York centrifugal chillers have compressors with magnetic bearings

Published:  11 January, 2011

York, centrifugal chiller

The York YMC2 range of chillers from Johnson Controls use centrifugal compressors with magnetic bearings. The compressor is of the company’s own manufacture [not Turbocor in other words] and uses R134a. This magnetic-bearing technology has been used by Johnson Controls in naval applications for the past decade. These chillers are said to be 10% more efficient than conventional variable-speed chillers. Cooling capacities are from 750 to 1330 kW.

Other features of these chillers include improvements to the OptiSpeed drive. Evaporator efficiency has been improved with a ‘falling-film’ design, and advantage is taken of cooling-tower water at low temperature to save energy.

Noise at full load is 73 dB(A), which is claimed to be about 3 dB(A) less than other chillers with compressors having magnetic bearings.

For more information on this story, click here: January 2011, 162

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