I've seen alot of 'table-top' refridgerators and coolers thats use TECS. If you looked some up online you may be able to get the electical specs online. If so you could estimate the size of the TEC they use.
I'm not sure what you meant by aluminum box. If its sheet aluminum then it probobly won't be siffecient to cool the TEC. However if you used 1/4in for the whole box, or just one side it should be enough to distrubte the cold.
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