Buildings.Media.Specialized.Water.Examples

Collection of models that test the water models

Information

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

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

Package Content

Name	Description
TemperatureDependentDensityDerivativeCheck	Model that tests the derivative implementation
TemperatureDependentDensityProperties	Model that tests the implementation of the fluid properties
TemperatureDependentDensityTemperatureEnthalpyInversion	Model to check computation of h(T) and its inverse
WaterProperties_pT	Model that tests the implementation of the fluid properties at nominal conditions

Buildings.Media.Specialized.Water.Examples.TemperatureDependentDensityDerivativeCheck

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 TemperatureDependentDensityDerivativeCheck "Model that tests the derivative implementation" extends Modelica.Icons.Example; package Medium = Buildings.Media.Specialized.Water.TemperatureDependentDensity "Medium model"; Modelica.Units.SI.Temperature T "Temperature"; Modelica.Units.SI.SpecificEnthalpy hLiqSym "Liquid phase enthalpy"; Modelica.Units.SI.SpecificEnthalpy hLiqCod "Liquid phase enthalpy"; Modelica.Units.SI.SpecificHeatCapacity cpSym "Specific heat capacity"; Modelica.Units.SI.SpecificHeatCapacity cpCod "Specific heat capacity"; Modelica.Units.SI.SpecificHeatCapacity cvSym "Specific heat capacity"; Modelica.Units.SI.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 TemperatureDependentDensityDerivativeCheck;

Buildings.Media.Specialized.Water.Examples.TemperatureDependentDensityProperties

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]
Real	errAbs	1E-8	Absolute error used in the check of the state calculations

Connectors

Type	Name	Description
replaceable package Medium

Modelica definition

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

Buildings.Media.Specialized.Water.Examples.TemperatureDependentDensityTemperatureEnthalpyInversion

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 with a controlleable tolerance).

Parameters

Type	Name	Default	Description
replaceable package Medium		PartialMedium
Temperature	T0	273.15 + 20	Temperature [K]
Real	tol	1E-8	Numerical tolerance

Connectors

Type	Name	Description
replaceable package Medium

Modelica definition

model TemperatureDependentDensityTemperatureEnthalpyInversion "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.Specialized.Water.TemperatureDependentDensity); end TemperatureDependentDensityTemperatureEnthalpyInversion;

Buildings.Media.Specialized.Water.Examples.WaterProperties_pT

Model that tests the implementation of the fluid properties at nominal conditions

Information

This example checks the thermophysical properties of the medium Buildings.Media.Specialized.Water.Examples.WaterProperties_pT.

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	273.15 + 150	Maximum temperature for the simulation [K]
Pressure	p	Medium.p_default	Pressure [Pa]
MassFraction	X[Medium.nX]	Medium.X_default	Mass fraction [1]
Real	errAbs	1E-8	Absolute error used in the check of the state calculations

Connectors

Type	Name	Description
replaceable package Medium

Modelica definition

model WaterProperties_pT "Model that tests the implementation of the fluid properties at nominal conditions" extends Modelica.Icons.Example; extends Buildings.Media.Examples.BaseClasses.FluidProperties( redeclare package Medium = Buildings.Media.Specialized.Water.ConstantProperties_pT ( T_nominal=273.15+100, p_nominal=5e5), TMin=273.15, TMax=273.15+150); equation // Check the implementation of the base properties basPro.state.p=p; basPro.state.T=T; end WaterProperties_pT;