Chapter 18: Variable Frequency Drive Evaluation Protocol

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Chapter 18: Variable Frequency Drive Evaluation Protocol The Uniform Methods Project: Methods for Determining Energy Efficiency Savings for Specific Measures Created as part of subcontract with period of performance September 2011 December 2014. Jeff Romberger SBW Consulting, Inc. Bellevue, Washington NREL Technical Monitor: Charles Kurnik NREL is a national laboratory of the Department of Energy Office of Energy Efficiency & Renewable Energy Operated by the Alliance for Sustainable Energy, LLC. This report is available at no cost from the National Renewable Energy Laboratory (NREL) at Subcontract Report NREL/SR-7A40-63166. November 2014. Contract No. DE-AC36-08GO28308. Chapter 18: Variable Frequency Drive Evaluation Protocol The Uniform Methods Project: Methods for Determining Energy Efficiency Savings for Specific Measures Created as part of subcontract with period of performance September 2011 December 2014.

the most common type of ASD hardware. With VFD speed control on a centrifugal fan or pump motor, energy use follows the affinity laws, which state that the motor electricity demand is a cubic relationship to speed under ideal conditions. Therefore, if the motor runs at 75% speed, the

  Centrifugal