Green Facade Cooling: Evapotranspiration vs a Bare Wall

What Green Facade Cooling Is

Green facade cooling refers to the process where living plants are used as a natural cooling mechanism for buildings. This technique leverages evapotranspiration, which is the combined process of evaporation from soil and transpiration through plant stomata, to reduce surface temperatures.

In contrast, bare masonry walls rely solely on passive cooling methods such as radiation and convection to lower their temperature.

How Evapotranspiration Works

Evapotranspiration is a key component of the water cycle. Plants absorb water through their roots, which then travels up to the leaves where it evaporates into the atmosphere. This process not only cools the plant but also the surrounding air and surfaces.

The rate of evapotranspiration depends on factors such as solar radiation, leaf density (which affects stomatal opening), soil moisture content, and wind speed.

Why It Matters

Green facades can significantly reduce the urban heat island effect by lowering surface temperatures of buildings. This not only improves thermal comfort but also reduces energy consumption for air conditioning.

Moreover, green facades enhance biodiversity and improve air quality through increased plant cover.

Real-World Applications

Green facades are increasingly being used in urban architecture to mitigate the effects of climate change. They can be found on buildings in cities around the world, from residential complexes to commercial structures.

Studies have shown that green facades can reduce surface temperatures by up to 10°C compared to bare walls, leading to substantial energy savings and improved microclimate conditions.

Frequently asked questions

Try it live

Everything above runs in your browser — open Green Facade Cooling: Evapotranspiration vs a Bare Wall and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.