This recent case study from Daikin focuses on a Houston-based condominium complex built in 1991 that consists of three high-rise towers overlooking a local park. Each tower contains 22 floors, featuring 100 residences and penthouses. The complex also features a large fitness center, private meeting rooms and other common areas.
The HVAC equipment serving the common areas of the complex was original to the building and featured two, 450-ton chillers with onboard controls. The units were designed to work in tandem if necessary, but also independently to provide redundancy, should one of the units fail or require service.
Working with a local Daikin Applied supplier and installer, a recommendation was made for a Daikin Magnitude® 450-ton magnetic-bearing WME chiller as the primary chiller solution. Magnetic bearing technology eliminates oil, mechanical seals, wear surfaces, and gears for longer machine life and increased reliability. Plus, with direct drive technology and integral variable frequency drives, the Magnitude chiller can ramp up and down based on cooling demand rather than operate at a constant rate.
As a result, the machine is up to 40 percent more efficient than a standard centrifugal chiller. Further, the Magnitude chiller operates quietly and reliably, which is ideal for a residential complex. A second chiller, a 380-ton Magnitude WMC, completes the solution. It offers sufficient redundancy but also helps with the turndown ratio — lowering demand levels and delivering additional energy savings.
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