description
`Temperature`	`T`	Temperature

Function Modelica.Media.Air.MoistAir.density_phX
Return density from p, h, and X or Xi

Information

This icon indicates Modelica functions.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`AbsolutePressure`	`p`	Pressure
`SpecificEnthalpy`	`h`	Specific enthalpy
`MassFraction`	`X[:]`	Mass fractions

Outputs

Type	Name	Description
`Density`	`d`	Density

Function Modelica.Media.Air.MoistAir.temperature_psX
Return temperature from p,s, and X or Xi

Information

This icon indicates Modelica functions.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`AbsolutePressure`	`p`	Pressure
`SpecificEntropy`	`s`	Specific entropy
`MassFraction`	`X[:]`	Mass fractions

Outputs

Type	Name	Description
`Temperature`	`T`	Temperature

Function Modelica.Media.Air.MoistAir.density_psX
Return density from p, s, and X or Xi

Information

This icon indicates Modelica functions.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`AbsolutePressure`	`p`	Pressure
`SpecificEntropy`	`s`	Specific entropy
`MassFraction`	`X[:]`	Mass fractions

Outputs

Type	Name	Description
`Density`	`d`	Density

Function Modelica.Media.Air.MoistAir.specificEnthalpy_psX
Return specific enthalpy from p, s, and X or Xi

Information

This icon indicates Modelica functions.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`AbsolutePressure`	`p`	Pressure
`SpecificEntropy`	`s`	Specific entropy
`MassFraction`	`X[:]`	Mass fractions

Outputs

Type	Name	Description
`SpecificEnthalpy`	`h`	Specific enthalpy

Type Modelica.Media.Air.MoistAir.MassFlowRate
Type for mass flow rate with medium specific attributes

Extends from Modelica.SIunits.MassFlowRate.

Attributes

Name	Value
`quantity`	`"MassFlowRate." + mediumName`
`unit`	`"kg/s"`
`min`	`-100000`
`max`	`100000`
`start`	`0.`

Function Modelica.Media.Air.MoistAir.gasConstant
Return ideal gas constant as a function from thermodynamic state, only valid for phi<1

Information

The ideal gas constant for moist air is computed from thermodynamic state assuming that all water is in the gas phase.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.gasConstant (Return the gas constant of the mixture (also for liquids)).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state

Outputs

Type	Name	Description
`SpecificHeatCapacity`	`R`	Mixture gas constant

Function Modelica.Media.Air.MoistAir.moleToMassFractions
Return mass fractions X from mole fractions

Information

This icon indicates Modelica functions.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`MoleFraction`	`moleFractions[:]`	Mole fractions of mixture
`MolarMass`	`MMX[:]`	Molar masses of components

Outputs

Type	Name	Description
`MassFraction`	`X[size(moleFractions, 1)]`	Mass fractions of gas mixture

Function Modelica.Media.Air.MoistAir.massToMoleFractions
Return mole fractions from mass fractions X

Information

This icon indicates Modelica functions.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`MassFraction`	`X[:]`	Mass fractions of mixture
`MolarMass`	`MMX[:]`	Molar masses of components

Outputs

Type	Name	Description
`MoleFraction`	`moleFractions[size(X, 1)]`	Mole fractions of gas mixture

Function Modelica.Media.Air.MoistAir.saturationPressure
Return saturation pressure of water as a function of temperature T between 190 and 647.096 K

Information

Saturation pressure of water in the liquid and the solid region is computed using correlations. Functions for the solid and the liquid region, respectively, are combined using the first derivative continuous spliceFunction. This functions range of validity is from 190 to 647.096 K. For more information on the type of correlation used, see the documentation of the linked functions.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.saturationPressure (Return saturation pressure of condensing fluid).

Inputs

Type	Name	Description
`Temperature`	`Tsat`	Saturation temperature

Outputs

Type	Name	Description
`AbsolutePressure`	`psat`	Saturation pressure

Function Modelica.Media.Air.MoistAir.enthalpyOfVaporization
Return enthalpy of vaporization of water as a function of temperature T, 273.16 to 647.096 K

Information

Enthalpy of vaporization of water is computed from temperature in the region of 273.16 to 647.096 K.

