but
when you compare the volume requirements for the storage of heat
energy between water and phase change material like Glauber’s
salt, you will see that the water heat storage requires almost five
times amount of space as the Glauber’s salt heat storage, this space
savings would result in reduced costs for insulation and construction.
The applications of solar energy to heat the fluids can be used
to heat buildings, drying vegetables, fruits, meats, eggs incubation,
and other industrial purposes [58], the air heaters are classified
according to their applications and use as shown in Fig