การศึกษาอิทธิพลของอุณหภูมิเฉลี่ยพื้นผิวโดยรอบกับโซนสบาย / อโณทัย ธนะเจริญกิจ = A study of mean radiant temperature for thermal comfort / Anothai Thanachareonkit
Thailand has a hot-humid climate. The climate is considered out of thermal comfort zone almost all year round. เท order to achieve an inside environment thermal comfort, the Mean Radiant Temperature (MRT) can be modified. The objectives of this research are, firstly, to find the factors that have influences on the MRT, secondly, to study and analyze the effects of these factors on the MRT and, finally, to use the research results as architectural design guidelines. The research is divided into 3 stages: first, studying the factors that have effects on the MRT by using simulated buildings, second, studying the influences of these factors in actual environments and third, analyzing the research results obtained for the study process. The variables used in the experimental process include the wall mass, wall direction, ventilation, influences of the sun radiation, roof angle and proportion of the building. Having analyzed the factors that have effects on the MRT from the simulated buildings. In daytime and nighttime condition are discussed separately. During the daytime, the results can concluded as follows. Considering the wall mass, when the ambient air temperature is higher, a high-massed wall can reduce the MRT by 13 ℃ when comparing with the low-massed condition. เท respect to the wall orientation, it is found that the wall on the north side has lower MRT than the others. While the wall, which exposed to diffuse radiation, can reduce the MRT by 6 ℃. In case of the ventilation impact, the ventilation can reduce the MRT in the low-massed building but increase the MRT in the high-massed building. When studying the roof angle, it revealed that if the roof angle is increased, the MRT will decrease. While considering the building height, it is found that the high building can reduce the MRT. During the nighttime, the wall with different in thermal mass, the low-massed building has lower MRT than the higher one, In the wall orientation study in low-massed building, the orientation has less effect on the MRT. While Ventilation reduce the MRT เท high-massed building but no effect on low-massed building. About roof angle, it is found the high roof angle will increase the MRT. In conclusion, this study revealed that in the building without air conditioning, the MRT can be reduced by 1) using the thermal mass 2) increasing the roof angle 3) providing the good ventilation 4) reducing the influences of direct radiation 5) increasing the ceilling height. The finding of this research can be used in architectural design in order to modify the interior environment and make it more appropriate for using the passive system.