Clivet has launched its SCREWLine3 range of R134a air cooled liquid chillers with double screw compressors, featuring free-cooling functionality
The range is available from 520 to 1550kW with free-cooling (both direct and indirect versions) for applications which require cooled water during the cold season, such as industrial processes, data centres, telecommunications, technological applications and shopping centres.
When the outdoor ambient temperature is lower than the return water temperature of the system, the free-cooling system utilises this variance and reduces compressor operation accordingly.
The company claim that even when the performance of a chiller at low ambient temperature is critical and free cooling can be used, for more than 70 per cent of the time compressors are running to provide cooling capacity.
SCREWLine3 adopts various technological solutions such as large heat exchange surfaces, resulting in high efficiency levels at full load, with external temperature over 30 deg C, and for applications in mild climates.
Two independent refrigeration circuits as standard, double screw compressors, variable flow fans, electronic expansion valve and high efficiency shell and tube evaporators contribute to give very high efficiency levels at part load operation with EER up to 3,1 (Eurovent certified).
SCREWLINE3 FC range is also equipped with Axitop diffusers for thermodynamic recovery, which present great advantages in terms of sound levels with a reduction of 3dB(A) in sound pressure and results also in a reduction of 3% in energy absorbed by the fan.
SCREWLINE3 FC also satisfies the Green Building Council requirements for LEED certification of the buildings.