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Release Notes for Thermal Power Library 1.17

Thermal Power Library 1.17 is part of Modelon’s 2018.2 release. New versions of Modelon’s libraries are sold and distributed directly from Modelon, as well as approved resellers.

With version 1.17, the Thermal Power Library has extended its capabilities for simulation of combustion processes. There are several new fuel components which make it easy to quickly set-up and analyze combustion processes. There are also new improvements for simulation of district heating networks. With the new dynamic pressure loss model, district heating networks with loops are handled better numerically which make it possible to simulate larger and more complex systems.

Highlights from this release include a new combustor model targeting biomass and fossil fuels that is capable of handling arbitrary hydro carbons mixtures, a solid substance visualizer showing mass and mole fractions which help the user to quickly get an overview of the system, heating value predictions from wet or dry compositions, a fuel source that support CHONS elementary compositions specified as wet, dry or ash-free and a new solid interface that makes it possible to create a mixture using flow sources.

Version 1.17 contains the changes described below.

New features

  • New combustor model, it can handle arbitrary hydro carbons and is suitable to be used for fossil fuels and biomass. It comes with a flexible reaction object and contains a mass and elementary conservation checker and the option to use lower or higher heating value (LHV or HHV) as input.
  • Dynamic pressure loss model for modeling of district heating networks with loops in an efficient and user-friendly way.
  • New fuel source with a replaceable composition record that makes it easy to specify the CHONS elementary composition and the moisture and ash content.
  • Fuel mixer that mix incoming fuel streams.
  • Solid substance visualizers that show flow composition in terms of mass and mole fractions. A user can switch between flow or fraction sensor types where both mass and mole-based units are supported.
  • Heating value calculator. It predicts heating values from the elementary composition using the Milne formula and calculates the values for the wet, moisture and ash-free and moisture free variants.
  • Composition converter that convert and calculate composition as received (wet), moisture and ash-free and ash moisture free. This is useful when calculating heating values as the input composition usually is defined as one of these variants.
  • A new mass and elementary conservation checker to ensure that conservation laws are fulfilled in combustion processes.
  • Several combustor benchmark examples have been added with visualizers showing performance variables where a user quickly can get an overview of the performance.
  • Lignite medium that uses the Dulong formula to predict the heating value based on the elementary composition.
  • Generic CHONS medium that uses the Dulong formula to predict the heating value based on the elementary composition.
  • Multi-category mixture template that makes it possible to quickly set-up a mixture of two media.


  • Extended solid connector interface to better support moisture and mixtures.
  • Extended solid media interface. It contains new functions such as specificEnthalpy_dry and specificHeatCapacity_dry.
  • Improved accuracy of dynamic delay district heating pipes by including thermal inertia of the pipe material in the model.
  • Increased complexity of the district heating network example.

Conversion of user libraries

Automatic conversion of user libraries from version 1.16 is supported using the included conversion script convertTPL_1.16_to_1.17.mos located under ThermalPowerResourcesScripts.


Thermal Power Library 1.17 is based on Modelon Base Library 3.2 and Modelica Standard Library 3.2.2.

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