Operating power issue
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Question: Within the operating range of the pump’s design, if the pressure at the outlet is appropriately reduced, does the power consumption of the motor increase or decrease?
Could you explain the principle? Thank you
This is my personal understanding for reference only; as back pressure decreases, head and flow rate increase, with P=HQpg/3600
By reducing the outlet pressure, it can be seen from the performance curve that the flow rate increases; as the flow rate rises, the power also increases.
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Under normal circumstances, centrifugal pumps have a continuously downward performance curve, with the flow rate increasing as the head decreases. During operation, by reducing the back pressure of the pump, its operating point will shift passively along the characteristic curve toward a point with lower head and higher flow rate. Using the formula for calculating the shaft power of the pump (shaft power = flow rate × head × 9.81 × specific gravity of the fluid ÷ 3600 ÷ pump efficiency), it can be seen that the pump’s power will increase, and accordingly, the power consumption of the motor will also rise.