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

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## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium

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

### Information

This package is identical to Modelica.Media.Interfaces.PartialSimpleIdealGasMedium except that the functions. `density`, `specificEntropy` and `setState_dTX` are declared as `replaceable`. This is required for the implementation of Buildings.Obsolete.Media.GasesPTDecoupled.SimpleAir.

Extends from Modelica.Media.Interfaces.PartialPureSubstance (Base class for pure substances of one chemical substance).

### Package Content

Name | Description
--- | ---
cp_const | Constant specific heat capacity at constant pressure
cv_const=cp_const - R_gas | Constant specific heat capacity at constant volume
R_gas | medium specific gas constant
MM_const | Molar mass
eta_const | Constant dynamic viscosity
lambda_const | Constant thermal conductivity
T_min | Minimum temperature valid for medium model
T_max | Maximum temperature valid for medium model
T0=reference_T | Zero enthalpy temperature
ThermodynamicState | Thermodynamic state of ideal gas
FluidConstants | fluid constants
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
Inherited
setState_pT | Return thermodynamic state from p and T
setState_ph | Return thermodynamic state from p and h
setState_ps | Return thermodynamic state from p and s
setState_dT | Return thermodynamic state from d and T
density_ph | Return density from p and h
temperature_ph | Return temperature from p and h
pressure_dT | Return pressure from d and T
specificEnthalpy_dT | Return specific enthalpy from d and T
specificEnthalpy_ps | Return specific enthalpy from p and s
temperature_ps | Return temperature from p and s
density_ps | Return density from p and s
specificEnthalpy_pT | Return specific enthalpy from p and T
density_pT | Return density from p and T
ThermoStates | Enumeration type for independent variables
mediumName="unusablePartialMedium" | Name of the medium
substanceNames={mediumName} | Names of the mixture substances. Set substanceNames={mediumName} if only one substance.
extraPropertiesNames=fill("", 0) | Names of the additional (extra) transported properties. Set extraPropertiesNames=fill("",0) if unused
singleState | = true, if u and d are not a function of pressure
reducedX=true | = true if medium contains the equation sum(X) = 1.0; set reducedX=true if only one substance (see docu for details)
fixedX=false | = true if medium contains the equation X = reference_X
reference_p=101325 | Reference pressure of Medium: default 1 atmosphere
reference_T=298.15 | Reference temperature of Medium: default 25 deg Celsius
reference_X=fill(1/nX, nX) | Default mass fractions of medium
p_default=101325 | Default value for pressure of medium (for initialization)
T_default=Modelica.SIunits.Conversions.from_degC(20) | Default value for temperature of medium (for initialization)
h_default=specificEnthalpy_pTX(p_default, T_default, X_default) | Default value for specific enthalpy of medium (for initialization)
X_default=reference_X | Default value for mass fractions of medium (for initialization)
nS=size(substanceNames, 1) | Number of substances
nX=nS | Number of mass fractions
nXi=if fixedX then 0 else if reducedX then nS - 1 else nS | Number of structurally independent mass fractions (see docu for details)
nC=size(extraPropertiesNames, 1) | Number of extra (outside of standard mass-balance) transported properties
C_nominal=1.0e-6*ones(nC) | Default for the nominal values for the extra properties
prandtlNumber | Return the Prandtl number
heatCapacity_cp | Alias for deprecated name
heatCapacity_cv | Alias for deprecated name
beta | Alias for isobaricExpansionCoefficient for user convenience
kappa | Alias of isothermalCompressibility for user convenience
density_derp_h | Return density derivative w.r.t. pressure at const specific enthalpy
density_derh_p | Return density derivative w.r.t. specific enthalpy at constant pressure
specificEntropy_pTX | Return specific enthalpy from p, T, and X or Xi
density_pTX | Return density from p, T, 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
MassFlowRate | Type for mass flow rate with medium specific attributes
AbsolutePressure | Type for absolute pressure with medium specific attributes
Density | Type for density with medium specific attributes
DynamicViscosity | Type for dynamic viscosity with medium specific attributes
EnthalpyFlowRate | Type for enthalpy flow rate with medium specific attributes
MassFraction | Type for mass fraction with medium specific attributes
MoleFraction | Type for mole fraction with medium specific attributes
MolarMass | Type for molar mass with medium specific attributes
MolarVolume | Type for molar volume with medium specific attributes
IsentropicExponent | Type for isentropic exponent with medium specific attributes
SpecificEnergy | Type for specific energy with medium specific attributes
SpecificInternalEnergy | Type for specific internal energy with medium specific attributes
SpecificEnthalpy | Type for specific enthalpy with medium specific attributes
SpecificEntropy | Type for specific entropy with medium specific attributes
SpecificHeatCapacity | Type for specific heat capacity with medium specific attributes
SurfaceTension | Type for surface tension with medium specific attributes
Temperature | Type for temperature with medium specific attributes
ThermalConductivity | Type for thermal conductivity with medium specific attributes
PrandtlNumber | Type for Prandtl number with medium specific attributes
VelocityOfSound | Type for velocity of sound with medium specific attributes
ExtraProperty | Type for unspecified, mass-specific property transported by flow
CumulativeExtraProperty | Type for conserved integral of unspecified, mass specific property
ExtraPropertyFlowRate | Type for flow rate of unspecified, mass-specific property
IsobaricExpansionCoefficient | Type for isobaric expansion coefficient with medium specific attributes
DipoleMoment | Type for dipole moment with medium specific attributes
DerDensityByPressure | Type for partial derivative of density with respect to pressure with medium specific attributes
DerDensityByEnthalpy | Type for partial derivative of density with respect to enthalpy with medium specific attributes
DerEnthalpyByPressure | Type for partial derivative of enthalpy with respect to pressure with medium specific attributes
DerDensityByTemperature | Type for partial derivative of density with respect to temperature with medium specific attributes
DerTemperatureByPressure | Type for partial derivative of temperature with respect to pressure with medium specific attributes
SaturationProperties | Saturation properties of two phase medium
FluidLimits | Validity limits for fluid model
FixedPhase | Phase of the fluid: 1 for 1-phase, 2 for two-phase, 0 for not known, e.g., interactive use
Basic | The most basic version of a record used in several degrees of detail
IdealGas | The ideal gas version of a record used in several degrees of detail
TwoPhase | The two phase fluid version of a record used in several degrees of detail

