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Knowledge. Exchange. Applications.
On September 22 and 23, 2026, the fourth ThermoSim will take place in Aachen – the expert conference on thermal system simulation with a focus on Modelica and FMI. The conference language is German.
ThermoSim brings together experts from industry and research who are working at the forefront of thermal system simulation. Join us for two days of practical, application-oriented presentations, in-depth discussions, and fresh ideas — this year in the heart of Aachen. Meet people who work with Modelica, FMI, and similar tools and models like you do: people who understand your challenges, share them, or have already solved them. Please note that the conference will be held in German.
The perfect opportunity to gain practical solutions, fresh perspectives, and valuable connections in thermal system simulation.
Practice over theory
The focus is on real industrial applications — not only academic research. Modelica, FMI, and modern simulation environments provide the technical framework.
Unique concentration of expertise
Offers the highest concentration of expertise in thermal system simulation. Participants bring hands-on experience from energy, building, vehicle, and process simulation.
Direct dialogue with developers
Meet the teams behind tools and libraries such as TIL, Dymola, Modelon Impact, and Speedgoat — some of them with more than 25 years of experience in the field.
New formats in 2026
We’re planning even more genuine exchange!
1. Bring Your Challenge: Discuss visions and major challenges with fellow experts
2. Expert Clinic: One-on-one sessions focused on solving concrete simulation problems
Our speakers come from leading industrial companies, engineering consultancies, and research institutions. The focus is on practical experience, real-world challenges, and insights that can be applied immediately.
The final program with speakers and sessions will be announced.
Here you can find the ThermoSim 2024 program and the TLK Energy presentations.
„Once again, it was a very interesting meeting with in-depth discussions. A must-have event for all Modelica developers."
Simon Weber
Acoustics and Building Physics
University of Stuttgart
„A truly great mix: technically strong presentations combined with a relaxed and welcoming atmosphere."
Stefan Rauscher
Innovation Engineer Specialist
Vaillant Group
„At ThermoSim, I meet people who are working on exactly the same topics. The exchange is open, practical, and truly helps me move forward."
Sabrina Dusek
Research Engineer
AIT Austrian Institute of Technology
„For me, ThermoSim is particularly valuable because it brings industry and research together in a very direct way. Among other things, I made contact there with Steffen Heinke (TU Braunschweig) — and the resulting collaboration significantly advanced our ZEROe project."
Karin Dietl
Research Engineer
Airbus
„I’m looking forward to the technical exchange and to welcoming you as your host at some especially beautiful venues in Aachen."
Franz Lanzerath
CEO
TLK Energy
Modern conference rooms, a prime location, and short walking distances — just a few minutes from the cathedral and the market square.
A 100-year-old industrial building — now a vibrant venue for dining, meeting, and great conversations. The ideal setting for networking and personal exchange.
Food and drinks will be provided. Enjoy coffee and cake, snacks during the breaks, a lunch buffet from KochNische, and a shared dinner with cold drinks at La Fabrik.
Everyone with a passion for modeling and simulation is welcome.
ThermoSim is aimed at everyone who models, simulates, tests, or optimizes thermal systems:
Simulation engineers
R&D engineers
Model and tool developers
Engineering leads and
project managers
Modelica and FMI users
Engineering consultancies
Applied research institutions
The number of participants is limited to ensure high-quality exchange.
If you have any questions, please contact Lina Rosenthal (thermosim@tlk-energy.de) .
ThermoSim takes place every two years and is hosted in rotation by TLK-Thermo, LTX Simulation, XRG Simulation, and TLK Energy. It brings together experts from industry and research in the field of system simulation.
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