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The most efficient thermoacoustic devices have an efficiency approaching 40% of the Carnot limit, or about 20% to 30% overall (depending on the heat engine temperatures). [11] Higher hot-end temperatures may be possible with thermoacoustic devices because they have no moving parts, thus allowing the Carnot efficiency to be higher. This may ...
A thermoacoustic engine operates using the effects that arise from the resonance of a standing-wave in a gas. A standing-wave thermoacoustic engine typically has a thermoacoustic element called the "stack". A stack is a solid component with pores that allow the operating gas fluid to oscillate while in contact with the solid walls.
A diagram of a simple thermophone, from a 1917 Bell Labs paper. A thermophone is a type of transducer that converts an electrical signal into heat, which then becomes sound.It can be thought of as a type of loudspeaker that uses heat fluctuations to produce sound, instead of mechanical vibration.
1962 – Nikolaus Rott reopened the topic.of thermoacoustic engines described by Lord Rayleigh in 1887 and produced a full theoretical analysis which led to technological development and a working device carried on the Space Shuttle in 1992. 1992 – The first practical magnetohydrodynamic generators are built in Serbia and the USA.
Thermoelectric generators are primarily used as remote and off-grid power generators for unmanned sites. They are the most reliable power generator in such situations as they do not have moving parts (thus virtually maintenance-free), work day and night, perform under all weather conditions and can work without battery backup.
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