공동주택 건축물 에너지효율등급 분석평가

Abstract

This study examined the factors contributing to variations in building energy efficiency ratings among apartment complexes constructed under identical insulation standards and climatic conditions. A total of 88 apartment complexes located in Seoul and Gyeonggi Provinces were analyzed using preliminary certification data from the ECO2 program, including site energy demand, site energy consumption, and source energy consumption. To evaluate the statistical significance of differences between certification grades, Welch’s analysis of variance (Welch’s ANOVA) was applied, while considering potential violations of the assumptions of normality and homogeneity of variance. Results indicated that while site energy demand was generally consistent across certification grades, site heating energy consumption exhibited statistically significant differences—particularly in complexes employing individual heating systems, which demonstrated lower system efficiency. In addition, differences in the installed capacity of solar photovoltaic systems were found to partially explain variations in the overall energy efficiency ratings. These findings suggest that the heating system efficiency and integration of renewable energy technologies are key determinants of building energy performance ratings and provide a valuable basis for future energy policy and planning.