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하절기 냉방 조건시 공기청정기 사용에 따른 비말확산 영향분석 -코로나19 바이러스 전파를 중심으로-
나후승(Na, Hooseung),김형근(Kim, Hyungkeun),김태연(Kim, Taeyeon) 한국생태환경건축학회 2021 한국생태환경건축학회 학술발표대회 논문집 Vol.21 No.2
Due to the impact of the corona pandemic, indoor group infection has become a social problem. Indoor airflow is the main cause of group infection. Air conditioners and air purifiers have a major impact on indoor airflow. We analyzed of the effect of droplet dispersion according to the use of air purifiers in summer cooling conditions. As a result of the experiment, if the distance to the air purifier is close, the peak concentration increases and the possibility of direct infection increases. However, it has been shown that using an air purifier can reduce overall droplets, helping to prevent airborne infections.
생활 공기오염물질 노출 시나리오를 통한 재실자 인체 위해성 평가
김힘찬,나후승,김형근,김태연 한국생태환경건축학회 2017 한국생태환경건축학회 논문집 Vol.17 No.6
Purpose: Recently, indoor air quality (IAQ) is becoming more important to building occupants. World Health Organization (WHO) reported approximately 2.8 million people died in a year by exposure of indoor air pollutant. Besides, The United States Environmental Protection Agency (USEPA) reported that indoor air pollution is more hazardous than global warming and ozone depletion. Generally, it is regarded that pollutant on initial construction phase can easily effect on health of occupant. However, many researchers report that pollutant of long-term period can be more critical to occupants recently. Especially, the chemicals from pollution sources like spray and dry cleaned clothes are more critical to the indoor pollutant. Method: This study suggest pollutant exposure scenarios based on occupant behavior and ventilation pattern. This scenarios include long-term indoor pollutant concentration and health risk of occupants. This scenarios limited the pollutant sources as toluene and benzene from spray and tetrachloroethylene from dry cleaned clothes. Results: By using these scenarios, we assessed long-term indoor pollutant concentration and health risk of occupants.
CFD 시뮬레이션을 활용한 원형 환기창의 자연환기 성능 평가
최하늘,나후승,가서사,김형근,김나리,김태연 대한건축학회 2020 대한건축학회논문집 Vol.36 No.10
The purpose of this study is to comprehensively evaluate the natural ventilation performance of the circular ventilation window. The circularventilation window is a new type of window. This 145mm diameter window consists of a circular frame and a lid, and can be opened andclosed. The circular ventilation window has a feature that the installation position and number are relatively free. We evaluated the naturalventilation performance of the circular ventilation window using CFD simulation. Based on the experiment, the CFD model was built, andcase studies were performed under various conditions such as the window displacement, indoor/outdoor temperature difference, and outdoorwind speed. In addition, ventilation rates were compared with awning windows and casement windows. As a result, as the vertical distancebetween windows and the indoor/outdoor temperature difference increased, the ventilation rate tended to increase, and the ventilation patterngreatly changed according to the outdoor wind speed. Also, if the windows were arranged effectively, the ventilation rate could be increasedcompared to the existing windows. 본 연구의 목적은 원형 창의 환기 성능을 종합적으로 평가하는 것이다. 원형 창은 기존의 사각형 창호와는 다른 형태의 새로운 창이다. 지름 145mm의 이 창은, 원형 창 프레임과 뚜껑으로 구성된다. 원형창은 원하는 위치에, 원하는 개수를 설치할 수 있다는 것이 가장 큰 특징이다. 기존에는 없던 형태의 창호이기 때문에, 창의 주요 성능 중 하나인 자연환기 성능을 평가할 필요가 있다. 본 연구에서는 CFD 시뮬레이션을 이용해 원형 창의 자연환기를 평가하였다. 실험을 기반으로 CFD 모델을 구축했으며, 창의 설치 위치, 실내 외 온도차, 실외 풍속 등 다양한 조건에서 케이스 스터디를 수행하였다. 또한, 기존 사각 어닝 창, 케이스먼트 창과도 환기량을 비교하였다. 그 결과, 창 간 수직거리와 실내외 온도차가 증가할수록 환기율이 증가하는 경향을 보였으며, 실외 풍속에 따라 환기 양상이 크게 달라졌다. 또한, 창문을 효과적으로 배치한다면, 기존 창보다 환기율을 증가시킬 수도 있었다.