การศึกษาศักยภาพการลดรังสีอาทิตย์รวม โดยใช้พืชอากาศสำหรับหลังคาเขียว

Abstract

Since a high intensive of solar radiation in Thailand, air conditioner is required to install in many commercial building resulting in the global warming. Therefore, the increasing of area of green roof by growing plants at the rooftop of the building could reduce the temperature inside the building. The researcher was then interested in using the plant named Tillandsia Cotton Candy which is the monocots phylum in Bromeliaceae specie (same as pineapple). Tillandsia is a lightweight weather-resistant plant which can grow in the air without soil and can well resist with the drought. Besides, Tillandsia can photosynthesize by the method of Crassulacean Acid Metabolism (CAM) and consists of Trichome in its whole trunk which help absorb the moistness and nutrients in the air. The hypothesis for this research is that the green roofs can reduce solar radiation on the rooftop. It took one year for the experiment, starting April 2015 to March 2016. The researchers measured the solar radiation by using Solarimeter and investigated the relation between solar radiation and the index of leaves surface area and weight of the Tillandsia Cotton Candy. The solar radiation was compared between in the empty area and in the green area under the rooftop. The study result showed that the solar radiation rate in the empty area each months was between 1,086.2-1,261.1 W/m2 and solar radiation was found having the highest rate in March 2016 and lowest rate in December 2015. The green rooftop could help reducing solar radiation averagely 907.7 W/m2 per month, or 78.20 percent. It was also found that the relation between the solar radiation and the leaves area (r=0.84, p <0.001) and weight of the Tillandsia Cotton Candy (r = 0.89, p<0.001).