Is the circulating pump current related to the back pressure?
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Is the current of the circulation pump related to the back pressure? Is the increase in current due to rising back pressure caused by flow rate or head?
An increase in back pressure generally results in an increase in head, a decrease in flow rate, and a decrease in current
The back pressure of a water pump is the pressure exerted on the pump by the water column on the output side of the pump. Pumps have a head capacity, which means they can deliver water to a certain height. The water column at that height inevitably exerts pressure on the pump; when the height of the water column exceeds the pump’s head capacity, the back pressure will surpass the pump’s discharge pressure, preventing the pump from functioning.
An increase in back pressure is equivalent to an increase in pipe resistance, which leads to an increase in the current flowing through the motor.
According to the pump’s energy efficiency curve, as back pressure increases, flow rate decreases, and the current generally drops as well. It is relatively easy to increase the pressure of liquids.