VSD Savings Calculator — Pump Affinity Law Tool
Pump motors running at fixed speed waste significant energy, especially during partial load conditions. The third affinity law states that pump power drops with the cube of speed reduction. Fitting a Variable Speed Drive (VSD also know as a Variable Frequency Drive or inverter) and integrating it correctly with your Building Management System (BMS) can cut costs, energy and carbon. This tool lets you model the savings at any speed, run hours and electricity rate.