Forum Discussion
ktmrfs
Jan 15, 2018Explorer III
PopBeavers wrote:
As a former wanna be engineer what I think it ultimately boils down to is energy density.
How much energy is stored in one cubic foot of gasoline?
How much energy is stored in one cubic foot of battery, any type battery of your choice?
This just begs the question: What material(s) have the highest energy density?
it's hard to beat hydrocarbon fuels for useable energy density on either a volume or weight basis. That's even after one realizes that the thermal efficiency of internal or external combustion cycle engines is pretty low. IC gas engines are around 25 percent. Atkins or Miller cycle gas engines are in the high 30's but very poor low rpm torque so they work best in hybrids. Diesel is better than gasoline, but even the most efficent diesel in the world, the big 60 rpm 2 stroke ship engines are under 50 percent close to the theoretical thermal efficiency of a CC engine.
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