I have seen in nearly all configurations that Peltier elements are mounted with huge heat sinks on hot side as compared to tiny ones on small side.
Is this just a way of explaining the need of heat sink on hot side? Or are there any real benefits of smaller heat sink on cold side? Would an element work better(produce lower temperature on cold side) with equally sized heat sinks?
Answer
The Peltier cell generates far more heat on the hot side than it consumes on the cold side; the difference being simply the power you are pumping it with. At a minimum, about 2.5x more, and at large temperature differences, more than that.
The different sizes of heatsink simply compensate for that.
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