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Originally Posted by Shoebox9
PS Comments on my condensation attractor idea are very welcome. :-) I figure inside an air sealed system (with an external cooling radiator) a limited amount of water vapor exists which will be "attracted" to condense on the coldest thing, thus reducing available water held by this packet of air to condense on other bits. Am I mad, will this work?
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I think the issue is your "attract" is in quotes for good reason, there is no attraction of water vapor, just an increased local probability of condensation at your "attractor". In the strictest sense it will reduce the amount of water vapor available to condense elsewhere because the system is closed (materially, but impossible to do thermodynamically, best you can do is buffer), but does not reduce the probability of condensation elsewhere.
You could get your own little weather system going in that case. Unfortunately it would be a mild one, so no use having a case window to display "a cloud in a box". Even if you accumulate a lot of ice at the "attractor" with the energy inputs into the case there will be sublimation and redistribution as everything tends towards entropy.