Free air cooling uses evaporative coolers. They are not running chillers. Belgium also has a water treatment center bringing in water from an industrial canal for their coolers and thus runs on 100% recycled water.
In Finland, they run heat exchangers with water from the Baltic Sea, again, a chiller-less data center.
In Finland, they run heat exchangers with water from the Baltic Sea, again, a chiller-less data center.
Document from Google that talks about their cooling: http://www.google.com/about/datacenters/inside/efficiency/co...