motion guru
Diamond
- Joined
- Dec 8, 2003
- Location
- Yacolt, WA
Does anyone have a reference that can be used to estimate energy savings when applying VFDs to electric motors that would otherwise run 95% of the time completely unloaded?
I have an application where a 100HP motor runs 24x7x365 to pump fluid in a loop. A few times a day the fluid is diverted to a high elevation tank using about 90HP to make the elevation change and then when the tank is topped off, the fluid resumes its circulation route consuming only a few HP.
The nature of the application is such that we cannot stop circulation of the fluid. As such, the 100HP motor is running at a fraction of its load the vast majority of the time. As I understand it, an Induction motor running at partial load has a terrible power factor.
If I were to put a VFD in front of the motor, I could slow the motor down when in circulation mode to the minimum velocity required to keep the fluid mixed and then quickly ramp up during the time that pumping is needed.
My thought would be that the VFD has a close to 1.0 Power Factor and I could additionally reduce power consumption during the idle period.
I would like to find an energy savings document or online tool that helps me document what these energy savings might be . . . is anyone aware of a resource that could help me with this?
Thanks in advance . . .
I have an application where a 100HP motor runs 24x7x365 to pump fluid in a loop. A few times a day the fluid is diverted to a high elevation tank using about 90HP to make the elevation change and then when the tank is topped off, the fluid resumes its circulation route consuming only a few HP.
The nature of the application is such that we cannot stop circulation of the fluid. As such, the 100HP motor is running at a fraction of its load the vast majority of the time. As I understand it, an Induction motor running at partial load has a terrible power factor.
If I were to put a VFD in front of the motor, I could slow the motor down when in circulation mode to the minimum velocity required to keep the fluid mixed and then quickly ramp up during the time that pumping is needed.
My thought would be that the VFD has a close to 1.0 Power Factor and I could additionally reduce power consumption during the idle period.
I would like to find an energy savings document or online tool that helps me document what these energy savings might be . . . is anyone aware of a resource that could help me with this?
Thanks in advance . . .