Bravern, International Software Developer Tenant Improvement
In another project for this repeat client, an International Software Developer, we completed two full buildouts at the Bravern Office Commons totaling 739,000 sf. Between the two buildings, this client houses employees on 33 floors which include offices, conference rooms, multi-purpose rooms, locker rooms, espresso bars, two full-floor cafés, and an 11,000 sf server lab.
The server lab houses more than 500 server and network racks in approximately 11,000 sf. Overall design cooling capacity is 675 nominal tons, which delivers 215 watts/sf, or just under 5kw/rack.
The cooling system consists of three water-cooled centrifugal chillers that serve the entire building (floor-by-floor AHUs) including four CHW AHUs dedicated to the Lab. There is N+1 redundancy; only three of these AHUs are required to provide the cooling noted above. The AHUs are tied together with a single supply header on the roof that then has multiple drop points into the lab ceiling. There is a large return plenum on the roof with direct openings into the ceiling and ducted connections back to the AHUs.
The lab configuration is hot aisle/cold aisle with plenum supplies the length of the cold aisle, and plastic strip curtains separating hot/cold. Each plenum is fed from both sides by VAV boxes for redundancy. There are dual sensors in each aisle controlling the VAVs.
The UPS equipment, batteries, and switchgear are located in a room beneath the lab that is served by the same AHUs via shafts penetrating down to serve the room. Power comes up from this room to wall mounted PDUs along the corridor wall inside the space. Power distribution in the space is run both above and beneath the ceiling.
Cable tray is located beneath the drop ceiling in the hot aisle, with communication cabling drops directly into the racks from behind.
Fire protection consists of a wet sprinkler system above ceiling with drops in all aisles. There are separate VESDA systems for the Lab space and the UPS room to provide early warning and notification to the fire alarm panel.