### Types and constants

      constant SpecificHeatCapacity cp_const
      "Constant specific heat capacity at constant pressure";

      constant SpecificHeatCapacity cv_const= cp_const - R_gas
      "Constant specific heat capacity at constant volume";

      constant SpecificHeatCapacity R_gas "medium specific gas constant";

      constant MolarMass MM_const "Molar mass";

      constant DynamicViscosity eta_const "Constant dynamic viscosity";

      constant ThermalConductivity lambda_const "Constant thermal conductivity";

      constant Temperature T_min "Minimum temperature valid for medium model";

      constant Temperature T_max "Maximum temperature valid for medium model";

      constant Temperature T0= reference_T "Zero enthalpy temperature";

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.ThermodynamicState

Thermodynamic state of ideal gas

### Information

Extends from (Minimal variable set that is available as input argument to every medium function).

### Modelica definition

redeclare record extends ThermodynamicState "Thermodynamic state of ideal gas" AbsolutePressure p(start=p_default) "Absolute pressure of medium"; Temperature T(start=T_default) "Temperature of medium"; end ThermodynamicState;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.FluidConstants

fluid constants

### Information

Extends from (Critical, triple, molecular and other standard data of fluid).

### Modelica definition

redeclare record extends FluidConstants "fluid constants" end FluidConstants;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.BaseProperties

Base properties of ideal gas

### Information

This is the most simple incompressible medium model, where specific enthalpy h and specific internal energy u are only a function of temperature T and all other provided medium quantities are assumed to be constant.

Extends from .

### Parameters

Type | Name | Default | Description
--- | --- | --- | ---
Advanced
Boolean | preferredMediumStates | false | = true if StateSelect.prefer shall be used for the independent property variables of the medium

### Modelica definition

redeclare replaceable model extends BaseProperties "Base properties of ideal gas" equation assert(T >= T_min and T <= T_max, " Temperature T (= " + String(T) + " K) is not in the allowed range (" + String(T_min) + " K <= T <= " + String(T_max) + " K) required from medium model \"" + mediumName + "\". "); h = specificEnthalpy_pTX(p,T,X); u = h-R*T; R = R_gas; d = p/(R*T); MM = MM_const; state.T = T; state.p = p; end BaseProperties;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.setState_pTX

Return thermodynamic state from p, T, and X or Xi

### Information

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

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
AbsolutePressure | p |  | Pressure [Pa]
Temperature | T |  | Temperature [K]
MassFraction | X[:] | reference_X | Mass fractions [kg/kg]

### Outputs

Type | Name | Description
--- | --- | ---
ThermodynamicState | state | thermodynamic state record

