How do I determine the power necessary to accelerate a pump to meet a specific change in demand?
The design is a VFD driving a constant torque positive displacement pump with a varying capacity load. The VFD will control pump speed thus met the flow demand. The steady state power is easily addressed. I need to assure that I can accelerate the pump from 50% load to 75% load in one second.
What are the specification parameters that will address this? I have talked with the suppliers of each of the components and none have a formula or procedure to determine this.
After determining this necessary properties, I need to include the these parameters into a dynamic model of the plant in Matlab.
I also need to determine how to bring the pump down in speed from 100% to 0% as fast as practical and know how fast that is. The load rejection does not occur often so regenerative braking is not necessary, a resistor is expected to be used.
I have looked at this from a dimension analysis view but I can't seem to find what the appropriate relationships are.