Abstract:
This study aims to apply the Internet of Things to collect the variable data in the classroom, study and analyze the variables that cause the cooling loads, including evaluation of the cooling loads in the classroom. The cooling load is calculated by an Overall Thermal Transfer Value (OTTV) all 4 sides of the classroom, which is 8.2 meters wide x 8.5 meters long x 4.1 meters high, for 1 classroom of an Electrical Power Department at Noen Kham Industrial and Community Education College in Chainat Province, that is compared to the requirements of the Ministry of Energy with OTTV value ≤ 50 watts per square meter. Also, it is comparatively studied in the use of classroom wall materials that affects the heat transfer of the classroom outdoor walls. When the wall material of the transparent glass is changed into the green one, the cooling load of the classroom is decreased.
The results show that the average Overall Thermal Transfer Value (OTTV) on each side of the classroom walls for all 4 sides are as the following: Sidewalk (SW) equals to 31.076 W/m2, Hall side equals to 90.392 W/m2, Outside of the balcony side equals to 33.982 W/m2 and the EP 005 classroom side equals to 25.793 W/m2. Thus, the average means of the outside building walls (OTTV) with all 4 sides equal to 4 4.206 W/m2, that meets the requirement for the Ministry of Energy (OTTV  50 w/m2). Comparing to the Overall Thermal Transfer Value (OTTV), only the hall side (SE) between the clear glass and the green one in case of no class teaching, it is found that the average Overall Thermal Transfer Value (OTTV) of the hall side (SE), the clear glass is reduced to 11.965 W/m2 or decreasing in 13.237 %.