Thank you very much SKD,
The model runs well now.
Cyril

Hi SKD,
I think that you have well understand what I want to do. I fix the volume flow rate  (q=200) and the temperature (T=50°C) at the inlet Heat Exchanger with the connector A1. The exchanger is divided in n elements. For each element I implement law for q and T variations (q = constant) and a temperature difference of 1K (cooling effectively). I want to know the volume flow rate and the temperature at the outlet of the HX (connector A2).
My model works with potential (T) but fails when I introduce the flow q.
Thank you for your help.
Cyril

Hi
I have quiet the same problem with my modeling
Could you please help me solve this problem ?
Thanks a lot
Cyril


package Nodes
  connector FlowInlet
    Modelica.SIunits.Temperature T;
    flow Modelica.SIunits.VolumeFlowRate q;
  end FlowInlet;
  model HEXDuctSection
    FlowInlet Port1,Port2;
  equation
    Port1.q - Port2.q = 0;
    // non compressible fluid
    Port1.T - Port2.T = 1;
    // T diminution per element
  end HEXDuctSection;
  partial model HEXShell
    FlowInlet A1(T = 50, q = 200),A2;
    //Declaration of Inlet conditions
  end HEXShell;
  model HEXn
    extends HEXShell;
    parameter Integer n(start = 3);
    HEXDuctSection DuctA[n];
  equation
    connect(A1,DuctA[1].Port1);
    for i in 1:n - 1 loop
    connect(DuctA[i].Port2,DuctA[i + 1].Port1);

    end for;
    connect(DuctA[n].Port2,A2);
  end HEXn;
end Nodes;