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Thermo engineering calculator how to#
In this example, we will see, how to predict Pump Head Calculation – Pump Performance Calculation This relationship is very complicated and its analysis lies in extensive hydraulic testing of certain centrifugal pump. The relationship between the pump head and the volumetric flow rate (Q), that a centrifugal pump can maintain, is dependent on various physical characteristics of the pump as: When a centrifugal pump is operating at a constant angular velocity, an increase in the system head (back pressure) on the flowing stream causes a reduction in the volumetric flow rate that the centrifugal pump can maintain. The head will also change as the volumetric flow rate through the pump is increased. The maximum pump head of a centrifugal pump is mainly determined by the outside diameter of the pump’s impeller and the shaft angular velocity – speed of the rotating shaft. In terms of pressure the pump head ( ΔP pump) is difference between system back pressure and the inlet pressure of the pump. The main reason for using head instead of pressure to determine the performance of a centrifugal pump is that the height of the fluid column is not dependent on the specific gravity (weight) of the liquid, while the pressure from a pump will change. The head and flow rate determine the performance of a pump, which is graphically shown in the figure as the performance curve or pump characteristic curve. Head is a measurement of the height of the incompressible fluid column the pump could create from the kinetic energy, that the pump gives to the liquid.
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In fluids dynamics the term pump head is used to measure the kinetic energy which a pump creates.