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3.4.4 System hydrogen consumption rate
Figure 3.4.4 presents the fuel consumption rate of the H-1000XP system at different
power outputs. The data is recorded in Nominal operating conditions (please refer
to 3.4.1 for more details)
Please NOTE the fuel consumption will also vary with ambient temperature, since
high ambient temperature will require higher fan power consumption and also it will
affect the fuel cell stack performance,
16
14
12
10
8
6
4
2
0
0
200
Figure 3.4.4 System hydrogen consumption rate
0W
211.5W
0.0L/min
3.59L/min
4.19L/min 6.07L/min
The following formula is used to calculate the system efficiency
Energy content of 1 kg hydrogen
(1000 / 2) x 22.4 L/mol hydrogen generates 33.3kWh energy
1L/min hydrogen generate 178.361W power
Take 211.5W point for example, the hydrogen consump on is 3.59L/min
Therefore this amount of hydrogen could generate 3.59 x 178.361 = 640W power
Then the system efficiency is 211.5 / 640 = 33%
400
600
System Output Power (W)
408W
604.5W
811.8W
8.71L/min
120.1 MJ (LHV) = 33.3 kWh
800
1000
1200
1015W
1091.2W
11.69L/min
15L/min
24
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