ZEMCH 2019 International Conference Proceedings April.2020 | Page 305
Figure 5. Location of Temperature Sensors
To get more accurate measurement results, three temperature sensors were located at each point.
The temperature at each point was determined by averaging the three measured values.
The hot box facility was calibrated using polystyrene foam board whose thermal conductivity had
been acquired from heat flow meter apparatus test at an accredited laboratory designated by KOLAS,
Korea Laboratory Accreditation Scheme.
Tests were conducted with hot region temperature 20℃ and cold region temperature 0℃. The heat
flow rate from hot region to the cold region is determined from energy input to the hot region as in the
case with ASTM C 1363. The overall thermal transmittance was calculated after steady‐state conditions
have been achieved. Data were recorded three times every hour and averaged. The overall thermal
transmittance (U) can be obtained from Equation (1).
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