Variable-speed screw chiller

The York YVWA water-cooled screw chiller from Johnson Controls uses energy-saving variable-speed technology to help cut energy costs and carbon emissions by as much as 25%. The variable-speed drive saves energy during the 97% of operating hours at off-peak conditions, when building loads and/or water-tower temperatures are lower. As a result, these chillers deliver an integrated part-load valve as much as 30% better than traditional screw chillers.

The refrigerant is R134a, and the design of these chillers reduces the number of potential leak points by 35%. The falling-film evaporator reduces the number of potential leak points by as much as 30%.

These chillers can use a wide range of heat-rejection methods — including open cooling tower, dry cooler, adiabatic cooler, heat recovery or heat pump.

For more information on this story, click here: May 2012, 164
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