Comment Re:Who uses fans to circulate liquid anything? (Score 1) 56
I bet there's some misunderstanding on the reporter/marketer's side, whether deliberate or not, to make this seem cooler (heh) than it is. Conventional refrigeration systems already exist that use carbon dioxide, though they seem to be more focused on walk-in coolers and such rather than air conditioners. The only technical challenge to using carbon dioxide as a refrigerant is that the whole system runs at a much higher pressure than those using more conventional fluorocarbon refrigerants. That means they need to be much more ruggedly engineered and built, which adds cost. Long runs of piping through a large building makes that even more of an engineering challenge. I suspect that's where more of this "rocket technology" is used.