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With the integration of the motor, VSD, and magnetic-bearing system, the capacitors required for the motor and drive can be used as a backup power source for the bearings in the event of a power outage or emergency shutdown.CAPACITY AND EFFICIENCYAmong the key parameters affecting performance are capacity (tons) and efficiency (kilowatts per ton). The compressor''s capacity ranges from 60 to 90 tons, depending on the operating conditions. Plans call for that range to be extended to 150 tons water-cooled and 115 tons air-cooled by the end of 2004 with the use of R-134a refrigerant. An R-22 version is planned for retrofit applications.Efficiency improvements stem from a combination of the centrifugal compressor, permanent-magnet motor, and magnetic bearings. Within the compressor, efficiency is affected by the compressor isentropic efficiency (the efficiency of the wheels), the motor, and the bearings. Traditional induction motors of this size typically are in the 92-percent efficiency range. This compressor''s permanent-magnet motor has an efficiency of 96 to 97 percent.

With donated and discounted building materials, and cash contributions from sponsors, Habitat helps families who need housing, and who commit to working shoulder-to-shoulder with community volunteers throughout the construction of their homes. In Tucson, Arizona, for example, single-parent families must agree to donate 200 hours of labor on the building or in the Habitat office; two-parent families must donate 400 hours of sweat equity, says Yvonne Coelet, Director of Public Relations.Houses are priced affordably and the families who move in are given zero-interest loans. The interest-free loans and community underwriting of the project through volunteer labor and donated materials means home payments for the new residents are typically much lower than the rent payments they were making previously. In Tucson, families living in rental units pay at least $.500 per month. In contrast, house payments for Habitat homes are typically about $350 per month. "With a house payment that''s significantly lower than rent," says Coelet, "families can get ahead in life."

There is no more versatile machine in the mobile equipment marketplace than the skid-steer loader. And with typical yearly sales in excess of 60,000 units, it''s clear that these machines, seen by many as the Swiss Army knife of construction machines, have penetrated a wide range of applications.But not all of them, in part because of the very nature of the beast.A skid-steer loader, as the name indicates, maneuvers by "skidding"--slowing or stopping the wheels on one side of the machine, while keeping the other side rolling. This system, highly valued because of its simplicity and effectiveness, particularly in tight spaces, does have drawbacks in some applications. When operated in grassy areas, skidding the tires can scuff up the turf, a real nono in venues such as parks or golf courses. Even where ground disturbance is not an issue, tire wear, or even wearing of the surface on which the machine operates, can sometimes cause problems.