TPL Version 4.0

Thermal Power Library 4.0 is part of Modelon's 2026.1 release. New versions of Modelon libraries are sold and distributed directly from Modelon, as well as approved resellers.

Version 4.0 contains the changes described below.

Improvements

  • Changes for improved simulation performance and robustness of two-phase fluids:
    • The wall sub-component in heat exchangers now has two temperature states per segment, reducing or removing the need for iterative solving of convection models. The previously used, single temperature state per segment can be brought back if needed by setting the "surfaceState" parameter on the wall sub-component to false.
    • All heat transfer correlations for two-phase fluids now have the option to filter or "relax" the heat transfer coefficients, which can improve simulation performance for transient scenarios. This option can be enabled either for single components by setting the useRelaxation parameter on the "Advanced" tab of correlation parameters, or for all components in a system by including the Modelon.ThermoFluid.Settings_TF component and enabling the useRelaxation parameter there. When enabled, the time constant of heat transfer coefficients can be determined by the parameter "tau". Values in the range of 1 to 10 seconds are recommended.
    • Minor changes to equations in the two-phase flow channel component that reduce risk of simulation slow-down. These changes only affect the transient behavior, not steady-state results.
  • In the parameter record for specifying the initial fluid state for two-phase fluids in all heat exchanger components, the following parameters have been renamed:
    • saturated_in was renamed to give_quality_in
    • saturated_out was renamed to give_quality_out

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