This is a simple validation model for
Buildings.Fluid.Movers.BaseClasses.FlowMachineInterface
where its motor efficiency ηmot is specified with
different methods defined in
Buildings.Fluid.Movers.BaseClasses.Types.MotorEfficiencyMethod.
The instance eff4 specifies ηmot as
a function of motor PLR by finding a generic curve with the maximum motor
efficiency and rated motor input power. The generic curve is generated by
Buildings.Fluid.Movers.BaseClasses.Characteristics.motorEfficiencyCurve.