### Modelica definition

redeclare function setState_pTX "Return thermodynamic state from p, T, and X or Xi" extends Modelica.Icons.Function; input AbsolutePressure p "Pressure"; input Temperature T "Temperature"; input MassFraction X[:]=reference_X "Mass fractions"; output ThermodynamicState state "thermodynamic state record"; algorithm state := ThermodynamicState(p=p,T=T); end setState_pTX;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.setState_phX

Return thermodynamic state from p, h, and X or Xi

### Information

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

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
AbsolutePressure | p |  | Pressure [Pa]
SpecificEnthalpy | h |  | Specific enthalpy [J/kg]
MassFraction | X[:] | reference_X | Mass fractions [kg/kg]

### Outputs

Type | Name | Description
--- | --- | ---
ThermodynamicState | state | thermodynamic state record

### Modelica definition

redeclare function setState_phX "Return thermodynamic state from p, h, and X or Xi" extends Modelica.Icons.Function; input AbsolutePressure p "Pressure"; input SpecificEnthalpy h "Specific enthalpy"; input MassFraction X[:]=reference_X "Mass fractions"; output ThermodynamicState state "thermodynamic state record"; algorithm state := ThermodynamicState(p=p,T=temperature_phX(p, h, X)); end setState_phX;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.setState_psX

Return thermodynamic state from p, s, and X or Xi

### Information

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

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
AbsolutePressure | p |  | Pressure [Pa]
SpecificEntropy | s |  | Specific entropy [J/(kg.K)]
MassFraction | X[:] | reference_X | Mass fractions [kg/kg]

### Outputs

Type | Name | Description
--- | --- | ---
ThermodynamicState | state | thermodynamic state record

### Modelica definition

redeclare replaceable function setState_psX "Return thermodynamic state from p, s, and X or Xi" extends Modelica.Icons.Function; input AbsolutePressure p "Pressure"; input SpecificEntropy s "Specific entropy"; input MassFraction X[:]=reference_X "Mass fractions"; output ThermodynamicState state "thermodynamic state record"; algorithm state := ThermodynamicState(p=p,T=Modelica.Math.exp(s/cp_const + Modelica.Math.log(reference_T)) + R_gas*Modelica.Math.log(p/reference_p)); end setState_psX;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.setState_dTX

Return thermodynamic state from d, T, and X or Xi

### Information

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

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
Density | d |  | density [kg/m3]
Temperature | T |  | Temperature [K]
MassFraction | X[:] | reference_X | Mass fractions [kg/kg]

### Outputs

Type | Name | Description
--- | --- | ---
ThermodynamicState | state | thermodynamic state record

### Modelica definition

redeclare replaceable function setState_dTX "Return thermodynamic state from d, T, and X or Xi" extends Modelica.Icons.Function; input Density d "density"; input Temperature T "Temperature"; input MassFraction X[:]=reference_X "Mass fractions"; output ThermodynamicState state "thermodynamic state record"; algorithm state := ThermodynamicState(p=d*R_gas*T,T=T); end setState_dTX;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.setSmoothState

Return thermodynamic state so that it smoothly approximates: if x > 0 then state_a else state_b

### Information

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

### Inputs

Type | Name | Default | 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)

### Modelica definition

redeclare function extends setSmoothState "Return thermodynamic state so that it smoothly approximates: if x > 0 then state_a else state_b" algorithm state := ThermodynamicState(p=Modelica.Media.Common.smoothStep( x, state_a.p, state_b.p, x_small), T=Modelica.Media.Common.smoothStep( x, state_a.T, state_b.T, x_small)); end setSmoothState;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.pressure

Return pressure of ideal gas

### Information

Extends from (Return pressure).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ThermodynamicState | state |  | Thermodynamic state record

### Outputs

Type | Name | Description
--- | --- | ---
AbsolutePressure | p | Pressure [Pa]

### Modelica definition

redeclare function extends pressure "Return pressure of ideal gas" algorithm p := state.p; end pressure;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.temperature

Return temperature of ideal gas

### Information

Extends from (Return temperature).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ThermodynamicState | state |  | Thermodynamic state record

### Outputs

Type | Name | Description
--- | --- | ---
Temperature | T | Temperature [K]

### Modelica definition

redeclare function extends temperature "Return temperature of ideal gas" algorithm T := state.T; end temperature;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.density

Return density of ideal gas

### Information

Extends from (Return density).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ThermodynamicState | state |  | Thermodynamic state record

