If I put a Peltier device between a heat source and a heat sink (Peltier turned off), How well will it conduct heat? as opposed to lets say a copper block?
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Most thermometric cooling modules (Peltier devices) are made out of Bismuth Telluride which has a thermal conductivity of 1.20 W/(m·K), similar to ordinary glass.
From this wiki list of thermal conductivities:
Copper, 401 W/(m·K)
Aluminum, 237 W/(m·K)
So for a given temperature differential, a thermometric cooling module in the off state would conduct 334 times less heat than copper and 197 times less heat than aluminum.