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Air-side economization

Air-side economization uses a system of supply and return fans, filters, and dampers that maintain

positive air pressure with respect to the IT equipment exhaust, and positive data center air pressure

with respect to the outside. Air-side economization may also include supplemental cooling coils that

you can switch in and out of circuit as needed for changes in climate. You can implement air-side

economization as either a direct or indirect system. In direct air-side economization, outside air is

filtered, stabilized for relative humidity, and then delivered to the ITE racks (Figure 4). The ITE rack

layout and exhaust venting is similar to a hot-aisle containment strategy.

Figure 4: Air-side economization (direct method)

Air-side economization using the direct method is more applicable in cool regions where outside air

requires little or no refrigeration.

With indirect air-side economization, outside air cools data center air through an air-to-air heat

exchanger. This method uses two air circulation circuits: one for outside air and one for inside air.

Outside air is collected, cooled, and then used to cool re-circulated indoor air in a heat exchanger

that is common to both air circulation circuits. The two air circuits share the heat exchanger, but

indoor and outside air flows are segregated. Even though it requires two fan systems, indirect air-side

economization can be more energy efficient and may be the preferred method for warmer climates.

Exhaust

Filter/fan

Input

Filters/fans

Exhaust

air to

outside

Air from

outside

ITE racks

Room requirements:

Air circulation system built into facility

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HP Modular Cooling System Informationsblatt Seite 5