Plant and Soil Evapotranspiration
As water transitions from a liquid to a gaseous state, it absorbs energy, causing the temperature of the atmosphere around foliage to drop.
Green roofs help improve environmental well-being.
The urban environment can be cooled by installing Green Roofs and Green Walls thanks to the combined evapotranspiration capacity of Plants and Soil.
EVAPOTRANSPIRATION (ET)
Through their roots, plants absorb water from the soil and carry it in liquid form to the foliage.
The water passes from a liquid to a gaseous state, diffusing into the atmosphere through stomatal openings. This phenomenon is referred to as transpiration (T). At the same time, the soil loses water by direct evaporation (E).
The sum of the amount of water lost by the soil through evaporation and by the plants through transpiration is called evapotranspiration (ET). The transition of water from a liquid to a gaseous state absorbs energy, causing the temperature in the atmosphere around the foliage to lower.
The surrounding environment is cooled thanks to the subtraction of the thermal energy required for its
conversion from the liquid state to the gaseous state (aqueous vapour). Water, which is present in the soil, evaporates in the atmosphere through the leaves of plants, while aqueous vapour, together with the energy absorbed, is dispersed.
