seldom occur . So , resizing them can optimise energy efficiency without compromising performance or reliability . Consider the example of an HVAC motor : they are often specified to operate at maximum loads far exceeding average demands , such as being engineered to handle external temperatures of 40C , which may only occur a few days per year . With a drive it is possible to specify a smaller motor and then overspeed it to handle periods of peak demand .
Importantly , it is crucial to evaluate not just motor efficiency but the whole system . Using the HVAC example , this would include assessing fans , condensers and cooling towers in addition to the motors .
Uncovering global energy savings To demonstrate the true potential of energy audits in identifying energy savings , ABB conducted audits on more than 2,000 industrial motors across a wide range of sectors and applications in 2023 . The findings were remarkable : we identified potential energy savings of 31 % per motor if they were upgraded to more efficient technology . The highest savings typically came from motors operating without a variable speed drive ( VSD ). If the suggested upgrades from each audit were implemented , a return on investment ( ROI ) could be achieved in as little as three months , depending on the local cost of energy . global . abb 9