단계적 기밀개선 적용 대학 강의실의 Blower Door 및 Tracer Gas 기반 기밀성능 평가 = Airtightness Evaluation of a University Classroom Applying Stepwise Airtightness Improvements Using the Blower Door and Tracer Gas Method

다국어 초록 (Multilingual Abstract)

Purpose: This study examined the airtightness of a university classroom by focusing on the main leakage parts of the building. Many Korean schools are old, and poor airtightness increases energy use. For this reason, improving airtightness is an important part of green remodeling in educational buildings. However, the effect of step-by-step airtightness improvement has not been well studied in real classrooms. Method: In this study, the leakage parts were divided into three groups: architectural, mechanical and electrical, and miscellaneous envelope leakage.
Airtightness improvements were applied step-by-step, and the changes in performance were measured using the Blower Door Test and the Tracer Gas Method. Four cases (Baseline, Architectural improvement, Architectural + Mechanical/Electrical improvement, and Architectural + Mechanical/Electrical + Miscellaneous leakage improvement) were tested. The Blower Door Test followed ASTM E779 and ISO 9972, and the Tracer Gas Method followed KS I ISO 16000-1. Result: ACH50 decreased from 25.9h-1 to 14.0h-1 (46% reduction). The ACH measured by the Tracer Gas Method also decreased from 0.38h-1 to 0.18h-1 (51% reduction). The Effective Leakage Area (ELA) decreased by about 53% in the final case, showing that both airflow and leakage area were reduced. The contribution of each leakage group was architectural parts (72.1%), miscellaneous envelope leakage (19.7%), and mechanical/electrical parts (8.2%). This means most leakage occurs through windows, doors, and joints. The study also confirmed that ACH50/20 may overestimate natural ventilation. This study provides practical data for deciding priorities when planning airtightness improvements in school green remodeling.