Systems Engineering

Hot, cold, chemical reaction? With systems engineering you're always right.

We are experts for thermal, process and energy systems ‒ experienced in modelling and simulation of various technologies like heat pumps, cooling circuits, chemical reactors and batteries.

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Model based systems engineering

We support you with our knowledge and experience in system simulation, thermodynamics, control theory and mathematical optimization to solve demanding tasks and improve your products, processes, and systems.

Abstrakte Darstellung eines Modells


We build a digital twin of your system so you can investigate and predict its behavior much easier (and much cheaper) than in reality.


It’s always good to backup the simulations with real measurement data. We build up and operate test stands accordingly to your specific demands.


We help you to develop robust and efficient controls for your system. Starting from basic concepts up to Hardware-in-the-Loop testing.


We use simulation, mathematical algorithms and engineering knowledge to increase the energy efficiency of complex production plants.

For our engineering services we use the best tools...

...and if we couldn't find one, we made it ourselves.

TIL Suite

Our model library for thermal systems


High-performance optimization algorithm


Object-oriented, multi-domain modeling language


Multi-purpose, high-level programming language

TLK Energy Apps

Cloud simulation platform



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

Digital Engineering delivers results you can work with.

Whether you are looking for sophisticated models, ready-to-use simulators, or turnkey reports, you will get the results you really need for your business.

Ready for a new project?

Call us at +49 241 412 50 645, e-mail us to or find us on LinkedIn.