Source: W Wagner, A Pruss: "International equations for the saturation properties of ordinary water substance. Revised according to the international temperature scale of 1990" (1993).

Extends from Modelica.Media.Interfaces.PartialCondensingGases.enthalpyOfVaporization (Return vaporization enthalpy of condensing fluid).

Inputs

Type	Name	Description
`Temperature`	`T`	Temperature

Outputs

Type	Name	Description
`SpecificEnthalpy`	`r0`	Vaporization enthalpy

Function Modelica.Media.Air.MoistAir.enthalpyOfLiquid
Return enthalpy of liquid water as a function of temperature T(use enthalpyOfWater instead)

Information

Specific enthalpy of liquid water is computed from temperature using a polynomial approach. Kept for compatibility reasons, better use enthalpyOfWater instead.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.enthalpyOfLiquid (Return liquid enthalpy of condensing fluid).

Inputs

Type	Name	Description
`Temperature`	`T`	Temperature

Outputs

Type	Name	Description
`SpecificEnthalpy`	`h`	Liquid enthalpy

Function Modelica.Media.Air.MoistAir.enthalpyOfGas
Return specific enthalpy of gas (air and steam) as a function of temperature T and composition X

Information

Specific enthalpy of moist air is computed from temperature, provided all water is in the gaseous state. The first entry in the composition vector X must be the mass fraction of steam. For a function that also covers the fog region please refer to h_pTX.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.enthalpyOfGas (Return enthalpy of non-condensing gas mixture).

Inputs

Type	Name	Description
`Temperature`	`T`	Temperature
`MassFraction`	`X[:]`	Vector of mass fractions

Outputs

Type	Name	Description
`SpecificEnthalpy`	`h`	Specific enthalpy

Function Modelica.Media.Air.MoistAir.enthalpyOfCondensingGas
Return specific enthalpy of steam as a function of temperature T

Information

Specific enthalpy of steam is computed from temperature.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.enthalpyOfCondensingGas (Return enthalpy of condensing gas (most often steam)).

Inputs

Type	Name	Description
`Temperature`	`T`	Temperature

Outputs

Type	Name	Description
`SpecificEnthalpy`	`h`	Specific enthalpy

Function Modelica.Media.Air.MoistAir.enthalpyOfNonCondensingGas
Return specific enthalpy of dry air as a function of temperature T

Information

Specific enthalpy of dry air is computed from temperature.

Extends from Modelica.Media.Interfaces.PartialCondensingGases.enthalpyOfNonCondensingGas (Return enthalpy of the non-condensing species).

Inputs

Type	Name	Description
`Temperature`	`T`	Temperature

Outputs

Type	Name	Description
`SpecificEnthalpy`	`h`	Specific enthalpy

Function Modelica.Media.Air.MoistAir.Xsaturation
Return absolute humidity per unit mass of moist air at saturation as a function of the thermodynamic state record

Information

Absolute humidity per unit mass of moist air at saturation is computed from pressure and temperature in the state record. Note, that unlike X_sat in the BaseProperties model this mass fraction refers to mass of moist air at saturation.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`MassFraction`	`X_sat`	Steam mass fraction of sat. boundary

Function Modelica.Media.Air.MoistAir.xsaturation
Return absolute humidity per unit mass of dry air at saturation as a function of the thermodynamic state record

Information

Absolute humidity per unit mass of dry air at saturation is computed from pressure and temperature in the thermodynamic state record.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state record

Outputs

Type	Name	Description
`MassFraction`	`x_sat`	Absolute humidity per unit mass of dry air

Function Modelica.Media.Air.MoistAir.xsaturation_pT
Return absolute humidity per unit mass of dry air at saturation as a function of pressure p and temperature T

Information

Absolute humidity per unit mass of dry air at saturation is computed from pressure and temperature.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`AbsolutePressure`	`p`	Pressure
`Temperature`	`T`	Temperature

Outputs

Type	Name	Description
`MassFraction`	`x_sat`	Absolute humidity per unit mass of dry air

