Does adding a VFD to a pump change the size and shape of the efficiency contours (or efficiency islands)?
Adding a VFD (Variable Frequency Drive) can change the size and shape of the efficiency contours, but not because the pump itself changes — it's because you're now operating that same pump at multiple speeds, and each speed has its own set of pump and efficiency curves.
Topics: system curve interaction, efficiency impact, pump curves, pump head
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