### Outputs

Type | Name | Description
--- | --- | ---
Density | d | Density [kg/m3]

### Modelica definition

redeclare replaceable function extends density "Return density of ideal gas" algorithm d := state.p/(R_gas*state.T); end density;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.specificEnthalpy

Return specific enthalpy

### Information

Extends from Modelica.Icons.Function (Icon for functions), (Return specific enthalpy).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ThermodynamicState | state |  | Thermodynamic state record

### Outputs

Type | Name | Description
--- | --- | ---
SpecificEnthalpy | h | Specific enthalpy [J/kg]

### Modelica definition

redeclare function extends specificEnthalpy "Return specific enthalpy" extends Modelica.Icons.Function; algorithm h := cp_const*(state.T-T0); end specificEnthalpy;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.specificInternalEnergy

Return specific internal energy

### Information

Extends from Modelica.Icons.Function (Icon for functions), (Return specific internal energy).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ThermodynamicState | state |  | Thermodynamic state record

### Outputs

Type | Name | Description
--- | --- | ---
SpecificEnergy | u | Specific internal energy [J/kg]

### Modelica definition

redeclare replaceable function extends specificInternalEnergy "Return specific internal energy" extends Modelica.Icons.Function; algorithm // u := (cp_const-R_gas)*(state.T-T0); u := cp_const*(state.T-T0) - R_gas*state.T; end specificInternalEnergy;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.specificEntropy

Return specific entropy

### Information

Extends from Modelica.Icons.Function (Icon for functions), (Return specific entropy).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ThermodynamicState | state |  | Thermodynamic state record

### Outputs

Type | Name | Description
--- | --- | ---
SpecificEntropy | s | Specific entropy [J/(kg.K)]

### Modelica definition

redeclare replaceable function extends specificEntropy "Return specific entropy" extends Modelica.Icons.Function; algorithm s := cp_const*Modelica.Math.log(state.T/T0) - R_gas*Modelica.Math.log(state.p/reference_p); end specificEntropy;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.specificGibbsEnergy

Return specific Gibbs energy

### Information

Extends from Modelica.Icons.Function (Icon for functions), (Return specific Gibbs energy).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ThermodynamicState | state |  | Thermodynamic state record

### Outputs

Type | Name | Description
--- | --- | ---
SpecificEnergy | g | Specific Gibbs energy [J/kg]

### Modelica definition

redeclare function extends specificGibbsEnergy "Return specific Gibbs energy" extends Modelica.Icons.Function; algorithm g := cp_const*(state.T-T0) - state.T*specificEntropy(state); end specificGibbsEnergy;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.specificHelmholtzEnergy

Return specific Helmholtz energy

### Information

Extends from Modelica.Icons.Function (Icon for functions), (Return specific Helmholtz energy).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ThermodynamicState | state |  | Thermodynamic state record

### Outputs

Type | Name | Description
--- | --- | ---
SpecificEnergy | f | Specific Helmholtz energy [J/kg]

### Modelica definition

redeclare function extends specificHelmholtzEnergy "Return specific Helmholtz energy" extends Modelica.Icons.Function; algorithm f := (cp_const-R_gas)*(state.T-T0) - state.T*specificEntropy(state); end specificHelmholtzEnergy;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.dynamicViscosity

Return dynamic viscosity

### Information

Extends from (Return dynamic viscosity).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ThermodynamicState | state |  | Thermodynamic state record

### Outputs

Type | Name | Description
--- | --- | ---
DynamicViscosity | eta | Dynamic viscosity [Pa.s]

### Modelica definition

redeclare function extends dynamicViscosity "Return dynamic viscosity" algorithm eta := eta_const; end dynamicViscosity;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.thermalConductivity

Return thermal conductivity

### Information

Extends from (Return thermal conductivity).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ThermodynamicState | state |  | Thermodynamic state record

### Outputs

Type | Name | Description
--- | --- | ---
ThermalConductivity | lambda | Thermal conductivity [W/(m.K)]

### Modelica definition

redeclare function extends thermalConductivity "Return thermal conductivity" algorithm lambda := lambda_const; end thermalConductivity;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.specificHeatCapacityCp

Return specific heat capacity at constant pressure

### Information

Extends from (Return specific heat capacity at constant pressure).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ThermodynamicState | state |  | Thermodynamic state record

### Outputs

Type | Name | Description
--- | --- | ---
SpecificHeatCapacity | cp | Specific heat capacity at constant pressure [J/(kg.K)]

