[Electric Boats] Engine thermal efficiency

 

Thanks Denny,

This is more data that supports what I was saying. 12hp-h or 9kWh from 33kWh of fuel calculates to 27.2% thermal efficiency.

Eric

--- In electricboats@yahoogroups.com, "dennis wolfe" <dwolfe@...> wrote:
>
> Per wikipedia http://en.wikipedia.org/wiki/Brake_specific_fuel_consumption a modern 4 stroke gasoline engine produces one hp-hour with 0.5 lbs. fuel. That means a gallon of gas (@ 6lb/gal) can produce 12 hp-hr or 16 kWh. Most of the energy in the gas is converted to heat in the engine, not useful work.
>
> What is unsaid is that an electric system is around 90% efficient over a wide range of speed while an ICE is quite a bit less efficient running at low load.
>
> Denny

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