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Innovation: A Portable Generator Charges Devices With Fire

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The FlameStower can charge USB-powered devices with fire.

Courtesy of FlameStower

In our blog series, we explore an interesting idea, design or product that you may not have heard of yet. Do you have an innovation to share? .

Hikers and campers can now keep their cameras charged with , which uses heat from a campfire, stove or even candles to charge any device powered by a USB connection. While this can seem superfluous — powering up while getting away from it all — creators Andrew Byrnes and Adam Kell says the device can also bring power to people in developing countries where wireless technology has leapfrogged others, places where people have cellphones but not electricity.

Byrnes and Kell were both studying materials science at Stanford University and at first thought about a generator wired to a toaster, but they quickly dismissed that idea. They spoke to a business school professor, who told them something that’s been their guiding principle since — build something that can cook a pot of rice and charge a cellphone at the same time.

The technology is fairly simple. The FlameStower has a blade that extends out over the fire, while the other end is cooled by a reservoir of water. That means one part of the blade is hotter than the other. The temperature difference generates electricity, and semiconductors amplify the voltage to a useful amount. It gives you the same charge as connecting your phone to a laptop. The Mars Curiosity Rover , though its heat source comes from decaying radioactive materials.

This phenomenon of heat to electricity is called the , and it doesn’t generate a lot of energy, which means it wasn’t that useful until people started walking around with cameras and smartphones.

“Now you have these tools that are insanely powerful, and increasingly are stingy on their energy use, so that value of the low amount of electricity is getting higher,” Byrnes says.

He and Kell want to bring the FlameStower not only to stores in the U.S. but to developing countries as well. Kell recently returned from a trip to rural Kenya and Ethiopia to refine the FlameStower for users there, because around in Africa have cellphones, but have electricity.

“[The cellphone] has been the first technology that people in rural villages are actually buying,” Kell says.

Kell says products sold in developing countries are usually made to be cheaper than their counterparts in the U.S., with the exception of energy, which is much more expensive and less reliable.

Kell and Byrnes aren’t the only people to come up with something like this. The and are both pots that will charge a device and cook your food or boil water at the same time. But Kell says they weren’t as successful in developing countries because people there often want to use their own pots, so the FlameStower founders made something that can work on any stove or fire.

At the moment a FlameStower costs $80, and the project is being until late October.

Alan Yu is a Kroc fellow at NPR.

Source: http://www.npr.org/blogs/alltechconsidered/2013/10/15/234737102/innovation-a-portable-generator-charges-devices-with-fire?utm_content=socialflow&utm_campaign=nprfacebook&utm_source=npr&utm_medium=facebook



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