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A typical thermoelectric module is shown left. The module consists of pairs of p-type and n-type semiconductor thermoelements forming thermocouples which are connected electrically in series and thermally in parallel.
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* In cooling mode, an electrical current is supplied to the module. Heat is pumped from one side to the other (Peltier effect), the result is that one side of the module becomes cold.
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* In generating mode, a temperature gradient is maintained across the module. The heat flux passing through the module is converted into electrical power (Seebeck effect).
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