A 1.0 MW fuel cell stack is operated with a cell voltage of 700 mV
on pure hydrogen with afuel utilization, Uf of 80 percent.
(a) How much hydrogen will be consumed in lb/hr? (b) What
is the required fuel flow rate?
以上題目是擷取 Fuel Cell Handbook 第七版 的9-2頁 Example 9-2 部分
其中 (a)的答案是 118.4 lb/hr = 7.46 mol/sec
(b)的答案是 148.0 lb/hr = 9.32 mol/sec
想請問額外的問題是 Electrical Efficiency (percent LHV) 是多少?
(assume hydrogen LHV is 0.2418 MJ/mol)
因為我現在對 Electrical Efficiency 的定義有點模糊，
所以自己有兩種算法
( 1.0/(9.32*0.2418) ) *100% = 44.4 %
還是另一種
( 1.0/(7.46*0.2418) ) *100% = 55.4 %
還是以上兩種都有問題~
感謝回答
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