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Working fluid in the wick absorbs heat and and evaporates. The vapourised fluid mixes with the vapour phase which is moving in the center of the pipe. Due to tendency of moving towards lower temperature, vapour reaches the radiating surface to transfer the heat to the heat sink. By low heat energy the vapour condenses. Annular Wick structure helps in movement of condensed vapour to the heat extracting point and again this cycle takes place.
Driving mechanism is the temperature difference between source and the radiator.
[[File:ATC1.png|frame|center|Heat pipe mechanism. Image reproduced from [https://commons.wikimedia.org/wiki/File:Heat_Pipe_Mechanism.png here]]]
=== Louvers ===
*The actuators actuate the blades according to the desired and current temperatures.
[[File:ATC3.png|thumb|center|600px|Louver mechanism. Image inspired from [http://www.tak2000.com/data/satellite_tc.pdf here]]]
=== Heaters ===
*These resistors generates heat when current is passed through them.
[[File:PTC3.png|frame|center|Heater]]
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