Advanced Math A bipolar alkaline water electrolyzer stack module comprises 160 electrolytic cells that have an effective cell area of 2 m^2. At nomina

kuCAu

kuCAu

Answered question

2020-11-16

Advanced Math
A bipolar alkaline water electrolyzer stack module comprises 160 electrolytic cells that have an effective cell area of 2m2. At nominal operation, the current density for a single cell of the electrolyzer stack is 0.40 Acm2. The nominal operating temperature of the water electrolyzer stack is 70 C and pressure 1 bar. The voltage over a single electrolytic cell is 1.96 V at nominal load and 1.78 V at 50% of nominal load. The Faraday efficiency of the water electrolyzer stack is 95% at nominal current density, but at 50% of nominal load, the Faraday efficiency decreases to 80%.
(Give your answer to at least three significant digits.)
Calculate the nominal stack voltage:
Answer in V
Calculate the nominal stack current:
Answer in A
Calculate the nominal power on the water electrolyzer stack:
Answer in kW

Answer & Explanation

Sadie Eaton

Sadie Eaton

Skilled2020-11-17Added 104 answers

Step 1
given
nominal cell potential =1.96 V
number of cell =160
current density=0.40Acm2=0.40x×104Am2
cell active area=2m2
Step 2
Explanation
formula for finding
no minal stack voltage=no minal cell potential×number of cells
substitute the values
no minal stack voltage=1.96V×160 no minal stack voltage=313.6V
formula for finding
no minal stack current=current density×cell active area
substitute the values
Step 3
no minal stack current=(0.40×104Am2)×2m2 nominal stack current=8000 A
formula for finding
no minal power on the water stack=no minal voltage×no minal current
substitute the values
no minal power on the wate rstack=313.6V×8000A=2508.8KW

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