Motors and Drives

Research Shows Copper Rotor Efficiencies for Motors

Motors using new die-cast copper rotors can reduce energy loss by 15 to 23 percent, compared with the current industry-standard motors using aluminum rotors, according to the Copper Development Association (CDA), New York.

Modifying Engine Exhaust for Savings

Electric and steam-turbine drives for chillers are common practice. However, the use of gas-engine-driven chillers, particularly in a high-rise city building, is unique.When it came to a chiller retrofit for the Time & Life building in Manhattan, this selection required an analysis of the gas-engine exhaust, noise and vibration potential and the cooling tower and riser capacity.

Variable Speed at Alliant Energy

Using the basic design concepts employed at Harley-Davidson University (see page 28), an enhanced version was developed for the Alliant Energy World Headquarters located in Madison, Wisconsin. This 320,000-square-foot building currently under construction is a working model for the efficient energy-management policy of this utility company.

Chicago Hotel’s New Cooling Tower Gets a Lift

Chicago’s Palmer House Hilton needed to replace its cooling tower and called on industrial and commercial HVAC firm Team Mechanical, Inc. (TMI) to aid with the purchasing and installation of the tower onto the roof of the 24-floor hotel. TMI worked with Maddock Industries to purchase the new $250,000, 112,000-lb.