Cyrus Gerami: I recently worked with a national collocation client on a 180,000-sq-ft Tier 21 collocation data center in Fairfax County, Va. It is a four-story building with an infrastructure cellar and eight co-location suites (N+l MEP). The central chiller plant uses highly efficient magnetic oil-free compressors and evaporative condensers. Use of waterside and airside economizers is being closely evaluated. The facility power is backed up by eight 2.5 MW standby generators plus a ninth swing generator. In another project, for a national wireless phone company, we're working on a 21,000-sq-ft wireless company switch room expansion using a refrigerant cooled rear-door cooling system. At another wireless phone company, we are working on an $80 million expansion and renovation of an existing data center. This facility has an N+N redundancy capacity, which includes two separate utility power services and twice as many emergency power generators. The facility has 184,000 sq ft of building area with 70,000 sq ft of raised floor. Use of computer room air handler (CRAH) with airside economizer and ultrasonic evapo-
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