Post on 24-Aug-2020
Enjoy Academy, Enjoy Life,
Enjoy Tokyo
张浩 Hao ZHANG Student No.:15R55020
Home institution: Tsinghua University Academic advisor: Takeo Yamaguchi
Chemical Resources Laboratory
08/21/2015
Introduction PEMFC Water transport in PEMFC
Diffusion water
Electro-osmotic water
Generated water
Low humidity: fuel cell IR resistance will be too high. High humidity: flooding in catalyst layer(cathode).
Fuel cell performance will decrease.
Therefore, water management is very important.
0
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0.6
0.8
1
1.2
0 0.1 0.2 0.3 0.4 0.5 0.6
volta
ge(V
)
current density(A/cm2)
IV curve
IR loss
• Cathod:42%RH, 500cc/min • Anode: 15%RH, 100cc/min
experiment result
Numerical Simulation for Water Transport inside the Fuel Cell Membrane
Assumption: • P is related with
RH. • neo is not related
with RH.
00.20.40.60.81
00.20.40.60.8
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0 25 50
rela
tive
hum
idity
the distance from anode/μm
Simulation result of water distribution
My purpose: Prove the simulation result of low humidity condition with experiment method.
Experimental Setup Anode:15%RH H2 100 [mL/min] O2 500 [mL/min]
Cathode:42%RH I observed:
Outlet RH (dew point)
• Check water mass balance
• Compare with simulation result
Confirmation of the Water Mass Balance
generatedcathodeout,anodeout,
cathodein,anodein,
WWWWW
−+=
+
Calculation
The equation of water balance:
Win,anode +Win,cathode
Wout,anode
+Wout,cathode-Wgenerated
Water amount (mol/s) 7.4E-05 7.5E-05
Therefore, water mass balance is achieved. 62.5oC
39.3 oC 59.98 oC
49.4oC
Coincidence Between Experiment and Simulation
water distribution inside membrane
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0.8
1
0 25 50
Rela
tive
hum
idity
the distance from anode(μm) Cathode side
Anode side
• We should consider the relationship between neo and RH.
Conclusion
Experiment value
Simulation value
Current density: 0.54A/cm2
• Low humidity condition will do harm to fuel cell performance.
Simulation assumption: • P is related with RH. • neo is not related with RH.
There is difference of RH in anode side between experiment and simulation result.
Experience in NIPPON!
Shock 7 If you want your grandmother look more fashionable, I recommend you show her how Japanese old ladies dress themselves.
Shock 6 Japanese people have two faces. One face is in office and the other face is in Izakaya(drinking house). They are just crazy.
Experience in NIPPON!
Shock 10 When Japanese students tell you that their English is not good, just believe them. They are not modest, their English is really not so good.
Shock 9 For girls: How to get close to Japanese boys? Ask them if they are interested in watching anime. And you had better know something about lovelive. For boys: How to get close to Japanese girls?
Shock 8 Want to see the ideal Japanese girl in Japan? Just go to maid coffee. Remember take a photo them : )
Experience in NIPPON!
Shock 1 I was prepared to take a holiday in Japan. But the reality is that I stay in lab and classroom all day long except weekends. But it is the most meaningful holiday that I have ever had.
Shock 5 Japanese toilet is really advanced.
Shock 4 When staying in Japan I keep wondering why Japanese streets are so clean? Maybe it’s because there no trash can.
Shock 3 The hanabi show is really terrific. It also shows how rich is Japanese government. And thanks for our scholarship.
Shock2 : what’s the most beautiful place in Tokyo? I think it’s Yokuhama.
Acknowledge Professor Takeo Yamaguchi
Assistant Professor Yuhei Oshiba
Assistant Professor Hidenori Ohashi
MD student Hiroto Okuyama
Professor Hara and all staff for CAMPUS Asia
Thank you & 谢谢!
2015.08.21