Kneeling in gratitude: The reason for excessive current when a magnetic pump is used to pump liquids with high density – are the calculation results reasonable?
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Using software, the flow rate was calculated to be 5 m3/h; the viscosity is similar to that of water, and the density is 1300 kg/m3. The pump has an inlet diameter of DN40 and an outlet diameter of DN25. The power calculation parameters for this pump are shown in the figure below. The software yielded a value of 1.6 KW for the power required, with a head of 28 meters. Based on these calculations, the effective power of the pump is 0.603 KW. The software also indicated that the motor power required is 1.6 KW, but in reality, our pump uses a 3 KW motor, which means the current consumption will be higher than specified. Please feel free to provide any guidance, as I would be extremely grateful. Good deeds bring good rewards – thank you very much!
Was the efficiency calculated incorrectly? Based on the formula N=density*head*flow/102, the shaft power is calculated to be 0.34 kW; since the motor has a capacity of 3 kW, the pump’s efficiency is only 11.3%?