축열교정법에 의한 공동주택 외벽체 동절기 현장 열저항과 열관류율 측정 및 분석

This study evaluates the possibility of shortening measurement time to obtain the accurate in situ thermaltransmittance (U-value) and thermal resistance (R-value) by the average method considering the thermal storage effect(AMSE) compared to the progressive average method (PAM). The measurement campaign was conducted on the opaqueexternal wall of an apartment house located in Seoul for two weeks in the winter and was performed in compliancewith the ISO 9869-1 standard. As a results of the measurement, U-value and R-value analyzed by PAM did not convergeduring the two weeks period, even though the experimental conditions specified in ISO 9869-1 were met. The analyticalresults by AMSE show that as the correction period to apply the storage effect becomes longer, the fluctuation of Uvalueand R-value greatly decrease and two values tend to converge to the respective asymptotical values. Therefore,although extensive research is needed for more cases, it is considered that AMSE can shorten the measurement periodto determine the U-value and R-value to a reasonable level of accuracy.