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구리산화물 첨착 화산재를 이용한 톨루엔 제거에 관한 연구
김지헌(Jee-Hern Kim),윤동원(Dong-Won Yoon) 한국생활환경학회 2011 한국생활환경학회지 Vol.18 No.6
Indoor chemicals emitted from building materials has been caused a sick building syndrome and environmental disease like an atopic dermatitis. A development of absorptive building materials has been applied to remove indoor contaminants and to improve indoor air quality. In this study, ash as natural porous mineral materials that are used as raw materials for Sorptive building materials to improve the performance of the adsorption of Toluene. The copper oxide was impregnated into the porous surface of volcanic ash to give the removal performance of Toluene by oxidation. The mass impregnated Cu(No2)3(Copper nitrate) was set 1.0~2.0 wt% compared to The amount of ash. After impregnating the surface area and X-ray diffraction graphs were measured. When after 30 minutes of natural ash removal efficiency of 77.82% showed and removal rates gradually decrease with the passage of time when the 420 minutes has elapsed the removal efficiency was as low as 6.19%. Copper oxide was impregnated with 2 wt% when a 30-minute period, the removal efficiency was 96.19% and when the 390 minutes after removal efficiency of 92.93% was retained. Results of this study, the copper oxide impregnated ash removal efficiency of toluene was higher than the natural state of ash. By applying a modified natural material that will be possible to develop high-performance functional building materials than conventional things.
기능성 건축자재 개발을 위한 다공성 천연광물 소재의 휘발성유기화합물의(VOCs) 흡착성능 평가연구
김지헌(Kim, Jee-Hern),김효준(Kim, Hyo-Jun),윤동원(Yoon, Dong-Won) 한국건축친환경설비학회 2011 한국건축친환경설비학회 논문집 Vol.5 No.3
Indoor chemicals emitted from building materials has been caused a sick building syndrome and environmental disease like an atopic dermatitis. A development of absorptive building materials has been applied to remove indoor contaminants and to improve indoor air quality. The purpose of this study is to figure out the characteristics of absorbing properties for indoor chemicals with various porous mineral materials. The performance of adsorption abilities for VOCs has been measured with small test chamber methods. The adsorption performance of volatile organic compounds at the surface of the porous minerals has been evaluated. Various kinds of porous natural minerals such as zeolite, diatomaceous earth and volcanic ash were selected. Using the standard methods for the measurement of the adsorption performance has been applied with several standards of ISO / DIS 16000-23, ISO / DIS 16000-24 and JIS A 1906. The results utilize as basic data for development of absorptive building materials used for the improvement of indoor environment as a function of evaluating the suitability. Three of the natural porous materials of a Zeolite, Diatomaceous earth and Volcanic ash were evaluated for the adsorption performance of VOCs. The zeolite has the highest adsorption performance. The characteristics of the adsorption profiles for the VOCs has been described with the various natural porous types.
금속산화물 첨착에 의한 개질 화산재를 적용한 기능성 건축자재의 오염물질 흡착성능 평가에 관한 연구
김지헌(Kim, Jee-Hern),성남철(Seong, Nam-Chul),윤동원(Yoon, Dong-Won) 대한건축학회 2014 대한건축학회논문집 Vol.30 No.4
In this study, surface modification technology has been developed in order to improve toluene removal performance of volcanic ash which is used as an adsorptive building material. Furthermore, the performance of building materials with the addition of modified volcanic ash will be evaluated; and in turn, it will be used as fundamental information for the improvement of performance on functional building materials. In order to eliminate the toluene in the air, copper nitrate salts was impregnated on the surface of volcanic ash by one to two percent of its mass. To confirm its toluene adsorption performance, the modified volcanic ash was added for the purpose of Spray-painting composition production; and in turn, the performance evaluation on toluene adsorption was carried out. In the case of Toluene removal rate, all samples impregnated copper nitrate salts by 1 wt percent and 2 wt percent showed the rate equal to or higher than 90 percent. Spray-painting composition added by modified volcanic ash showed the adsorption rate of 67 percent on the first day and 60 percent on day 7. Spray-painting composition added by modified volcanic ash showed higher toluene adsorption performance than the one with natural volcanic ash. Therefore, in order to enhance the performance of indoor contaminants removal by functional building materials, various materials should be developed.
