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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.
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.
수치해석을 통한 저심도 유닛형 지중열교환기의 성능 검토
오진환(JinHwan Oh),서장후(JangHoo Seo),남유진(Yujin Nam) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.3
Recently, ground source heat pump (GSHP) systems have attracted much attention, according to the enhanced social demand of renewable energy. GSHP systems can achieve higher coefficient of performance than the conventional air-source heat pump systems by utilizing stable underground temperature. However, the initial cost of GSHP system is higher than that of the conventional systems, especially, in the small-size buildings. Therefore, it is necessary to develop small-size ground heat exchanger with low cost and quick installation. In this study, a unit-type ground heat exchanger was developed and heat exchange rate was calculated by the numerical simulation. As a result, 27.45 W/m of heat exchange rate was acquired in the condition of 0.5 m × 0.2 m × 2 m unit.
데이터센터에 적용된 외기도입 냉방시스템에서 필터유형별 에너지 소비량 변화
박성현(Seonghyun Park),서장후(Janghoo Seo),정용호(Yong-Ho Jung),장현재(Hyun-Jae Chang),황석호(Seok-Ho Hwang) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.7
Recently, many studies related to reducing the energy consumption in data centers have been conducted. These studies have mainly focused on the air intake and exhaust system of a computer room air handling unit (CRAH) in the server room, diffuser type, suppression and discharge of the heat generated from the server, and the air-side economizer system. In this study, the energy consumption of the conventional central chilled water cooling system is compared with the energy consumption of the air-side economizer system. We also examined how changes of differential pressure by each filter have influenced energy consumption, using the power usage effectiveness (PUE). Results show that the PUE was improved, and energy consumption decreased, by applying the air-side economizer system.