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Modelica: Class not found in scope

I am trying to create my own GreenEnergy library in OpenModelica. I reproduced a similar structure of the library to Modelica Standard Library, but unfortunately receiving the next error:

...
[GreenEnergy.Validation.Wall: 5:3-5:312]: Class GreenEnergy.HeatTransfer.Components.Wall not found in scope GreenEnergy.Validation.Wall.
...

I have next file(and its content) structure:

GreenEnergy

  • package.mo

    within ;
package GreenEnergy
extends Modelica.Icons.Package;
end GreenEnergy;

  • HeatTransfer

    • package.mo
    within GreenEnergy;
package HeatTransfer
extends Modelica.Thermal.HeatTransfer;
end HeatTransfer;
    • Components
      • package.mo
      within GreenEnergy.HeatTransfer;
package Components
extends Modelica.Thermal.HeatTransfer.Components;
end Components;
      • Wall.mo
      within GreenEnergy.HeatTransfer.Components;

model Wall

import Modelica.Units.SI;
import Modelica.Thermal.HeatTransfer;

parameter SI.Area area = 1 "Wall area";
parameter SI.Length thickness = 0.5 "Thickness of wall";
parameter SI.Density density = 2000 "Wall density";
parameter SI.ThermalConductivity thermal_conductivity = 0.62 
"https://en.wikipedia.org/wiki/Thermal_conductivity";
parameter SI.SpecificHeatCapacity specific_heat_capacity = 800 
"Wall material specific heat capacity";
parameter SI.Temperature initial_temperature = 288.15 "Initial 
temperature of wall";

final constant SI.HeatCapacity heat_capacity = area * thickness * 
density * specific_heat_capacity;
final constant SI.CoefficientOfHeatTransfer 
coefficient_of_heat_transfer = thermal_conductivity * thickness;
final constant SI.ThermalConductance thermal_conductance = area * 
coefficient_of_heat_transfer;

HeatTransfer.Components.HeatCapacitor heatCapacitor(C = 
heat_capacity, T(displayUnit = "degC", fixed = true, start = 
initial_temperature)) annotation(Placement(visible = true, 
transformation(origin = {1, -33}, extent = {{-23, -23}, {23, 23}}, 
rotation = 180)));
HeatTransfer.Components.ThermalConductor thermalConductorOuter(G = 
thermal_conductance / 2) annotation(Placement(visible = true, 
transformation(origin = {-56, 0}, extent = {{-18, -18}, {18, 18}}, 
rotation = 0)));
HeatTransfer.Components.ThermalConductor thermalConductorInner(G = 
thermal_conductance / 2) annotation(Placement(visible = true, 
transformation(origin = {56, 0}, extent = {{-18, -18}, {18, 18}}, 
rotation = 0)));
HeatTransfer.Interfaces.HeatPort_a port_a 
annotation(Placement(visible = true, transformation(origin = 
{-100, 0}, extent = {{-10, -10}, {10, 10}}, rotation = 0), 
iconTransformation(origin = {-66, 0}, extent = {{-10, -10}, {10, 
10}}, rotation = 0)));
HeatTransfer.Interfaces.HeatPort_b port_b 
annotation(Placement(visible = true, transformation(origin = {100, 
0}, extent = {{-10, -10}, {10, 10}}, rotation = 0), 
iconTransformation(origin = {62, 0}, extent = {{-10, -10}, {10, 
10}}, rotation = 0)));
HeatTransfer.Celsius.TemperatureSensor temperatureSensor 
annotation(Placement(visible = true, transformation(origin = {58, 
52}, extent = {{-10, -10}, {10, 10}}, rotation = 0)));
Modelica.Blocks.Interfaces.RealOutput temperature 
annotation(Placement(visible = true, transformation(origin = {106, 
52}, extent = {{-10, -10}, {10, 10}}, rotation = 0), 
iconTransformation(origin = {0, -102}, extent = {{-10, -10}, {10, 
10}}, rotation = -90)));

equation

connect(thermalConductorOuter.port_b, heatCapacitor.port) 
annotation(Line(points = {{-38, 0}, {2, 0}, {2, -10}}, color = 
{191, 0, 0}, smooth = Smooth.Bezier));

connect(thermalConductorInner.port_a, heatCapacitor.port) 
annotation(Line(points = {{38, 0}, {2, 0}, {2, -10}}, color = 
{191, 0, 0}, smooth = Smooth.Bezier));

connect(port_a, thermalConductorOuter.port_a) 
annotation(Line(points = {{-100, 0}, {-74, 0}}, color = {191, 0, 
0}));

