Compressed hydrogen density

The trailer transport of compressed hydrogen is - because of the low energy density of gaseous hydrogen - only an economic alternative for the distribution of small quantities and short distances (such as during the early phase of hydrogen penetration) and can, therefore, be excluded as an option for the area-wide implementation of a supply infrastructure in a later phase. 

Figure 5.5 Volumetric density of compressed hydrogen gas as a function of gas pressure including the ideal gas and liquid hydrogen. The ratio of the wall thickness to the outer diameter of the pressure cylinder is shown on the right-hand side for steel with a tensile strength of 460 MPa. A schematic drawing of the pressure cylinder is shown as an inset.

Figure 5.11 Hydrogen density for compressed hydrogen, liquid and solid hydrogen.

NOTES Energy densities are based on total storage system volume or mass. Energy densities for compressed hydrogen are at pressures of 10,000 psi. SOURCES DOE (2002b, 2003b). 

Carbon reinforced epoxy resin container for compressed hydrogen storage Low-density polyethylene 0.5 16... 

SCF and the solubility of the solid in the SCF. Therefore, the isothermal solubility curves deviate from linearity as the SCF approaches a highly compressed constant density, at which point the solid solubility reaches a limiting value. The solubility curves also deviate from linearity as the UCEP for the solid-SCF mixture is approached. This deviation from linearity near the system UCEP is clearly shown in the work of Schmitt and Reid (1984) for the naphthalene-ethylene system. Finally, the solubility curves will deviate from linearity if there are specific solute-solvent interactions, such as acid-base interactions or hydrogen bonding (Schmitt, 1984). 

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