Function Modelica.Media.Air.MoistAir.massFraction_pTphi
Return steam mass fraction as a function of relative humidity phi and temperature T

Information

Absolute humidity per unit mass of moist air is computed from temperature, pressure and relative humidity.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`AbsolutePressure`	`p`	Pressure
`Temperature`	`T`	Temperature
`Real`	`phi`	Relative humidity (0 ... 1.0)

Outputs

Type	Name	Description
`MassFraction`	`X_steam`	Absolute humidity, steam mass fraction

Function Modelica.Media.Air.MoistAir.relativeHumidity_pTX
Return relative humidity as a function of pressure p, temperature T and composition X

Information

Relative humidity is computed from pressure, temperature and composition with 1.0 as the upper limit at saturation. Water mass fraction is the first entry in the composition vector.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`Pressure`	`p`	Pressure
`Temperature`	`T`	Temperature
`MassFraction`	`X[:]`	Composition

Outputs

Type	Name	Description
`Real`	`phi`	Relative humidity

Function Modelica.Media.Air.MoistAir.relativeHumidity
Return relative humidity as a function of the thermodynamic state record

Information

Relative humidity is computed from the thermodynamic state record with 1.0 as the upper limit at saturation.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`ThermodynamicState`	`state`	Thermodynamic state

Outputs

Type	Name	Description
`Real`	`phi`	Relative humidity

Function Modelica.Media.Air.MoistAir.gasConstant_X
Return ideal gas constant as a function from composition X

Information

The ideal gas constant for moist air is computed from the gas phase composition. The first entry in composition vector X is the steam mass fraction of the gas phase.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`MassFraction`	`X[:]`	Gas phase composition

Outputs

Type	Name	Description
`SpecificHeatCapacity`	`R`	Ideal gas constant

Function Modelica.Media.Air.MoistAir.saturationPressureLiquid
Return saturation pressure of water as a function of temperature T in the range of 273.16 to 647.096 K

Information

Saturation pressure of water above the triple point temperature is computed from temperature.

Source: A Saul, W Wagner: "International equations for the saturation properties of ordinary water substance", equation 2.1

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`Temperature`	`Tsat`	Saturation temperature

Outputs

Type	Name	Description
`AbsolutePressure`	`psat`	Saturation pressure

Function Modelica.Media.Air.MoistAir.saturationPressureLiquid_der
Derivative function for 'saturationPressureLiquid'

Information

Saturation pressure of water above the triple point temperature is computed from temperature.

Source: A Saul, W Wagner: "International equations for the saturation properties of ordinary water substance", equation 2.1

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`Temperature`	`Tsat`	Saturation temperature
`Real`	`dTsat`	Saturation temperature derivative

Outputs

Type	Name	Description
`Real`	`psat_der`	Saturation pressure derivative

Function Modelica.Media.Air.MoistAir.sublimationPressureIce
Return sublimation pressure of water as a function of temperature T between 190 and 273.16 K

Information

Sublimation pressure of water below the triple point temperature is computed from temperature.

Source: W Wagner, A Saul, A Pruss: "International equations for the pressure along the melting and along the sublimation curve of ordinary water substance", equation 3.5

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`Temperature`	`Tsat`	Sublimation temperature

Outputs

Type	Name	Description
`AbsolutePressure`	`psat`	Sublimation pressure

Function Modelica.Media.Air.MoistAir.sublimationPressureIce_der
Derivative function for 'sublimationPressureIce'

Information

Sublimation pressure of water below the triple point temperature is computed from temperature.

Source: W Wagner, A Saul, A Pruss: "International equations for the pressure along the melting and along the sublimation curve of ordinary water substance", equation 3.5

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`Temperature`	`Tsat`	Sublimation temperature
`Real`	`dTsat`	Sublimation temperature derivative

Outputs

Type	Name	Description
`Real`	`psat_der`	Sublimation pressure derivative

Function Modelica.Media.Air.MoistAir.saturationPressure_der
Derivative function for 'saturationPressure'

Information

Derivative function of saturationPressure

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`Temperature`	`Tsat`	Saturation temperature
`Real`	`dTsat`	Time derivative of saturation temperature

