Build-out of 30,000 square feet of "shelled" raised floor area and upgrades for 15,000 square feet of "live" raised floor in existing stand-alone data center, including expansion of the existing central mechanical systems to support the expansion. The design focused on energy efficiency of the new systems and improving the efficiency of the existing systems.

• Tier III data center with all systems designed with a minimum of N+1 redundancy.
• Fifty new chilled water computer room air handlers (CRAHs) cool the new 30,000 square foot raised floor area, with a current load of 50 W/sf and future growth to 100 W/sf.
• New CRAHs utilize variable airflow control to reduce energy consumption.
• The CRAH locations and raised floor air outlet arrangement were determined utilizing CFD modeling (see image above).
• A new air handling unit provides pressurization and low energy ultrasonic humidification of the raised floor areas.
• The addition of three chillers and associated cooling towers resulted in a final plant configuration consisting of six 600 ton electric centrifugal chillers, four with VFDs, and nine counter-flow evaporative cooling towers with VFDs.
• Two 12,000 MBH chilled water plate-and-frame hydronic economizer heat exchangers were added and modifications were made to the existing hydronic economizer piping to improve performance of the "free-cooling" mode.
• The operation of the chilled water system was optimized through the utilization of an extensive chilled water system analysis. Modifications were made to the existing control sequence to reduce energy consumption. These modifications included raising chilled water supply temperature, operating VFD chillers at their optimal efficiency range, and optimizing condenser water temperature versus cooling tower fan and pump energy consumption.