The pipe/s would need to be covered with chux or similar to mantain an even flow down the sides (and prevent water noise)
I'm not sure if that amount of surface area would provide sufficient cooling in still air, some low speed forced air may still be needed, it's something that would need to be tested.
The height shouldn't be an issue, it makes no difference to the pump if it pushing up a 1'' dia column of water or a 1' dia column, only the vertical height matters and 2' isn't a problem for any pump that is suitable for pc water cooling.
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feel free to icq/msn me, I'm always willing to toss around ideas.
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