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During a media-effective ceremony on May 12th, 2022 at the event hotel Titanic on the Chausseestraße in Berlin, NOW GmbH together with German transport minister Volker Wissing cheerfully presented the funding decisions for the new HyStarter Regions and the participants in the second round of the HyExperts program (see also p. 18). A good two years before, Martin Thaler, as the representative from the city of Fulda, likewise stood onstage in Berlin to accept funding from the federal transport minister, then Andreas Scheuer. It was 300,000, an outcome from the first call for Hy-Expert Regions. What has happened in the meantime? What is special about Hydrogen Region Fulda? [ABSTRACT FROM AUTHOR]

Methane originating from biogas or natural gas is an attractive and environmentally friendly alternative to gasoline. Adsorption is seen as promising storage technology, but the heat released limits fast filling of these systems. Here a lab scale adsorptive methane storage tank, capable to study the temperature increase during fast filling, was realized. A variation of the filling time from 1 h to 31 s, showed a decrease of the storage capacity of 14% and temperature increase of 39.6 °C. The experimental data could be described in good accordance with a finite element simulation solving the transient mass, energy, and impulse balance. The simulation was further used to extrapolate temperature development in real sized car tanks and for different heat pipe scenarios, resulting in temperature rises of approximately 110 °C. It could be clearly shown, that with heat conductivity as solei mechanism the heat cannot be removed in acceptable time. By adding an outlet to the tank a feed flow cooling with methane as heat carrier was realized. This setup was proofed in simulation and lab scale experiments to be a promising technique for fast adsorbent cooling and can be crucial to leverage the full potential of adsorptive methane gas storage. [ABSTRACT FROM AUTHOR]