"External combustion" redirects here. For the album, see External Combustion.
An external combustion engine (EC engine) is a reciprocatingheat 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.[1] 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.
Model Stirling engine, with external heat from a spirit lamp (bottom right) applied to the outside of the glass displacer cylinder.Newcomen's engine, a precursor of the steam engine, with the boiler heated from beneathSectioned steam locomotive. Although the fire is within an enclosed firebox, this is still an external combustion engine, as the exhaust gas and the steam working fluid are kept separate.
"Combustion" refers to burningfuel 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; they are not then strictly classed as external combustion engines, but as external thermal engines.
Working fluidedit
The working fluid can be of any composition and the system may be single-phase (liquid only or gas only) or dual-phase (liquid/gas).
Dual-phase external combustion engines use a phase transition to convert temperature to usable work, for example from liquid to (generally much larger) gas. This type of engine follows variants of the Rankine cycle. Steam engines are a common example of dual-phase engines. Another example is engines that use the Organic Rankine cycle.
Naptha engine, a variant of the steam engine, using a petroleum liquid as both fuel and working fluid.
Referencesedit
^external combustion - Definition from the Merriam-Webster Online Dictionary
January 01, 1970
external, combustion, engine, external, combustion, redirects, here, album, external, combustion, external, combustion, engine, engine, reciprocating, heat, engine, where, working, fluid, contained, internally, heated, combustion, external, source, through, en. External combustion redirects here For the album see External Combustion An external combustion engine EC engine is a 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 1 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 Model Stirling engine with external heat from a spirit lamp bottom right applied to the outside of the glass displacer cylinder Newcomen s engine a precursor of the steam engine with the boiler heated from beneath Sectioned steam locomotive Although the fire is within an enclosed firebox this is still an external combustion engine as the exhaust gas and the steam working fluid are kept separate Contents 1 Combustion 2 Working fluid 2 1 Single phase 2 2 Dual phase 3 See also 4 ReferencesCombustion edit 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 they are not then strictly classed as external combustion engines but as external thermal engines Working fluid editThe working fluid can be of any composition and the system may be single phase liquid only or gas only or dual phase liquid gas Single phase edit Gas is used in a Stirling engine Single phase liquid may sometimes be used clarification needed Dual phase edit Dual phase external combustion engines use a phase transition to convert temperature to usable work for example from liquid to generally much larger gas This type of engine follows variants of the Rankine cycle Steam engines are a common example of dual phase engines Another example is engines that use the Organic Rankine cycle See also editOrganic Rankine cycle Steam engines Stirling engines Trochilic engine Internal combustion engine ICE Nuclear power Solar thermal rocket an externally heated rocket Naptha engine a variant of the steam engine using a petroleum liquid as both fuel and working fluid References edit external combustion Definition from the Merriam Webster Online Dictionary Retrieved from https en wikipedia org w index php title External combustion engine amp oldid 1204976296, wikipedia, wiki, book, books, library,
