| Keywords |
Average method; Dynamic method; In-situ measurement; Thermal resistance; Heat flowmeter method |
| Abstract |
This study comparative analyzed the convergence of the in-situ thermal resistance obtained by the average and dynamic methods using criteria of ISO 9869-1. To obtain stable convergence of the thermal resistance is necessary not only to secure interior-exterior temperature differences that were higher than the recommended value of 10oC but also to keep constant. The measurement was conducted for an exterior wall of an apartment over a period of three weeks. And according to the degree of stability of the temperature difference between interior and exterior divided the section. The result showed both sufficiency and insufficiency of the convergence criteria when temperature of the environment was unstable in the repeated based on the average and dynamic methods. On the contrary, when the consistency of the temperature was satisfied, stable thermal resistance was shown throughout the measurement. Also, in this measurement, the temperature of environment is required to have maintenance of interior-exterior temperature difference for at least six days to ensure stable thermal resistance. In this way, regardless of the average or dynamic methods, thermal resistance that satisfies the convergence condition could be derived by using ISO 9869-1 when stability of interior-exterior temperature difference are met. |