### Modelica definition

redeclare function extends specificHeatCapacityCp "Return specific heat capacity at constant pressure" algorithm cp := cp_const; end specificHeatCapacityCp;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.specificHeatCapacityCv

Return specific heat capacity at constant volume

### Information

Extends from (Return specific heat capacity at constant volume).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ThermodynamicState | state |  | Thermodynamic state record

### Outputs

Type | Name | Description
--- | --- | ---
SpecificHeatCapacity | cv | Specific heat capacity at constant volume [J/(kg.K)]

### Modelica definition

redeclare function extends specificHeatCapacityCv "Return specific heat capacity at constant volume" algorithm cv := cv_const; end specificHeatCapacityCv;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.isentropicExponent

Return isentropic exponent

### Information

Extends from (Return isentropic exponent).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ThermodynamicState | state |  | Thermodynamic state record

### Outputs

Type | Name | Description
--- | --- | ---
IsentropicExponent | gamma | Isentropic exponent [1]

### Modelica definition

redeclare function extends isentropicExponent "Return isentropic exponent" algorithm gamma := cp_const/cv_const; end isentropicExponent;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.velocityOfSound

Return velocity of sound

### Information

Extends from (Return velocity of sound).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ThermodynamicState | state |  | Thermodynamic state record

### Outputs

Type | Name | Description
--- | --- | ---
VelocityOfSound | a | Velocity of sound [m/s]

### Modelica definition

redeclare function extends velocityOfSound "Return velocity of sound " algorithm a := sqrt(cp_const/cv_const*R_gas*state.T); end velocityOfSound;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.specificEnthalpy_pTX

Return specific enthalpy from p, T, and X or Xi

### Information

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

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
AbsolutePressure | p |  | Pressure [Pa]
Temperature | T |  | Temperature [K]
MassFraction | X[nX] |  | Mass fractions [kg/kg]

### Outputs

Type | Name | Description
--- | --- | ---
SpecificEnthalpy | h | Specific enthalpy at p, T, X [J/kg]

### Modelica definition

redeclare function specificEnthalpy_pTX "Return specific enthalpy from p, T, and X or Xi" extends Modelica.Icons.Function; input AbsolutePressure p "Pressure"; input Temperature T "Temperature"; input MassFraction X[nX] "Mass fractions"; output SpecificEnthalpy h "Specific enthalpy at p, T, X"; algorithm h := cp_const*(T-T0); end specificEnthalpy_pTX;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.temperature_phX

Return temperature from p, h, and X or Xi

### Information

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

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
AbsolutePressure | p |  | Pressure [Pa]
SpecificEnthalpy | h |  | Specific enthalpy [J/kg]
MassFraction | X[nX] |  | Mass fractions [kg/kg]

### Outputs

Type | Name | Description
--- | --- | ---
Temperature | T | Temperature [K]

### Modelica definition

redeclare function temperature_phX "Return temperature from p, h, and X or Xi" extends Modelica.Icons.Function; input AbsolutePressure p "Pressure"; input SpecificEnthalpy h "Specific enthalpy"; input MassFraction X[nX] "Mass fractions"; output Temperature T "Temperature"; algorithm T := h/cp_const + T0; end temperature_phX;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.density_phX

Return density from p, h, and X or Xi

### Information

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

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
AbsolutePressure | p |  | Pressure [Pa]
SpecificEnthalpy | h |  | Specific enthalpy [J/kg]
MassFraction | X[nX] |  | Mass fractions [kg/kg]

### Outputs

Type | Name | Description
--- | --- | ---
Density | d | density [kg/m3]

### Modelica definition

redeclare function density_phX "Return density from p, h, and X or Xi" extends Modelica.Icons.Function; input AbsolutePressure p "Pressure"; input SpecificEnthalpy h "Specific enthalpy"; input MassFraction X[nX] "Mass fractions"; output Density d "density"; algorithm d := density(setState_phX(p,h,X)); end density_phX;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.isentropicEnthalpy

Return isentropic enthalpy

### Information

Extends from (Return isentropic enthalpy).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
AbsolutePressure | p_downstream |  | Downstream pressure [Pa]
ThermodynamicState | refState |  | Reference state for entropy

### Outputs

Type | Name | Description
--- | --- | ---
SpecificEnthalpy | h_is | Isentropic enthalpy [J/kg]

