How External Combustion Engines Work. An external combustion engine burns fuel externally, or outside the engine. The burning fuel releases thermal energy, which is used to heat water and change it to steam. The pressure of the steam moves a piston back and forth inside a cylinder.
Which is better internal or external combustion engine?
The internal combustion engine has an efficiency of about 35-45 %. As compared to the external combustion engine has an efficiency of about 15-25 %. The Fuel cost of the internal combustion engine is relatively high. As compared to the fuel cost of the external combustion engine is relatively low.
Where are external combustion engines used?
External combustion engine
External combustion engines are no longer used in transportation, as mobile designs are not efficient enough, but they continue to be used in power plants. For example, a natural gas power plant boils water into steam to turn a turbine, creating electricity.
Is Steam Engine an external combustion engine?
A steam engine is a heat engine that performs mechanical work using steam as its working fluid. The steam engine uses the force produced by steam pressure to push a piston back and forth inside a cylinder. … Steam engines are external combustion engines, where the working fluid is separated from the combustion products.
Can we consider heat engine 100% efficient Why Why not?
It is impossible for heat engines to achieve 100% thermal efficiency () according to the Second law of thermodynamics. This is impossible because some waste heat is always produced produced in a heat engine, shown in Figure 1 by the term.
What is meant by SI engine?
A spark-ignition engine (SI engine) is an internal combustion engine, generally a petrol engine, where the combustion process of the air-fuel mixture is ignited by a spark from a spark plug.