I was recently told that if the actual load on a pump motor were less than 50% of rated, there would be great potential for energy savings through the use of VFD’s. Is there a “rule of thumb” or an equation that would help predict savings by using VFD’s on synchronous pumps?
Is there a "rule of thumb" or a formula used to estimate energy savings (by implementing a VSD) based on motor loading?
I was given the following formula to calculate the predicted energy use with a VSD but it makes no sense to me (I have no idea where it came from)
Energy used =...
Does the efficiency of a pump change when the manufacturers pump curve is shifted upward as a result of a negative suction head? Ultimately I am trying to determine the predicted BHP of a pump operating at a given speed in order to predict the saving of implementing VSD.
