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Hydrogen Production (ml/min) 600 500 400 300 200 100 Hydrogen Production (ml/min) Measured Hydrogen Production and Stack Temperature vs. Time (01.05.2007) 0 20 08:00:00 12:00:00 16:00:00 20:00:00 800 700 600 500 400 300 200 100 Hydrogen Production Stack Temperature Time Figure A9 Measured Hydrogen Production and Stack Temperature vs. Time (14.05.2007) 0 20 08:00:00 12:00:00 16:00:00 20:00:00 Hydrogen Production Stack Temperature Time Figure A10 60 55 50 45 40 35 30 25 55 50 45 40 35 30 25 Stack Temperature o C Stack Temperature o C 76
APPENDIX B MASS BALANCE OF A FIVE CELL ELECTROLYZER STACK The mass balance of a 5 cell electrolysis stack and its auxiliary equipments at steady state is shown here. Flow diagram of the system was given in Figure B1. Figure B.1. Stream Numbers of the System Current, voltage, temperature and streams 1, 4, 5, 6 were the measured parameters. Measured streams and their units were given in the table below. Table B.1. Measured Stream Units Stream No Stream Name Unit 1 Electrolyzer water inlet (gr/min) 4 Graduated cylinder oxygen output (15ml/sec) 5 Gas-Liquid separator hydrogen output (ml/min) 6 Gas-Liquid separator water output (gr/5min) Peristaltic pump on stream 1 was set to 10.01gr/min water at the beginning and did not change through the test. Current was set to 6Amp and it was monitored continuously. 77
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HYDROGEN PRODUCTION FROM WATER USIN
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ACKNOWLEDGEMENTS This study was car
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ÖZET GÜNEŞ PĐLLERĐ ĐLE ÇALI
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4.2. Results on a Single Cell PEM E
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Figure 4.16. Hydrogen Production an
Page 11 and 12:
CHAPTER 1 INTRODUCTION World energy
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Table 1.1. Turkey`s energy usage as
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atmosphere according to their hydro
Page 17 and 18:
The reaction goes through two half
Page 19 and 20:
2.1. Hydrogen Production Methods CH
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2.2. Electrolyzers Figure 2.1. Vari
Page 23 and 24:
electrode design are being sought t
Page 25 and 26:
1 285,830J/mol + H 2O(l) → H 2(g)
Page 27 and 28:
another optimization should be done
Page 29 and 30:
Figure 2.3. Molecular Formula of Na
Page 31 and 32:
hydrophobic substances in electrode
Page 33 and 34:
Different than Grigoriev’s work,
Page 35 and 36: voltages. This concept is also vali
Page 37 and 38: Interdigitated flow field is a diff
Page 39 and 40: generator is always working at its
Page 41 and 42: ecord the voltage and the current s
Page 43 and 44: Figure 3.2. Anode side of the elect
Page 45 and 46: 6. Cover the cathode GDL with 1mm t
Page 47 and 48: to deliver water. The front side of
Page 49 and 50: 5. Place the cathode side GDL into
Page 51 and 52: electrolyzer to monitor the potenti
Page 53 and 54: Figure 4.1. “X” type flow field
Page 55 and 56: MEA, there were no electrolysis on
Page 57 and 58: In fact, it was observed on the dis
Page 59 and 60: In each run, current density was in
Page 61 and 62: Voltage 2,25 2,20 2,15 2,10 2,05 2,
Page 63 and 64: Therefore, for the current cell des
Page 65 and 66: 8Amp, respectively. The calculated
Page 67 and 68: At 500mAmp/cm 2 , the potential dif
Page 69 and 70: The installed system had 6 of this
Page 71 and 72: At 11.00 AM, as the current density
Page 73 and 74: Figure 4.19 shows solar radiance da
Page 75 and 76: On Iztech campus, the system constr
Page 77 and 78: voltage temperature trend observed
Page 79 and 80: REFERENCES Grigoriev S.A.,Porembsky
Page 81 and 82: British Petrol World Statistical Re
Page 83 and 84: Hydrogen Production (ml/min) Hydrog
Page 85: Hydrogen Production (ml/min) Hydrog
Page 89 and 90: Table B.3. Mass Balance of Species
Page 91 and 92: Stream3; Species stream 3 at 314.6K
Page 93 and 94: Figure B.3. Input and output stream
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