Server & Data Center

The MEP portion of the project was fairly complex, and was designed as follows: The existing server farm was consolidated from multiple rooms into one large server room which was expanded to accommodate server racks and related equipment. The enlarged room and IT infrastructure was sized to handle the district's future IT needs based on an eventual complete build out of the district. The upgraded facility was also designed with enough flexibility to handle IT changes anticipated over time. The racks' design heat load was 6-10 kW per rack, and the new HVAC and electrical systems were designed for N+1 redundancy. An overhead air supply system, served by packaged roof top A/C units (two 10-ton units), addressed building thermal loads such as walls, roof, people, lights, and ventilation air. The air supply ductwork was interlaced to allow for redundancy so that a failure of one RTU would not hinder operations in any way. These units also provided positive air pressure, continuously forcing air out of the space to prevent unconditioned outside air, dust, dirt, and debris from entering the space and jeopardizing the equipment. These units are also equipped with a higher level of air filtration, an ASHRAE filter effectiveness rating of MERV 13, which removes not only dust, but also paint pigments, bacteria and smoke from the air. The server racks included in-row cooling units, with variable speed fans, that provided for a hot aisle-cold aisle arrangement with physical enclosures used around the racks to allow this scheme to function properly. A few of the in-row cool-ing units included humidification capabilities to maintain a minimum relative humidity while the units also limit the maximum relative humidity in the space. The cooling units are served by a chilled water system with piping that is routed in a concrete trench below the equipment and which includes drains and a water detection and alarm sys-tem. An outdoor packaged air cooled specialty (customized) chiller was utilized to serve this system. It includes dual parallel pumps, variable frequency drives, and multiple chiller modules. It also has enough space and capacity for the addition of future chiller modules and independent stand-alone controls so that no single component failure would hinder meeting load. The chiller was also set up for variable flow. Initially 80 tons of chiller capacity was in-stalled with the capability to expand to approximately 130 tons. Make-up water to the humidifiers was filtered to prevent fouling sensitive components. A fire suppression system was provided to serve this space in order to mini-mize the use of a wet pipe sprinkler system as much as possible. A new 80 kW Uninterruptible Power Supply (UPS) system with battery back-up (15-30 minutes capacity), was installed with expansion capabilities. A stand-by power supply system of generators was also incorporated into this project which included the re-use of two existing smaller generators and the addition of a new 750 kW generator. The stand-by system can also be expanded by one addi-tional 500 kW generator in the future as needed. Dual circuited Power Distribution Units (PDUs) were provided for each row of equipment racks.