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This article describes this new compressor technology and its first use in an ARI-certified chiller design.THE BEARINGSTraditional centrifugal compressors use roller bearings and hydrodynamic bearings, both of which consume power and require oil and a lubrication system. Recently, ceramic roller bearings, which avoid issues related to oil and reduce power consumption, were introduced to the HVAC industry. The lubrication 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 lubricated bearings. The frictionless compressor shaft is the compressor''s only moving component. It rotates on a levitated magnetic cushion (Figure 1). Magnetic bearings--two radial and one axial--hold the shaft in position (Figure 2). The other tool is called the Designated Driver -- but it''s not the kind who drives you home. This is a green aluminum screwdriver handle with four holes to accommodate the Magna-Tip drivers of your choice. It comes with five bits and an extension that can also be used with the handle for added leverage, but you can customize it for your special needs. It will take the place of several loose screwdrivers in the range bag. But not the loose screws in your shootin'' buddy''s head. When asked by the New York Times to write about the best tool invented in the past millennium, Witold Rybczynski was forced to reject an astonishing number of candidates, all invented before the year one A.D. Among them are the try square, plumb bob, measuring stick, handsaw, plane, chisel, and bow drill. Having built his own house from the ground up without benefit of electric tools, the author could simply tap his toolbox for ideas but, in the end, it was his wife who made the fruitful suggestion of the screwdriver.
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