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Gerdien 이온측정기를 이용한 에어로졸의 하전 특성 분석에 관한 연구
조윤행,심준목,신일경,육세진,박현설,Joe, Yun-Haeng,Shim, Joonmok,Shin, Il-Kyoung,Yook, Se-Jin,Park, Hyun-Seol 한국입자에어로졸학회 2018 Particle and Aerosol Research Vol.14 No.1
Since the motion of the charged particle strongly depends on its charge characteristics, information on charge distributions of target particles is one of the important variables in aerosol research. In this study, charged distribution of atomized NaCl particles were measured using a Gerdien type ion counter. Two kinds of particle charging conditions were used in this study. First, atomized NaCl particles were passed through an aerosol neutralizer to have a Boltzmann charge distribution, and then its charge distribution was measured. In this case, the portion of uncharged particles was compared with the portion obtained from the Boltzmann charge distribution for verifying the suggested experimental method. Second, same experiment was conducted without the aerosol neutralizer to measure the charge distribution of atomized and un-neutralized NaCl particles. In the conclusion, the portion of uncharged, negatively charged and positively charged particles were 19%, 62% and 20%, respectively, for neutralized particles. The atomized particles, which was generated without the aerosol neutralizer, also had almost a zero charge state, but the standard deviation in charge distribution was larger than that of neutralized particles. The test method proposed in this study is expected to be used in various aerosol research fields because it can obtain simple information on the particle charge characteristics more easily and quickly than the existing test methods.
조윤행,신동호,박현설,허지은,심준목,Joe, Yun-Haeng,Shin, Dongho,Park, Hyun-Seol,Heo, Jieun,Shim, Joonmok 한국입자에어로졸학회 2021 Particle and Aerosol Research Vol.17 No.2
In this study, the clean air delivery rate (CADR) of ceiling air circulator (CAA) was determined under indoor environmental simulation conditions. An air filter was used to provide air cleaning ability to the CAA. The CADR of filter adapted CAA was evaluated and compared with the value of commercial air purifier. The installation of mesh-shaped filter on the CAA showed particle reduction effect on the particles over 0.4 ㎛ in diameter, but the CADR was up to 0.25 m<sup>3</sup>/min. When the filter having 99.9% in collection efficiency was installed on the CAA, its CADR was 1.52 m<sup>3</sup>/min, while the CADR of commercial air purifier was 3.19 m<sup>3</sup>/min.
밀폐공간에서 비말 가림막 높이에 따른 감염성 비말 공기전파 차단능력 평가
허지은,조희주,박현설,신동호,심준목,조윤행,Heo, Jieun,Cho, Hee-joo,Park, Hyun-Seol,Shin, Dongho,Shim, Joonmok,Joe, Yun-Haeng 한국입자에어로졸학회 2021 Particle and Aerosol Research Vol.17 No.2
Although the installation of droplet protection screen (DPS) is known to prevent droplet transmission, there is still a lack of knowledge in effectiveness of DPS installation to block the airborne transmission. In this study, the prevention ability of DPS against airborne transmission was evaluated according to the DPS height. When the DPS was not installed, the maximum concentration of PM1.0 at the location opposite to infected person was 35% of that at the infected person location. When the DPS was installed, the DPS effectively prevented the airborne transmission, consequently approximately 7% of generated particles were measured at the opposite location from particle generation position (infected person location). The prevention ability of DPS increased with DPS height, the maximum prevention efficiency of 95.1% was obtained when the DPS height was 900mm. Moreover, the speed of airborne transmission was delayed by installation of DPS, and the delay time increased with DPS height.