Various types of energy storage techniques are reviewed and their performances in storing energy
compared in this study. Water storage systems required very large volume for large heat storage
capacities and corrosion problem for long operation periods. There is also stratification problem and
due to this controls are required. Scale formation is another problem with such systems.
With packed-bed storage there is no corrosion or scale forming problem but volume of the system
might increase with an increase in cost. On the other hand by the use of phase change storage
systems, large volumes required by the other two types are eliminated because of the bond interaction
of the storage material and the container, storage material loses its energy storage characteristics
after a period of time.