The 35% is 35% of the theoretical Carnot, not 35% of the potential energy of the fuel. And yes, the rest of the energy is in the exhaust pipe and water jacket although it is almost all heat as unburned hydrocarbons is usually not true any more.
This little measurement twist is why most don't realize that a 35% efficient fuel cell and a 35% internal combustion engine are not the same although I've seen some attempts at using Carnot to diddle fuel cell numbers.
As for Carnot calculate the available work using Charles law. Then you will see Carnot is useless for low temperature engines.
Kirk
Jan Warnqvist <[EMAIL PROTECTED]> wrote:
Jan Warnqvist <[EMAIL PROTECTED]> wrote:
Furthermore,when the energy efficiency of a combustion engine is 35% it means the relationship between added energy (fuel) and the power that comes as a result. The rest of the energy is heat energy, which becomes transported by the cooling system as well as creating hot exhaust fumes. If you could use that heat for some purpose, you will find that almost 100% of the added energy is accounted for.Jan Warnqvist
AGERATEC AB+ 46 554 201 89
+46 70 499 38 45_______________________________________________----- Original Message -----From: Rexis TreeSent: Monday, September 19, 2005 3:05 AMSubject: Re: [Biofuel] Can this man save the world? (Hydrogen injection)"Most internal combustion engines operate at about 35 per cent efficiency. This means that only 35 per cent of the fuel is fully burned. The rest either turns to carbon corroding the engine or goes out the exhaust pipe as greenhouse gases."
Wow, according to this in theory if we make a 100% efficient internal combustion engine then we will have a car with zero greenhouse gases emission and zero carbon corroding to the engine!
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