connect(thermalConductorInner.port_b, port_b) 
annotation(Line(points = {{74, 0}, {100, 0}}, color = {191, 0, 
0}));

connect(temperatureSensor.port, heatCapacitor.port) 
annotation(Line(points = {{48, 52}, {2, 52}, {2, -10}}, color = 
{191, 0, 0}, smooth = Smooth.Bezier));

connect(temperatureSensor.T, temperature) annotation(Line(points = 
{{68, 52}, {106, 52}}, color = {0, 0, 127}));
annotation(Icon(graphics = {Rectangle(origin = {-1.75, -0.54}, 
fillColor = {142, 142, 142}, fillPattern = FillPattern.Backward, 
extent = {{-63.75, 99.46}, {63.75, -99.46}}), Text(origin = {-3, 
83}, lineColor = {85, 0, 255}, extent = {{-59, 25}, {59, -25}}, 
textString = "%name"), Text(origin = {-15, -83}, lineColor = {170, 
0, 0}, extent = {{-13, 21}, {13, -21}}, textString = "T"), 
Text(origin = {-34, 2}, extent = {{-20, 12}, {20, -12}}, 
textString = "outer"), Text(origin = {29, 2}, extent = {{-27, 10}, 
{27, -10}}, textString = "inner"), Text(origin = {-2, 57}, extent 
= {{-60, 19}, {60, -19}}, textString = "C=%heat_capacity"), 
Text(origin = {22, 33}, extent = {{-84, 25}, {84, -25}}, 
textString = "G=%thermal_conductance")}));

end Wall;

  • Validation

    • package.mo
    within GreenEnergy;
package Validation
extends Modelica.Icons.ExamplesPackage;
end Validation;
    • Wall.mo
    within GreenEnergy.Validation;

model Wall

  extends Modelica.Icons.Example;

  GreenEnergy.HeatTransfer.Components.Wall wall1(area = 1, 
   density(displayUnit = "kg/m3") = 1, initial_temperature = 
   274.15, 
   specific_heat_capacity = 1, thermal_conductivity = 1, thickness 
   = 1)

   annotation(Placement(visible = true, transformation(origin = 
   {0, 0}, 
   extent = {{-45, -45}, {45, 45}}, rotation = 0)));

  //Modelica.Thermal.HeatTransfer.Sources.FixedTemperature 
  fixedTemperature(T = 283.15)  annotation(
  //Placement(visible = true, transformation(origin = {-76, 22}, 
  extent = {{-10, -10}, {10, 10}}, rotation = 0)));

  //Modelica.Thermal.HeatTransfer.Sources.FixedTemperature 
  fixedTemperature1(T = 303.15)  annotation(
  //Placement(visible = true, transformation(origin = {68, 22}, 
  extent 
  = {{-10, -10}, {10, 10}}, rotation = 180)));

  Modelica.Thermal.HeatTransfer.Sources.FixedTemperature 
  fixedTemperature annotation(Placement(visible = true, 
  transformation(origin = {-70, -0}, extent = {{-10, -10}, {10, 
  10}}, 
  rotation = 0)));

  Modelica.Thermal.HeatTransfer.Sources.FixedTemperature 
  fixedTemperature1 annotation(Placement(visible = true, 
  transformation(origin = {70, 0}, extent = {{-10, -10}, {10, 
  10}}, 
  rotation = -180)));

  equation

  connect(fixedTemperature.port, wall1.port_a) 
  annotation(Line(visible 
  = true, origin = {-44.85, -0}, points = {{-15.15, -0}, {15.15, 
  0}}, 
  color = {191, 0, 0}));

  connect(wall1.port_b, fixedTemperature1.port) 
  annotation(Line(visible = true, origin = {43.95, 0}, points = 
  {{-16.05, 0}, {16.05, 0}}, color = {191, 0, 0}));

  end Wall;

And then I am trying to run Validation.Wall model... So, why I am receiving error that component is not found in scope?

Best

Solution

  • The problem is in the next packages code:

    extends Modelica.Thermal.HeatTransfer;

    and

    extends Modelica.Thermal.HeatTransfer.Components;

    When I replaced those lines with the simpler line:

    extends Modelica.Icons.Package;

    Problem disappeared.

    Modelica.Thermal.HeatTransfer package contains those lines at the beginning:

    within Modelica.Thermal;

    but Modelica.Icons.Package is declared in a different way by using partial keyword. More details about partial keyword here.

    Best.