24
3.4.4 System hydrogen consumption rate
Figure 3.4.4 presents the fuel consumption rate of the H-500XP 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,
The following formula is used to calculate the system efficiency
Figure 3.4.4
Energy content of 1 kg hydrogen
120.1 MJ (LHV) = 33.3 kWh
(1000 / 2) x 22.4 L/mol hydrogen generates 33.3kWh energy
1L/min hydrogen generate 178.393W power
Take 196.27W point for example, the hydrogen consump on is 2.218 L/min
Therefore this amount of hydrogen could generate 2.218 x 178.393 = 395.67
W power
Then the system e
ffi
ciency is 196.27 / 395.67 = 49.6
%
0
2
4
6
8
10
12
14
16
0
200
400
600
800
1000
1200
Av
er
ag
e
Fu
el
C
on
su
m
p
on
(l
/m
in
)
System Output Power (W)
0W
35.34W
78.79W
98.03W
120.2W 149.94W 196.27W 295.72W 397.56W 497.41W
0.108
0.466
0.893
1.108
1.306
1.666
2.218
3.262
4.51
5.69
Summary of Contents for H-500XP
Page 1: ...1 Date 2013 12 16 Item Number H 500XP Version 20131216 Manual H 500XP Fuel Cell System User ...
Page 6: ...6 1 0 SAFETY ...
Page 12: ...12 2 0 PART LIST ...
Page 18: ...18 3 0 GENERAL INFORMATION ...
Page 27: ...27 4 0 SYSTEM SET UP ...
Page 42: ... 42 5 0 SOFTWARE ...
Page 47: ... 47 6 0 MAINTENANCE ...
Page 50: ... 50 7 0 TROUBLESHOOTING ...