Systems


Always the right choice: CyberCool Indoor with three cooling systems

Energy efficiency, investment volume, operating costs, room size, noise protection, redundancy and local climate - every project has its own requirements in terms of appropriate chilled water generation. Our customers can choose between different configurations and so achieve an ideal balance between capital investment, running costs and energy efficiency. STULZ is the world's only manufacturer to offer such a huge range of configuration options.

Air-cooled: The compact standard solution (A/AS)

A chilled water circuit transfers the heat load to the evaporator where the heat is drawn from the water and passed to the refrigerant. The refrigerant gives off the heat to the outside air via an air-cooled condenser.

Benefits of the system

  • Tried and tested, rugged technology
  • Reduced to just the major components
  • Refrigerant used as transport medium for optimum heat transfer

 

 

Water-cooled: Quiet and easy to integrate (G/GS)

Like A/AS on the direct evaporator principle - with one difference: the heat is transferred to a water/glycol mixture via an integrated plate condenser; this mixture gives off its heat to the outside air in a closed circuit via an external dry cooler.

Benefits of the system

  • Integrable in existing chilled water networks
  • Dry cooler can be linked to several units
  • Pumps allow a large distance between the CyberCool Indoor and the dry cooler

 

Water-cooled with integrated free cooling function: Maximum efficiency (GE/GES)

Like G/GS, but with indirect free cooling which replaces energy-intensive compressor operation in part or in full when outside temperatures are low. In FC mode, the heat is transferred straight to the chilled water circuit by an integrated free cooling heat exchanger and given off into the outside air via an external dry cooler.

Benefits of the system

  • TCO leader: Minimal total operating costs over runtime
  • All free cooling (FC) components integrated in the unit
  • The most efficient system thanks to intelligent switching of operating modes (DX - mixed - FC)

 

 

Maximum efficiency with direct cooling

The most efficient mode is selected automatically depending on outside temperature – reliably throughout the whole year and whatever the local temperature profile.

Compressor mode (DX): At high outside temperatures, entire cooling capacity is achieved using the compressor. The use of perfectly-matched components means that the CyberCool Indoor already works extremely efficiently, even in this mode.

Mixed mode: At moderate temperatures, the CyberCool Indoor runs in energy-efficient mixed mode, a mixture of free cooling and significantly-reduced compressor cooling.

Free cooling mode (FC): At low outside temperatures, free cooling delivers the greatest potential savings. In this case, only outside air is used for cooling, compressor cooling is switched off completely.

(Illustration at right: temperature profile of hamburg)

Dynamic Diagram

And what about you?

The interaction of compressor cooling and free cooling is directly dependent on factors such as installation location, cold water temperature and temperature spread and is therefore decisive for efficient operation. Try out which parts of the compressor, mixed and free cooling mode are used at your installation site:

     

  1. Select the desired location.
  2.  

  3. Set the temperatures at the cold water inlet and outlet to the desired values.
  4.  

  5. The switch-over points of the operating modes adapt dynamically to your settings.
  6.  

 

 

 

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STULZ GmbH
Holsteiner Chaussee 283
22457 Hamburg 

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

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