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See Directory:Thermoacoustics

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Other Acoustic Technologies
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A Sound Way to Turn Heat into Electricity - University of Utah physicists developed small devices that turn heat into sound and then into electricity via piezoelectric conversion. The technology holds promise for changing waste heat into electricity, harnessing solar energy and cooling computers and radars. (PESN May 5, 2007)

Directory:Magnetic Resonance Amplifier - Dan Davidson: US Patent # 5568005 ~ Acoustic-Magnetic Power Generator

Los Alamos National Laboratory has developed an "Acoustic Stirling Heat Engine" with no moving parts. It converts heat into intense acoustic power.

Free Energy Blog:2013:11:11 - Two spherical Helmholtz resonators (glass Christmas tree bulb ornaments with a resonance frequency of 386 Hz) connected by a thin rod and suspended from a thread will rotate when driven at their resonance frequency, provided that the driving sound is loud enough (in this case more than 125 dB). (Free Energy Blog November 11, 2013)


Increased Efficiency Losses

On June 17, 2007, NEC advisor, Directory:James Dunn wrote:

To first convert heat to sound and then sound to electrical

energy will not yield over 12-15% efficiency, which is where we are with

peltier and Seebeck devices today.

Heat to sound is not simple or efficient, (20-30%) and sound to electric

(as in piezoelectric or capacitive (electret) microphones) is quite

mature, but not considered of good efficiency (25-35%). Other possible

choices like Barium titanate transducers might be a little better, but

still not dramatic.

To compound 2 low efficiency devices (20-30% each) will not yield over

10% final net efficiency.

This is not likely to beat existing techs.


On June 21, 2007, Congress:Advisor:Kenneth M. Rauen wrote:

I beg to differ. See

The Los Alamos National Laboratory team that

developed the first practical acoustic Stirling engine

now has its efficiency up to 30%. They say linear

motor/generators can be driven by this engine, and

such generators are over 80% efficient. 30% x 80% =

24%. A 90% alternator would make it 27%. These are

much better numbers than James Dunn claims they are.

I say thermoacoustic engines with linear alternators

are more efficient than common thermoelectric

generators. They are about the same in cutting edge

TEG designs which are reported to be about 25%


For those of you who do not know, Peltier and Seebeck

devices are the same thing! They are thermoelectric

devices such as thermocouples, thermopiles, and

thermoelectric generators. The Peltier effect is the

phenomenon of heat-to-electricity and

electricity-to-heat at a thermoelectric junction, such

as a p-n junction in semiconducting materials a solar

cell exhibits the same thing with a particular

wavelength of light. The Seebeck effect is the

voltage of said junction, as a function of

temperature, measured in volts per degree.


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