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전열교환 환기시스템의 운전 상태에 따른 결로 발생에 관한 연구
전병헌(Byung-Heon Jeon),김종원(Jong-Won Kim),이승갑(Seung-Kap Lee),이영주(Young-Ju Lee),안영철(Young-Chull Ahn) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.10
Heat-recovery ventilators are being adopted in most newly built apartment houses for energy reduction and indoor environment improvement. In winter, however, the dew condensation resulting from the difference between the indoor and outdoor temperatures may reduce the ventilator.s performance and threaten the health of indoor residents. This study analyzes the occurrence of dew condensation according to the ventilator.s operational conditions and the changes of temperature and products. The experimental results show that condensations is formed at 26℃ and 60%R.H, which is an unfavorable climatic condition, and when the damper is not closed tightly. Therefore it is important to ensure damper performance to prevent back flow.
스페이서의 재질변화에 따른 전열교환기 성능변화에 관한 연구
임태건(Tae-Kun Lim),전병헌(Byung-Heon Jeon),김종원(Jong-Won Kim),정성학(Sung-Hak Jung),이승갑(Seung-Kap Lee),안영철(Young-Chull Ahn) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.3
The importance of ventilation system is being emphasized by interest of indoor air quality. Especially, heat recovery ventilation system has attracted attention as most effective ventilation plan. Because it can reduce hazardous construction materials, indoor air pollutions, and also can reduce air conditioning energy cost. In heat recovery ventilator, the element core is the most important part. The element core is composed of liner and spacer. And liner and spacer are stacked alternately. On the Liner, heat and humidity transfer are made between supply and exhaust air. And spacer plays a role as a tunnel of exhaust and supply. In this study, we investigated and analyzed the efficiency of a heat recovery ventilator, when the spacer’s properties are changed. As a result, difference spacer’s properties affect an efficiency of heat recovery ventilator.
양전하가 부가된 수처리 필터의 입자제거특성에 관한 연구
정성학(Sung-Hak Jung),김종원(Jong-Won Kim),김상희(Sang-Hee Kim),전병헌(Byung-Heon Jeon),이승갑(Seung-Gap Lee),이재근(Jae-Keun Lee),안영철(Young-Chull Ahn) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.5
The purpose of the present work is to investigate the removal characteristics of positively charged filters for capturing negatively charged particles such as bacteria and virus in water. In order to reduce the pressure drop and increase the filtration efficiency, the filter media, modified by charge modifier having positive functional groups, is developed and evaluated. Improved liquid filters have been developed with the modified surface charge to capture and adsorb particles by electrokinetic interaction between the filter surface and particles contained in an aqueous liquid. The positively charged filter media is composed of glass fiber, cellulose and poly-ethylenimine resin for positively charging with the variation of volume ratio. The zeta potential value of the positively charged filter is +37.92 mV at the glass fiber and cellulose content ratio of 50:50 with resin content of 100%, while that of the PSL test particle is -23.5 mV at pH 7. The removal efficiency of the electro-positively charged filter is 98% for PSL particles of 0.11 ㎛, while that of the negatively charged filter is 7%. The positively charged filter media showed the potential to be an effective method for removing fine particles from the contaminated water for liquid filtration.