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자동차 캐빈 공기질 제어를 위한 적정 입자청정횟수 평가
노광철,김태욱,황청하,한방우,김상우 한국입자에어로졸학회 2024 Particle and Aerosol Research Vol.20 No.2
In this study, an empirical study was conducted to investigate the clean air delivery rate (CADR) and the proper particle cleaned air delivery per hour (PCH) of the air cleaning device installed in passenger car cabin. Changes in internal particle concentration were measured in the cabins of the pick-up type engine-driven car and the electric vehicle depending on cabin air filters, ventilation modes, and blower settings. In the tested cars, PM2.5 collection efficiency of the HEPA filter was higher than that of the genuine filter. The PM2.5 collection efficiency of each cabin air filter was measured to be similar regardless of the blower setting of the tested cars. This means that the higher the blower setting, the higher the CADR and the PCH. The infiltration rate varies depending on the air tightness of the car. The cabin was more contaminated with particles under driving. From the CADRs measured inside the passenger car cabin, the recirculation mode of HVAC system is a more effective for managing ultrafine particles than the fresh air mode. From a few assumptions, the proper PCH was derived about 0.8 times/min (48 times/h). From this result and several experiments, the proper operation setting of air cleaning device installed inside cars can be found out to control indoor air quality. Also, an appropriate operation settings of HVAC system can be found with considering cooling and heating conditions for thermal comfort in passenger car cabin.
지하역사 공기청정기 성능평가 및 필터 유지보수 실증 연구
노광철,김상우,황청하 한국입자에어로졸학회 2024 Particle and Aerosol Research Vol.20 No.2
In this study, the performance of air cleaners installed in subway stations was evaluated using field test method and chamber test method in accordance with the standard for air cleaner. Also, the air filter maintenance period was examined by the performance reduction of air cleaners with respect to the air filter usage period. From the field tests, the clean air delivery rate (CADR) of air cleaners with filter in use was about 85% on average compared to the ones with new filter. The main factor of CADR reduction was not the decrease of filter efficiency but the decrease of airflow rate. The chamber test results shows that the CADR of air cleaners decreased with the usage time, but the proper filter replacement can make the CADR keep about 95% of the certified CADR. The expected filter replacement cycle measured by the field test method was calculated to be approximately 3.35 months (100 days). However, the replacement cycle was a large difference between 1.2 and 6.6 months with the different stations. Therefore, the replacement cycle should be individually investigated for each station. The use of air cleaners must be effective in reducing fine dust in subway stations. For more effective air quality management in subway stations, additional researches is necessary to define the appropriate capacity of HVAC system and air cleaner, and related maintenance for each station.
서울 초등학교 교실의 PM<sub>2.5</sub> 및 PM<sub>10</sub> 제거를 위한 학교용 공기청정기 실증
한방우,홍기정,신동호,김학준,김용진,김상복,김상우,황청하,노광철,Han, Bangwoo,Hong, Keejung,Shin, Dongho,Kim, Hakjoon,Kim, Yongjin,Kim, Sangbok,Kim, Sangwoo,Hwang, Cheongha,Noh, Kwangchul 한국입자에어로졸학회 2019 Particle and Aerosol Research Vol.15 No.2
It is important to control fine particles in children care centers, elementary schools, elderly care facilities and so on where vulnerable children and the aged stay during most of their time. This study has investigated $PM_{2.5}$ and $PM_{10}$ concentrations in two classrooms equipped with an air cleaner and two air cleaners, respectively and they were compared to those in a classroom without an air cleaner as well as those outdoors. Eight air cleaners which have various clean air delivery rates (CADRs) between 9.9 and $21.3m^3/min$ were tested in classrooms in two elementary schools in Seoul. Average $PM_{2.5}$ and $PM_{10}$ were $7.3{\pm}0.7$ and $45.5{\pm}4.1{\mu}g/m^3$ in classrooms equipped with an air cleaner and $4.2{\pm}0.6$ and $24.6{\pm}2.5{\mu}g/m^3$ in classrooms with two air cleaners, whereas they were $22.1{\pm}2.6$ and $109.1{\pm}9.6{\mu}g/m^3$ in classrooms without an air cleaner and $36.9{\pm}5.1$ and $74.1{\pm}10.6{\mu}g/m^3$ outdoors, respectively. $PM_{2.5}$ in classrooms could be reduced effectively by using an air cleaner or two air cleaners, because $PM_{2.5}$ was mainly infiltrated from outdoors, however $PM_{10}$ could not because $PM_{10}$ was mainly caused indoors by students' activities. Air cleaners were more effective for removal of $PM_{2.5}$ and $PM_{10}$ in classrooms with a high airtightness than those in classrooms with a relatively low one. Average $CO_2$ in classrooms was about 1500 to 2000 ppm for class hours dependent on the student number per a classroom, which was about 1.5 to 2 times higher than the standard, regardless of the use of air cleaner.
