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Originally Posted by destroyer125
I just ran across these
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That little guy runs on something called a peltier element. It's a magical little device that runs on DC and transfers heat from one side of its plate to the other (to us laymen, one side gets "cold"). Reverse the polarity and the sides reverse.
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Originally Posted by luminous
I don't think it would be happy in a sulfuric acid solution
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I don't think it would, either.
However, knowing what it is, you can find tons of info on it in search engines. Several companies sell them for all sorts of applications; I don't think it would be very hard to build something that's more suited to anodizing.
The problem with that one is that while I don't doubt that you could get 6-8° out of 10 gallons, the seller doesn't tell you how many days it will take
. I had run across them as CPU coolers in a computer store a few years ago and picked up 3 at $5 apiece. They look exactly like that eBay picture except no spout.
The peltier element can develop a pretty fair temperature differential between its two sides, but you have to take into consideration the size of the element versus the mass that you're trying to heat or cool. I have an "electric cooler" that works on one - I haven't taken it apart to see what size or how many elements are in it. It claims to be able to keep something 40° F cooler inside than the outside temp. It takes it a long time to get cold, though. It runs on 12 volts. If I remember correctly, it was something like $40-60 at WallyWorld about 4 years ago.