Dear OM users,

I'm trying to use the heat exchanger model IBPSA.Fluid.HeatExchangers.ConstantEffectiveness.
I put boundary conditions and flow sources in order to test it.
When I run the model, I get the error : Output parameter state was not assigned a value.

I'm looking for several days but I don't know how to fix it.

I attached the model file and put the code here :

Thanks for your help,
Yann (a beginner in OM)


echangeur-test01.mo

model echangeur_test01
  package Medium = IBPSA.Media.Water "Medium model";
  IBPSA.Fluid.Sources.Boundary_pT sou_1( redeclare package Medium = Medium, nPorts = 1, use_T_in = false) annotation(
    Placement(visible = true, transformation(extent = {{-92, -26}, {-72, -6}}, rotation = 0)));
  IBPSA.Fluid.Sources.MassFlowSource_T Circuit_EM(redeclare package Medium = Medium, T = 273.15 + 70, m_flow = +0.25, nPorts = 1, use_m_flow_in = false) annotation(
    Placement(visible = true, transformation(extent = {{88, -28}, {68, -8}}, rotation = 0)));
  IBPSA.Fluid.HeatExchangers.ConstantEffectiveness hex(dp1_nominal = 0, dp2_nominal = 0,eps = 0.5, m1_flow_nominal = 0.25, m2_flow_nominal = 0.1893)  annotation(
    Placement(visible = true, transformation(origin = {-7, -1}, extent = {{-21, -25}, {21, 25}}, rotation = 0)));
  IBPSA.Fluid.Sources.MassFlowSource_T Circuit_ES(T = 273.15 + 14.4, m_flow = 0.1893, nPorts = 1, use_m_flow_in = false) annotation(
    Placement(visible = true, transformation(origin = {-82, 14}, extent = {{-10, -10}, {10, 10}}, rotation = 0)));
  IBPSA.Fluid.Sources.Boundary_pT sou_2(nPorts = 1, use_T_in = false) annotation(
    Placement(visible = true, transformation(origin = {78, 14}, extent = {{10, -10}, {-10, 10}}, rotation = 0)));
equation
  connect(hex.port_a2, Circuit_EM.ports[1]) annotation(
    Line(points = {{14, -16}, {68, -16}, {68, -18}, {68, -18}}, color = {0, 127, 255}));
  connect(sou_1.ports[1], hex.port_b2) annotation(
    Line(points = {{-72, -16}, {-28, -16}}, color = {0, 127, 255}));
  connect(Circuit_ES.ports[1], hex.port_a1) annotation(
    Line(points = {{-72, 14}, {-28, 14}, {-28, 14}, {-28, 14}}, color = {0, 127, 255}));
  connect(hex.port_b1, sou_2.ports[1]) annotation(
    Line(points = {{14, 14}, {68, 14}, {68, 14}, {68, 14}}, color = {0, 127, 255}));
  annotation(
    experiment(StartTime = 0, StopTime = 3600, Tolerance = 1e-06, Interval = 7.2),
    uses(Modelica(version = "3.2.3"), IBPSA(version = "3.0.0")));
end echangeur_test01;