What is the method for calculating a pump’s head? What conditions are needed to calculate it?
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What is the method for calculating a pump’s head? What conditions are needed to calculate it?
Usually, the selection of a pump begins after the process requirements such as head, flow rate, medium, temperature, and so on are specified; why has the original poster done it the other way around? Here is the answer to the original poster’s question: Formula: N (shaft power) = ρ (density) * g (acceleration due to gravity, taken as 9.8) * Q (flow rate) * H (head), in the International System of Units. As can be seen from the formula, to determine the head, it is necessary to know the shaft power N, the flow rate Q, and the density of the liquid ρ. The N-axis power can be calculated as 95% of the motor power. Above, I hope this will be helpful to the original poster; feel free to continue the discussion if you have any questions.
How is shaft power determined? ? ? Do we need to know the pump parameters first?
H=（P2-P1）/ρg+(v2-v1)2g+z2-z1, where p1 and p2 are the inlet and outlet pressures of the pump, V1 and V2 are the flow velocities of the liquid at the pump’s inlet and outlet, ρ is the density of the liquid, g is the acceleration due to gravity ≈9.8, and Z1 and Z2 are the heights of the inlet and outlet. I’m not sure if this is correct
Is the shaft power N, with/N shaft?
It dragged the original poster into the underworld. . .
The circulation pump represents the total water resistance in the pipeline, while the water pump corresponds to the pressure difference. If the pipeline is not particularly long, the water resistance in the pipeline can be ignored
The pump’s head is inherent to the pump itself, determined through performance tests, and not calculated by us. What can be calculated is the pipeline loss; there are calculation methods available online. Calculate the required head loss yourself, and by adding in parameters such as the desired flow rate and the medium, select a pump based on its performance curve.