This example is identical to
Buildings.Fluid.Movers.Validation.PowerSimplified,
except that the efficiency of the flow controlled pumps
pump_dp and pump_m_flow
is estimated by using the Euler number and its correlation as implemented in
Buildings.Fluid.Movers.BaseClasses.Euler.
The figure below shows the approximation error for the power calculation where the speed y differs from the nominal speed ynominal.