4 Product Manual PM WSC/WDC
Design Advantages
Dual Compressor Design
Dual Compressor Chillers Offer Better Efficiency, Lower Installed Costs, Less
Floor Space, And Higher Reliability Than Single Compressor Designs
Note: Building part load data directly from a major manufacturer’s load and energy program
Most buildings operate at their full design cooling load for only a few hours a year, yes, hours. In fact some
buildings, schools for example, may never run at full design load. Except for some electrical demand
considerations, why be concerned about a chiller’s full load kW/ton (COP) at all? The real question should be
"what does it cost to run the chiller in my building, at my loads, and my power costs?"
The answer to this question is in the part load efficiency of the chiller-and no chiller can do as well as the
McQuay Dual Centrifugal. These chillers excel when it comes to operating efficiency in the five percent to sixty
percent capacity range-where 70 percent of the annual operating occur in most buildings. The building part
load curves shown above are from detailed energy studies performed on various building types.
See page 15 for a comprehensive discussion of dual compressor advantages.
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