UK: Carrier AquaForce water-cooled screw chillers, with a combined cooling capacity of more than 1.4MW, are providing high efficiency cooling at Wiltshire County Council’s Trowbridge headquarters. The two Carrier high performance AquaForce 30XW-V variable speed R134a chillers selected employ inverter-driven twin-rotor screw compressors. These enable the chiller to achieve ESEERs
PROBLEM: High-rise buildings, built in 1960’s, were experiencing scaling, bio-film and dirt (rust) deposits in their condenser water systems. This inhibited heat transfer, lowering HVAC hydronic system efficiency. Previous traditional solutions (chemicals & flushing) failed to stop the cooling towers and chillers from scaling up. This required that they be
A VFD controls the frequency of the power supplying AC motors, such as those found in the compressors of chilled water cooling systems. It controls the speed of the motor, adjusting the input frequency and voltage. The motors on compressors are sized for the maximum capacity of the system. However, they need to run at only a fraction of this capacity for the majority of the time. The VFD will match the motor speed to the demands being placed on the system.