Techno-economic assessment of physical-based hydrogen storage technologies: An efficient refrigeration management

Resumen

The physical-based storage of hydrogen as a compressed gas or as a liquid has many advantages over material-based methods that may require advanced storage materials, and different charge/discharge rates. However, its high energy demand is an important issue that needs to be addressed. The aim of this work was to evaluate the techno-economic performance indices in terms of energy density and SEC of CCH2  over conventional LH2 and CGH2 storage under convenient state conditions. The results reveals that under CCH2 storage conditions, a higher hydrogen density of≈ 90 kg/m3 was obtained at 53 K and 700 bar, with an SEC value of  39 kWh/kg. For LH2 ≈ 71kg/m3 at 3 bar and 20 K with a SEC of 45 kWh/kg and CGH2 ≈ 40.5 kg/m3 at 700 bar and 300 K with a SEC of 35.5 kWh/kg. The hydrogen storage density could be doubled from 40 kg/m3 at 700 bar and 300 K using CGH2 to 80 kg/m3 at ≈ 38 K using CCH2, but with only 300 bar. Hence, these optimal points could be viable options for the demand of different applications, such as hydrogen-refueling stations, and for long transport with a certain tradeoff between SEC and energy density.