The concept:
As per the literature the two different strategies mentioned above are planned to employ at the same time. Additionally, the prototype is also to be designed with intention for evaluation of more conventional hydrogen storage materials like LaNi5 for its performance. Enhancing the thermal transfer of metal hydride beds during hydrogen absorption/desorption cycles are expected to achieve by incorporating additives to Mg based systems (improve thermal conductivity) and including internal/external heating/cooling (heat exchangers) systems. Further, stacking the powder bed for larger thickness is not recommended as it would induce pressure difference and add one more barrier of hydrogen diffusion through the stack to reach the bottom layer of the stack. Thus, to avoid this, different powder-bed units with limited thickness is proposed. As the storage tanks are intended to be use in portable applications, non-displacement of powder bed is highly desirable and therefore the covered powder-bed units with opening for hydrogen. This opening is secured with Ni-gasket to avoid escape of powder through the opening. As heat exchanger, the main gas and powder storing part is connected with axial and outer heat exchange units.
Schematic
of prototype tank.
