cans of pop? hmm nah i'm not going to try to solder alu, way too much work! thin copper plate or a few layers of copper wire would be better i think... i could always try this (read: if i have the time)
How large would it have to be in order to be a bit efficient? any ideas? And would serial or parallel be better (water going through a S like thing, or water being split over a few tubes)? My vote goes for parallel.
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