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서장후(Janghoo Seo) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.12
Recently, the indoor air pollution by microbes such as fungi and mites have become a concern as important research topic on indoor air quality. Fungal growth is significantly affected by humidity. In this study, we examined the influence of relative humidity on the surface of building materials and the water content of building materials on the fungal growth rate by measuring the mycelium length of fungi in the fungal detector placed on the surface of building materials. As a result, even if the relative humidity on the surface of building materials is identical, the more water content of building materials is, the more fungi grow faster. It was suggested that fungal growth rate depends on not only the relative humidity on the surface of building materials but also the water content of building materials.
바닥재에서 발생하는 준휘발성유기화합물 측정 및 챔버 내 기류 특성 평가
서장후(Janghoo Seo),Shinsuke Kato,임만택(Mann-Taek Lim) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
Some types of semi-Volatile organic compounds (SVOC) that are emitted from plastics used in building materials and household appliances have associated health risks, even at low concentrations. In this study, micro chamber method for measuring SVOC is introduced and SVOC such as di (2-ethylhexyl) phthalate and butylated hydroxyltoluene emitted a flooring material were measured using a micro chamber method. Airflow characteristics in a micro test chamber deeply depended on air exchange rate. From the evaluation using an index of air change efficiency, such as the air age and the coefficient of air change performance, a fixed air exchange rate of 1.5 h?¹ in the micro chamber is desirable.
서장후(Janghoo Seo) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.5
Semi volatile organic compounds (SVOCs) are used as plasticizers in building materials, interior materials, furniture, consumer electronics, etc. In the home, these SVOCs mix together with house dust. There is thus concern over the health effects of SVOCs in the home. there is a risk that they influence childhood asthma and allergies. It is difficult to measure SVOCs emission rates from building materials or household appliances utilizing the usual test chamber methods, because the boiling points of SVOCs are higher and they are apt to adhere to the surface of the test chamber used. In this study, we introduce FLEC chamber method, passive sampler method and micro chamber method, which are used in Germany and Japan in order to measure SVOCs emission rates. Characteristic, merits and demerits of test methods are also considered.
실내 아세트알데히드 농도 저감형 건축자재의 성능 평가 및 영향인자
서장후(Janghoo Seo) 한국건축친환경설비학회 2011 한국건축친환경설비학회 논문집 Vol.5 No.2
The use of sorptive building materials on room surfaces seems effective for decreasing VOCs and aldehydes concentrations that have the possibility of affecting human health. Giving the construction materials themselves the property of reducing the concentration of indoor pollutants has been reported as simple and effective, because it is highly effective without requiring the operation of special equipment. In this study, we evaluated the effects of sorptive building materials with respect to decreasing acetaldehyde concentrations in air using a small test chamber. we examined how the concentration of chemical compounds, temperature, and relative humidity influenced the sorptive performance for acetaldehyde, which was well reproduced experimentally with the computational fluid dynamics (CFD) simulations. The experiments and CFD analysis show that sorptive building materials have a fairly strong effect of decreasing acetaldehyde concentrations in rooms, and that this effect can be expected in practical use.
Ri Ryu,Janghoo Seo,Yongseong Kim 보안공학연구지원센터 2014 International Journal of Smart Home Vol.8 No.6
This study was conducted to apply a phase change material (PCM) to the inner skin part of a double skin facade to positively utilize natural solar heat so that a double skin facade may not only counteract external environmental changes but also positively introduce external natural solar energy, highlighting the advantages of a double skin facade. However, PCM is currently used by impregnating to a wall or a board of a building. Studies on the determination of an appropriate PCM temperature according to the applications are only conducted with respect to a wall or a board. Applying a PCM to an inner part of a double skin facade system involves variables such as impregnation method and appropriate temperature. These are the properties of a PCM, which are important variables directly affecting the room temperature depending on the mixing ratios and applications targets. This study was conducted with respect to window surfaces having a direct impact on the inside and the outside of a building to select a double skin facade system having excellent energy-saving performance and determine a PCM temperature which is applicable to a double skin facade, verifying the indoor energy-saving effect depending on the application of a PCM to the inner part of a double skin facade.