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The increasing heat loads created by the latest server systems require more aggressive cooling
strategies than the traditional open-area approach. Such strategies include the following:
Free cooling
Air containment
Closed-loop cooling
Figure 3 identifies cooling strategies and implementations based on kilowatts per rack and on the
server density per rack.
Figure 3: Cooling strategies based on server density/power per rack
Free cooling strategies
Free cooling strategies use ambient outside temperature to remove heat from inside a data center.
You can implement free cooling as either a primary or secondary system. Free cooling systems take
advantage of regional climate conditions for more efficient operation, but they do include mechanical
and electrical equipment. Free cooling is generally applied using one of two methods: air-side
economization or water-side economization.
Cold/hot
aisle
containment
Density (nodes per rack)
8
Power (kW per rack)
16
24
32
40
Closed-loop
cooling
Traditional
open-area
cooling
Supplemented
data center
cooling
Chassis/component
level cooling,
future cooling
technologies
25
50
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