Replacement of the existing VRF HVAC system with a new closed-loop Water-Source Heat Pump system consisting of two (2) TEFC end-suction pumps, two (2) condensing boilers, one (1) closed-circuit cooling tower, and new water-source heat pumps. The new water source heat pumps will be located above the ceiling over corridors with new supply, return, and outdoor air ductwork connected to new supply and return diffusers. The four (4) existing energy recovery ventilators on the roof will remain and be re-used to provide ventilation air to the new water source heat pumps. The existing rooftop units and exhaust fans will are to remain. New condensate and electrical power will be required for the water source heat pumps. New electrical sub-panels will be required at each floor to provide power. A new structural steel frame will be provided to support the new closed-circuit cooling tower on existing structural support piers. New high-density polyethylene piping will be used to connect central plant equipment and water source heat pumps. Piping will be routed to the tower building on top of the roof and up the exterior of the tower to serve each floor, except for the first floor. The piping will drop down via an existing chase from the 2nd floor to the first floor. The existing ceiling grid, lay-in ceiling tiles, and gyp. board ceilings are to be removed and lowered as required at each floor. The existing lay-in ceiling tiles will be reinstalled in the new ceiling grid in addition to new tiles as required by the new grid. Existing building fenestration is to be tinted on the South and East facades.
