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Thermal diode
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==Thermoelectric heat-pump or cooler== There are two types. One uses [[semiconductor]], or less efficient metal, i.e. [[thermocouple]]s, working on the principles of the [[Peltier-Seebeck effect]]. The other relies on vacuum tubes and the principles of [[thermionic emission]]. ===Peltier devices=== * a heat engine working backwards as a [[refrigerator]], such as a [[Peltier device]] (diode)
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