SustainMV 2021

to learn more about hydrogen technology? At the Institute of Renewable Energy Systems (IRES) at Stralsund University of Applied Sciences, research on hydrogen technology has been going on for over 20 years. Here you can visit a wind/PV hydrogen cycle with a laboratory infrastructure of various applications on a pilot plant scale, which makes the technology tangible. From electrolysis to storage and power re-conversion via fuel cell systems - we show and explain hydrogen production and use as well as the current research questions. In addition to exciting experiments, there will also be the ThaiGer-H2 racing car to see. The hydrogen racing car is being built at Stralsund University of Applied Sciences since 2008 in the prototype category and has already been European champion in the Shell Eco Marathon 3 times! Curious about an online lab tour into the world of hydrogen and a chat with hydrogen expert Prof. Johannes Gulden? You are very welcome to participate and ask all your questions!
About the lab at IRES: The Institute of Renewable Energy Systems, founded by over 30 scientists, represents the joint commitment in applied research and practice-oriented teaching in the fields of renewable energy sources and hydrogen technology at the University of Stralsund.
The purpose of the Institute’s scientific work is interdisciplinary research, teaching, training and further education as well as technology transfer in the field of modern energy systems with a focus on:
• Use of renewable and alternative energy
• Energy conversion, storage and use
• Modelling and automation of related processes
• Economic and environmental aspects of such energy systems

Using two technologies that we have developed together with our students, we show how old bridges can be strengthened and how skyscrapers and wind turbines can be protected from earthquake loads and strong winds.
These methods are evaluated in terms of their economic, ecological and sociological effects and are compared with demolition and rebuilding the structure.

double-layer capacitors (12 x 48 V / 156 F modules) was set up in the laboratory at Stralsund University. A fluctuating power conversion is simulated by a 20 kW engine test bench with an asynchronous generator. The HESS uses the advantageous properties of both energy storage technologies. These enable the power flow at the grid connection point to be stabilized, from highly dynamic load peaks to longer-term power changes in the hourly range. A major advantage of this storage combination is the reduced cycle load of the lithium ion batteries due to the corresponding use of the double-layer capacitors. A design of the HESS components optimized for the respective work cycle, together with optimized operation, ensures an increased service life of the LIB.

make an important contribution in this regard. The positive ecological effects of avoiding, recycling and disposing of waste in an environmentally sound manner have been proven by numerous scientific studies. In Germany, the environmental service branch contributes significantly to resource and climate protection. For instance, it is the most successful sector with respect to reducing CO2 emissions as required by the Kyoto Agreement, i.e. compared to 1990. It should be noted that many positive effects are not even attributed to the waste management sector, but to energy or other industries to which the waste management sector provides secondary fuels and resources. However, self-criticism demands us to note that we, in Germany, are only at the beginning of a long road, regarding not only the “Energiewende” (“energy turnaround”), but also a "raw materials turnaround". We are still far away from a real circular economy, with secondary raw materials making up less than 15 % of industry input!

Smart Bioenergy - the tasks in the sustainable energy system and the bioeconomy of the future: Germany's energy supply must change to renewable energies (RE) within the next two decades and the supply of organic raw materials to industry must shift as far as possible from petro-based to bio-based materials. In order to achieve climate neutrality – which Germany aims to do by 2045 already –, consistent energy saving efforts and a complete conversion to RE are required and, in addition, negative emissions must be generated. The material and energetic coupling and cascading use of biogenic resources is a central element of a climate-neutral society, and especially carbon and nutrient cycles must be closed to this end. This ambitious goal of long-term integration of biomass into a sustainable energy and bioeconomy system can only be achieved if biomass is used efficiently, in an environmentally sound manner and with the highest possible economic benefit (smart bioenergy). Today, bioenergy already holds a special position in the energy system. In 2020, it accounted for around 20 % of gross electricity generation from renewable energies and almost 90 % of both renewable heat and renewable transport fuels.

before introducing combined PV/electrolyser systems. Finally, the lecture will take the audience to so-called photoelectrochemical cells, which directly turn photons into H2 molecules without the need of a separate electrolyser.