Buildings.Media.Examples

Collection of models that test the media models

Information

This package contains examples that test the media packages in Buildings.Media.

Extends from Modelica.Icons.ExamplesPackage (Icon for packages containing runnable examples).

Package Content

Name	Description
AirDerivativeCheck	Model that tests the derivative implementation
AirProperties	Model that tests the implementation of the fluid properties
AirTemperatureEnthalpyInversion	Model to check computation of h(T) and its inverse
AirTestImplementation	Model that tests the medium implementation
WaterDerivativeCheck	Model that tests the derivative implementation
WaterProperties	Model that tests the implementation of the fluid properties
WaterTemperatureEnthalpyInversion	Model to check computation of h(T) and its inverse
WaterTestImplementation	Model that tests the medium implementation
BaseClasses	Package with base classes for Buildings.Media.Examples

Buildings.Media.Examples.AirDerivativeCheck

Model that tests the derivative implementation

Information

This example checks whether the function derivative is implemented correctly. If the derivative implementation is not correct, the model will stop with an assert statement.

Extends from Modelica.Icons.Example (Icon for runnable examples).

Modelica definition

model AirDerivativeCheck "Model that tests the derivative implementation" extends Modelica.Icons.Example; package Medium = Buildings.Media.Air; Modelica.SIunits.Temperature T "Temperature"; Modelica.SIunits.MassFraction X[1] "Water vapor mass fraction"; Modelica.SIunits.SpecificEnthalpy hLiqSym "Liquid phase enthalpy"; Modelica.SIunits.SpecificEnthalpy hLiqCod "Liquid phase enthalpy"; Modelica.SIunits.SpecificEnthalpy hSteSym "Water vapor enthalpy"; Modelica.SIunits.SpecificEnthalpy hSteCod "Water vapor enthalpy"; Modelica.SIunits.SpecificEnthalpy hAirSym "Dry air enthalpy"; Modelica.SIunits.SpecificEnthalpy hAirCod "Dry air enthalpy"; Modelica.SIunits.SpecificHeatCapacity cpSym "Specific heat capacity"; Modelica.SIunits.SpecificHeatCapacity cpCod "Specific heat capacity"; Modelica.SIunits.SpecificHeatCapacity cvSym "Specific heat capacity"; Modelica.SIunits.SpecificHeatCapacity cvCod "Specific heat capacity"; constant Real convT(unit="K/s3") = 270 "Conversion factor to satisfy unit check"; constant Real convX(unit="1/s3") = 0.01 "Conversion factor to satisfy unit check"; initial equation hLiqSym = hLiqCod; hSteSym = hSteCod; hAirSym = hAirCod; cpSym = cpCod; cvSym = cvCod; equation T = 273.15+convT*time^3; X = {0.001}+convX*time^3*{1}; hLiqCod=Medium.enthalpyOfLiquid(T); der(hLiqCod)=der(hLiqSym); assert(abs(hLiqCod-hLiqSym) < 1E-2, "Model has an error"); hSteCod=Medium.enthalpyOfCondensingGas(T); der(hSteCod)=der(hSteSym); assert(abs(hSteCod-hSteSym) < 1E-2, "Model has an error"); hAirCod=Medium.enthalpyOfNonCondensingGas(T); der(hAirCod)=der(hAirSym); assert(abs(hAirCod-hAirSym) < 1E-2, "Model has an error"); cpCod=Medium.specificHeatCapacityCp( Medium.setState_pTX( p=1e5, T=T, X=X)); der(cpCod)=der(cpSym); assert(abs(cpCod-cpSym) < 1E-2, "Model has an error"); cvCod=Medium.specificHeatCapacityCv( Medium.setState_pTX( p=1e5, T=T, X=X)); der(cvCod)=der(cvSym); assert(abs(cvCod-cvSym) < 1E-2, "Model has an error"); end AirDerivativeCheck;

Buildings.Media.Examples.AirProperties

Model that tests the implementation of the fluid properties

Information

This example checks thermophysical properties of the medium.

Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Media.Examples.BaseClasses.FluidProperties (Model that tests the implementation of the fluid properties).

