Abstract :
The significant components of heat load in buildings are due to external wall that receives direct solar radiation and transfers the heat through conduction. The absorbed radiation elevates the outside surface temperature to a higher value than the outside air temperature which gradually shifts to lower indoor wall surfaces, increasing energy consumption. The physical characteristics of the wall, color, the material of the exterior surface, and the intensity of the sun radiation perpendicular to it, all affect the external surface temperature. Vertical greening is an emerging concept that comes in between the wall and direct solar radiation to block the direct solar radiation and reduce conductive heat transfer through the facade using vegetation. This paper elaborates on different vertical greening systems and their efficiency to keep away the direct solar radiation striking the building fabric.