9818247186

9818247186

Table III - Parameters of the 500 W BCS stack

Param.	Value	Param.	Value
n	32	4i	-0.948
T	333 K	42	0.00286+0.0002.1n/t+(4.3.10^J).lnc_H,
A	64 cm²	43	7,6.10"⁵
l	178 pm	44	-1,93.10^J
r«2	1 atm	V	23
Po₂	0.2095 atm	Jmax	469 mA/cm²
B	0,016 V	J„	3 mA/cm²
Rc	0.0003 n	lnax	30 A

Fig. 12 presents a comparison of the stack power between the SR 12 Modular PEM Generator and the BCS 500 W. The rated power for these two stacks are the same, but the curves presented in Fig. 12 show that for a certain current value the correspondent SR 12 stack power is greater than that BCS 500 stack power. This mean that for the SR 12 it is possible to obtain morę power than the rated one, as stated in Section V and used to obtain the model for this stack

0 5 10 15 20 25 30 35

Current (A)

—*— Avista SR 12 —BCS 500W

1000 I 750 | 500

55 250

0

Fig. 12 - Comparison between the power of the Avista SR 12 and of the 500 W BCS stacks VII. CONCLUSION

In this paper most of the parameters used in PEM fuel cells were taking into account to obtain their realistic dynamie model. The model discussed in this paper was used to conduct a performance analysis of PEMFC stacks in similar conditions as those commonly encountered in smali size energy

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