Description: "Collection of models that illustrate model use and test models"

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## 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.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 conv(unit="K/s") = 1 "Conversion factor to satisfy unit check"; initial equation hLiqSym = hLiqCod; hSteSym = hSteCod; hAirSym = hAirCod; equation hLiqCod=Medium.enthalpyOfLiquid(conv*time); der(hLiqCod)=der(hLiqSym); assert(abs(hLiqCod-hLiqSym) < 1E-2, "Model has an error"); hSteCod=Medium.enthalpyOfCondensingGas(conv*time); der(hSteCod)=der(hSteSym); assert(abs(hSteCod-hSteSym) < 1E-2, "Model has an error"); hAirCod=Medium.enthalpyOfDryAir(conv*time); 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 | PartialCondensingGases |
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;