It is much easier to transfer X amount of heat with a liquid than with air. Liquid travels in pipes and has enormous mass heat capacity (Per unit of volume, water has about 3200 times the specific heat capacity of dry air (at 77°F)). Air needs wide straight ducts and fans every 10 meters to keep air flowing.
Sure, but removing that heat to the outside still takes the same amount of energy. Unless they just pour the water down the drain it has to be transferred somewhere, no?
Wouldn't that depend on the sink? If they can cool down to the water, then running a water-water-heatexchanger would require less power (due to better heat transfer) than simply cooling it to the air.
Same I guess if they could use evaporation to do some of the cooling.
Just seems like a really complicated setup to use unless you were going to be saving enough power to make all the complexity worth it. Remember you have to put a water block on each card and design a pump and piping system that will run through all of them.
