Advanced Energy Efficiency, Lecture 2: Industry - Rocky Mountain ...
Advanced Energy Efficiency, Lecture 2: Industry - Rocky Mountain ...
Advanced Energy Efficiency, Lecture 2: Industry - Rocky Mountain ...
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Most induction-motor retrofits…<br />
◊ Use only two kinds of improvements<br />
<br />
“High-efficiency” motors instead of less efficient ones<br />
(but “high” efficiency isn’t good enough—only best-inclass<br />
efficiency is optimal, with very rare exceptions)<br />
Adjustable-speed drives (ASDs = VFDs = VSDs =<br />
inverter drives) in appropriate applications, which are<br />
more numerous than commonly supposed: ASDs can<br />
optimally trim pumps to run in their efficiency bull’s-eye<br />
as process needs shift, thus eliminating throttling<br />
valves—generally a good idea<br />
› Would you drive your car with the accelerator floored<br />
and control speed with the brake? What if the car<br />
were a cube-law device?<br />
◊ Both these measures are often worthwhile<br />
◊ They typically save ~15–20% of drive<br />
electricity, at costs of several ¢/saved kWh
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