.Annex60.Fluid.Movers.Validation.PowerSimplified

Information

This example compares the power consumed by pumps that take three different control signals. Each pump has identical mass flow rate and pressure rise.

Note that for the instances Annex60.Fluid.Movers.FlowControlled_dp and Annex60.Fluid.Movers.FlowControlled_m_flow, we had to assign the efficiencies (otherwise the default constant efficiency of 0.7 would have been used). In these models, the power consumption is computed using similarity laws, but using the mass flow rate as opposed to the speed, because speed is not known in these two models. This is an approximation at operating points in which the speed is different from the nominal speed N_nominal because similarity laws are valid for speed and not for mass flow rate.

The figure below shows the approximation error for the power calculation where the speed Nrpm differs from the nominal speed Nnominal.

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