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Thanks Rowland,
So just to summarise, there is no advantage in having a large conductive surface to the cold side of the TEC, as it would only decrease the efficiency of the module.
Therefore, a copper strip size of a camera base plate (similar to your drawing below) would be sufficient and more effective than a large copper sheet covering the lower half of camera body (which was what I planned).
I will also need a lower current than the one rated on the TEC and a slightly larger fan over the hot surface to increase the efficiency.
Thanks,
Bo
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