Originally Posted by bfeng91
Well yes, it may not be a perfect vacuum, but there's still very few particles to take heat away from the components. Air cooling works as the heat is transferred from the heatsink to the air. In space, there isn't anything to pass over the heatsink or chip itself to cool it down.
Quote, " Waste heat is removed in two ways, through cold plates and heat exchangers, both of which are cooled by a circulating water loop. Air and water heat exchangers cool and dehumidify the spacecraft's internal atmosphere. High heat generators are attached to custom-built cold plates. Cold water -- circulated by a 17,000-rpm impeller the size of a quarter -- courses through these heat-exchanging devices to cool the equipment.
"The excess heat is removed by this very efficient liquid heat-exchange system," said Ungar. "Then we send the energy to radiators to reject that heat into space."
I guess there is still enough particles in space for convection to take place. Maybe the extreme temps temps in space helps overcome the lack of matter to pass heat.