stoich_H2 1.2 "Hydrogen flow stoichiometry"
stoich_O2 2.5 "Oxygen flow stoichiometry"
RH_an 25[%] "Inlet relative humidity, anode side"
RH_cath 75[%] "Inlet relative humidity, cathode side"
T 70[degC] "Cell temperature"
I_avg_init 0.01[A/cm^2] "Initial average current density in sweep"
I_avg_final 1[A/cm^2] "Final average current density in sweep"
L_CL 10[um] "Catalytic layer thickness"
i0_H2_ref 1e2[A/m^2] "Exchange current density, hydrogen oxidation"
i0_O2_ref 1e-4[A/m^2] "Exchange current density, oxygen reduction"
a_CL 5e7[m^2/m^3] "Specific area, catalytic layers"
sigmas_GDL_IP 5000[S/m] "Electric in-plane conductivity, gas diffusion layer"
sigmas_GDL_TP 200[S/m] "Electric thru-plane conductivity, gas diffusion layer"
kappag_GDL 5e-12[m^2] "Gas permeability, gas diffusion layer"
alphaa_O2 3 "Anodic transfer coefficient, oxygen reduction"
epsg_GDL 1-epss_GDL "Gas phase volume fraction, gas diffusion layers"
epss_GDL 0.4 "Solid phase volume fraction, gas diffusion layer"
I_avg I_avg_init "Average cell current density"
A_plate L_plate*W_plate "Cell area"
I_flow max(I_avg,0.1[A/cm^2])*A_plate "Total current for stoichiometric flow calculations"
I_tot I_avg*A_plate "Total cell current"
Rc 1e-7[ohm*m^2] "Contact Resistance"
j_H2 stoich_H2*I_flow/(2*F_const) "Hydrogen molar flow rate"
j_H2O_an j_H2*x_H2O_an/x_H2 "Vapor molar flow rate, anode side"
j_H2O_cath j_O2*x_H2O_cath/x_O2_cath "Vapor molar flow rate, cathode side"
j_N2 j_O2*x_N2_cath/x_O2_cath "Nitrogen molar flow rate"
j_O2 stoich_O2*I_flow/(4*F_const) "Oxygen molar flow rate"
m_an m_H2O_an+m_H2 "Anode total mass flow rate"
m_cath m_O2+m_N2+m_H2O_cath "Cathode total mass flow rate"
m_H2 j_H2*2[g/mol] "Hydrogen mass flow rate"
m_H2O_an j_H2O_an*18[g/mol] "Vapor mass flow rate, anode side"
m_H2O_cath j_H2O_cath*18[g/mol] "Vapor mass flow rate, cathode side"
m_N2 j_N2*28[g/mol] "Nitrogen mass flow rate"
m_O2 j_O2*32[g/mol] "Oxygen mass flow rate"
w_H2O_an m_H2O_an/m_an "Water mass fraction in anode flow stream"
w_H2O_cath m_H2O_cath/m_cath "Water mass fraction in cathode flow stream"
w_N2 m_N2/m_cath "Nitrogen mass fraction in cathode flow stream"
x_H2 1-x_H2O_an "Hydrogen molar fraction in anode flow stream"
T_hum T "Humidification temperature"
p_vapor 0.61121*exp((18.678-(T_hum-0[degC])/234.5[K])*((T_hum-0[degC])/(257.14+T_hum-0[degC])))[kPa] "Vapor pressure"
x_H2O_an RH_an*p_vapor/1[atm] "Vapor molar fraction in anode flow stream"
x_H2O_cath RH_cath*p_vapor/1[atm] "Vapor molar fraction in cathode flow stream"
x_N2_cath 1-x_O2_cath-x_H2O_cath "Nitrogen molar fraction in cathode flow stream"
x_O2_cath 0.21*(1-x_H2O_cath) "Oxygen molar fraction in cathode flow stream"