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
Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck PerfectGasDerivativeCheck  
Buildings.Media.Specialized.Air.Examples.PerfectGasTemperatureEnthalpyInversion PerfectGasTemperatureEnthalpyInversion Model to check computation of h(T) and its inverse

Buildings.Media.Specialized.Air.Examples.PerfectGasDerivativeCheck 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 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 with a controlleable tolerance).

Parameters

TypeNameDefaultDescription
replaceable package MediumPartialMedium 
TemperatureT0273.15 + 20Temperature [K]
Realtol1E-8Numerical tolerance

Connectors

TypeNameDescription
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;