Tucson City Courts Chiller Replacement
Tucson, Arizona;The Tucson City Courts chiller replacement project involved upgrading of the chilled water system from a primary-secondary chilled water system to a primary-variable flow chilled water system. The conversion included the replacement of both 200-ton water-cooled chillers with two 200-ton McQuay WMC centrifugal chillers with frictionless bearings. Each replacement chiller was provided with a variable frequency drive (VFD) to maximize the efficiency of the chilled water plant. The system water pumps were upgraded to chilled water pumps in a primary/backup configuration with inverter-duty motors and VFD’s. The existing condenser water pumps were reused to circulate condenser water from the water-cooled chillers to the replacement cooling towers. The replacement cooling towers fans were provided with inverter-duty motors and VFD’s to reset the condenser water supply temperature to the water-cooled chiller.