Keeping Cool

Kava said he's been at Google more than six years and in that time the company has changed the cooling technology it uses at least five times.
Most data centers have air conditioning units positioned around perimeter walls that force cold air under the floor to rise up and cool the servers.
Google's solution puts server racks right up against air conditioning units. Heat from servers travels down a hot aisle and is transferred to cool water running through copper coils. The water runs out the building to a cooling tower, then flows back in to the data center for the process to repeat.