Patent ID: 8590333

Claim:
A system for providing cooled air to a data center, comprising: a data center having electronic equipment, wherein the electronic equipment is in operation; a cooling water source; a plurality of on-floor cooling units in the data center, each on-floor cooling unit configured to cool air warmed by a sub-set of the electronic equipment in the data center; a plurality of proportioning control valves, each proportioning control valve associated with a single on-floor cooling unit; and a controller, wherein each proportioning control valve is configured to turn in response to a signal from the controller, the valve able to be closed, fully open or partially open, wherein when the valve is closed, water is blocked from the on-floor cooling unit, when the valve is fully open, a maximum volume of water is circulated through the on-floor cooling unit, and when the valve is partially open, some percent less than 100% of the maximum amount of water is circulated through the on-floor cooling unit, and wherein the controller is configured to turn the corresponding control valve in response to a change in temperature.