24-02-2016, 04:57 PM
A new compressor technology introduced during the 2003 International Air-Conditioning, Heating, Refrigerating Exposition (AHR Expo), held last January in Chicago, may have a significant
THE BEARINGS
Traditional centrifugal compressors use roller bearings and hydrodynamic bearings, both of
which consume power and require oil and a lubrication system. Recently, ceramic effect on the future of mid-range chillers and rooftop applications in water-cooled, evaporatively
By HUGH CROWTHER, PE,and EUGENE SMITHART, PE
roller bearings, which avoid issues related to oil and reduce power consumption, were introduced to the cooled, and air-cooled chilled-water and direct-expansion (DX) systems.
Designed and optimized to take full advantage of magnetic-bearing tech-HVAC industry. The lubrication of these bearings is provided by the refrigerant itself.The compressor was awarded the first AHR Expo Innovation Award in the energy category, as well as Canada’s Energy Efficiency Award for its potential to reduce utility-generated greenhouse-gas emissions. The compressor is key to a new water- cooled centrifugal-chiller design, with
Air-Conditioning and Refrigeration Institute (ARI) tests indicating inter Touchdown
bearings
Compressor cooling
Magnetic bearings and bearing sensors
Permanent-magnet synchronous motor
Shaft and impellers
Inlet-guide-vane assembly
grated part-load values (IPLVs) not normally seen with conventional chillers in this tonnage range. This article describes this new The TT300 compressor’s onboard digital electronics manage operation compressor technology and its first use while providing external control and Web-enabled access to a full array of in an ARI-certified chiller design.