Julian Kudritzki, Uptime Institute vice president, spoke at the ribbon cutting ceremony for the new Harris data center.
According to Uptime Institute Professional Services Consultant Chris Brown, the chilled water system is a typical solution for a Tier III data center. It is a looped piping system with strategically located isolation valves to allow sections of the piping system to be isolated for maintenance without impacting the computer rooms. The chiller-cooling tower combination utilized packaged units. The packaged units ease the design to make the control system concurrently maintainable. In large condenser water systems, it is difficult to operate the cooling towers without automatic control since condenser water temperature typically needs to be held in a fairly tight window. This makes running cooling towers in a local manual mode difficult. The packaged systems use on board controls that are independent of the larger building automation system.
The interesting part is the UPS system, Brown said. A typical Tier III solution is to utilize a system + system arrangement. So if the design load was 1,000 kW the design would utilize two 1,000 kW systems. The management of that type of system is easy as one only has to ensure that each dual corded computer device has a feed from each UPS. But the cost is a 50 percent stranded capacity (45 percent with a 90 percent redline). Also static UPS systems do not run at peak efficiency the lower they are loaded.