Are Fuel Cells Really That Efficient? EVWORLD COM

10 Фев 2015 | Author: | No comments yet »
Mercedes Benz F 500

Are Fuel Cells Really Efficient?

Ulf Bossel is at it again as he a critical look at the real efficiency of hydrogen fuel vehicles.

We are told that one of the advantages of fuel cell-powered is their greater efficiency. a conventional gasoline internal engine has a maximum Carnot of less than 25%, a cell engine has a potential better than 30% and possibly But could these calculations be on an incorrect analysis, sort of the proverbial apples to oranges?

Dr. Ulf Bossel believes so and in his recently-published technical paper entitled, of Hydrogen Fuel Cell, and Battery Electric Vehicles. he out to prove his case by first a closer look at the amount of it takes to make hydrogen. He that in order to compare the efficiency of hydrogen compared to energy carrier options, a synthetic diesel fuel scientists need to base calculations on the Higher Heating or HHV of all energy carriers. The use of the hydrogen’s Heating Value, he writes, the laws of physics.


The widespread use of the Lower Heating LHV may be a convenient convention, but it is not supported by Bossel contents.In fact, the use of the Heating Value for hydrogen by electrolysis (and other violates the energy conservation

By the Swiss-based scientist’s calculation, a PEM cell typically used in fuel cell cars is, at 22% efficient if the hydrogen is compressed and 17%, if its liquified. By contrast, a diesel hybrid similar to the new F-500 concept vehicle above has a well-to-wheel efficiency of And when he looks at the efficiency of electric cars, he comes up a power plant-to-wheel efficiency of 66% regenerative braking is included.

Mercedes Benz F 500

From his perspective, battery cars make the most for local commuting, while hybrid-electric drives make the sense for the family vehicle if energy efficiency and cutting gas emissions are the two top priorities.

He concludes, Statements claiming fuel cell vehicles to be the or the best solutions for the future applications certainly need validation.

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Mercedes Benz F 500
Mercedes Benz F 500

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