Sun light plays a vital role in construction of building . The skin of the building performs the role of a filter between indoor and outdoor conditions, to control the intake or air, heat, cold, light, sounds and odors. It is agreed that air, temperature, wind, and sound are best controlled within the wall itself, while light is easier to control inside the building shell, and heat radiation is most efficiently halted before it reaches the building envelope proper. The materials of building skin plays a decisive part in the utilization and control of solar energy.