Outputs

Type	Name	Description
`Real`	`psat_der`	Saturation pressure

Function Modelica.Media.Air.MoistAir.saturationTemperature
Return saturation temperature of water as a function of (partial) pressure p

Information

Computes saturation temperature from (partial) pressure via numerical inversion of the function saturationPressure. Therefore additional inputs are required (or the defaults are used) for upper and lower temperature bounds.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`Pressure`	`p`	Pressure
`Temperature`	`T_min`	Lower boundary of solution
`Temperature`	`T_max`	Upper boundary of solution

Outputs

Type	Name	Description
`Temperature`	`T`	Saturation temperature

Function Modelica.Media.Air.MoistAir.HeatCapacityOfWater
Return specific heat capacity of water (liquid only) as a function of temperature T

Information

The specific heat capacity of water (liquid and solid) is calculated using a polynomial approach and data from VDI-Waermeatlas 8. Edition (Db1)

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`Temperature`	`T`	Temperature

Outputs

Type	Name	Description
`SpecificHeatCapacity`	`cp_fl`	Specific heat capacity of liquid

Function Modelica.Media.Air.MoistAir.enthalpyOfWater
Computes specific enthalpy of water (solid/liquid) near atmospheric pressure from temperature T

Information

Specific enthalpy of water (liquid and solid) is computed from temperature using constant properties as follows:

heat capacity of liquid water:4200 J/kg
heat capacity of solid water: 2050 J/kg
enthalpy of fusion (liquid=>solid): 333000 J/kg

Pressure is assumed to be around 1 bar. This function is usually used to determine the specific enthalpy of the liquid or solid fraction of moist air.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`Temperature`	`T`	Temperature

Outputs

Type	Name	Description
`SpecificEnthalpy`	`h`	Specific enthalpy of water

Function Modelica.Media.Air.MoistAir.enthalpyOfWater_der
Derivative function of enthalpyOfWater

Information

Derivative function for enthalpyOfWater.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`Temperature`	`T`	Temperature
`Real`	`dT`	Time derivative of temperature

Outputs

Type	Name	Description
`Real`	`dh`	Time derivative of specific enthalpy

Function Modelica.Media.Air.MoistAir.T_phX
Return temperature as a function of pressure p, specific enthalpy h and composition X

Information

Temperature is computed from pressure, specific enthalpy and composition via numerical inversion of function h_pTX.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`AbsolutePressure`	`p`	Pressure
`SpecificEnthalpy`	`h`	Specific enthalpy
`MassFraction`	`X[:]`	Mass fractions of composition

Outputs

Type	Name	Description
`Temperature`	`T`	Temperature

Function Modelica.Media.Air.MoistAir.h_pTX
Return specific enthalpy of moist air as a function of pressure p, temperature T and composition X

Information

Specific enthalpy of moist air is computed from pressure, temperature and composition with X[1] as the total water mass fraction. The fog region is included for both, ice and liquid fog.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`Pressure`	`p`	Pressure
`Temperature`	`T`	Temperature
`MassFraction`	`X[:]`	Mass fractions of moist air

Outputs

Type	Name	Description
`SpecificEnthalpy`	`h`	Specific enthalpy at p, T, X

Function Modelica.Media.Air.MoistAir.h_pTX_der
Derivative function of h_pTX

Information

Derivative function for h_pTX.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`Pressure`	`p`	Pressure
`Temperature`	`T`	Temperature
`MassFraction`	`X[:]`	Mass fractions of moist air
`Real`	`dp`	Pressure derivative
`Real`	`dT`	Temperature derivative
`Real`	`dX[:]`	Composition derivative

Outputs

Type	Name	Description
`Real`	`h_der`	Time derivative of specific enthalpy

Function Modelica.Media.Air.MoistAir.isentropicEnthalpyApproximation
Approximate calculation of h_is from upstream properties, downstream pressure, gas part only

Information

This icon indicates Modelica functions.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`AbsolutePressure`	`p2`	Downstream pressure
`ThermodynamicState`	`state`	Thermodynamic state at upstream location

