![]() Because the Danfoss Turbocor centrifugal shaft levitates within a magnetic field, the need for oil is eliminated.” But Smardt chillers avoid all that complexity. To maintain oil at proper levels, the oil management system uses elaborate piping, traps and risers. ![]() “In a hermetic compressor, oil circulates within the refrigerant gas. The installation was also simplified because Danfoss Turbocor compressors don’t require an oil management system. ![]() Consequently, the weight and size dimensions prohibit using the elevator. A conventional 300-ton centrifugal chiller would weigh around 12,000 pounds empty. “The building’s large freight elevator was rated to hold up to 7,000 pounds. We transported the parts by elevator to the penthouse. It’s so much easier that way - if a chiller can fit into the elevator.” The empty weight of a 300-ton WA0962HG4 Smardt chiller is about 8,500 pounds - and designed to be taken apart and easily reassembled. But, there is a freight elevator that goes right to the penthouse mechanical room. It’s a big reach - the crane would have to come in about 100 feet, then travel another 100 feet to the mechanical room doorway. “Professional Building 2 is sandwiched between Harrison Street, other professional buildings and rail lines in the Medical District,” says Carl Wigginton, vice president of service for Murphy & Miller, Inc., the Chicago-based HVAC contracting firm who handled the installation. By automatically matching capacity to the load, the compressor reduces its speed, which also reduces energy consumption.”īut all that efficiency wouldn’t do any good if the chiller didn’t fit into the mechanical room. The Danfoss Turbocor TT400 compressor can turn down capacity to 10 percent of its total capacity. Another energy-saving feature is the compressor’s ability to adjust automatically to off-design conditions. ”That’s partly because there are no oil-related heat transfer losses and no mechanical bearing friction losses. ![]() 57 percent more efficient,” Bullock says. ![]()
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