A team of doctoral students led by University of Utah physicist Orest Symko have constructed a device that "converts heat into sound and then into electricity." They believe it could work as an alternative to photovoltaic cells and be in production in two years.
The project was funded by the US military as a way to harness the waste heat produced by radar systems and power electronics in the field.
When heat is applied -- 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.
Link (Via Complexity Digest)
"You have heat, which is so disorderly and chaotic, and all of a sudden you have sound coming out at one frequency," Symko says.
Then the sound waves squeeze the piezoelectric device, producing an electrical voltage. Symko says it's similar to what happens if you hit a nerve in your elbow, producing a painful electrical nerve impulse.
Longer resonator cylinders produce lower tones, while shorter tubes produce higher-pitched tones.
Devices that convert heat to sound and then to electricity lack moving parts, so such devices will require little maintenance and last a long time. They do not need to be built as precisely as, say, pistons in an engine, which loses efficiency as the pistons wear.
I asked Amy Parness, the co-founder of Sparkle Labs, maker of fantastic educational electronics kits, to write a Medium post about gender and the business of being a maker business person. Her terrific essay calls out the problems with “pink girly engineering kits.” From Medium:
Zero UI is the new term for “invisible interfaces”—what happens in the future when all the clicking and tapping and typing is history: “If you look at the history of computing, starting with the jacquard loom in 1801, humans have always had to interact with machines in a really abstract, complex way.” [Fast Company]
CEO Dick Costolo will resign, to be replaced in the interim by Jack Dorsey
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