기존 노후건축물의 최적 리모델링 개선안 연구

The energy loss can be divided into the loss caused by heat transfer and the loss caused by airflow. Heat transfer is the loss resulting from the heat transmittance of external wall, roof, and floor, and representsone of the most vulnerable elements of existing buildings. To prevent such loss, it is necessary to increasethe mean heat transmittance of entire external wall, including the window, to a level above the standard regionalvalue and ensure the air-tightness of window. The old buildings have the structure which is prone to the lossof greater air flow due to the air infiltration through the exit/entrance door upward along the stairway by thestack effect and simultaneous suction of air from each floor, and becomes even vulnerable to the loss of heatinsulation for each floor, although the external wall and windows are the most vulnerable parts. The improvementplans for each floor need to be submitted in tandem with the diagnosis of whole building, regarding the diagnosisplan and energy improvement measures based on the survey of site, rather than adhering to the misconceptionthat the replacement of window alone will result in energy-savings.