Eco-Cooling Module

Adiabatic cooling
Adiabatic cooling is based on the principle of heat extraction through the evaporation of water. Outside air is used for this cooling principle.

Outside air contains a certain amount of water vapor, expressed in the relative humidity (RH). The RH determines the adiabatic cooling capacity. Desert air, for example, has a low RH, while tropical air has a high RH. Large parts of Europe and North America have a moderate RH and moderate temperatures.

The adiabatic cooling principle is ideally suited to locations with a moderate to low RH, since lots of moisture is absorbed by evaporation there. Evaporation is accompanied by heat absorption, causing cooling to occur. As heat is extracted from the air through evaporation, the air temperature drops thereby making it suitable for cooling IT equipment.

Indirect adiabatic cooling
The indirect process employs two air flows: an outside air flow and an opposing process air flow, originating from the IT equipment. These air flows do not come into contact with one another. The outside air flow is passed along a moistened surface causing water to evaporate (depending on the RH). The temperature of the outside air flow falls as a result.

By means of a heat exchanger the cooling effect is transferred via planes to the process air that is passed along the other side of the planes. The warm process air transfers its heat via the planes and is cooled to approx. 24º C. This air is then fed back to the entrance side of the servers to act as cooling medium.

The process air is therefore continuously circulated, with outside air being drawn in and expelled for adiabatic cooling.

This yields a number of benefits compared with systems in which outside air is pumped directly into the IT space:

• No moisture is added to the process air. As a result, the RH is constant.
• Low energy usage (PUE <1.2).
• No outside air enters the IT space.

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