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From: Winfield Hill
Subject: Re: HELP WITH INDUCTION SETUP
Date: 17 Nov 2002 14:11:17 -0800
Organization: Rowland Institute
References: <3DD40746.4C3B0E33@xympatico.ca> <3DD5B234.ACC7FB27@xympatico.ca>
X-Newsreader: Direct Read News 4.10
Gene De Guzman wrote...
> I wanted to use the principle of induction (step-down) for
> electrolysis of water. I had this idea ... [snip bad idea]
Remember that water electrolysis takes at least 1.23V across the
electrodes in the water. Much more if you don't have a highly
conducting solution, such as by adding Sulfuric Acid, etc.
This site, http://www.eren.doe.gov/hydrogen/faqs.html says that
commercial electrolysis systems operating at a current density
of about 1 A/cm2 require at least 1.75 volts.
If you want a current of 550 amps, you'd need an electrode area
of 550 cm^2, which is about 9 x 9 inches. But I imagine it'd be
quite a beast, dissipating 550A * (1.75-1.23)V = 286 watts heat,
plus more for the connections and wiring. Surely it would also
create enough hydrogen to be rather dangerous. Be careful!
If your power source was a bank of 12V batteries, you could gain
some benefit from a voltage step-down system. Let's assume your
wiring resistance drop consumed another 1.5V, you'd need a 2.75V
550A converter. That would be a 1500-watt 2.8V power system, and
it would be a very impressive beast indeed.
Given the difficulty of doing everything with optimum efficiency
until you learn more, I'd suggest concentrating on working toward
a 500A 5V system. You can buy inexpensive surplus 100 and 200A
5V power supplies for under $100. These run off 120 or 240vac,
and a 2500-watt setup of these old beasts should have their own
dedicated electrician-installed ac outlet bank, similar to your
electric range. Maybe you could scale back to 100A and learn the
ropes with a single power supply. Here are a few I found for under
$60 using Google.
Or you could look a little harder for some 5V 200A models; I got
some a while back at a good price.
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