Answer:
The efficiency of this fuel cell is 80.69 percent.
Explanation:
From Physics we define the efficiency of the automotive fuel cell (
), dimensionless, as:
(Eq. 1)
Where:
- Maximum power possible from hydrogen flow, measured in kilowatts.
- Output power of the automotive fuel cell, measured in kilowatts.
The maximum power possible from hydrogen flow is:
(Eq. 2)
Where:
- Volume flow rate, measured in cubic meters per second.
- Density of hydrogen, measured in kilograms per cubic meter.
- Heating value of hydrogen, measured in kilojoules per kilogram.
If we know that 
, 
, 
and 
, then the efficiency of this fuel cell is:
(Eq. 1)
(Eq. 2)
The efficiency of this fuel cell is 80.69 percent.
