Analysis of Thermal Resistance and Thermal Transmittance of Apartment House Opaque Exterior Wall by Application of Dynamic Method

As the theoretically calculated thermal resistance and transmittance in the old buildings are reported to differ from values through measurement. it is essential to accurately diagnose thermal resistance and transmittance, and the average method suggested by ISO 9869-1 is used for accurate thermal diagnosis of the exterior wall. Average method requires more than 10℃ of temperature difference between indoor and outdoor, and requires a long-term measurement. On the other hand, the dynamic method can be analyzed even if the temperature difference is small. And many research has shown that the measurement period can be shortened. In this study, in order to calculate the dynamic method by ISO 9869-1, in-situ measurements were conducted on the exterior wall of the apartment for 3 weeks. In addition, thermal resistance and transmittance were derived using R program. As a result of confirming the change in value as the measurement period increased, it converged to a certain point and the thermal resistance was 0.984±0.004㎡· K/W, thermal transmittance was 0.912±0.004 W/㎡·K. Compared to the final thermal resistance and transmittance by the average method, it is analyzed at the deviation of 0.4%. and it can be that the calculation of thermal resistance and transmittance by the dynamic method is reasonable.