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To those that are interested have now stacked two Peltiers and I am getting a 30C+ drop in temperature! It is not all that simple as the second Peltier has to cope with the heat that is generated as well as the heat pumped by the first. So as usual we have the law of diminishing returns rearing its ugly head. I used a Peltier that has twice the heat pumping capacity of the first so they could both be electrically connected in parallel. This keeps the DC power requirements simple.
Putting polystyrene expanding foam around all the cool bits helps also.
Bert
Last edited by avandonk; 09-02-2008 at 03:50 PM.
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