All mass fluxes are scaled by their respective lower heating values (NH3: 18.8 MJ kg-1, H2and LH2: 120 MJ kg-1). For these Sankey diagrams, “vector production loss” refers to the electrical energy required to run the vector production processes; “compression” refers to the energy required to run the compressors; “fugitive losses” and “parasitic losses” refer to direct hydrogen slip; “synthetic losses” refers to energetic loss from reaction thermochemistry; and “efficiency loss” refer to the energy required to operate the conversion processes. BOL in this context stands for boil-off-losses. For aesthetic purposes, any energy flows that were less than 0.1% of the demand signal are not shown in the Sankey diagram. The graph at the bottom shows the relative difference in energy between the NH3and LH2value chains at each stage: (ENH3−ELH2)/ELH2.