Outputs

Type	Name	Description
`SpecificEnthalpy`	`h_is`	Isentropic enthalpy

Function Modelica.Media.Air.MoistAir.specificInternalEnergy_pTX
Return specific internal energy of moist air as a function of pressure p, temperature T and composition X

Information

Specific internal energy is determined from pressure p, temperature T and composition X, assuming that the liquid or solid water volume is negligible.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`Pressure`	`p`	Pressure
`Temperature`	`T`	Temperature
`MassFraction`	`X[:]`	Mass fractions of moist air

Outputs

Type	Name	Description
`SpecificInternalEnergy`	`u`	Specific internal energy

Function Modelica.Media.Air.MoistAir.specificInternalEnergy_pTX_der
Derivative function for specificInternalEnergy_pTX

Information

Derivative function for specificInternalEnergy_pTX.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`Pressure`	`p`	Pressure
`Temperature`	`T`	Temperature
`MassFraction`	`X[:]`	Mass fractions of moist air
`Real`	`dp`	Pressure derivative
`Real`	`dT`	Temperature derivative
`Real`	`dX[:]`	Mass fraction derivatives

Outputs

Type	Name	Description
`Real`	`u_der`	Specific internal energy derivative

Function Modelica.Media.Air.MoistAir.T_psX
Return temperature as a function of pressure p, specific entropy s and composition X

Information

Temperature is computed from pressure, specific entropy and composition via numerical inversion of function specificEntropy.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`AbsolutePressure`	`p`	Pressure
`SpecificEntropy`	`s`	Specific entropy
`MassFraction`	`X[:]`	Mass fractions of composition

Outputs

Type	Name	Description
`Temperature`	`T`	Temperature

Function Modelica.Media.Air.MoistAir.s_pTX
Return specific entropy of moist air as a function of pressure p, temperature T and composition X (only valid for phi<1)

Information

Specific entropy of moist air is computed from pressure, temperature and composition with X[1] as the total water mass fraction.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`Pressure`	`p`	Pressure
`Temperature`	`T`	Temperature
`MassFraction`	`X[:]`	Mass fractions of moist air

Outputs

Type	Name	Description
`SpecificEntropy`	`s`	Specific entropy at p, T, X

Function Modelica.Media.Air.MoistAir.s_pTX_der
Return specific entropy of moist air as a function of pressure p, temperature T and composition X (only valid for phi<1)

Information

Specific entropy of moist air is computed from pressure, temperature and composition with X[1] as the total water mass fraction.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`Pressure`	`p`	Pressure
`Temperature`	`T`	Temperature
`MassFraction`	`X[:]`	Mass fractions of moist air
`Real`	`dp`	Derivative of pressure
`Real`	`dT`	Derivative of temperature
`Real`	`dX[nX]`	Derivative of mass fractions

Outputs

Type	Name	Description
`Real`	`ds`	Specific entropy at p, T, X

Package Modelica.​Media.​Air.​MoistAirAir: Moist air model (190 ... 647 K)

Information

Thermodynamic Model

Range of validity

Transport Properties

Application

Package Contents

Package Constants

Type Modelica.​Media.​Air.​MoistAir.​AbsolutePressureType for absolute pressure with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​DensityType for density with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​DynamicViscosityType for dynamic viscosity with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​EnthalpyFlowRateType for enthalpy flow rate with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​MassFractionType for mass fraction with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​MoleFractionType for mole fraction with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​MolarMassType for molar mass with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​MolarVolumeType for molar volume with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​IsentropicExponentType for isentropic exponent with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​SpecificEnergyType for specific energy with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​SpecificInternalEnergyType for specific internal energy with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​SpecificEnthalpyType for specific enthalpy with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​SpecificEntropyType for specific entropy with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​SpecificHeatCapacityType for specific heat capacity with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​SurfaceTensionType for surface tension with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​TemperatureType for temperature with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​ThermalConductivityType for thermal conductivity with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​PrandtlNumberType for Prandtl number with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​VelocityOfSoundType for velocity of sound with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​ExtraPropertyType for unspecified, mass-specific property transported by flow

Attributes

Type Modelica.​Media.​Air.​MoistAir.​CumulativeExtraPropertyType for conserved integral of unspecified, mass specific property

