作者ycc01 (ycc01)
看板ChemEng
标题[问题] FUEL CELL效率计算
时间Sat Jun 2 13:21:26 2012
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?
以上题目是撷取 Fuel Cell Handbook 第七版 的9-2页 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
想请问额外的问题是 Electrical Efficiency (percent LHV) 是多少?
(assume hydrogen LHV is 0.2418 MJ/mol)
因为我现在对 Electrical Efficiency 的定义有点模糊，
所以自己有两种算法
( 1.0/(9.32*0.2418) ) *100% = 44.4 %
还是另一种
( 1.0/(7.46*0.2418) ) *100% = 55.4 %
还是以上两种都有问题~
感谢回答
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