If a fuel cell has a reversible voltage of E1 at p = p1 and T = T1, write an expression for the temperature T2 that would be required to maintain the fuel cell voltage at E1 if the cell pressure is adjusted to p2. (b) For a H2–O2 fuel cell operating at room temperature and atmospheric pressure (on pure oxygen), what temperature would be required to maintain the original reversible voltage if the operating pressure is reduced by one order of magnitude?

Abrayton cycle operates with a regenerator on the air-standard with properties evaluated at 400 k. the tem- perature of the air entering the compressor is 350k while the temperature of the air exiting the compressor is 600 k. the temperature of the air entering the turbine is 1600 k. the overall cycle produced 600 kj/kg of net work out. assuming a regenerator effectiveness of 0.8, what is the temperature of the air before heat addition (combustion)? draw this process on a t - s diagram