VFDs to the Rescue

Mazzoni, Steve
December 2006
Heating/Piping/Air Conditioning Engineering;Dec2006, Vol. 78 Issue 12, p17
The article discusses how variable-frequency drives (VFDs) helped the author in taking initial field readings on a chilled-water plant expansion project. To confirm head and flow rates met design criteria, they need to examine 16 pumps, which are all controlled by VFDs. He remembered that the VFDs allowed them to slow the pumps to match the pump curve and in some cases, helped confirm impeller size.


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