model VariableFlowPump
import SI = Modelica.SIunits;
extends HydraulicsByFluidon.Components.Pumps.Base.PartialPumpWithLeakage;
Modelica.Blocks.Interfaces.RealInput setpoint annotation (Placement(
visible = true,
transformation(
origin = {-100, 0},
extent = {
{-20, -20},
{20, 20}},
rotation = 0),
iconTransformation(
origin = {-80, 0},
extent = {
{-20, -20},
{20, 20}},
rotation = 0)));
Modelica.Blocks.Nonlinear.Limiter limiter(limitsAtInit = true, strict = true, uMin = 0, uMax = 1);
protected
Real flowFactor;
equation
actVolumeFlow = nominalVolumeFlow * flowFactor;
flowFactor = limiter.y;
limiter.u = setpoint;
annotation (
Icon(
coordinateSystem(initialScale = 0.1),
graphics = {
Line(points = {
{-80, -80},
{80, 80}}),
Polygon(
origin = {-33, 80},
rotation = -45,
fillPattern = FillPattern.Solid,
points = {
{80, 80},
{85, 60},
{75, 60},
{80, 80}})}),
Documentation(info = "<html> \n <p>\n The component VariableFlowPump constitutes a model of a flow source in which the\n delivery is calculated from the given nominal flow, the input signal, the leakage, and the suction pressure.\n </p>\n <p>\n <center><img src=\"modelica://HydraulicsByFluidon/Resources/Images/Components/Pumps/VariableFlowPumpIcon.png\"></center>\n </p>\n <p>\n Both internal and external leakage depend on the adjacent pressure difference.\n </p>\n <p>\n <center><img align=\"middle\" src=\"modelica://HydraulicsByFluidon/Resources/Images/Components/Pumps/VariableFlowPump.png\"></center>\n </p>\n <p>\n The parameter nominalVolumeFlow refers to the flow at Port A (suction side). \n </p>\n <p>\n The valid range of the input signal at port <i>setpoint</i> is 0 < signal < 1.\n Therefore 1 corresponds to 100 % of the nominal volume flow.\n </p>\n <p>\n <i>minSuctionPressure</i> takes into account that a pump requires a minimaum suction pressure for full flow. Below this pressure, \n the flow rate is reduced. In this model, the reduction is assumed to be simplified as a linear function of suction pressure in \n relation to <i>minSuctionPressure</i>.\n </p>\n <p>\n <center><img align=\"middle\" src=\"modelica://HydraulicsByFluidon/Resources/Images/Components/Pumps/PumpSuctionPressure.png\"></center>\n </p>\n <p>\n VariableFlowPump does not provide a model of the physical design of a pump but\n only copies its characteristic features. Thus, physical parameters (e. g. inertia\n moment or hydraulic-mechanical efficiency) are not parameterized.\n </p>\n </html>"));
end VariableFlowPump;