Which is the most efficient engine and why?

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Offline Tintin_Triton

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Which is the most efficient engine and why?
« on: 30/09/2009 09:11:33 »
Well, I have heard about many engines, but my question is which is the most efficient? And if it is then why?
"A Gem is not polished without friction, nor man perfected without trials"
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Offline peppercorn

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Which is the most efficient engine and why?
« Reply #1 on: 30/09/2009 12:08:40 »
The frustrating answer is 'it depends'.

No one type of engine (I'll assume you mean heat engine) is most efficient under all loads or speeds. Also realisable efficiency is also a question of what 'fuel' you have available.

If you want to pick a specific well-defined application for your engine, someone might have a more illuminating answer for you.

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Offline lightarrow

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Which is the most efficient engine and why?
« Reply #2 on: 02/10/2009 18:33:08 »
Well, I have heard about many engines, but my question is which is the most efficient? And if it is then why?

It is an engine working with a Carnot cycle: two isotherms and two adiabatics. The reason lies in thermodynamic theory; it's demonstrated that every other cycle has a lower efficience.
http://en.wikipedia.org/wiki/Carnot_heat_engine
http://en.wikipedia.org/wiki/Heat_Engine#Efficiency
« Last Edit: 02/10/2009 18:35:26 by lightarrow »