Monday, November 26, 2007

Blow me... to make electricity I mean :}

How to do it: here.

Most of the heat-to-electricity acoustic devices built in Symko's laboratory are housed in cylinder-shaped "resonators" that fit in the palm of your hand.

... with matches, a blowtorch or a heating element -- the heat builds to a threshold. Then the hot, moving air produces sound at a single frequency, similar to air blown into a flute.

"You have heat, which is so disorderly and chaotic, and all of a sudden you have sound coming out at one frequency," Symko says.


Similar ideas can also be applied to refrigeration:
Tabletop thermoacoustic refrigerator for demonstrations

An inexpensive (less than $25) tabletop thermoacoustic refrigerator for demonstration purposes was built from a boxed loudspeaker. ...

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