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39 The following acronyms are defined in this document. Term Definition AC Alternating Current ANSI American National Standards Institute ASD Adjustable-Speed Drive ASME American Society of Mechanical Engineers CEO Chief Executive Officer CO2 Carbon Dioxide COO Chief Operating Officer DC Direct Current EERE Energy Efficiency and Renewable Energy GSA General Services Administration kVA Kilovolt-Ampere kWh Kilowatt-Hour LED Light Emitting Diode MEC Motor Efficiency Controller NASA National Aeronautics and Space Administration NPV Net Present Value PF Power Factor PWM Pulse Width Modulation ROI Return on Investment SCR Silicon-Controlled Rectifiers SI International System VFD Variable Frequency Drive VV Variable Voltage VVD Variable Voltage Drive VVVF Variable VoltageâVariable Frequency Acronyms
