Green Roof Actual Evapotranspiration

Evapotranspiration rates determine green roof retention by dr.

Green roof actual evapotranspiration.

Little research has been completed on evapotranspiration et in green roofs. Retention is water captured by the green roof that only leaves as vapor through the process of evapotranspiration. Evapotranspiration is the process of water escaping as vapor. In order to fill the gap in this research topic this study carries out a review on the cooling effect due to the evapotranspiration process of green roofs.

When the subject of energy and green roofs comes up nearly everyone familiar with the topic will tell me that green roofs stay cool because of evapotranspiration. Anna zakrisson on sunday may 26 2019. Most of the analysed studies performed a comparison between green roof evapotranspiration plants substrate and bare soil evaporation only substrate. Sedum mexicanum mexican stonecrop and disphyma australe new zealand iceplant in a new zealand designed pumice and zeolite based substrate were analyzed to determine daily and hourly et rates under both water abundant and drought stressed conditions.

Retention and evapotranspiration are always the same volumes. In the literature available however it is still not clear how and how much the evapotranspiration affects the performance of a green roof. The plants in a green roof absorb water through their roots and then use surrounding heat from the air to evaporate the water while some roofs can reach temperatures of up to 90 f in the summertime these two features can allow. Green roofs reduce the temperature of the building and the surrounding air in multiple ways.