Efficient control of ventilation and cooling/heating systems in buildings is integral to making adjustments to indoor environments and to minimizing energy use. In high-rise buildings, however, the stack effect is generated through vertical shafts in the buildings, and the air flow due to the stack effect greatly affects the efficiency of air-conditioning systems used for ventilation, cooling, and heating. Therefore, attenuating the stack effect in high-rise buildings is a critical aspect of HVAC operations as well as a solution for direct problems related to the stack effect, such as high-velocity draft, high-level noise in the buildings, and so on.In general, as a method to attenuate the stack effect in high-rise buildings, revolving doors are installed at the lobby entrance. However, while this method may be effective on the floors where revolving doors are applied, the efficiency is very low when considering the entire building due to the existence of many air flow paths and the fact that revolving doors applied to only part of a building can control only a portion of the air flow. Numerical simulation analysis was performed in this study to quantitatively examine the stack effect attenuation characteristics of revolving doors on both a partial building level and for the entire building. In addition, the effects of building height and airtightness on the performance of the building envelope were considered.Keywords: stack effect; revolving door; stack effect attenuation; numerical simulation; high-rise buildings IntroductionSkyscrapers are currently being competitively constructed throughout Asia. As cities are becoming Manhattanized, the possibility of the stack effect in these new high-rise buildings inevitably increases. At the same time, the magnitude of problems created by the stack effect continues to grow. Problems generated by the stack effect in skyscrapers can mainly be divided into problems related to habitability and problems related to the performance of disaster prevention. The problems related to habitability, such as the occurrence of high-velocity drafts and highlevel noise in buildings, the incorrect operation and operational inability of doors, difficulty in controlling indoor cooling/heating environments, and so on, have been recognized as major problems resulting from the stack effect.The diffusion of poisonous gases from a fire is one of the concerns related to disaster prevention. If a fire

Nowadays, backflow odor, along with floor noise, has been recognized as an environmental right dispute element between the units within a multi-unit dwelling in Korea because it causes not only foul odors flowing back into the unit vent pipe to flow indoors and cause a problem of degraded air quality but also annoyance by foul odors and steam in balconies and bathrooms. Therefore, this study relates to the performance improvement of bathroom air duct facilities in multi-unit dwellings. This study aims to develop an automatic backflow preventive damper capable of reducing the air leakage rate in comparison to conventional air duct dampers and verify the backflow blocking performance of the automatic backflow preventive damper.As a result, unlike the existing damper, where air in the space assumed a bathroom was foggy because of the large amount of air leakage, the dry ice gas did not flow backwards to the bathroom in the space, where the automatic backflow preventive damper was applied. In addition, it was verified that the automatic backflow preventive damper had an excellent air leakage blocking performance of 98.6% compared to the air leakage blocking performance (80%) of the existing damper.

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