Energy storage is accomplished by devices or physical media that store some form of energy to perform some useful operation at a later time. A device that stores energy is sometimes called an accumulator (Figure 13.1).
Figure 13.1 District heating accumulation tower from Theiss near Krems an der Donau in Lower Austria with a thermal capacity of 2 GWh.
All forms of energy are either potential energy (e.g., chemical, gravitational, electrical energy, etc.) or kinetic energy (e.g., thermal energy) (Wagner 2007).
The general method and specific ...