There are numerous technologies for storing solar energy in
various forms including mechanical, electrical and thermal energy
[9]. Thermal energy can be stored in well-insulated fluids or solids
as a change in internal energy of a material as sensible heat, latent
heat and thermo-chemical or combination of these. An overview of
major technique of storage of solar thermal energy is shown in
Fig. 1 [10]. In sensible heat storage (SHS), thermal energy is stored
by raising the temperature of a solid or liquid, utilizing the heat
capacity and change in temperature of the material during the
process of charging and discharging. The amount of heat stored
depends on the specific heat of the medium, the temperature
change and the amount of storage material. Generally water
appears to be the best SHS materials available because it is