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the cold side of the peltier is then placed against the copper cold finger. on the other side of the peltier a CPU heat sink and fan is placed. Thermal paste is smeared on both sides of the peltier to ensure effective thermal heat transfer.A piece of perspex is used to secure the CPU heat sink against the peltier and cold finger.
The heat sink chosen was a Noctua NH-L9i. This is a fairly light weight heat sink/fan combo, but which still has capacity to dissipate both the cooling load, as well as the power required for operation (most of which is also lost as heat). The heat sink must have sufficient capacity to dissipate both of these loads in order to keep the hot side close to ambient and therefore provide efficient cooling on the cold side.
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