CFD를 이용한 지하공동구에서 내부 풍량 변화에 따른 온도 및 상대습도 분포 해석
성남철(Nam Chul Seong),김지헌(Jee-Hern Kim),최기봉(Ki-Bong Choi) 한국건축친환경설비학회 2017 한국건축친환경설비학회 논문집 Vol.11 No.4
The underground utility tunnel facility is specified in the Urban Planning Act so as to aim for the aesthetic appearance of a city, preservation of road structure, and smooth flow of traffic. Especially, it has also been recognized as a life line of modern cities and national infrastructure in highly developed modern society. As it was explained above, the underground utility tunnel is a very important infrastructure in modern urbanization. But it is true that a lot of problems are being pointed out such as the reduction of air quality, reduction of ventilation volume, dew condensation and non-emission of poisonous gas due to the lack of smoke ventilating facilities in case of a fire breaking out in a utility tunnel because, in relative contrast to the rise in demand of underground utility tunnels in the city, the factors of underground space had not been reflected properly in the design and construction of underground utility tunnels and its maintenance system. The purpose of this study is to estimate temperature distribution using computational fluid dynamics (CFD) at a cross section in underground utility tunnels. As a result, a temperature distribution at middle point between supply and exhaust is not changed and maintained temperature and a humidity distribution at middle point between supply and exhaust is decreased 30 percent, approximately as by increase of ventilation rate.
인공신경망을 이용한 건물의 에너지 모델 최적화 알고리즘 개발 및 검증에 관한 연구
성남철(Nam Chul Seong),김지헌(Jee-Hern Kim),최원창(Wonchang Choi),윤상천(Sang-Chun Yoon),Nabil Nassif 한국생활환경학회 2017 한국생활환경학회지 Vol.24 No.1
This paper discusses the modeling methodologies and optimization methods for building energy system using time series auto regression artificial neural networks. The model can be integrated into energy solution tools for building energy assessment, optimization, and many other applications. The model predicts whole building energy consumptions as function of four input variables, dry bulb and wet bulb outdoor air temperatures, hour of day and type of day. To train and test the models, data from simulations are used for the analysis. Advanced computational methods are used for data analysis and preprocessing. Different neural network structures are tested along with various input and feedback delays to determine the one yielding the best results. The optimization method was also developed to automate the process of finding the best model structure that can produce the best accurate prediction against the actual data. The results show that the developed model can provide results sufficiently accurate for its use in various energy efficiency and saving estimation applications.
성남철(Seong, Nam Chul),김지헌(Kim, Jee-hern),윤동원(Yoon, Dong-won) 한국건축친환경설비학회 2014 한국건축친환경설비학회 논문집 Vol.8 No.6
The underground utility tunnel is a very important infrastructure in modern urbanization. The purpose of this study is to establish a database for the environmental information of underground utility tunnels by measuring the temperature, humidity, surface temperature and air velocity in underground utility tunnels, and to use it as base data for maintaining and design. The underground utility tunnel located at Inchon, Korea was selected as the subject for the study. The point of measurement was the halfway point between the inlet and outlet of the utility tunnel. The air velocity with and without mechanical ventilation operation were compared and they were summarized. As a result of measuring the underground utility tunnel which was the subject of this study, it is considered that there will be almost no risk factor such as the weakening of structural durability, corrosion of indoor facilities and electric leakage of electric power facilities because the normal conditions. However, it is necessary to establish a database by collecting more data and additional measurement during spring, summer season.