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Questiions on fuel cells and betteries.........................................................

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Questiions on fuel cells and betteries.........................................................
Answered Same Day Dec 26, 2021

Solution

David answered on Dec 26 2021
112 Votes
Fuel Cells
Efficiency of fuel cell = 35%
Energy consumption per week = 250kWh
The efficiency defined is the second law efficiency and not the first law efficiency
Second law efficiency = Energy in kWh/Pressure in kPa
Hydrogen cylinders Type K are used (196L @ 2000PSIG)
Now 2000 PSIG = 6894.757*2000 Pa
= 13789514 Pa = 13.789 kPa
Let number of cylinders be N
Total pressure = 13.789N
So,
0.35 = 250/13.789N
N = 51.8 = 52
So, 52 cylinders are required
Flywheels
Between ca
on fiber and aluminum,...
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