FCSys.Subregions.Examples.PhaseChange

Examples of phase change

Information

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

Package Content

Name	Description
Evaporation	Evaporation of H2O
Hydration	Test absorption of H2O vapor into the ionomer

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FCSys.Subregions.Examples.PhaseChange.Evaporation

Evaporation of H₂O

Information

Initially, the water vapor is below saturation and a small amount of liquid water is present (1/1000 of the total volume). Some of the liquid evaporates until saturation is reached. The boundaries are adiabatic; therefore, the temperature of the liquid and the gas decreases due to the enthalpy of formation.

See also Characteristics.Examples.SaturationPressure. Extends from Examples.Subregion (Single subregion, with H₂ by default).

Parameters

Type	Name	Default	Description
Species
Boolean	'inclC+'	true	Carbon plus (C+)
Boolean	'inclSO3-'	false	Nafion sulfonate (C19HF37O5S-, abbreviated as SO3-)
Boolean	'incle-'	false	Electrons (e-)
Boolean	'inclH+'	false	Protons (H+)
Boolean	inclH2	false	Hydrogen (H2)
Boolean	inclH2O	true	Water vapor (H2O)
Boolean	inclN2	false	Nitrogen (N2)
Boolean	inclO2	false	Oxygen (O2)

Modelica definition

model Evaporation "Evaporation of H2O"

  output Q.Pressure p_sat=Characteristics.H2O.p_sat(subregion.gas.H2O.T) 
    "Saturation pressure via Modelica.Media";

  extends Examples.Subregion(
    inclH2O=true,
    inclH2=false,
    'inclC+'=true,
    subregion(liquid(inclH2O=inclH2O, H2O(epsilon_IC=0.001)), gas(H2O(p_IC=U.kPa))));

end Evaporation;

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FCSys.Subregions.Examples.PhaseChange.Hydration

Test absorption of H₂O vapor into the ionomer

Information

The water vapor is held at saturation pressure at the environmental temperature Water is supplied as necessary to maintain this condition. The ionomer begins with hydration of λ = 8 and comes to equilibrium at approximately λ ≈ 14 in about a half an hour.

See also Characteristics.Examples.HydrationLevel.

Extends from Examples.Subregion (Single subregion, with H₂ by default).

Parameters

Type	Name	Default	Description
Species
Boolean	'inclC+'	false	Carbon plus (C+)
Boolean	'inclSO3-'	true	Nafion sulfonate (C19HF37O5S-, abbreviated as SO3-)
Boolean	'incle-'	false	Electrons (e-)
Boolean	'inclH+'	false	Protons (H+)
Boolean	inclH2	false	Hydrogen (H2)
Boolean	inclH2O	false	Water vapor (H2O)
Boolean	inclN2	true	Nitrogen (N2)
Boolean	inclO2	false	Oxygen (O2)

Modelica definition

model Hydration 
  "Test absorption of H2O vapor into the ionomer"
  extends Examples.Subregion(
    'inclSO3-'=true,
    inclN2=true,
    inclH2=false,
    subregion(
      gas(N2(
          consMaterial=ConsThermo.IC,
          consEnergy=ConsThermo.IC,
          p_IC=environment.p)),
      liquid(inclH2O=true, H2O(
          consMaterial=ConsThermo.IC,
          consEnergy=ConsThermo.IC,
          N(stateSelect=StateSelect.always),
          epsilon_IC=0.3)),
      ionomer(
        inclH2O=true,
        'SO3-'(consEnergy=ConsThermo.IC,epsilon=0.3),
        H2O(lambda_IC=8,initEnergy=Init.none))),
    environment(T=333.15*U.K, RH=1));

end Hydration;