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노광철(Kwang-Chul Noh),오명도(Myung-Do Oh) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The numerical study was performed for the comparison of ventilation performance with variations of indoor momentum source. CO₂ concentration and local mean air-age of the room were calculated with respect to the intensity and the location of momentum source, occupancy and methods of room air diffusion. The numerical results showed that ventilation performance of the room was strongly affected by methods of room air diffusion. Their maximum difference of CO₂ concentration between a mixing system and a displacement one was about 300ppm in the occupied zone of the same-sized room. And we found out that ventilation performance is getting better or worse with variations of the intensity and the location of momentum source. It is due to that the intensity and the location of momentum let the residence time of air be longer or shorter in the room.
코로나 방전 방식에 따른 전기집진기의 오존, NO<sub>x</sub> 발생 및 입자제거 특성
노광철,이영호,오명도,Noh, Kwang-Chul,Lee, Young-Ho,Oh, Myung-Do 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.10
We investigated the amount of the toxic gases emitted from the Electrostatic Precipitators(ESPs), which are currently used as the indoor air cleaners. The existing wire-to-plate(WTP) and neddle-to-plate(NTP) types of ESP designs are considered as the experimental corona dischargers. Using the voltage, the polarity of wire, the number of needles of NTP as the input variables, we studied the generation characteristics of ozone and $NO_{x}$ and the particle removal efficiency in the ESPs. As the results, we found out that the concentration of ozone, $NO_{2}$ and $NO_{x}$ is increased with increasing the voltage and the number of needles, but the amount of NO is decreased. And we observed that the generation rates of ozone and $NO_{x}$ are mainly related with the corona region through the photographs. Finally the experimental results showed that the particle removal efficiency of ESP with WTP type charger is more superior to that with NTP type chargers at the same voltage.
노광철(Kwang-Chul Noh),황정호(Jungho Hwang),오명도(Myung-Do Oh),이승철(Seung-Chul Lee) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
Cleanrooms are common facilities in IT, pharmaceutical, and food industries, and hospitals. Cleanrooms are 10 to 100 times as energy intensive as office buildings. Therefore, it has become an important issue to reduce cleanroom energy consumption. The energy consumed by fans account for a large portion of cleannrom energy use. In recirculation systems, pressurized plenum design is estimated to be more energy efficient than FFU or ducted HEPA design. In FFU design, which has been used in most industrial cleanroom of Korea, increase up to 70% in the energy efficiency of FFU is needed in order to reach a similar level of the energy use in pressurized plenum design. It is apparent that reduction in airflow rates of outdoor intake air and exhaust air leads to saving the fan energy use related with the make-up air system.
노광철(Kwang-Chul Noh),이영호(Young-Ho Lee),오명도(Myung-Do Oh) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
We investigated the amount of the toxic gases emitted from the Electrostatic Precipitators(ESPs), which were<br/> currently used by indoor air cleaners. We used the wire-to-plate(WTP) type and the needle-to-plate(NTP) type<br/> corona discharger in our study. Using the voltage, the polarity of wire, the number of needles of NTP as the<br/> input variables, we studied the characteristic of Ozone and NOx generation in the ESPs. As the results, we<br/> found out that the concentration of Ozone, NO2 and NOx is increased, but the amount of NO is decreased<br/> with increasing the voltage and the number of needles. And we knew that the generation rate of ozone and<br/> NOx is very related with the corona region.
학교건물에서 냉방부하에 따른 열적 쾌적성 평가지표 비교 연구
노광철(Kwang-Chul Noh),오명도(Myung-Do Oh) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
We performed the numerical study on the comparison of thermal comport performance indices for cooling loads in the classroom when the 4-way cassette air-conditioner is mounted on the ceiling. We investigated the velocity and the temperature distribution of the classroom as with respect to the variation of the air diffusion angle of the air-conditioner. Air diffusion performance index and Predicted mean vote were used for analyzing the characteristics of the thermal comport in the classroom and comparing their values each other. From the numerical results, we knew that the thermal comport is largely affected by the air diffusion angle and velocity of the air-conditioner. And we also found out that the qualitative tendency of the distribution between Air diffusion performance index and Predicted mean vote is very similar in all occupied zone.
광식각공정 클린룸에서의 기류 및 교차오염에 대한 수치적 연구
노광철(Kwang-Chul Noh),이승철(Seung-Chul Lee),오명도(Myung-Do Oh) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
We performed the numerical study on the characteristics of the airflow and cross contamination in<br/> the photolithography process cleanroom. The nonuniformity, the deflection angle and the global cross<br/> contamination were used for analyzing the characteristics and performances of cleanroom. We knew that<br/> the airflow characteristics of the cleanrooms are largely affected by the porosity of panel and the<br/> adjustment of dampers. And the numerical result showed that the global cross contamination varies with<br/> the location of source and the passage of time.
열쾌적성과 국소환기지수를 고려한 에어컨 냉기 최적 토출각도에 대한 수치적 연구
노광철(Kwang-Chul Noh),오명도(Myung-Do Oh) 한국실내환경학회 2005 한국실내환경학회지 Vol.2 No.1
We performed numerical analyses on the optimal discharge angle of a 4-way cassette air conditioner, which is mounted on the ceiling of the classroom, by using thermal comfort and ventilation indices. We analyzed the effective draft temperature, the local mean age and the local mean residual life time withrespect to the variation of the air discharge angle of the air conditioner in all occupied zone. Air diffusion performance index, local supply effectiveness and local exhaust effectiveness were used to investigate the optimal value of air discharge angle. From the results, we found out that the optimal discharge angle of the air conditioner is about 40 degrees in the present model.