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정체점 입자유동에서 복사열전달을 고려한 열영동 입자부착 연구
정창훈,이공훈,최만수,이준식,Jeong, Chang-Hun,Lee, Gong-Hun,Choe, Man-Su,Lee, Jun-Sik 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.5
A study of thermophoretic particle deposition has been carried out for a particle laden stagnation flow considering the effect of radiative heat transfer. Energy, concentration and radiative transfer equations are all coupled and have been solved iteratively assuming that absorption and scattering coefficients were proportional to the local concentration of particles. Radiative heat transfer was shown to strongly affect the profiles of temperature and particle concentration. e. g., radiation increases the thickness of thermal boundary layer and wall temperature gradients significantly. As the wall temperature gradients increase, the particle concentration at the wall decreases due to thermophoretic particle transport. The deposition rate that is thermophoretic velocity times particle concentration at the wall decreases as the effects of radiation increases. The effects of optical thickness, conduction to radiation parameter and wall emissivity have been determined. The effects of anisotropic scattering are shown as insignificant.
정창훈(Jeong Chang-Hun),송호산(Song Ho-San) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
Tall buildings are easily affected to drift laterally by horizontal loads like wind and seismic. Thus, the main point of structural design of tall buildings is to control its lateral drift effectively. However, there are thousands of structural members which are compounded together into tall buildings. So it is hard task to analyse and design tall buildings in conventional ways. In a effort to improve conventional trial-and-error design methods that depends on structural engineer"s experience and intuition. This study presents a formulation for optimal design of tall buildings. A full-scales 30 story three-dimensional Dual system building is presented to illustrate the effectiveness and efficiency of the optimal design technique.
막분리와 저온 냉각분리를 이용한 혐기성 소화가스로부터 온실가스 회수저감 기술
황철원 ( Cheol-won Hwang ),정창훈 ( Chang-hun Jeong ) 한국환경기술학회 2013 한국환경기술학회지 Vol.14 No.3
혐기성 소화 작용에 의해 발생되는 바이오가스의 에너지원으로 사용은 온실가스 감축과 신재생에너지 보급 확대에 기여할 수 있다. 바이오가스의 에너지 함량은 직접적으로 메탄농도에 비례하며, 이산화탄소와 불순물 함량을 감소시킴으로써 고질가스로 이용이 가능하다. 본 연구에서는 환경 기초시설에서 발생되는 부생가스로부터 이산화탄소와 메탄 등의 온실가스를 회수하기 위한 혼성분리 공정(막분리+저온 냉각분리)을 개발하였다. 막분리 공정과 저온 냉각분리 공정의 성능평가 결과를 바탕으로 소화가스를 이용한 혼성분리 공정의 최적 운전시 메탄의 회수농도를 높이기 위해 1단계 분리막의 투과측을 감압하였으며, 메탄의 회수율을 높이기 위한 방법으로 2단계 분리막의 투과 가스와 저온 냉각분리 공정의 출구 가스를 1단계 분리막의 공급 유량으로 재순환시키는 방법을 사용하였다. 감압 및 재순환을 포함한 혼성분리 공정에서 메탄의 회수농도와 이산화탄소의 회수농도는 각각 94.3%와 99.5%였으며, 메탄의 회수율과 이산화탄소의 회수율은 각각 99.8%와 90.9%를 나타내었다. The potential of using the biogas as energy source is widely recognized. It is considered an important future contributor to the energy supply, although upgrading is needed. Biogas upgrading can be achieved after removing the CO<sub>2</sub> and contaminants. The main objective of the present research was CH<sub>4</sub> and CO<sub>2</sub> recovery from biogas generated in municipal wastewater treatment plant. Hybrid pilot plant(membrane + low-temperature separation process) for upgrading biogas was constructed and operated at a municipal wastewater treatment plant. The raw biogas contained 66 ~ 68 Vol % CH<sub>4</sub>, the balance being mainly CO<sub>2</sub>. The CH<sub>4</sub> concentration in the retentate stream was raised in field tests to 94.3 Vol % CH<sub>4</sub> and the CH<sub>4</sub> recovery efficiency was 99.8%. At the same time, the CO<sub>2</sub> recovery concentration and efficiency was 99.5% and 90.9%, respectively.
분리막을 이용한 혐기성 소화가스로부터 온실가스 회수저감 기술
황철원 ( Cheol Won Hwang ),정창훈 ( Chang Hun Jeong ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.10
The main objective of this experimental investigation was CH4 recovery from biogas generated in municipal and wastewater treatment plant. The polysulfone hollow fiber membrane was prepared in order to investigate the permeation properties of CH4 and CO2. Permeability of CO2 in Polysulfone membrane was 11-fold higher than of CH4 gas. A membrane pilot plant for upgrading biogas was constructed and operated at a municipal wastewater treatment plant. The raw biogas contained 66 ~ 68 Vol % CH4, the balance being mainly CO2. The effect of the operating pressure of feed and permeate side and feed flowrate on CH4 recovery concentration and efficiency were investigated with double stage membrane pilot plant. The CH4 concentration in the retentate stream was raised in these tests to 93 Vol % CH4.