Various tools for optimizing large scale magnesium hydride storage

Feasibility analysis of a novel solid-state H2 storage reactor concept based on thermochemical heat storage: MgH2 and Mg(OH)2 as reference materials

“…Marty et al [35] developed analytical expressions of loading times for various geometries of MgH2 reactor based on latent heat storage and a good agreement was obtained by comparing the calculated values to numerical and experimental results. Here, the same calculation approach is adapted to the MgH2 system based on thermochemical heat storage in order to evaluate its related hydrogen absorption time.…”

“…Before performing numerical and experimental studies to investigate the hydrogen loading process in this MgH2 reactor based on thermochemical heat storage, the development of an analytical expression of hydrogen absorption time is a good approach for evaluating the performance of the selected materials and directing research efforts for possible improvement of their properties. At the same time, it serves as preliminary calculation tool to optimize hydride and thermochemical materials thicknesses recognized as key design parameters [33][34][35].…”

“…As a result, these two zones saturate earlier than the rest of magnesium hydride and magnesium hydroxide beds where the respective equilibrium temperatures, Teq,abs and Teq,dehy are reached. Once the storage of absorption heat, Qabs is completed, the hydrogen storage media and heat storage media are characterized by their thicknesses, Mg and Mg(OH) 2 and the hydrogen absorption time can be expressed as [35]…”

Standardized hydrogen storage module with high utilization factor based on metal hydride-graphite composites

“…Due to their high operating temperature, these materials require a rather complex heat management based on a process integration [5] or e.g. the combination with a phase change material to preserve the associated thermal energy [6].…”

A tool for modelling the breathing of hydride powder in its container while cyclically absorbing and desorbing hydrogen

“…Existing geometries start from very simple containers where the hydride powder is simply poured in a cylinder [9] to very complex heat exchangers made of a very concentrated fins and tubes network, in order to add or take away calories [10,11]. The intricacy of the heat exchanger depends on how fast the tank has to be filled in or emptied with hydrogen, knowing that if a fast filling is desired, the thermal distances in the low thermal conductivity hydride material have to be decreased [12,13], which goes along with the addition of tubes, fins, wires, etc. which are increasing the global weight and volume of the tank.…”