At Lienig Wildfrucht GmbH in Zossen, a concept for a PV-supported refrigeration system, including the integration of liquid ice storage for thermal storage, has been implemented for a logistics warehouse comprising three temperature zones. As part of a current research project, extensive monitoring is being carried out, along with specific analyses of the liquid ice system and the optimisation of the forecast-based control system. This area of research offers a wide range of potential topics for student projects.

• Detailed analysis of measurement data: The data stored in a time-series database should preferably be processed in Python: determination of all heat fluxes and electrical power, calculation of key performance indicators, analysis of key performance indicators as a function of various plant states
• Dashboard: An initial dashboard has already been created based on the time-series database. So far, this has only included the display of measured variables and simplified relationships (averages, totals). To facilitate quick understanding, the aim is to further process the data directly within the dashboard in conjunction with the time-series database. The system uses the tools InfluxDB and Grafana for this purpose.
• Analysis of the liquid ice system: evaluation of pressure losses, heat transfer and the energy requirements of pumps and agitators under different load conditions
• Modelling / simulation: a plant model (Modelica/Dymola) developed during the concept phase is to be adapted to the actual implementation status and calibrated using measurement data. Subsequently, various concepts for forecast-based control can be investigated.

A thorough understanding of thermodynamics and refrigeration is essential for understanding the system (three different chillers/heat pumps, liquid ice system). Depending on the focus of the task, additional knowledge of Python, InfluxDB/Grafana and Modelica/Dymola would be an advantage. Working on this project will provide an opportunity to expand this knowledge significantly.

Since our internships and the supervision of student projects are primarily intended to provide practical experience and career guidance, we ask for your understanding that no compensation is provided. However, we would be happy to issue you a formal internship certificate and nominate your student project for the annual academic award presented by the Association for the Promotion of Air Conditioning and Refrigeration Technology (Verein zur Förderung der Luft- und Kältetechnik e.V.).