Quote:
Originally posted by myv65
Another thing that comes into play with submerged pumps like your example is the motor behavior. A split capacitor, single phase, four-pole motor will have a peak efficiency in the range of 65%. The efficiency curve looks like a parabola. So as you move away from the "full rated load", the efficiency will drop off dramatically. A dead head condition will tend to drop the motor output load, but will also bump the motor some along its efficiency curve. I have done absolutely zero work in this area to measure the effects, so I can't say positively how significant this is. All I would point out is that energy input to the motor does not drop as rapidly as the shaft output power drops due to the efficiency curve of the motor.
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Now I'm beginning to understand why pump curves aren't straight! Thanks "uncle" Dave!