I'm trying to build a 4oz res/airtrap, because I hate a cluttered sys and I have no room. But, I think the arangement of the water contributes to the cooling in a res, such as how much exposed surface area the water has. Having a tall cylinder with only a tiny circle's worth of water exposed to air at the top would probably cool worse than a tub (unless the cylinder was all metal with fins, lol). It would be rather funny taking a full 20gallon tub to a LAN now wouldn't it?
<edit> To Aristotle's latest question, a larger res with more water should have a larger heat capacity, and won't react as fast both heating up and cooling down. So a smaller amount of water will cool down faster, but also heat up faster. </edit>
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