### Modelica definition

redeclare function extends isentropicEnthalpy "Return isentropic enthalpy" algorithm /* s = cp_const*log(refState.T/T0) - R_gas*log(refState.p/reference_p) = cp_const*log(state.T/T0) - R_gas*log(p_downstream/reference_p) log(state.T) = log(refState.T) + (R_gas/cp_const)*(log(p_downstream/reference_p) - log(refState.p/reference_p)) = log(refState.T) + (R_gas/cp_const)*log(p_downstream/refState.p) = log(refState.T) + log( (p_downstream/refState.p)^(R_gas/cp_const) ) = log( refState.T*(p_downstream/refState.p)^(R_gas/cp_const) ) state.T = refstate.T*(p_downstream/refstate.p)^(R_gas/cp_const) */ h_is := cp_const*(refState.T*(p_downstream/refState.p)^(R_gas/cp_const) - T0); end isentropicEnthalpy;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.isobaricExpansionCoefficient

Returns overall the isobaric expansion coefficient beta

### Information

Extends from (Return overall the isobaric expansion coefficient beta).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ThermodynamicState | state |  | Thermodynamic state record

### Outputs

Type | Name | Description
--- | --- | ---
IsobaricExpansionCoefficient | beta | Isobaric expansion coefficient [1/K]

### Modelica definition

redeclare function extends isobaricExpansionCoefficient "Returns overall the isobaric expansion coefficient beta" algorithm /* beta = 1/v * der(v,T), with v = 1/d, at constant pressure p: v = R*T/p der(v,T) = R/p beta = p/(R*T)*R/p = 1/T */ beta := 1/state.T; end isobaricExpansionCoefficient;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.isothermalCompressibility

Returns overall the isothermal compressibility factor

### Information

Extends from (Return overall the isothermal compressibility factor).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ThermodynamicState | state |  | Thermodynamic state record

### Outputs

Type | Name | Description
--- | --- | ---
IsothermalCompressibility | kappa | Isothermal compressibility [1/Pa]

### Modelica definition

redeclare function extends isothermalCompressibility "Returns overall the isothermal compressibility factor" algorithm /* kappa = - 1/v * der(v,p), with v = 1/d at constant temperature T. v = R*T/p der(v,T) = -R*T/p^2 kappa = p/(R*T)*R*T/p^2 = 1/p */ kappa := 1/state.p; end isothermalCompressibility;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.density_derp_T

Returns the partial derivative of density with respect to pressure at constant temperature

### Information

Extends from (Return density derivative w.r.t. pressure at const temperature).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ThermodynamicState | state |  | Thermodynamic state record

### Outputs

Type | Name | Description
--- | --- | ---
DerDensityByPressure | ddpT | Density derivative w.r.t. pressure [s2/m2]

### Modelica definition

redeclare function extends density_derp_T "Returns the partial derivative of density with respect to pressure at constant temperature" algorithm /* d = p/(R*T) ddpT = 1/(R*T) */ ddpT := 1/(R_gas*state.T); end density_derp_T;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.density_derT_p

Returns the partial derivative of density with respect to temperature at constant pressure

### Information

Extends from (Return density derivative w.r.t. temperature at constant pressure).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ThermodynamicState | state |  | Thermodynamic state record

### Outputs

Type | Name | Description
--- | --- | ---
DerDensityByTemperature | ddTp | Density derivative w.r.t. temperature [kg/(m3.K)]

### Modelica definition

redeclare function extends density_derT_p "Returns the partial derivative of density with respect to temperature at constant pressure" algorithm /* d = p/(R*T) ddpT = -p/(R*T^2) */ ddTp := -state.p/(R_gas*state.T*state.T); end density_derT_p;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.density_derX

Returns the partial derivative of density with respect to mass fractions at constant pressure and temperature

### Information

Extends from (Return density derivative w.r.t. mass fraction).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ThermodynamicState | state |  | Thermodynamic state record

### Outputs

Type | Name | Description
--- | --- | ---
Density | dddX[nX] | Derivative of density w.r.t. mass fraction [kg/m3]

### Modelica definition

redeclare function extends density_derX "Returns the partial derivative of density with respect to mass fractions at constant pressure and temperature" algorithm dddX := fill(0,nX); end density_derX;

## Buildings.Obsolete.Media.Interfaces.PartialSimpleIdealGasMedium.molarMass

Returns the molar mass of the medium

### Information

Extends from (Return the molar mass of the medium).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ThermodynamicState | state |  | Thermodynamic state record

### Outputs

Type | Name | Description
--- | --- | ---
MolarMass | MM | Mixture molar mass [kg/mol]

### Modelica definition

redeclare function extends molarMass "Returns the molar mass of the medium" algorithm MM := MM_const; end molarMass;