Attributes

Type Modelica.​Media.​Air.​MoistAir.​ExtraPropertyFlowRateType for flow rate of unspecified, mass-specific property

Attributes

Type Modelica.​Media.​Air.​MoistAir.​IsobaricExpansionCoefficientType for isobaric expansion coefficient with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​DipoleMomentType for dipole moment with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​DerDensityByPressureType for partial derivative of density with respect to pressure with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​DerDensityByEnthalpyType for partial derivative of density with respect to enthalpy with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​DerEnthalpyByPressureType for partial derivative of enthalpy with respect to pressure with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​DerDensityByTemperatureType for partial derivative of density with respect to temperature with medium specific attributes

Attributes

Type Modelica.​Media.​Air.​MoistAir.​DerTemperatureByPressureType for partial derivative of temperature with respect to pressure with medium specific attributes

Attributes

Record Modelica.​Media.​Air.​MoistAir.​SaturationPropertiesSaturation properties of two phase medium

Information

Fields

Record Modelica.​Media.​Air.​MoistAir.​FluidLimitsValidity limits for fluid model

Information

Fields

Type Modelica.​Media.​Air.​MoistAir.​FixedPhasePhase of the fluid: 1 for 1-phase, 2 for two-phase, 0 for not known, e.g., interactive use

Attributes

Record Modelica.​Media.​Air.​MoistAir.​FluidConstantsExtended fluid constants

Information

Fields

Record Modelica.​Media.​Air.​MoistAir.​ThermodynamicStateThermodynamicState record for moist air

Information

Fields

Package Modelica.Media.Air.MoistAir
Air: Moist air model (190 ... 647 K)

Type Modelica.Media.Air.MoistAir.AbsolutePressure
Type for absolute pressure with medium specific attributes

Type Modelica.Media.Air.MoistAir.Density
Type for density with medium specific attributes

Type Modelica.Media.Air.MoistAir.DynamicViscosity
Type for dynamic viscosity with medium specific attributes

Type Modelica.Media.Air.MoistAir.EnthalpyFlowRate
Type for enthalpy flow rate with medium specific attributes

Type Modelica.Media.Air.MoistAir.MassFraction
Type for mass fraction with medium specific attributes

Type Modelica.Media.Air.MoistAir.MoleFraction
Type for mole fraction with medium specific attributes

Type Modelica.Media.Air.MoistAir.MolarMass
Type for molar mass with medium specific attributes

Type Modelica.Media.Air.MoistAir.MolarVolume
Type for molar volume with medium specific attributes

Type Modelica.Media.Air.MoistAir.IsentropicExponent
Type for isentropic exponent with medium specific attributes

Type Modelica.Media.Air.MoistAir.SpecificEnergy
Type for specific energy with medium specific attributes

Type Modelica.Media.Air.MoistAir.SpecificInternalEnergy
Type for specific internal energy with medium specific attributes

Type Modelica.Media.Air.MoistAir.SpecificEnthalpy
Type for specific enthalpy with medium specific attributes

Type Modelica.Media.Air.MoistAir.SpecificEntropy
Type for specific entropy with medium specific attributes

Type Modelica.Media.Air.MoistAir.SpecificHeatCapacity
Type for specific heat capacity with medium specific attributes

Type Modelica.Media.Air.MoistAir.SurfaceTension
Type for surface tension with medium specific attributes

Type Modelica.Media.Air.MoistAir.Temperature
Type for temperature with medium specific attributes

Type Modelica.Media.Air.MoistAir.ThermalConductivity
Type for thermal conductivity with medium specific attributes

Type Modelica.Media.Air.MoistAir.PrandtlNumber
Type for Prandtl number with medium specific attributes

Type Modelica.Media.Air.MoistAir.VelocityOfSound
Type for velocity of sound with medium specific attributes

Type Modelica.Media.Air.MoistAir.ExtraProperty
Type for unspecified, mass-specific property transported by flow

Type Modelica.Media.Air.MoistAir.CumulativeExtraProperty
Type for conserved integral of unspecified, mass specific property

