Pee power!
Teenage Girls from Africa Invent a Urine-Powered GeneratorEndAllDisease.com
This has been floating around FB lately, and I caught "the bug", so I did the math based on what was being presented. I was as loose as possible with the figures, hoping to give it /any/ chance of being real, but provided I covered all necessary points, it ends up being break-even in a completely perfect environment, if not a net loss of energy. Anyone care to correct or add something? Here's my comment on the page and on FB regarding it: Has anyone actually done the math on this? There isn't enough hydrogen in the water present in 1 liter (volume) of urine to actually make 6kw/h of electricity. Unless they're talking about running at nearly zero load for 6 hours, or we're missing some very large part of the story, there's literally nothing about this that can work. |
I saw something kind of like that on discovery channel where in Indina people were taking apart dead alkaline batteries and sticking the electrodes in cow poop, they got enough power out of 6 or 8 poo cells to charge a cell phone battery.
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They're suggesting it will provide "6 hours of electricity" (their words), which one can only assume means 6kW/h, from one liter of urine. |
Here, I was looking at that too:
http://ecomodder.com/forum/showthrea...tml#post339605 |
Yeah, basically what that article is saying is exactly what I was thinking. It's valid for a waste-stream, but to actually power anything, they're violating the in/out principles.
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You got it!
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There they say that the energy to electrolyze urea is about 1/3 of that required for water. Of course a liter of urine only contains a few grams of urea. -mort |
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Urine is like 97 percent water by volume. Ergo, water would be the best candidate to remove the maximum volume of hydrogen per unit energy invested from that particular medium. Actually leaving the urea in the water lessens the electrolytic load necessary to separate the hydrogen from the oxygen, but it's still completely unrealistic. |
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-m |
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...but do those "energy" equations also account for any BEER, WINE or WHISKEY content too (wink,wink)?
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