.FuelCellLib.Basics.vc_act

Information

vc_act-Control Volume


The balance of oxygen is shown in next eq., the 2nd term in the right show the usage of oxygen in electrochemical reaction.

The balance of steam water is shown in next eq., the 2nd term in the right show the water production in electrochemical reaction and the 3rd term show the balance ratio of liquid water and steam water.

The balance of liquid water is shown in next eq., the 2nd term in the right show tthe balance ratio of liquid water and steam water .

The next equation shows the charge balance in the electrochemical reaction.

These equations show the variables that are part in the liquid and steam water balance.

The maximum water load in active layer is shown next and it depends on the density of water, membrane and solid, and the volume of electrolyte and the solid.

The pore volume is the blank space that doesn't fill the electrolyte, liquid water and solid volume.

Butler-Bolmer equation represents the electrochemical reaction in cathalic layer . The Butler-Bolmer eq. is shown where there is included the limit current (2nd eq.) and the 2nd term in the right is a variable modeling hypothesis, this is the pseudo-capacitance of double layer. The user can select with "ModHyp1" both pseudo-capacitance or non pseudo-capacitance dependence in electrochemical reaction. "ModHyp1" is located in "ACT_LAYER" in the Layers1D package.

Parameters

NameDefaultDescription
av Specific condensation surface [m2/m3]
b Material transfer coeficient [m/s]
Es Volumetric fraction of solid
Ee Volumetric fraction of electrolyte
T Operation temperature of active layer [K]
da Thickness of transport phenomena [m]
Aioref Catalyst area and reference exchange current density [A/m3]
poa Reference pressure for the current limit [Pa]
B Tafel slope [V]
posat Reference Saturation pressure [Pa]
Tosat Reference Saturation temperature [K]
rom Density of the electrolyte [kg/m3]
ros Density of the solid [kg/m3]
roh2ol Density of water [kg/m3]
jlim Limit current [A]
cdl Electrical capacity of double layer [F]
ModHyp1 Psuedocapacitance dependence(0:Off,1:On)


References


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