Patent ID: 8295047

Claim:
A method of providing cooling by a cooling system to a computer data center, the method comprising: providing a first cooling water circuit arranged to circulate first cooling water between (a) equipment that cools air circulated inside the computer data center and (b) one or more water-to-water heat exchangers; providing a second cooling water circuit arranged to circulate second cooling water between (a) the one or more water-to-water heat exchangers and (b) a plurality of closed water-to-air heat exchangers that have powered fans for circulating atmospheric air across a plurality of coils; mechanically circulating water through the first cooling water circuit to draw heat from the data center and to provide the heat from the data center to the second cooling water circulated through the one or more water-to-water heat exchangers; and mechanically circulating water through the second cooling water circuit to draw heat from the second cooling water circulated through the one or more water-to-water heat exchangers to the atmospheric air circulated through the one or more water-to-air heat exchangers outside the data center, wherein water in the first cooling water circuit is isolated from water in the second cooling water circuit, and both cooling water circuits are closed so that water in both cooling water circuits is isolated from an ambient environment around the cooling system.