Salisbury Hospital chiller project breaks new ground with underground DX pipework

摘要

A major R22 chiller replacement project at Salisbury Hospital has set what is believed to be a new industry record for underground refrigerant pipework on a Turbomiser installation. Four new chillers, with a combined cooling capacity of some 1.4MW, are connected to air-cooled condensers by DX pipework up to 75m in length. The large-gauge copper tube - up to 3 5/8" on the discharge and 2 5/8" on liquid lines - runs beneath a road in a concrete-lined culvert. The installation, which took nine weeks to complete, required refrigerant pipe to be mounted on custom-fabricated brackets every 1.5m along the length of the underground structure. Each chiller and condenser is on an independent circuit. The high efficiency R134a-based chillers replace four aging R22-based units on dual screw compressors, believed to be up to 20 years old. The Turbomisers were installed on the existing mounting points, however they occupy two-thirds the space, due to their high performance relative to their size.