Buildings.Media.Specialized.Air.Examples

Collection of models that illustrate model use and test models

Information

This package contains examples for the use of models that can be found in Buildings.Media.Specialized.Air.

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

Package Content

Name	Description
PerfectGasDerivativeCheck
PerfectGasTemperatureEnthalpyInversion	Model to check computation of h(T) and its inverse
PerfectGasTestImplementation

Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck

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 PerfectGasDerivativeCheck extends Modelica.Icons.Example; package Medium = Buildings.Media.Specialized.Air.PerfectGas; Modelica.SIunits.Temperature T "Temperature"; 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"; constant Real convT(unit="K/s3") = 270 "Conversion factor to satisfy unit check"; initial equation hLiqSym = hLiqCod; hSteSym = hSteCod; hAirSym = hAirCod; 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"); hSteCod=Medium.enthalpyOfCondensingGas(T); der(hSteCod)=der(hSteSym); assert(abs(hSteCod-hSteSym) < 1E-2, "Model has an error"); hAirCod=Medium.enthalpyOfDryAir(T); der(hAirCod)=der(hAirSym); assert(abs(hAirCod-hAirSym) < 1E-2, "Model has an error"); end PerfectGasDerivativeCheck;

Buildings.Media.Specialized.Air.Examples.PerfectGasTemperatureEnthalpyInversion

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 PerfectGasTemperatureEnthalpyInversion "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.Air.PerfectGas); end PerfectGasTemperatureEnthalpyInversion;

Buildings.Media.Specialized.Air.Examples.PerfectGasTestImplementation

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 PerfectGasTestImplementation extends Modelica.Icons.Example; extends Modelica.Media.Examples.Tests.Components.PartialTestModel( redeclare package Medium = Buildings.Media.Specialized.Air.PerfectGas); end PerfectGasTestImplementation;