Hydrogen Storage in High Compressed Gas Form

The compression in cylinders with a maximum pressure of 200 bar is a reliable well-established technology, today widely used for hydrogen and natural gas storage. Higher pressures permit the volumetric capability to be improved but not negligible power consumption has to be taken into account when high compression ratios are reached. 

The ideal compression (in isothermal conditions) work can be calculated according to the following equation  

Dynamic compressors, commercially used for natural gas compression, could be used in case of moderately high compression (p/p° up to 200-300), while alternative volumetric devices are necessary for higher pressure ratios. With respect to 

In order to match the safety issues, future pressure vessels include three layers an inner polymer liner, overwrapped with a high-strength and high-elasticity carbon fiber composite, and an outer layer of an aramid-material capable of withstanding mechanical and corrosion damage [107], 

Recent approaches aimed at improving the unsatisfactory gravimetric and volumetric capacities aie based on compressed cryogenic technique [110], In particular by cooling a tank to nitrogen liquefaction temperature (77 K) the volumetric capacity results three times higher with respect to conventional high pressure tank. 

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