Authors: M. Haggag, A. Hassan
The use of vegetated walls and intensive plantation around buildings has increased in popularity s due to its proven success in lowering the heat-island effect in the urban context and its contribution towards achieving high comfort levels in spaces. This paper examines the introduction of plant-shaded walls as passive technique to reduce heat gain in indoor spaces as a strategy to lower cooling demand in hot climate. Experimental work was carried out to analyse the impact of using plantation for solar control of building façades. External and internal wall surface and external and internal ambient temperatures were measured for plant shaded and bare wall located at the same area on the same façades in Al-Ain City, UAE during a hot summer period. The experimental results showed that plants-shaded walls constitute an excellent passive strategy for reducing heat gain by lowering the inner space temperature by about 5 °C and the peak air conditioning energy demand by up to 20%. Additionally, the plantshaded wall technique contribute directly to LEED credits since it covers issues like sustainability, energy saving, air quality, and sound reduction.
Keywords: Al-Ain, energy efficiency, hot climate, plant-shaded wall, thermal performance