Is it efficient to interchange associate recent, however operable, motor with a brand new, economical motor?
For Sacred Heart heart, the short answer is "yes."
Eugene Water & electrical Board's preliminary analysis shows that NEMA PremiumTM motors may probably improve motor-driven system efficiencies by 3 to seven p.c, saving customers cash on electrical bills and up their system dependability.
"We had little doubt there would be energy savings," says Greg Kelleher, associate EWEB Energy Management Services engineer. "The real question was: wherever would motor replacements be cost-effective?"
To answer this question, EWEB required an oversized industrial or industrial client to pilot the program. Tom Maria Magdalene von Losch, the Energy Management organizer at Sacred Heart heart, stepped up to the plate. "We knew concerning the potential for energy savings with new, high potency motors, therefore once EWEB asked U.S.A., we have a tendency to were happy to participate."
Initially, Maria Magdalene von Losch designated 13 recent fan and pump motors that had high operational hours. Maria Magdalene von Losch and Kelleher collected information from the plate of every motor. They additionally measured power use, motor speeds, fan and pump speeds, and machine sizes related to every motor-fan and motor-pump combination. They used this information, in conjunction with quotes for brand new NEMA PremiumTM motors, to predict savings and payback from the initial investment.
Tom Maria Magdalene von Losch, Energy Management organizer at Sacred Heart heart Tom Maria Magdalene von Losch, Energy Management organizer at Sacred Heart heart, shows off a number of the motors they recently replaced.
With EWEB money incentives and supported the number of energy savings, the payback for Sacred Heart was but one year. supported the savings and social science, the medical facility set it had been worthy to interchange the motors.
Sacred Heart suddenly met a couple of problems on the method. Matching frame sizes and mounting new motors on recent mounting plates was difficult for a couple of of the motors, however Maria Magdalene von Losch and also the facilities crew at Sacred Heart were ready to create the modifications.
The biggest issue was revolutions per minute (RPM). Newer, a lot of economical motors sometimes run slightly quicker than older motors. For fans and centrifugal pumps, power use will increase with (approximately) the cube of the rate. this suggests that a friend running as very little as 2 p.c quicker needs six p.c a lot of power, wiping out abundant of the savings anticipated from a brand new, a lot of economical motor.
Dietrich detected this issue at once. "We replaced one fan motor with another that was 5 p.c a lot of economical, however since the fan was running quicker, we have a tendency to were truly victimisation a lot of power than before and moving a lot of air than we would have liked to."
Running fans quicker or slower than designed will disturb building air balance. as an example, it will interfere with however doors operate and have an effect on rooms purposely maintained below negative pressure. Sacred Heart resolved this downside by ever-changing the sizes of the pulleys, or sheaves, on the fans and motors. This keeps the fans turning at their original speeds.
The pumps were direct-driven, therefore it had been insufferable to correct their speeds by ever-changing sheaves. Variable frequency drives, eddy current drives, and gearboxes failed to seem to be efficient for these pumps. another choice was to permit the motor to run slightly quicker, then address rate at the pump either by limiting flow or by ever-changing or trimming the pump's impellers.
Dietrich and Kelleher set to depart the pumps alone for currently, and follow the belt-driven motors as a result of there have been numerous to decide on from and ever-changing sheaves was comparatively simple and cheap, concerning $200 per motor-fan combination. They arrange to address motor-pump combos later by analyzing whole pumping systems for potential savings instead of merely the motor.
The project remains a piece current, however savings are higher than anticipated. The new motors square measure saving quite 5 p.c in energy and demand, leading to savings of just about $2,500 per annum. If EWEB incentives square measure enclosed, the easy payback is around six months.
EWEB hopes to unveil the utility's "Motor Replacement Program" early next year. associate EWEB Energy Services specialist can examine your motor-driven systems and assist you decide that motors in your facility add up to interchange. different potency enhancements will usually be created at a similar time as a motor replacement.
The most efficient replacements square measure motors over twenty years recent that operate quite half-dozen,000 hours per annum.
Call Greg Kelleher at (541) 685-7000 for a lot of data concerning motor replacements in your facility.