[dith]

I should have remembered that heat spreads in a conical fashion. Right now I'm thinking I'll get a 3/8ths inch block, mill out 2/8ths of it into a crosshatched pattern like the one you linked to, and then cap it off with a 1/8th" thick bar so there's 1/8th" of copper in contact with each side of the peltier sandwich.

I'm wondering if the peltier sandwich is the best idea. Perhaps placing my two peltiers side-by-side would work better? That way, I could manufacture one side of the waterblock out of lexan, and the waterblock would be twice as long, doubling the time that the water's in contact with cold copper. Then again, I would have to insulate the side of the waterblock that isn't in contact with the peltiers, which would introduce inefficiency. Perhaps the peltier sandwich with an elongated waterblock really is the best way to go (does anyone have any idea what the optimal length of such a setup would be?)

Thanks for your input ricecrispi!


(sorry to anyone reading this for editing this multiple times, but it seemed like a better idea than cluttering up the thread)