A thermoelectric generator module (TEG) to power a motor with a fan. The heat source (candle) heat up the lower aluminium plate => creates a temperature difference over the module => generates electricity to the motor => increases air flow through heat sink => increases temperature difference => more power. Without the fan it would eventually stop generating power since the heat sink would get almost same temperature as the plate.
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Thermoelectric coolers ( TEC or Peltier ) create a temperature differential on each side. One side gets hot and the other side gets cool. Therefore, they can be used to either warm something up or cool something down, depending on which side you use. You can also take advantage of a temperature differential to generate electricity. The thermal tape listed below works very well to attach heat sinks to the hot side.
Details about High Temperature Thermoelectric Module