Free Cooling

Potential savings thanks to Free Cooling with the CyberAir 3 CW

In temperate climes north and south of the equatorial zone, the energy-saving advantages of the STULZ CyberAir 3 CW with Indirect Dynamic Free Cooling can be exploited to the full.  

Regions suitable for Free Cooling

Indirect Dynamic Free Cooling with two chilled water coils (CW2)

Consists of a heat exchanger with speed-controlled fan, speed-controlled heat exchanger pumps, chiller, speed-controlled chiller pumps and closed-circuit air conditioning units with two chilled water circuits. 

Direct Free Cooling for small to medium-sized Data Centers

To enable Direct Free Cooling to be used in small and medium-sized Data Centers as well, the CyberAir 3 CW units can be equipped with the FreeCool Plenum Free Cooling box. 

CyberAir 3 CW with FreeCool Plenum

The downflow unit with FreeCool Plenum combines Free Cooling and compressor cooling in 4 stages:

Free Cooling
Outside air damper opens. Outside air flows through the filter directly into the unit, then into the Data Center; compressor off.

Extended Free Cooling
The cooling capacity is kept constant by increasing the airflow. Outside air damper open; compressor off.

Mixed mode
If the fan reaches maximum speed and Extended Free Cooling is no longer sufficient, the compressor is switched on for support; outside air damper open; compressor runs in partial load mode.

DX mode
The unit works in Compressor mode; outside air damper closed.

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