In practical application, however, the overall efficiency of PEMFC can’t be optimistic, for the electric efficiency of PEMFC is affected by many operational parameters, which result in lower electric efficiency, and besides, waste heat produced in PEMFC accounts for 40%~60% of the whole energy, but the heat is in low grade, so it is difficult to be used.
然而,在实际应用中,质子交换膜燃料电池的燃料综合利用率并不高,其主要原因为质子交换膜燃料电池输出电效率受到各种操作条件的影响,降低了电池堆的电效率,同时质子交换膜燃料电池在发电的过程中产生热,这部分余热占总能量的40%~60%,但由于余热的品位低,利用困难,因而降低了燃料的利用率。
参考来源 - PEMFC堆电效率与PEMFC·2,447,543篇论文数据，部分数据来源于NoteExpress
Other tasks under the contract include improvement of electric motor efficiency, integration of solar cells into aircraft wings, and the exploration of hydrogen storage technologies.
合同框架下的其他任务包括，改善电力马达效率、在机翼上集成太阳能电池并探索氢存储技术。
It would vastly improve the reliability, availability and efficiency of the electric system.
这样的电网会极大的提高电力系统的可靠性，可用性，以及效率。
There is a great deal of disagreement as to the efficiency of electric cars.
目前，关于电动汽车的效率还存在很大的争议。
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