In the reading section, the writer contends that Fuel cell engines, engines which produce electricity by using hydrogen, would be an appropriate alternate for internal-combustion engines due to several reasons including renewable resources of Hydrogen, cutting off car pollution, and cost saving; however , in the lecture, the professor casts doubts on the reading points by presenting some reasons and examples.
First of all, the writer claims that fuel-cell engines utilize hydrogen which is a renewable source compare to internal-combustion engines are rely on petroleum, a finite resource; in contrast, the professor rejects this notion by stating that although hydrogen exists tremendously in the environment, it would be so complicated to make it usable for engines, due to the fact that fuel-cell engines consume exclusively hydrogen in the liquid form. producing and storing liquid hydrogen as an artificial product is a hard process for instance providing very cold condition is a necessity of obtaining it from water. Therefore, these engines would not be a practical solutions.
Moreover, contrary to the idea in the reading suggesting that fuel cells are much more environmental friendly by cutting off producing carbon dioxides, by-product of burning oil; the lecturer asserts that on the other hand, purification of hydrogen is an energy-consuming process which apply coal and oil resources. Thus, although fuel cell engines would not polluted air directly, refining hydrogen in factory would.
In addition, even though the writer indicates that due to high performance of fuel cell automobiles, nearly twice, fuel cell cars would be economical, the professor mentions that how fuel cell cars are expensive owing to applying a kind of expensive metal in engine fabrication. a specific metal which does not undergo chemical reaction during electricity generation. the professor clarified several experiments are conducted to replace this metal with a cheaper one, still have no answer.
- ۹۸/۰۱/۲۶