Temperature assessment of extensive green roof system under tropical climatic condition.

In the last few decades, new urban areas and city development projects are being created throughout Southeast Asia to accommodate the rapidly urbanizing population. As a result, urban heat flow, heat-absorbing construction materials, and reduced vegetation coverage have a significant impact on the microclimate of cities, building performance, and the quality of urban living. Therefore, it is critical to consider and implement strategies to improve the thermal conditions in urban areas. This study investigates the potential of indoor and ambient temperature reduction in tropical climatic conditions under an extensive green roof system. The palm oil clinker was used as a drainage layer with different depths of 60 mm, 70 mm and 80 mm. The temperature sensor was placed inside the wooden cubicle to monitor the indoor temperature. Beach morning glory (Ipomoea pes-caprae) was used as a vegetative layer and the ambient temperature was measured in between the plant. The results showed that the indoor temperature of the green roof has a reduction of 1°C to 2°C as compared to the bare roof from 10.00 AM until 4.00 PM. Meanwhile, the ambient temperature of the green roof has an average reduction of 3°C to 4°C from 10.00 AM until 4.00 PM. The reduction in the indoor temperature of the green roof has reflected the indoor heat gain and thus reduced the energy consumption to cool the building. In addition, the extensive green roof has the potential to reduce the temperature due to the effect of urban heat islands (UHI). [ABSTRACT FROM AUTHOR]