Low Power Thermoelectric Generator Runs on Body Heat
January 16th, 2013Via: Fast Company:
It’s no science-fiction fantasy. With wearable gadgets like Google’s Project Glass on the horizon, all that’s missing is an ultraportable power source that never needs recharging–like, say, your own body heat. A startup in Corvallis, Oregon, has developed a small chip that can turn body heat into electric energy, using the same technology found in solar panels. “We absorb the heat from your body, and that heat is funneled through a thermoelectric generator that converts it into electric power,” says Perpetua Power Vice President Jerry Wiant. The result: a single, square-inch TEGwear chip generates enough power (up to 3 volts) to power anything from the accelerometer in your pedometer to the wireless headset for your smartphone.
The physics behind TEGwear is basic: Your body is always generating heat, even when you are asleep. And heat, regardless of the source, excites electrons. The flow of electrons, in turn, generates electricity. The tricky part is harnessing enough electricity to power a small device. Wiant says TEGwear will do just that, as long as the chip is either touching your skin or separated from it by only a thin layer of clothing.
I can’t be the only one reminded of the Matrix, right?
I was looking around to see if I could extract meaningful amounts of power from the nearby TV transmitter (answer: virtually nothing) and I found this report on extracting power from ambient sources, targeted at military use in the field: http://www.pnl.gov/main/publications/external/technical_reports/PNNL-13336.pdf
Worth a read if you’re interested in “free” energy – although some of the methods should be termed “stolen energy” (inductively coupling to high-voltage transmission lines).