Free Cooling


Potential savings thanks to Free Cooling with the
CyberAir 3PRO CW

In temperate climes north and south of the equatorial zone, the energy-saving advantages of the STULZ CyberAir 3PRO 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 Centres

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

CyberAir 3PRO 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 Centre; 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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