Free Cooling

Major energy savings thanks to Free Cooling

Direct Free Cooling enables energy savings of up to 80 %. 

Direct Free Cooling 

Operating modeOutside temperatureOperation
Free Cooling Outside temperature between supply air temperature set point and minimum frost protection temperatureOutside air damper opens. Outside air flows through the filter directly into the unit, then into the Data Center; compressor off. The circulating air and outside air dampers are open if the outside temperature drops or the heat load decreases. They mix circulating air with the outside air, keeping the supply air temperature constant; compressor off. 
Adiabatic Free CoolingOutside temperature above supply air temperature set pointIf the outside temperature exceeds the supply air temperature set point, an adiabatic cooling unit cools the outside air, exploiting the available Free Cooling potential to the full. Outside air damper open; compressor off. 
Mixed modeOutside temperature rises continuouslyCompressor is switched in for support to exploit Free Cooling mode to the full, outside air damper open, compressor running in partial load mode.
DX modeOutside air outside the range for Free Cooling or Mixed modeThe unit runs in Compressor mode; outside air damper closed.
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