Notations | ||
Active surface of fuel cell/m2 | ||
Specific internal energy/(kJ·kg-1) | ||
c | Heat capacity/(J·kg-1·K-1) or mole concentrations of species | |
F | Faraday constant/(C·mol-1) or molar flow rate/(mol·s-1) | |
G | Gas flow rate/(kg·s-1) | |
h | Heat transfer coefficient (W·m-2·K-1) or channel height (m) or specific enthalpy (kJ·kg-1) | |
Enthalpy change of the reaction/(J·mol-1) | ||
K | Equilibrium constant of reaction | |
k | Thermal conductivity/(W·K-1·m-1) or channel heat transfer coefficient/(kJ·m-2·s-1·K-1) | |
I | current density/(A·m-2) | |
Flow rate | ||
Pressure/Pa or power density/(W·m-2) | ||
Partial pressure/Pa | ||
Q | Heat flow/W | |
R | Gas constant/(J·mol-1·K-1) or resistance/ | |
Reaction rate/(mol·s-1) | ||
T | Temperature/K | |
U | Voltage/V | |
u | Flow velocities/(m·s-1) | |
W | Power | |
x | Mole fraction or direction of air flow | |
Greek symbols | ||
Efficiency | ||
Density/(kg·m-3) or ohmic resistance/() | ||
Compression pressure ratio or radiation coefficient | ||
Expansion pressure ratio or thickness/m | ||
Thickness/m | ||
Stefan-Boltzmann constant/(5.6710-8 W·m-2·K-4) | ||
Thermal conductivity/(kW·m-1·K) | ||
Subscripts | ||
C | Compressor | |
Fu | Fuel | |
F | Fuel channel | |
PEN | Positive-Electrolyte-Negative | |
Op | Over potential | |
Ocp | Open circuit potential | |
Ref | Reforming reaction | |
Shi | Water-gas shift reaction | |
Elc | Electrochemical reaction | |
T | Turbine |