Engineered Systems - June 2008 - (Page 62)

Time For A Transplant? of motor failure. In some cases, the energy savings potential is so high that replacing an existing, functional motor is financially justified. In the 1990’s, the DOE embarked on a study to determine the energy usage profile of industrial motor systems in the United States. It was discovered that approximately 23% of all U.S. electricity is consumed by motor driven systems that use 1- to 200-hp general-purpose motors. FIGURE 1. Life cycle cost of an industrial electric motor. (Figure courtesy of Baldor Electric Motors.) FIGURE 2. Comparison graph of U.S. motor efficiencies by hp. (Table courtesy of Emerson Motors.) Upwards of 85% of an p industrial facility’s electric s load is from motor systems, , and the DOE estimates that 23% of U.S. electricity is f S l consumed by these systems alone. Further estimates project potential savings of o g 11% to 18% in this sector (62 to 104 billion kWh per year) from motor system t ia optimization. Commercial office facilities typically see y l 20% to 25% of their electricity consumed by electric motors, and health care facilities, such as hospitals, are often 25% to 40% because of their high, almost 24/7/365 use of motor driven HVAC and air circulation equipment. In 2001, CEE and NEMA harmonized their respective efficiency standards to create NEMA Premium, which is codified by NEMA in MG 1 Table 12-12. NEMA Premium defines 1 to 500 hp, 2-4-6 pole, low-voltage <600V and 250 to 500 hp medium voltage, whereas EPAct 1992 only defined standards for 1 to 200 hp, 2-4-6 pole, TEFC and ODP, NEMA A and B design. Today, utility prescriptive motor programs are designed around the efficiency delta between EPAct efficiency levels and the corresponding NEMA Premium efficiency levels. ENERGY USAGE OVERVIEW Upwards of 85% of an industrial facility’s electric load is from motor systems and the DOE estimates that 23% of U.S. electricity is consumed by these systems alone. Further estimates project potential savings of 11% to 18% in this sector (62 to 104 billion kWh per year) from motor system optimization. Commercial office facilities typically see 20% to 25% of their electricity consumed by electric motors and health care facilities, such as hospitals, are often 25% to 40% because of their high, almost 24/7/365 use of motor driven HVAC and air circulation equipment. FIGURE 3. Graphical representation of New York State energy use. (Figure courtesy of the DOE, Energy Information Administration, and National Association of Manufacturers.) efficiency community to design a voluntary “premium efficiency” rating for EPAct-class motors that was above the EPAct efficiency levels. In 1996, the Consortium for Energy Efficiency (CEE) in cooperation with the DOE, the American Council for an Energy-Efficient Economy (ACEEE), numerous electric utilities, motor manufacturers, and other stakeholders developed a standard for premium efficient motors. Utility incentive programs provided the opportunity to encourage commercial and industrial customers to go beyond the mandated EPAct efficient motor to a premium efficient motor at time 62 En gi neer ed S y stem s June 2008

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Engineered Systems - June 2008 Contents Editor’s Note Letters To The Editor Back2Basics HVAC Challenge Case In Point Commissioning Efficiency Incentives HydroTech Building Automation Energy Wiz HVACR Designer Tips Notre Dame Tackles the Heat State Of The Arts Time For A Transplant? Project Delivery: What Can IPD Do For You? Issues & Events Computers & Software Products Application Checklist Glossary Classifieds Advertiser Index Tomorrow’s Engineer

Engineered Systems - June 2008

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