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Originally Posted by dean.collins
... compares with the Zalman reserator at 2.5 liters.
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I don't know anything much about reserators - but I'd suggest thinking about surface area - or finned area, although that gets a bit more complex. Slow moving air may not even move into the areas between fins if they're too close together.
Then there's the whole issue of laminar air flow - slow moving air will "stick" to a surface as it moves alongside it - so you end up transferring heat to the same thin layer of air as it rises up alongside your tank-erator - so the heat differential (and heat transfer efficiency) becomes less as you go upwards.
I keep thinking that one common thing built for passive heat transfer (all-be-it at a 30C heat differential) is the pipe-and-fin stuff that goes into hot water heat registers. Too bad the fins aren't vertical...
On the other hand, you could use a couple of really big heater cores (or a car radiator, even) and a couple of very quiet fans...