Efficiency is further enhanced with the use of magnetic bearings, which avoid fire friction of rubbing parts associated gas power air compressors with traditional oiled bearings. conventional bearings can use as much as 10,000 w, while magnetic bearings power require only 180 w. that amounts to 500 times less friction loss. current development projects are expanding the range and duty of the compressor wheels and promise to offer even greater efficiency for water-cooled and air-cooled duties and different capacities.controlsthe new compressor effectively is a computer. it provides air and compressors diagnostic and performance information through modbus to the refrigeration system, which then communicates to gas power air compressors the building automation system through modbus, lonworks, or bacnet.chiller applicationthe compressor manufacturer and a major chiller power manufacturer teamed up to develop air a line of ari-certified water-cooled chillers, which were compressors expected to be introduced in january 2004. the combination of flooded-evaporator technology and an oil-free system has allowed very close approaches and, subsequently, enhanced performance. the integrated vfd allows excellent part-load performance gas power air compressors as power consumption drops off, depending on the head relief, power near the cube root of air the shaft speed.

this article describes this new compressor technology compressors and its first use in an ari-certified chiller design.the bearingstraditional centrifugal compressors gas use roller bearings and hydrodynamic bearings, both of which consume power and power require oil and a lubrication system. air recently, ceramic roller bearings, which avoid issues related to oil and reduce power consumption, were introduced to the hvac industry. the lubrication compressors of these bearings is provided by the refrigerant itself. (1)magnetic-bearing technology is significantly different. a digitally controlled magnetic-bearing system, consisting of both permanent magnets and electromagnets, replaces conventional gas lubricated bearings. the frictionless compressor shaft is the compressor''s power only moving component. air it rotates on a levitated magnetic cushion (figure 1). magnetic bearings--two radial and one axial--hold the shaft compressors in position (figure 2).

the use of permanent magnets instead of rotor windings makes the motor smaller and lighter than induction motors. using gas magnetic-bearing technology, a 75-ton compressor weighs 265 lb--about power one-fifth the weight of a conventional compressor.a air variable-speed drive (vsd) is required for the motor to operate. the vsd varies the frequency between compressors 300 and 800 hz, which provides a compressor-speed range from 18,000 to 48,000 rpm. this avoids a gear gas set. the vsd is integrated into the compressor housing, avoiding long leads and allowing key electronic components to be refrigerant-cooled. power the vsd also acts as a soft starter; air as a compressors result, the compressor has an extremely low startup in-rush current: less than 2 amps, compared with 500 to 600 amps for a traditional 75-ton, 460-v screw compressor with a cross-the-line starter.

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