Issue 15

N. Zuli

ani, Frattura ed

Integrità Struttu

rale, 15 (2011)

29-34; DOI: 10

.3221/IGF-ESIS.1

5.04

filter, 2-air com ssure regulator IO 9004 rea analog input l output for t t modules. S

Figure 3 : Sche ge, 6-valve, 7 e CompactR figured with ut, analog ou ng a NI cRIO gema Therm

matic represen solenoid valve IO hardware modules de tput for mas 9201 and N ovison 570 in

tation of the t , 8-hydrogen c , consisting dicated to sp s flow contro I cRIO 920 frared came

est bed (1-air ylinder, 9-pre of the NI cR ecific tasks: ls and digita 6 analog inpu ra.

pressor, 3-flo , 10-nitrogen l time contr for voltage emperature c tack tempera

wmeter, 4-pre cylinder, 11-th oller and the and current ontrol. Singl ture distribu

ssure transmit ermocouple, 1 NI cRIO 9 measurement e cell voltage tion has been

ter, 5- pressur 2-electronic lo 104 chassis, s, thermocou s were measu measured u e

gau

ad).

Th con inp usi a A

was ple red sing

E X

PERIMENT

AL PROCED

URE

(O con cur typ unt Tem infr A

start u degrada °C usin

p and shutd tion. During g an externa ed with nitro an on/off a ected operat forming refo stack cell v stribution wa was pointing

own proced the start-up l hot air blow gen, on both lgorithm. Th ing the stack rmate: H 2 56 oltage reach s observed o the top side

ure were im procedure th er. During t anode and c e control sys at 160°C wit .35%, CO 0. about 0.3 V perating the of the stack.

plemented in e fuel cell sta he shut-down athode sides tem acted on h two differe 5%, CO 2 43. . Single cel stack with pu

order to a ck is heated procedure, . At normal o the hot air nt fuels: pur 15 %. Stack ls voltages w re hydrogen

void water c up from roo the stack wa peration, the blower or on e hydrogen a voltage was ere measure at 400 mA/

ondensation m temperatu s set in Open stack mean the cooling nd a gas mix measured sta d at 200 an cm 2 current d

and membr re to at least Circuit Vol temperature fan. Polariza ture simulatin rting from O d 400 mA/c ensity load.

ane 120 tage was tion g a CV m 2 . The

CV) and purg trolled, using ves were coll ical steam re il the lowest perature di ared camera

40

0

1,0

Single fuel

cell - voltage

25 cells sta

ck - mean cell voltage

35

0

0,9

cell - power density

Single fuel

25 cells sta

ck - mean cell voltage

30

0

0,8

25

0

0,7

[mW/cm 2 ]

20

0

[V]

0,6

15

0

0,5

10

0

0,4

50

0,3

0

400 [mA/cm 2 ]

600

800

0

200

Figure 4 :

Polarization c

urves and pow Stack a

er density var nd single cell

iations with lo mean tempera

ad for the 25 ture: 160°C. F

cells stack and uel: H 2 .

for a single fu

el cell [8].

31