การเปรียบเทียบศักยภาพของการป้องกันความร้อนระหว่างการใช้สวนหลังคากับระบบหลังคาที่ใช้กันทั่วไป / ณัฏฐิณี นวลสกุล = A comparative study of thermal benefit between roof garden and conventional roof systems / Nattinee Nualsakul
Roofs absorb solar radiation and this causes its temperature to rises. Researches on the concrete roofs have found temperatures to be 10 ํC higher than the air temperature. The high roof's temperature causes the heat to be transfered into the building. The transfer affects the comfort of residents inside the building. This research focuses on the effect of heat transfer into such buildings with or without air-condition. Experiments were made on a model building divided into 4 roof types: concrete roof, grass, ground cover crops, and bush. Data of the interior surface temperatures are collected at key intervals. Research findings collected in March and April are as follows: for an air-conditioned environment, the interior-surface temperature of the concrete roof was 40.13 ํC, the grass covered roof was 26.73 ํC, the ground cover crops was 25.74 ํC, and bush was 25.17 ํC. For the non air-conditioned environment the interior-surface temperature of concrete roof was 39.36 ํC, grass covered roof was 30.12 ํC, ground cover crops was 29.11 ํC, and bush was 28.91 ํC, respectively. It can be concluded that the bush-covered rof is the best way to provide the lowest interior-surface temperature in the building. The radiation from the sun is reflect and very little is absorbed. Roof garden systems can reduce the heat transfer into buildings more than 15 ํC compared to a concrete roof. This in turn reduce the cooling load at least 89%. Research results can be applied in architectural design to reduce energy consumption.
