Everything about External Combustion Engines totally explained
An
external combustion engine (EC engine) is a
heat engine where an (internal) working
fluid is heated by combustion of 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 cooled, compressed and reused (closed cycle), or (less commonly) dumped, and cool fluid pulled in (open cycle air engine).
"
Combustion" refers to
burning fuel with an
oxidizer, to supply the heat. Engines of similar (or even identical) configuration and operation may use a supply of heat from other sources such as nuclear, solar, geothermal or exothermic reactions not involving combustion; but are not then strictly classed as external combustion engines.
The working fluid can be a
gas as in a
Stirling engine, or
steam as in a
steam engine. The fluid can be of any composition;
gas is by far the most common, although even single-phase
liquid is sometimes used. In the case of the
steam engine, the fluid changes
phases between liquid and gas.
Further Information
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