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110 bytes added, 11:00, 23 February 2018

→‎Heat Pipes

==== Multi-layer Insulation (MLI) ====

Protects the spacecraft from excessive solar rays. Acts as a radiation barrier.

[[File:PTC1.png|frame|center|Illustration of the working of MLI]]

==== Coatings ====

q(space)= q(loses) + q(electric)

[[File:PTC2.png|frame|center|Radiator illustration]]

=== Active Thermal Control (ATC) system ===

*Flat sheet heaters use the Joule effect

[[File:PTC3.png|frame|center| Patch heater]]

==== Louvers ====

*Shield radiator surfaces to moderate heat flow to space

* '''Principle:''' Bi-metallic spring sense the radiator temperature, open/close the radiator to deep space.

[[File:ATC3.png|thumb|center|600px| Louver mechanism. Image inspired from [http://www.tak2000.com/data/satellite_tc.pdf here]]]

====Heat Pipes====

*Wicking material returns fluid to hot end

*Provide high heat transfer rates even with small temperature differences

[[File:ATC1.png|frame|center|Heat Pipe Mechanism. Image reproduced from [https://commons.wikimedia.org/wiki/File:Heat_Pipe_Mechanism.png here]]]

===Comparison of Passive and Active Thermal Control ===

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