Variable Frequency Drives

Capital Investment Opportunity

Variable frequency drives (VFDs) adjust motor speed and torque by modulating the voltage and frequency. They are often used in HVAC fans and hydronic pump motors. VFDs can match the speed of the motor to the required load, therefore, saving energy during low demands.

Variable Frequency Drives

CONSIDERATIONS

  • Colder condenser water can often result in improved chiller efficiency.
  • Decreased cooling tower performance can result in excessive energy and water use.
  • Refurbishment is an option over full replacement and can result in significant electricity and water savings, at a fraction of the cost.
  • Effective towers will drastically improve waterside economizing capabilities (if applicable) leading to further energy savings.

KEY PERFORMANCE INDICATORS (KPIS)

  • 1-3 point energy use intensity (EUI) reduction potential
  • Up to 5% sitewide electric and water savings
  • 12 – 20 year simple payback

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