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Thermal Power Library – Release 1.15

Release Notes for Thermal Power Library 1.15

Thermal Power Library 1.15 is part of Modelon’s 2017.2 release.

New versions of Modelon libraries are sold and distributed directly from Modelon, as well as approved resellers.

Version 1.15 of the ThermalPower library comes with several new features and improvement that will make the design process and user experience better. Highlights include automatic tuning of PID Controllers based on Asymmetric Relay Feedback, developed in collaboration with the Department of Automatic Control at Lund University, based on the latest research. The autotuner automizes the control design which helps both a user not so familiar with automatic control but also the expert who needs to improve an existing control design. Another highlight is models and templates for sizing of heat exchangers using dynamic models. Using dynamic models in the design process has the advantage that the same models can be used for the design case and in transient analysis which makes the modeling and verification process more efficient and ensure consistent result. Version 1.15 also comes with an indirect molten salt energy storage system including control logic for the charging and discharging mode. With this new addition, the user can analyze storage performance for different fluids, geometry configurations and test out control concepts. Another new feature is acid condensation checker for detection of sulfuric and hydrochloric acid in the flue-gas. It is used to verify design and operation conditions as condensation of acid can lead to serious corrosion problem. The new flue gas composition visualizers support displaying flow and composition in mass and mole based units, which makes it is easy to get an overview of the flow streams in the system. Other features include a flue-gas filter and a pipe with bends.

New features

  • PID control autotuner based on Assymetric Relay Feedback, developed in collaboration with the Department of Automatic Control at Lunds university based on the latest research. It automizes the control design and can be used to assist in setting up a controller or improve an existing control design.
  • Sizing of heat exchangers using dynamic models. It comes with new heat exchanger models and templates with example of a superheater and an economizer. The design manager supports various design modes such as specifying outlet temperatures and heat flow rate. There is also support for model reduction using a newly developed algorithm which enables the user to use a lower fidelity model for faster simulations.
  • Indirect thermal energy storage system consisting of two tanks connect via valves, pumps and a heat exchanger. It can be used as an energy storage component for e.g. thermal solar applications. It comes with an example with a control strategy for charging and discharging.
  • New pipe and friction models with bends. The new pipe can be used for design of long distribution pipes.
  • Flue-gas substance visualizers to show the flow composition in terms of mass and mole fractions. A user can conveniently switch between flow or fraction sensor types where both mass and mole based units are supported.
  • Flue-gas filters. With the filters, it is possible to filter away ash or other particles from the flue-gas stream.
  • Acid checker for condensation of sulfuric acid (H2SO4) and hydrochloric acid in the flue-gas. This component can be used to verify that the cooling of a flue-gas before its emitted to the atmosphere do not exceed the dew point of acid condensation. Acid condensation should be avoided as it can lead to serious corrosion problem.
  • Gas exhaust medium with hydrogen chloride species.
  • Support for aggregation of district heating customer loads.


  • Option to use a dynamic calculation of the heat transfer coefficient in ThermalPower.SubComponents.HeatTransfer.Pipes.KcEvap. For certain applications this will improve the simulation performance.

Fixed issues

  • Updated fan model to support zero speed.

Conversion of user libraries

No conversion from version 1.14 is needed.


Thermal Power Library 1.15 is based on Modelon Base Library 3.0 and Modelica Standard Library 3.2.2.

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