LCI have recently completed a major infrastructure upgrade for an ANZ Data Centre comprising the provision of 2 additional 625kVA rotary UPS units connected in parallel to the existing UPS infrastructure operating in 2 (n+1) configuration.

In addition the Data Hall cooling system was upgraded with the provision of an additional six 56kW dynamic free cooling process cooling units (PCU's). In the PCU's heat from the direct expansion (DX) refrigerant circuit is transferred to a water-glycol mixture by a plate-type condenser integrated in the PCU. The water-glycol mixture circulates in a closed circuit and emits heat to the atmosphere via external dry coolers. When ambient temperatures permit, the DX circuit is isolated and the PCU units operate in free cooling mode. The PCU units are operated in n+2 configuration and associated condenser water pumps operated in n+1 configuration.