Engine efficiency of thermal engines is the relationship between the total energy contained in the fuel, and the amount of energy used to perform useful work. There are two classifications of thermal engines-
- Internal combustion (gasoline, diesel and gas turbine, i.e., Brayton cycle engines) and
- External combustion engines (steam piston, steam turbine, and the Stirling cycle engine).
Each of these engines has thermal efficiency characteristics that are unique to it.
Other articles related to "efficiency, engine, engine efficiency":
... To calculate the actual efficiency of an engine requires the energy density of the fuel being used ... (LHV) is used for internal combustion engine efficiency calculations because the heat at temperatures below 150 °C (300 °F) cannot be put to use. 18,500 BTU/lb (0.0119531 kW·h/g) Thus a diesel engine's efficiency = 1/(BSFC*0.0119531) and a gasoline engine's efficiency = 1/(BSFC*0.0122225) ...
... Flight altitude affects engine efficiency ... Jet-engine efficiency increases at altitude up to the tropopause, the temperature minimum of the atmosphere at lower temperatures, the Carnot efficiency is higher ... Jet engine efficiency is also increased at high speeds, but above about Mach 0.85 the airframe aerodynamic losses increase faster ...
... The Stirling cycle engine has the highest theoretical efficiency of any thermal engine but it is more expensive to make and is not competitive with other types for normal commercial use ...
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—Aldous Huxley (18941963)