Type Modelica.Media.Air.MoistAir.ExtraPropertyFlowRate
Type for flow rate of unspecified, mass-specific property

Type Modelica.Media.Air.MoistAir.IsobaricExpansionCoefficient
Type for isobaric expansion coefficient with medium specific attributes

Type Modelica.Media.Air.MoistAir.DipoleMoment
Type for dipole moment with medium specific attributes

Type Modelica.Media.Air.MoistAir.DerDensityByPressure
Type for partial derivative of density with respect to pressure with medium specific attributes

Type Modelica.Media.Air.MoistAir.DerDensityByEnthalpy
Type for partial derivative of density with respect to enthalpy with medium specific attributes

Type Modelica.Media.Air.MoistAir.DerEnthalpyByPressure
Type for partial derivative of enthalpy with respect to pressure with medium specific attributes

Type Modelica.Media.Air.MoistAir.DerDensityByTemperature
Type for partial derivative of density with respect to temperature with medium specific attributes

Type Modelica.Media.Air.MoistAir.DerTemperatureByPressure
Type for partial derivative of temperature with respect to pressure with medium specific attributes

Record Modelica.Media.Air.MoistAir.SaturationProperties
Saturation properties of two phase medium

Record Modelica.Media.Air.MoistAir.FluidLimits
Validity limits for fluid model

Type Modelica.Media.Air.MoistAir.FixedPhase
Phase of the fluid: 1 for 1-phase, 2 for two-phase, 0 for not known, e.g., interactive use

Record Modelica.Media.Air.MoistAir.FluidConstants
Extended fluid constants

Record Modelica.Media.Air.MoistAir.ThermodynamicState
ThermodynamicState record for moist air

Model Modelica.Media.Air.MoistAir.BaseProperties
Moist air base properties record

Function Modelica.Media.Air.MoistAir.setState_pTX
Return thermodynamic state as function of pressure p, temperature T and composition X

Function Modelica.Media.Air.MoistAir.setState_phX
Return thermodynamic state as function of pressure p, specific enthalpy h and composition X

Function Modelica.Media.Air.MoistAir.setState_psX
Return thermodynamic state as function of p, s and composition X or Xi

Function Modelica.Media.Air.MoistAir.setState_dTX
Return thermodynamic state as function of density d, temperature T and composition X

Function Modelica.Media.Air.MoistAir.setSmoothState
Return thermodynamic state so that it smoothly approximates: if x > 0 then state_a else state_b

Function Modelica.Media.Air.MoistAir.dynamicViscosity
Return dynamic viscosity as a function of the thermodynamic state record, valid from 123.15 K to 1273.15 K

Function Modelica.Media.Air.MoistAir.thermalConductivity
Return thermal conductivity as a function of the thermodynamic state record, valid from 123.15 K to 1273.15 K

Function Modelica.Media.Air.MoistAir.prandtlNumber
Return the Prandtl number

Function Modelica.Media.Air.MoistAir.pressure
Returns pressure of ideal gas as a function of the thermodynamic state record

Function Modelica.Media.Air.MoistAir.temperature
Return temperature of ideal gas as a function of the thermodynamic state record

Function Modelica.Media.Air.MoistAir.density
Returns density of ideal gas as a function of the thermodynamic state record

Function Modelica.Media.Air.MoistAir.specificEnthalpy
Return specific enthalpy of moist air as a function of the thermodynamic state record

Function Modelica.Media.Air.MoistAir.specificInternalEnergy
Return specific internal energy of moist air as a function of the thermodynamic state record

Function Modelica.Media.Air.MoistAir.specificEntropy
Return specific entropy from thermodynamic state record, only valid for phi<1

Function Modelica.Media.Air.MoistAir.specificGibbsEnergy
Return specific Gibbs energy as a function of the thermodynamic state record, only valid for phi<1

Function Modelica.Media.Air.MoistAir.specificHelmholtzEnergy
Return specific Helmholtz energy as a function of the thermodynamic state record, only valid for phi<1

Function Modelica.Media.Air.MoistAir.specificHeatCapacityCp
Return specific heat capacity at constant pressure as a function of the thermodynamic state record