.TAeZoSysPro.FluidDynamics.Components.Machines.BaseClasses.PumpCharacteristics.polynomialFlow

Information

polynomialFlow

This function computes the head in meter supplied by a pump at a given volume flow rate V_flow from a polynomial fitting of the pump curve.

The fitting is carried out from nominal inputs of the volume flow rate and the head (V_flow_nominal and head_nominal) via the least squares method. The order of the polynom that fits the curve is settable via the input OrderPolyFitting but cannot go over the third order.

  • If the input V_flow is out of the range of the input nominal data V_flow_nominal, a linear extrapolation is performed.

  • If V_flow <= 0 the head remains at head = f(V_flow = 0). This condition is prior to the bullet point above.

  • If the head computed by the polynom or by the extrapolation combined with the polynom goes bellow 0, the heat is threshold at 0 ( head ⩾ 0).

    Interface

    function polynomialFlow
  import Modelica.Math.Vectors;
  extends Modelica.Fluid.Machines.BaseClasses.PumpCharacteristics.baseFlow;
  input Modelica.SIunits.VolumeFlowRate V_flow_nominal[:] "Volume flow rate for N operating points (single pump)" annotation(
    Dialog);
  input Modelica.SIunits.Position head_nominal[:] "Pump head for N operating points" annotation(
    Dialog);
  input Integer OrderPolyFitting(max = 3) = 3 "Order of the polynom that fits the fan curve";
end polynomialFlow;
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