PDX Concourse A HVAC Replacement
CHA, PAE and KPFF worked with the Port to design and install a significantly upgraded HVAC system on both levels of concourse A. the scope involved replacing two 30-year-old existing rooftop HVAC units, each serving its own floor, with a single new Variable Refrigerant Flow (VRF) system for both the passenger areas and operations spaces for Horizon Air. The VRF system included replacement of approximately 30 existing VAV boxes with new fan coil units, 6 new rooftop condensers, a new rooftop ventilation unit, new shafts for connecting ductwork and piping on both levels into a single system, and extensive refrigerant piping throughout the facility. Work had to be performed without taking the existing cooling systems offline for extended periods, and was planned around very tight construction windows, as concourse A is one of the busiest areas at PDX. The project also coordinated its efforts around the redesign of a concessions space on the concourse, and worked around the operations of an existing full-service restaurant.