ETCS Level 3 기반 전자연동장치의 기능 및 인터페이스 분석
황경환(Kyung-hwan, Hwang),이기서(Key-seo, Lee),홍정기(Jeong-ki, Hong),성동일(Dong-il, Sung),황청하(Chung-ha, Hwang) 한국철도학회 2019 한국철도학회 학술발표대회논문집 Vol.2019 No.11
본 연구의 내용은 국가R&D 사업으로 추진중인 “자동운전을 지원하는 ETCS L3 급 고속철도용 열차제어시스템 핵심기술 및 궤도회로 기능 대체 기술개발”과제 중 ETCS L3 기반 열차진로제어 기술개발 내용에 관련되는 부분에 대하여 기술하였다. 기존 ETCS L1/L2 전자연동장치(EIS)는 궤도회로를 사용 열차의 위치를 확인하는 방식이나 ETCS L3 기반 전자연동장치는 무선을 통해 열차위치정보를 RBC(Radio Block Center))로 부터 받아 역 구내에서 가상폐색(Virtual Block)방식의 시스템으로 구성한다. 이에 따른 ETCS L3 기반 전자연동장치의 기능 및 주변장치와의 인터페이스 방안을 분석하여 제시하였다. The contents of this study are related to the contents of ETCS L3-based train route control technology development among the "Development of core technology and alternative track circuit function of track control system for ETCS L3 high-speed railway supporting automatic operation" under the national R & D project. As described. Existing ETCS L1 / L2 , Electronic Interlocking (EIS) uses track circuit to check the position of trains, while ETCS L3, Electronic Interlocking receives train position information from the RBC(Radio Block Center) device over the air. It consists of a system of virtual block method. The purpose of this study is to analyze and present the function of ETCS L3 based Electronic Interlocking and interface with peripheral devices.
ETCS L3 안전성 확보를 위한 연동장치와 레일절손검지장치 간 인터페이스 방안
황경환(Kyung-hwan, Hwang),이기서(Key-seo, Lee),홍정기(Jeong-ki, Hong),성동일(Dong-il, Sung),황청하(Chung-ha, Hwang) 한국철도학회 2020 한국철도학회 학술발표대회논문집 Vol.2020 No.7
본 연구의 내용은 국가 R&D 사업으로 추진중인 ‚자동운전을 지원하는 ETCS L3 급 고속철도용 열차제어시스템 핵심기술 및 궤도회로 기능 대체 기술개발‛과제 중 ETCS L3 기반 열차진로제어 기술개발 내용에 관련되는 부분에 대하여 기술하였다. ETCS Level 3 는 기존의 궤도회로를 사용하지 않으므로 궤도회로를 이용한 레일절손검지를 대치할 수 있는 안전시스템이 필요하다. 본 논문에서는 ETCS L3 용으로 개발중인 DAS(Distributed Acoustic Sensing)기반 레일절손검지장치 (DBRD, DAS based Broken Rail Detector)가 EIS 로부터 진로 및 상태정보 등을 수신 받고 EIS 가 DBRD 로부터 레일절손검지 정보를 수신 받아 보다 안전하게 열차진로를 제어하기 위한 인터페이스 방안을 분석하여 제시하였다.