Parameters

Type	Name	Default	Description
replaceable package Medium		PartialMedium
Temperature	TMin	273.15 - 30	Minimum temperature for the simulation [K]
Temperature	TMax	273.15 + 60	Maximum temperature for the simulation [K]
Pressure	p	Medium.p_default	Pressure [Pa]
MassFraction	X[Medium.nX]	Medium.X_default	Mass fraction [1]

Connectors

Type	Name	Description
replaceable package Medium

Modelica definition

model AirProperties "Model that tests the implementation of the fluid properties" extends Modelica.Icons.Example; extends Buildings.Media.Examples.BaseClasses.FluidProperties( redeclare package Medium = Buildings.Media.Air, TMin=273.15-30, TMax=273.15+60); Modelica.SIunits.SpecificEnthalpy hLiq "Specific enthalpy of liquid"; equation // Check the implementation of the base properties basPro.state.p=p; basPro.state.T=T; basPro.state.X[1]=X[1]; hLiq = Medium.enthalpyOfLiquid(T); if Medium.nX == 1 then assert(abs(h-hLiq) < 1e-8, "Error in enthalpy computation."); end if; end AirProperties;

Buildings.Media.Examples.AirTemperatureEnthalpyInversion

Model to check computation of h(T) and its inverse

Information

This model tests whether the inversion of temperature and enthalpy is implemented correctly. If T ≠ T(h(T)), the model stops with an error.

Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Media.Examples.BaseClasses.TestTemperatureEnthalpyInversion (Model to check computation of h(T) and its inverse).

Parameters

Type	Name	Default	Description
replaceable package Medium		PartialMedium
Temperature	T0	273.15 + 20	Temperature [K]

Connectors

Type	Name	Description
replaceable package Medium

Modelica definition

model AirTemperatureEnthalpyInversion "Model to check computation of h(T) and its inverse" extends Modelica.Icons.Example; extends Buildings.Media.Examples.BaseClasses.TestTemperatureEnthalpyInversion ( redeclare package Medium = Buildings.Media.Air); end AirTemperatureEnthalpyInversion;

Buildings.Media.Examples.AirTestImplementation

Model that tests the medium implementation

Buildings.Media.Examples.AirTestImplementation

Information

This is a simple test for the medium model. It uses the test model described in Modelica.Media.UsersGuide.MediumDefinition.TestOfMedium.

Extends from Modelica.Icons.Example (Icon for runnable examples), Modelica.Media.Examples.Tests.Components.PartialTestModel (Basic test model to test a medium).

Parameters

Type	Name	Default	Description
replaceable package Medium		PartialMedium	Medium model
AbsolutePressure	p_start	Medium.p_default	Initial value of pressure [Pa]
Temperature	T_start	Medium.T_default	Initial value of temperature [K]
SpecificEnthalpy	h_start	Medium.h_default	Initial value of specific enthalpy [J/kg]
Real	X_start[Medium.nX]	Medium.X_default	Initial value of mass fractions

Connectors

Type	Name	Description
replaceable package Medium		Medium model

Modelica definition

model AirTestImplementation "Model that tests the medium implementation" extends Modelica.Icons.Example; extends Modelica.Media.Examples.Tests.Components.PartialTestModel( redeclare package Medium = Buildings.Media.Air); end AirTestImplementation;

Buildings.Media.Examples.WaterDerivativeCheck

Model that tests the derivative implementation

Information

This example checks whether the function derivative is implemented correctly. If the derivative implementation is not correct, the model will stop with an assert statement.

Extends from Modelica.Icons.Example (Icon for runnable examples).

