Hazelwood Data Center

St. Louis, MO

Originally constructed in 2000, this facility was designed to support three levels of IT equipment in a unique open-envelope configuration. Each floor is conditioned by a series of central station AHUs with common ductwork connected between floors, creating a single homogenous 3-story volume. In 2010, a new Central Utility Plant was constructed. The CUP houses the chiller plant, engine generators, and UPS systems.

In 2012, TiePoint-bkm was engaged to provide a Strategic Infrastructure Plan to assist the owner with identifying system capacity limitations and developing a roadmap to maximize the available IT Load. The “raised floor” was reconfigured into four Data Halls, approximately 10,000 SF each with an ultimate UPS output capacity of 4,050 kW (3,645 kW at 90% redline).

Infrastructure Features

Critical Power Distribution: Originally designed to support a total building load of 12MW and a critical IT of 6,000 kW at full buildout, the facility is supported by eight 2MW diesel EGs located in two plants. While each EG plant was originally configured for N+1, they now operate at N+2 per plant. The UPS architecture has evolved into a 2N system providing approximately 4MW of critical power.

Chiller Plant: The mechanical plant consists of three 750 ton chillers in an N+1 configuration. A waterside economizer provides free-cooling during low ambient conditions (approximately 1/3 of the year). Cooling tower make-up water is supported from two dedicated water services to the site in conjunction with a 15,000 gallon underground storage tank.

Data Halls: Each data hall is conditioned from a series of central station air handling units connected to a common network of overhead ductwork. Each air handling unit has been retrofitted with a VFD to provide supply air from overhead in each cold aisle in response to rack-mounted temperature sensors. IT cabinets are arranged in a hot aisle/cold aisle configuration complete with cold aisle containment. The original critical power distribution is being replaced with new PDUs serving redundant RPPs located at each end of the IT rows.

Project Highlights

  • Tier III Data Center
  • Four Data Halls
  • 2N UPS System
  • N+2 EG Plant
  • 4,000 kW Critical Load
  • 5 kW/IT rack (avg)
  • 100 w/SF density
  • N+1 Chiller Plant w Free Cooling