HP Modular Cooling System manual Free cooling strategies

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

Density (nodes per rack)

	Supplemented
	data center
50		cooling
	Traditional	Cold/hot		Chassis/component
			Closed-loop	level cooling,
	open-area	aisle		future cooling
25	cooling	containment	cooling	technologies

8 16 24 32 40

Power (kW 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.

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