ENGINE EFFICIENCY FORMULA

 Engine Efficiency

The thermal energy is combine between the total energy contained in fuel  and this amount of energy perform useful work .

 These are two classified thermal energies

      1) Internal Combustion

      2) External Combustion

These engine has thermal efficiency characteristics that are unique to it

Engine efficiency, transmission design, and tire design all contribute to a vehicle's fuel efficiency.

1) Internal Combustion Engine:-

The first commercially successful internal combustion engine was created by Etienne Lenoir around 1860 and this engine is known as Otto engine and was created in 1876 by Nicolaus Otto .

This term  of engine is usually refer to an engine in which combustion is intermitted, familiar as two stroke and four stroke engine piston engine and have a variant such as six stroke piston engine and Wankel rotary engine. The second class of internal combustion engine use continuous combustion gas turbines, jet engines and rocket engine .

2) External Combustion Engine:-

 An external combustion engine is reciprocating heat engine where a working fluid, contained internally, is heated by combustion in an external source, through the engine wall or a heat exchanger  The fluid then, by expanding and acting on the mechanism of the engine, produces motion and usable work. The fluid is then dumped (open cycle), or cooled, compressed and reused (closed cycle). In these types of engines, the combustion is primarily used as a heat source, and the engine can work equally well with other types of heat sources.