In general, selecting the size of
TECs depends on the area of chips, but not bigger than that. Additionally, TEC has a certain thickness, which is put between chip and heat sink. If it is too thick, it will be hard to fix.
Fig. 2. Physical photo of TEC
Generally speaking, the operating temperature of TEC is about under 50℃, that is: CPU should work in the range of operating temperature. As the maximum temperature difference can be up to 65℃, if the hot end temperature is not over 65℃, in the limit case, the temperature of the cold end can reach 0℃ or even under 0℃.
As shown in fig. 2, the TEC should be fixed according to the order of heat sink-TEC-CPU. Interface between TEC and the other two parts should be smeared with thermal grease, which can not only be useful to transmit heat, but also to buffer.
Fig. 2. Installation diagram of TEC
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