Direct Free Cooling

Potential savings thanks to Direct Free Cooling

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

Regions suitable for Free Cooling

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 3PRO DX units can be equipped with the FreeCool Plenum Free Cooling box. 

CyberAir 3PRO DX with FreeCool Plenum

The CyberAir 3PRO DX with FreeCool Plenum combines Free Cooling and compressor cooling in 3 stages:

1. Free Cooling

  • The outside air damper opens
  • Outside air is conveyed through the filter of the FreeCool Plenum directly into the unit, then into the data center
  • The compressor of the unit remains off, completely saving the cooling energy normally required

2. Mixed mode

  • As 1, plus:
  • The compressor of the unit is additionally switched on for support
  • When the outside air damper is open, the compressor of the unit runs in partial load mode
  • The return air damper of the FreeCool Plenum opens to the appropriate degree

3. DX mode

  • The CyberAir 3PRO DX cools exclusively using the compressor
  • The outside air damper remains closed, and no outside air is used for cooling
  • Return air damper open 100 %


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