To: Wonder Warthog
Even if you derive the hydrogen from oil or natural gas, the increased efficiency of the total fuel cell-electricity-electric motor-mechanical energy combination cycle is still sufficiently more efficient than the thermal engine-mechanical motion (gasoline or diesel)cycle to make it cost effective.
Show me some numbers; the fuel cell is still an exothermic reaction, AFAIK.
To: Old Professer
"Show me some numbers; the fuel cell is still an exothermic reaction, AFAIK"
Sure, but the conversion cycle is not a thermal cycle. That is the difference. ALL energy cycles end up as heat (exothermic). Combustion conversion cycles such as gasoline and diesel engines are limited by the Carnot cycle--direct conversion electrochemical cycles are not so limited, and can approach 100% conversion efficiency.
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