Hydrogen, weight

Seamless steel pressure vessels are the most common method in use today for hydrogen transportation at short distances (<200 km) and when small quantities are involved (up to about 500 kg). The different vessel options include cylinders, manifolded cylinder pallets and tube trailers. While single cylinders or manifolded pallets are trucked to the destination and off loaded, tube trailers, which consist of several steel cylinders mounted to a protective framework, are often left in place and replaced when empty. Transporting hydrogen in liquefied form is seven times more efficient in terms of actual hydrogen weight transported than using compressed gas cylinders. 

Hydrogen Weight Alloy Weight Fig. 5.7 Hydrogen absorption capacity of metal hydride alloy... 

To evaluate further the CAMD results, a number of atomic and chemical parameters from each structure (number of atoms, fractions of aromatic carbon and hydrogen, weight fraction or each atomic species, empirical formula) were compared with the original literature for each structure. This provided a useful check on the accuracy of the computer models. Results of the computer analyses for the four coal structures are given in Table I. The total numbers of atoms only appear as guides to the size and complexity of each structure, and bear no relationship to the size of a "coal molecule" or a decomposition product. 

Nitrogen, weight-percent Sul fur, weight-percent Carbon/hydrogen weight ratio Carbon residue, weight-percent Pour point, 0 F Viscosity at 100° F ... 

FIGURE 9.2 Trend of hydrogen weight fraction for various alanate compounds and cations as a function of the molecular weight of the compound. The trend is also representative of other complex hydrides, such as borohydrides. 

Hydrogen Weight and Volume Densities in Representative Borohydrides... 

Figure 1 Dependence of hydrogen weight increment on hydrogen pressure at room temperature in an autoclave filled with the commercial hypercrosslinked sorbents (1) MN-200, (2) MN-270, and (3) MN-500. (After [408].)...

A hydrogen balance over the reactor gives the hydrogen weight yield as... 

Fig. 11.22 Heat flow specific power of a hydrogen diffusion flame versus the hydrogen weight rate at various distances (L) from the flame longitudinal axis...

Fig. 11.23 Total heat flow specific power versus hydrogen weight rate...

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