노후 학교 건물의 외피 교체의 적정성 검토-냉방부하 증가 원인의 분석

The purpose of this study is to analyze the heating and cooling energy demand according to the thermal performance changes in building envelope by retrofits. Previous study’s result showed that the annual total energy consumption decreased as the envelope thermal resistance improved, but the cooling energy use increased when window and wall is replaced with latest standard. This is because the high internal heat gain level of the school buildings and the internal heat cannot escape through window and wall when the envelope thermal performance is improved. In order to verify this assumption, the changes of thermal performance according to the envelope changes were analyzed by simulation. As a result, the cooling load increased with the improvement of the thermal performance of building envelope in old school buildings because of the higher internal heat generation level in school buildings.