Greg Poste, Project Architect
The new HVAC system includes a centralized natural gas fired make-up air unit coupled with energy recovery ventilation, and dual ultra-high efficient natural gas heating boilers supplying perimeter hydronic finned tube radiators and force flow cabinet heaters at vestibules. The make-up air unit was custom sized to fit inside the existing mechanical room (8’-0” wide), rather than housing on the roof which would have required structural upgrades to the roof, support walls and foundations that may have impacted the construction schedule beyond the start of the new school year. The manufacturer of the make-up air unit was engaged early in the design phase of the project (March 2014) to ensure existing limitations could be accommodated, and pre-ordering was necessary to ensure timelines for shop drawing review, fabrication, installation and commissioning could be met for the end of August 2014.
Existing exposed roof deck and structure were concealed in all areas, except the gymnasium, with lay-in suspended acoustic tile ceilings, to house new energy efficient lighting fixtures and conceal above ceiling ducting and piping distribution. Careful design planning was required to route large duct branches to avoid interference with the new hydronic system and existing structural systems. The existing domestic water supply was below the floor slab and was abandoned and re-routed in the new ceiling plenums to facilitate supply for new plumbing fixture layouts.