Modelica definition

model WaterDerivativeCheck "Model that tests the derivative implementation" extends Modelica.Icons.Example; package Medium = Buildings.Media.Water; Modelica.SIunits.Temperature T "Temperature"; Modelica.SIunits.SpecificEnthalpy hLiqSym "Liquid phase enthalpy"; Modelica.SIunits.SpecificEnthalpy hLiqCod "Liquid phase enthalpy"; Modelica.SIunits.SpecificHeatCapacity cpSym "Specific heat capacity"; Modelica.SIunits.SpecificHeatCapacity cpCod "Specific heat capacity"; Modelica.SIunits.SpecificHeatCapacity cvSym "Specific heat capacity"; Modelica.SIunits.SpecificHeatCapacity cvCod "Specific heat capacity"; constant Real convT(unit="K/s3") = 270 "Conversion factor to satisfy unit check"; initial equation hLiqSym = hLiqCod; cpSym = cpCod; cvSym = cvCod; equation T = 273.15+convT*time^3; hLiqCod=Medium.enthalpyOfLiquid(T); der(hLiqCod)=der(hLiqSym); assert(abs(hLiqCod-hLiqSym) < 1E-2, "Model has an error"); cpCod=Medium.specificHeatCapacityCp( Medium.setState_pTX( p=1e5, T=T, X=Medium.X_default)); der(cpCod)=der(cpSym); assert(abs(cpCod-cpSym) < 1E-2, "Model has an error"); cvCod=Medium.specificHeatCapacityCv( Medium.setState_pTX( p=1e5, T=T, X=Medium.X_default)); der(cvCod)=der(cvSym); assert(abs(cvCod-cvSym) < 1E-2, "Model has an error"); end WaterDerivativeCheck;

Buildings.Media.Examples.WaterProperties

Model that tests the implementation of the fluid properties

Information

This example checks thermophysical properties of the medium.

Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Media.Examples.BaseClasses.FluidProperties (Model that tests the implementation of the fluid properties).

Parameters

Type	Name	Default	Description
replaceable package Medium		PartialMedium
Temperature	TMin	273.15	Minimum temperature for the simulation [K]
Temperature	TMax	373.15	Maximum temperature for the simulation [K]
Pressure	p	Medium.p_default	Pressure [Pa]
MassFraction	X[Medium.nX]	Medium.X_default	Mass fraction [1]

Connectors

Type	Name	Description
replaceable package Medium

Modelica definition

model WaterProperties "Model that tests the implementation of the fluid properties" extends Modelica.Icons.Example; extends Buildings.Media.Examples.BaseClasses.FluidProperties( redeclare package Medium = Buildings.Media.Water, TMin=273.15, TMax=373.15); equation // Check the implementation of the base properties basPro.state.p=p; basPro.state.T=T; end WaterProperties;

Buildings.Media.Examples.WaterTemperatureEnthalpyInversion

Model to check computation of h(T) and its inverse

Information

This model tests whether the inversion of temperature and enthalpy is implemented correctly. If T ≠ T(h(T)), the model stops with an error.

Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Media.Examples.BaseClasses.TestTemperatureEnthalpyInversion (Model to check computation of h(T) and its inverse).

Parameters

Type	Name	Default	Description
replaceable package Medium		PartialMedium
Temperature	T0	273.15 + 20	Temperature [K]

Connectors

Type	Name	Description
replaceable package Medium

Modelica definition

model WaterTemperatureEnthalpyInversion "Model to check computation of h(T) and its inverse" extends Modelica.Icons.Example; extends Buildings.Media.Examples.BaseClasses.TestTemperatureEnthalpyInversion ( redeclare package Medium = Buildings.Media.Water); end WaterTemperatureEnthalpyInversion;

Buildings.Media.Examples.WaterTestImplementation

Model that tests the medium implementation

Buildings.Media.Examples.WaterTestImplementation

Information

This is a simple test for the medium model. It uses the test model described in Modelica.Media.UsersGuide.MediumDefinition.TestOfMedium.

Extends from Modelica.Icons.Example (Icon for runnable examples), Modelica.Media.Examples.Tests.Components.PartialTestModel (Basic test model to test a medium).

Parameters

Type	Name	Default	Description
replaceable package Medium		PartialMedium	Medium model
AbsolutePressure	p_start	Medium.p_default	Initial value of pressure [Pa]
Temperature	T_start	Medium.T_default	Initial value of temperature [K]
SpecificEnthalpy	h_start	Medium.h_default	Initial value of specific enthalpy [J/kg]
Real	X_start[Medium.nX]	Medium.X_default	Initial value of mass fractions

Connectors

Type	Name	Description
replaceable package Medium		Medium model

Modelica definition

model WaterTestImplementation "Model that tests the medium implementation" extends Modelica.Icons.Example; extends Modelica.Media.Examples.Tests.Components.PartialTestModel( redeclare package Medium = Buildings.Media.Water); end WaterTestImplementation;