Hello Thandiwe,

Gas turbines convert chemical into mechanical energy via thermal energy, which is why the efficiency is considerably limited by carnot's theorem, see the attached wiki link.

Fuel cells convert chemical energy directly into electrical energy such that carnot's limit does not apply, and thus the efficiency should be considerably higher. Note that the efficiency of converting mechanical to electrical energy should be a number in the high 90% region.

Therefore, if you have 1kg/hr hydrogen you have a fixed amount of chemical energy/power, which should give you more electrical power if you react it in a fuel cell.

http://en.wikipedia.org/w/index.php?title=Carnot%27s_theorem_(thermodynamics)&oldid=630595143

take the following example might help you:

50litres of H2O contains 50*2/18 = 5.556Kg of H2.

energy content of hydrogen is 141.9MJ/Kg

Therefore energy content of H2 from 50litres of H2O = 141.99MJ/Kg *5.556 Kg = 788Mj or 219KWh.

for more see the attchments

Thank you, thank you Christian and Mohamad. This is helpful