A PEMFC with a single cell voltage of 0.65V operating at 60 degC produces 10 kW power. The humidity of the input air which is maintained at 40 degC...

A PEMFC with a single cell voltage of 0.65V operating at 60 degC produces 10 kW power. The humidity of the input air which is maintained at 40 degC is 60%. The exit

air needs to maintain its humidity at 82% at 60 degC. The inlet air pressure is 110 kPa and the exit air pressure is 100 kPa.

a. Calculate the partial pressures of water in the inlet and exit air

b. Calculate the air stoichiometry, required to maintain the exit air humidity at 82% at 60 degC.

c. Water can be added to the inlet air to achieve the required humidity. Calculate the mass flow rate of water needed at the inlet air at 60% humidity and 40 degC to get exit

air humidity of 82% at 60 degC

d. Can the required water flow rate calculated above be supplied from the rate of water

produced by the fuel cell reaction? Explain.