Free Cooling

Free Cooling

The Free Cooling of the CyberCool 2 uses the outside temperature, which offers the greatest potential savings of all, especially in cold and temperate climates.

Figure: Operating modes CC2 chiller

No efficiency without "Mixed Mode Boost"

The outstanding performance values of the CyberCool 2 come into their own in Mixed mode: it makes efficient use of condensation pressure control to reduce the amount of energy consumed by the compressors to a minimum.

Innovation: Unlike conventional solutions, with "Mixed Mode Boost" the CyberCool 2 makes 100 % use of the surfaces of the DX coils without reducing the fan speed, dramatically enhancing energy efficiency and slashing operating costs.

When outside temperatures are low, Free Cooling can completely replace energy-intensive compressor cooling. In temperate local climates, the CyberCool 2 runs in energy-efficient Mixed mode, i.e. a mixture of Free Cooling and compressor cooling.

DX mode/Compressor cooling: The CyberCool 2 cuts operating costs to a minimum in every operating mode, even in relatively energy-intensive DX mode: in DX mode, the CyberCool2 achieves the best efficiency values in mission-critical applications compared with competing systems – every time.

Free Cooling: At low outside temperatures, the water is cooled solely with the aid of these temperatures. Energy consumption is reduced to an absolute minimum thanks to the maximized Free Cooling coils and early, infinite switchover points.


CyberCool 2 - Top of the class in energy:

  • Early switchover to Free Cooling
  • Maximum use of Free Cooling coils in Mixed mode
  • Coils designed with the maximum surface area



Figure: Separate glycol and water circuit

Click to enlarge

Free Cooling with a separate glycol and water circuit

There are some buildings where glycol cannot be used. Therefore, with the "Non-glycol option" glycol is now only used in the Free Cooling circuit. This option provides the benefits of Free Cooling while refraining from the use of glycol in the building.

However, by separating the Free Cooling and chilled water circuits with an additional brazed plate heat exchanger, the switchover points to Free Cooling and Mixed mode do shift by a few degrees Celsius.

To be energy-efficient, the chiller must run in Mixed and Free Cooling mode as early as possible.

Contact us

Please choose your contact

  • Contact Sales
  • Contact Service
More contact options

Share via

Login on E-Stulz

for detailed technical specs

Contact us

Holsteiner Chaussee 283
22457 Hamburg 

Central Office: +49 40-5585-0
Fax: +49 40-5585-352

Contact us
To top