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Future wearables could use body heat for power

Repurposing wasted energy from body heat
on April 30, 2021, 15:46
7 comments
Why it matters: Researchers in China have developed a thermoelectric generator (TEG) that could one day replace batteries in wearable devices like fitness trackers, smartwatches and pulse sensors. More work is needed to make it commercially viable but with wearables becoming increasingly popular, it certainly seems worth exploring.
Their prototype TEG measures 4.5 inches long by 1.1 inches wide. When wrapped around the wrist of a test subject, the device was able to leverage the difference in temperature between the wearer’s skin and the ambient environment to power an LED.
Unlike other generators that use motion to produce power, TEGs have no moving parts, so they require very little maintenance. Qian Zhang of the Harbin Institute of Technology and her colleagues modified their prototype to be more flexible and in testing, it was able to survive ....

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Small generator captures heat given off by skin to power wearable devices

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VIDEO: This video shows the flexible TEG wristband converts heat emitted by skin into electric power and light up an LED.
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Credit: Yijie Liu
Scientists in China have developed a small, flexible device that can convert heat emitted from human skin to electrical power. In their research, presented April 29 in the journal
Cell Reports Physical Science, the team showed that the device could power an LED light in real time when worn on a wristband. The findings suggest that body temperature could someday power wearable electronics such as fitness trackers.
The device is a thermoelectric generator (TEG) that uses temperature gradients to generate power. In this design, researchers use the difference between the warmer body temperature and the relatively cooler ambient environment to generate power. ....

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Wristband that turns body heat into electricity can power an LED

Alena Butusava/Getty Images
A wearable wristband containing a thermoelectric generator (TEG) can convert body heat into enough electricity to power an LED. In future, the technology may be able to power smartwatches and end the need for traditional charging hardware.
“Energy supply is always a big issue, and this could help alleviate the energy crisis,” says Qian Zhang of the Harbin Institute of Technology, China, one of the co-authors of the paper, who has worked on TEGs for more than 15 years.
TEGs are used in a wide range of applications, but are often rigid – something Zhang and her colleagues sought to solve. They layered a magnesium and bismuth material – the TEG materials – between polyurethane and a flexible electrode, enabling the wristband to wrap around a human arm. ....

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Od HIV ke covidu: mutace způsobují extrémní náchylnost i výjimečnou odolnost
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Where does Iowa fit on the energy grid system?

Where does Iowa fit on the energy grid system?
Thursday, February 18, 2021 3:02 PM
This week, both Iowa and Texas faced below-freezing temperatures as residents bundled up indoors. The difference? As winter storms rolled in, more than 3 million Texas customers were hit with power blackouts as the Electric Reliability Council of Texas (ERCOT), the nation’s only single-state electric grid operator, failed to meet surging demand.
Iowans have experienced widespread power failure before, but the state’s ties to the Eastern Interconnection energy grid one of three U.S. grids, including the Western Interconnection and ERCOT gives Iowa a broader geographic diversity of resources, as well as diversity of energy production. It’s not a guarantee of protection from widespread events, said Jim McCalley, Anson Marston Distinguished Professor in the Department of Electrical and Computer Engineering at Iowa State University. ....

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