Your sparring partner for system simulation

Virtual prototypes in record time

Complement your engineering team with our thermodynamics and simulation experts and proven software solutions.

Discuss your use case

Our clients

„TLK Energy helps us to accelerate innovations and boost our product/process performance as a global tier-1 supplier in the dynamic automotive sector. Computer aided engineering is a key to success for our new products in electrified mobility and the TLK team is doing a great job in supporting our simulations.”

Dr.-Ing. Moritz Lipperheide

Manager Thermal Systems, Kautex Textron

Your sparring partner for system simulation

System simulation is our daily business

Our team surrounding Dr.-Ing. Manuel Gräber and Dr.-Ing. Franz Lanzerath brings experience and best practices from many simulation projects. Thanks to our proximity to research, we are familiar with the latest methods and topics and incorporate them into our work.

This enables us to accompany our customers on the fastest path to virtual prototypes, reliably find errors and develop the best solutions.

Engineers in a work environment in their office

Know-how around test benches and measurements

We are not only home in the virtual world. We are also on the test bench and know the problems and challenges of the real world.

On request, we can set up individual test benches for you with our partner company TLK-Thermo and carry out measurements. The perfect complement for your virtual prototypes.

Industry-proven, open simulation software

For more than 15 years, our thermodynamics and simulation expertise has been incorporated into our Modelica library TIL, which has proven itself in countless industrial projects.

Our model code is openly comprehensible and can be individually extended and tailored to your needs.

Many interfaces for integrating the simulation models into your existing software environment (e.g. Matlab Simulink).

TIL Suite system model on a laptop

The first steps to system simulation with TLK Energy

Discuss your use case

Frequently asked questions from our customers

What rights do we receive to the source code created for the models?


You receive extensive rights of use and can also use the code we generate in the context of other partnerships and projects.

Does TLK Energy also work for competitors?


Yes, but of course confidentiality is important to us. Your information is safe with us. We will gladly conclude a confidentiality agreement with you.

What about ideas generated in the project?


All rights to inventions that arise in the project belong to you. We will be happy to support you with the patent application if necessary.

Our tools

TIL Suite

Our model library for thermal systems has proven itself in numerous industrial projects and has become a standard


Our powerful algorithm for solving optimisation problems for dynamic systems


The object-oriented, equation-based language is ideal for modelling complex, physical systems


For parameter variations, automated evaluations, optimisation calculations and interfaces to other tools

TLK Energy Apps

With our cloud platform, you simulate your models and visualise the results easily and quickly



Web-based simulator for hydrogen refueling stations

To support technical sales at NEUMAN & ESSER, we have developed a customized web-based application for the dynamic simulation of hydrogen refueling stations.

Customer requirements such as type and number of refueled vehicles can be selected. The filling station can be configured in detail and in a simulation the dynamic behavior of the overall system is calculated for a typical period of time.

With this tool, sales staff can configure the product "filling station" according to customer requirements without time-consuming detours via engineers. Interested parties receive direct and detailed feedback.

Hydrogen Refueling Station Simulation and Design Tool by NEUMAN & ESSER, Youtube video


Supermarket refrigeration CO2 cycle concepts

Emerson develops components and systems for supermarket refrigeration. Due to its environmental benefits CO2 as refrigerant is becoming more and more important in this sector. But compared to traditional refrigerants the thermodynamic properties of CO2 are totally different (high pressures and low critical temperature). Designing efficient CO2 cycles is challenging and there are many different cycle concepts proposed. Together with Emerson experts we have developed simulation models for a number of different concepts and run a simulation study to compare the seasonal efficiency of these cycles.

Eric Winandy et al.: Assessment of the seasonal efficiency of different CO2 booster architectures for different climates. DKV Jahrestagung, 2018


Heat pump modeling for HiL tests

In their development process of heat pump controllers Vaillant has established a comprehensive testing strategy. Before they connect developed controllers to real heat pumps in their lab, they are connected to virtual heat pumps running on special real time simulation hardware and software from dSPACE. Crucial ingredients for this so-called Hardware-in-the-Loop (HiL) tests are simulation models of the heat pumps, that are accurate, fast and robust. We developed these models for Vaillant using our Modelica library TIL Suite and set up a reliable tool chain to export these models to dSPACE platform. The models include a full dynamic physical model of the refrigeration cycle. It can handle switching of refrigerant flow direction caused by different modes for defrost, heating and cooling. Vaillant is now able to detect issues in control code much earlier and saves with this virtual testing a considerable amount of expensive lab experiments.

Manuel Gräber et al.: Physical Modeling of Heat Pumps for Hardware-in-the-Loop Testing. 13th International Modelica Conference, 2019


Battery thermal management

Together with Volkswagen we have developed simulation models for battery thermal management systems. Geometry of cooling plates and its flow patterns are taken into account by discretization with finite volumes. Compared to detailed CFD simulations the spatial resolution is much lower but still high enough to achieve confident results. This approach reduces the computation time dramatically enabling usage of numerical optimization algorithms or large-scale simulation studies. Cooling systems can be designed with less pressure loss and increased energy efficiency.

Robert Wendland et al.: Dynamic Optimization of Thermal Management and Cooling Plate Design for Battery Systems. 27th Aachen Colloquium Automobile and Engine Technology, 2018

Why system simulation with TLK Energy?

We look forward to your ideas!

Book a 30-minute meeting to get to know each other – and to discuss your use case. We will provide you with initial ideas and impulses straight away.

Discuss use case


Manuel Gräber

Managing Director


Franz Lanzerath

Managing Director