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RISS 인기검색어
- 검색키워드
- 저자 : Zainul Alim Ali Murtadlo (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Filtration Efficiency of Electrically Charged Air Filters by a Corona Method
Murtadlo, Zainul Alim Ali,Joe, Yun-Haeng,Park, Seok-Hoon,Park, Hyun-Seol Korean Association for Particle and Aerosol Resear 2019 Particle and Aerosol Research Vol.15 No.1
The influences of corona charging parameters on collection efficiency and surface potential of air filters were investigated. A polypropylene filter medium was electrically charged using a corona charger, and the resulting surface potential and filtration efficiency against neutralized KCl particles were measured. The filter media was charged under different conditions of applied voltage, voltage polarity, charging time, and distance between electrodes. In addition, we considered charging both sides of the filter as well as charging one side of the filter. As a result, electrical force obtained by charged fiber affected filtration efficiency when the apply voltage strength was higher than 7 kV. Negatively charged filter had higher filtration efficiency than positively charged filter while the surface potential of the negatively charged filter was slightly lower than those of positively charged filter. Moreover, the filtration efficiency increased as the charging time of filter fiber increased and the distance between electrodes decreased. The filtration efficiency was more sensitive to changes of charging time than to those of electrode distance, and the efficiency of both sides charged filter was higher than that of single side charged filter.
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다양한 호흡기 보호용 면체 마스크의 서브 마이크론 입자에 대한 여과 성능 평가
Zainul Alim Ali Murtadlo,조희주,박현설 한국입자에어로졸학회 2023 Particle and Aerosol Research Vol.19 No.1
Respiratory face masks are protective facepieces that are designed to filter inhaled air. They are easy-to-use devices that can protect the wearer against various hazardous particles in the air. Respiratory face masks also prevent the spread of viruses and bacteria-containing droplets that are released from the coughing or sneezing of the infected people. During the COVID-19 pandemic, various types of face masks have circulated on the market. Their ability to filter sub-micron particles, which are the sizes of harmful particulate matter and airborne viruses, needs to be investigated. Their breathability, the easiness of breath through the mask, also needs to be considered. In this study, wwe evaluated the performance of filters used for different types of face masks certified by different standards including Korean (KF94, KF80, KF-AD), USA (N95), and Chinese (KN95) standards. We also tested the filters of nanofiber masks and surgical masks for which there are no standards for filtration test. The N95 mask filters showed the highest quality factor for capturing virus-sized particles. The other types of mask filters have acceptable performance except for nanofiber mask filters whose performance is very low.
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여과재 표면처리 방식에 따른 백필터의 탈진 및 먼지배출 특성
박현설,김동수,조희주,심준목,Zainul Alim Ali Murtadlo,조철희 한국대기환경학회 2022 한국대기환경학회지 Vol.38 No.6
This study was conducted to investigate the effect of surface treatment of filter media on the performance of bag filters. To this end, four bag filters were prepared using the different filter media made by four different surface treatment methods. Both surface and cross-sectional structures of each filter medium were examined, and the basic filtration properties of the filter media were tested. Based on the test results of the filter media, the cleaning and dust emission performance of each bag filter was evaluated using a bag filter test unit, followed by repeated filtration-cleaning cycles under dust loading conditions. As a result, the bag filters made of calendered and singed filter media with low pressure drop had cleaning intervals 3 times longer than bag filters made of membrane-laminated media. The singed filter bag, whose medium has a very porous inner structure, showed a very high concentration of dust emission which is 10 times higher than those of other bags. In addition, for the membrane-coated filter media, the pore structure of the membrane greatly affected the pressure loss of the filter media and the cleaning performance of bag filters. Among the filters tested in this work, the bag filter made of the calendered filter medium showed the best performance in terms of cleaning interval and dust emission due to the characteristics of surface and cross-sectional structure of the medium.
ScienceON
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