Tuesday, 12 July 2016

thermodynamics - Is it more efficient to stack two Peltier modules or to set them side by side?



Is it more efficient to stack two Peltier modules or to set them side by side? And why?


I have a small box that I want to cool down about 20 K below ambient -- cold, but not below freezing. (I want to keep my camera cool, so I'm putting in this cool box. The camera looks through a flat glass window on one side of the box).


The heatsink I have on hand is about twice as wide as the widest Peltier module I originally planned on using. So there's room to put 2 Peltier modules side-by-side under the heatsink. Or I could center a stack of 2 Peltier modules under the heatsink. Which arrangement is more efficient?


I have to cut a bigger hole in the insulation for the side-by-side arrangement, so the unwanted heat that "back-flows" through the side-by-side arrangement is worse. On the other hand, other effects are worse for the stacked arrangement.


(Is https://electronics.stackexchange.com/ a better place to post questions about Peltier coolers?)




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