Green Roof Actual Evapotranspiration

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 roof actual evapotranspiration.

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. Evapotranspiration is the process of water escaping as vapor. Retention is water captured by the green roof that only leaves as vapor through the process of evapotranspiration. Little research has been completed on evapotranspiration et in green roofs.

The actual solar radiation reaching the earth surface depends by the turbidity of the atmosphere and the presence of clouds which reflect and absorb a large percentage of the radiation. In the literature available however it is still not clear how and how much the evapotranspiration affects the performance of a green roof. Retention and evapotranspiration are always the same volumes. Most of the analysed studies performed a comparison between green roof evapotranspiration plants substrate and bare soil evaporation only substrate.

Evapotranspiration why even when discussing it with professional engineers doing building energy modeling they assume that most of the cooling ability of a green roof is through. Anna zakrisson on sunday may 26 2019. Evapotranspiration rates determine green roof retention by dr. 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.