아파트 북측 벽면의 단열 보강 효과에 대한 기초적 연구

초록

Korean apartment buildings are traditionally designed with a strong preference for south-facing orientations and balcony extensions are common. The south-facing façades of the dwelling units benefit from solar heat gains during winter owing to the low solar altitude at noon, resulting in relatively low heating loads. In contrast, north-facing façades do not receive direct solar radiation, which inevitably leads to greater heat losses compared with other orientations. Therefore, examining the thermal characteristics of north-facing rooms and quantitatively identifying the effects of the insulation reinforcement of north-facing walls are important for establishing energy-saving strategies for new construction and renovation projects. Accordingly, this study focused on a typical flat-type apartment unit, and the thermal environment and heat transfer during the heating period in rooms facing north were extensively investigated. Additionally, the heating energy-saving effects resulting from the insulation reinforcement of the north-facing walls were evaluated. Consequently, the north-facing room was scarcely influenced by direct solar radiation, and its average indoor temperature in winter under non-heating conditions was approximately 5℃ lower than that of the south-facing room. Although the south-facing room experienced almost no heating load, even during winter, the north-facing room exhibited heating loads of approximately 3–6 kWh/m² in January–February and December. Insulation reinforcement of north-facing walls reduced the heating load by approximately 7.2–7.9% for the entire dwelling unit, whereas a reduction of 15.8–17.2% was observed when the analysis was limited to a north-facing room. Based on these results, the insulation reinforcement of north-facing walls is expected to be highly effective in reducing the heating energy consumption.

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