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Knowledge. Exchange. Applications.
On September 22 and 23, 2026, the fourth ThermoSim took place in Aachen – the expert conference on thermal system simulation with a focus on Modelica and FMI. The conference language was German, with optional English translation available.
ThermoSim 2026 brought together experts from industry and research working at the forefront of thermal system simulation.Over two days in the heart of Aachen, participants enjoyed practical, application-oriented presentations, in-depth discussions, and fresh ideas.The event provided an opportunity to connect with fellow professionals working with Modelica, FMI, and similar tools and models — people who understood their challenges, shared similar experiences, or had already found solutions.
The ThermoSim is the perfect opportunity to gain practical solutions, fresh perspectives, and valuable connections in thermal system simulation.
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. In September 2026, the conference took place in Aachen.
Practice over theory
The focus is on real industrial applications and practice-oriented research. Modelica, FMI, and modern simulation environments provide the technical framework.
Unique concentration of expertise
Offers a very high 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, and Modelon Impact — 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
„For me, ThermoSim is very valuable because it directly brings industry and research together. That’s where I met Steffen Heinke (TU Braunschweig) and our collaboration greatly advanced our ZEROe project."
Karin Dietl
Research Engineer
Airbus
„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
Exciting insights, a highly professional audience, and excellent networking opportunities. ThermoSim is a fixed date in my calendar, both as a speaker and as a participant.
Dr. Ing. Imke Krüger
Simulation Engineer
Dassault Systèmes
„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
“The majority of the ThermoSim presentations align exactly with my research interests and field of work. I very much look forward to being in Aachen and to taking away new impulses for my day-to-day work.”
Bernd Schäfer
Head of Simulation
Porsche AG
„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
The program combined expert presentations, interactive formats, and ample time for networking and getting to know each other. Our speakers came from leading industrial companies, engineering firms, and research institutions. The focus was on practical experience, real-world challenges, and immediately applicable insights.
Featuring contributions from, among others:
Danfoss · Bosch · Airbus · Porsche · Wurm · Dassault Systèmes · Modelon · AIT · DLR
Participants discussed their simulation model or a specific question in a personal 1:1 session with one of our experts by bringing a model, code or setup – if possible, directly on their laptop.
Ingo Frohböse
TLK-Thermo GmbH
15+ years of simulation experience – refrigeration cycles, automotive and stationary refrigeration systems, heat pumps, and cooling circuits
Focus areas
Dynamic and steady-state simulation of thermal systems. Modeling, conceptual design, system design, and optimization
Example questions
How do I model thermal systems using TIL in Dymola and Modelica?
How can I optimize the system model of a refrigeration system or heat pump in terms of both system design and simulation performance?
Matthias Schäfer
LTX Simulation GmbH
10+ years of simulation experience – Dymola & Modelica, Finite Element Method (FEM)
Focus areas
Dymola & Modelica: performance & numerics, workflows & automation
Example questions
Why is my model running so slowly?
How can I perform regression tests for my model development?
Manuel Gräber
TLK Energy
15+ years of modeling and simulation experience – Modelica, system simulation & Hardware-in-the-Loop (HiL) testing
Focus areas
System simulation: modeling strategies, controller development, Hardware-in-the-Loop, structured approaches to complex simulation problems
Example questions
My model works at the design point but becomes unstable or behaves strangely during transients – can you help me find out why?
I have several coupled control loops and can't get them to work robustly – how should I structure and tune the control concept?
Annika Kuhlmann & Jon Babst
XRG Simulation GmbH
15+ years of combined simulation experience – Modelica, system simulation & digital twins
Focus areas
Modelica: component and system modeling, building simulation, performance optimization & user support
Example questions
How do I turn a real system into a suitable simulation model?
How do I build robust system models with the right level of detail?
Short pitches on open real-world challenges, followed by discussion in small groups.
At the exhibition, attendees had the opportunity to explore the latest tools, libraries, and developments firsthand, connect directly with development teams, experience live demos, and discover new features.
Together with our co-organizers, TLK Energy hosted this year's ThermoSim in Aachen. All partners and sponsors were represented at the exhibition, showcasing their solutions to challenges in system simulation.
SPONSORS AND EXHIBITORS
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
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