The coil, filled with cold as f*ck bong water, should be colder than the air blowing out, if my estimation is correct. This will cause condensation. Coil that puppy from the top to the bottom in 1/2" copper tubing (in at top, out at bottom), and pump bong water through it to catch condensation.
The only thing that this assumes is that when steam goes from a high energy state to a low state (condensate), where does the energy go? Does it go to the surface it condensed on, or does it heat the air itself? If it goes to the surface, then this wouldn't work, as it would fit into the "perpetual motion" paradox. Otherwise, I predict the air will be warmer leaving and more condensation will be collected.
If this doesn't work, Ben's suggestion about the Pelt cooler can be done, as long as there are pinholes at the low points for water drainage.
A dehumidifier still remains an option, though, on an exhaust outlet from the bong. We'd let the condensation from the dehumidifier (significant) drain into a standard radiator style cooling loop repeatedly for every bit flowing back to fill the bong (on an overflow system like ben suggested, possibly). Using a dehumidifier like this would prevent massive condensation, be acceptable in case of failure (worst case is that you lose your coolant and have to fill up, but mtbf would be a day or more giving you a chance to react if you're not there), and would be very efficient. Using one, you could eliminate the hot tower in place of a long duct to the dehumidifier, and then using the hot res, a rad, and a pump as a secondary cooler (I imagine the water from the DH would be warm, and we don't want that in our bong!).
Plus, using a dehumidifier on your bong is 1337, d00dz!
Whatcha think?
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#!/bin/sh {who;} {last;} {pause;} {grep;} {touch;} {unzip;} mount /dev/girl -t {wet;} {fsck;} {fsck;} {fsck;} {fsck;} echo yes yes yes {yes;} umount {/dev/girl;zip;} rm -rf {wet.spot;} {sleep;} finger: permission denied
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