15-year-old girl invents flashlight powered by the heat of your hand

Re:15-year-old girl invents flashlight powered by the heat o... by pocketstar on Saturday June 29, 2013 @01:38PM (#5963153)

Thanks, No doubt the fan would eat most of the power, thats just another engineering challenge to overcome. There doesnt seem like a better way without making the flashlight huge, then again the scale of power I am used to is an several orders of magnitude greater than what she uses, I probably have a scale bias. Im sure she could design an innovative passive and small heatsink.

Idea: using PCM you could make a flashlight that you recharge in the oven.

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Re:15-year-old girl invents flashlight powered by the heat o... by schiffern on Saturday June 29, 2013 @01:43PM (#5963172)

True, or by leaving it in the sun.

Combining ideas may make sense here. A flashlight with PCM and a black handle that you can leave in the sun, and optionally wrap in a soaked cloth. Perhaps PV makes more sense, but I haven't run the math.

Of course, you'd also want a thermos to carry it in. ;)

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