Environmental Engineering Reference
In-Depth Information
Figure 22: Discharge time vs. power ratings for each storage technology [37].
Figure 23: Weight energy density vs. volume energy density for each technology [37].
with one another. However, the primary disadvantage is the poor effi ciencies
due to the number of conversion required between creating hydrogen and using
hydrogen. In contrast, the TESS increases the effi ciency of the overall energy
system. However a thermal energy system does not incorporate the transport
sector. As a result, EVs (the third energy system discussed) are often combined
with the TESS. Connolly et al. compared such a system with a hydrogen system
and found that the TESS/EV energy system only needs 85% of the fuel that a
HESS requires [37]. In addition, the TESS has already been implemented in
Denmark and thus is a much more mature solution that a hydrogen economy.
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