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Air-cooled water chillers for free cooling offered highly efficient performance and lower investment costs

Risk of runaway installation costs

A set-up with water-cooled machinery and free cooling from external systems was planned to achieve these values. Because the data centre was supposed to be fitted out with compact air-cooled chillers, there was a risk that the actual investment costs for the new system would be substantially higher than estimated. The client needed a highly-efficient installation that would meet the requirements without investment costs running away.

Rigorous efficiency requirements

The engineers at Swegon-owned BlueBox in Veneto, Italy suggested that the client invest in equipment built around its KAPPA REV unit, with free cooling and ultra-quiet performance (*LGW FC + SLN). Kappa REV is an energy-efficient unit with screw compressors, tube heat exchangers and HFO refrigerant.

Compact design freed up space

The Energy Efficiency Ratio (EER) ratings achieved with KAPPA REV are so good that all the requirements can be met. Moreover, the unit operates with a built-in hybrid system for free cooling in the spring and autumn, which minimises the client’s  costs. Its compact design also made it possible to free up 200 m2 of internal space where more data racks could be installed.

Efficient solution with free cooling reduced costs significantly

The investment costs for the installation were CHF 400,000 less than originally quoted, thanks largely to the free-cooling solution. With the help of the BlueBox solution, in which a free-cooling module in the stand-by machine achieved a very high degree of efficiency, TFT was obtained when the outdoor temperature was just 11°C, i.e. the temperature at which free cooling meets all the cooling requirements (Total Freecooling Temperature).