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omnichad t1_jdr836d wrote

Reply to comment by The_Flurr in TIL: Thanks to poor internal communication at NASA, information about a spacesuit water leak wasn't properly communicated. Later, Astronaut Luca Parmitano almost drowned on a July, 2013 ISS space walk, his helmet filling with several liters of water before they could get him back inside. by OvidPerl

Your skin and sweat are already the same temperature. Just as you say later on, thermal energy is used to change state to vapor. Because water and skin conduct heat, it will equalize and cool your skin.

Just plain circulating liquid cooling is a closed loop without a state change. Unless you are talking about refrigeration. Then compressed gas is hotter than ambient and then equalizes with surrounding air outside the radiator. And then when the refrigerant is depressurized, it has a lower thermal density than ambient air and can chill things.

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