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오명도,유경훈,이준식 대한기계학회 1994 대한기계학회논문집 Vol.18 No.2
From a theoretical analysis point of view, the 2-stage precipitator is decomposed into two units: charging cell and collecting cell. Collection efficiency predictions of the two-stage parallel-plate electrostatic precipitator have been performed theoretically incorporating with the charging and the collecting cells. Particle trajectorise passing the charging cell have been modeled as a simple one. Particle charge distribution at the outlet of the charging cell is calculated through integration of the present unipolar combined charging rate along the entire particle trajectory, and average charge of particles at the outlet of the charging cell is obtained from the particle charge distribution. As for the collecting cell, the diminution of particle concentration along the longitudinal direction of the collecting cell is investigated considering the conventional Deutsch's theory and the laminar theory. One should note that the collection efficiency formula derived is based on monodisperse aerosols. It has been confirmed through the analysis that predictions of particle charge by applying White's unipolar diffusion charging theory overpredict actual cases in the continuum regime, while predictions by Fuch's unipolar diffusion charging theory indicate the reasonable result in the same regime. Theoretical predictions of collection efficiency are also compared with the available experimental results. Comparisons show that the experimental results are consistently located in the collection efficiency region bounded by the two limits, the Deutsch and the laminar collection efficiencies. Finally design parameters of the 2-stage electrostatic precipitator have been investigated systematically through the one-variable-at-a-time method in terms of collection efficiency. Applied voltages on the corona wire of the charging cell and the plate of the collecting cell, and the average air velocity have been selected as the design parameters.
공랭형 병렬방식 2중효용 흡수식 냉방시스템의 사이클 해석
오명도,김선창,김영인,이홍원 대한기계학회 1993 대한기계학회논문집 Vol.17 No.8
A gas-fired 4RT absorption heat pump was designed as an air-conditioner for domestic use during the summer. The absorption heat pump is air-cooled. double-effect, $LiBr-H_{2}O$ system with parallel flow type. The performance of the absorption heat pump in the cooling mode of operation was investigated through cycle modeling and simulation to obtain the system characteristics with parameter changes. System parameters considered in this analysis were the inlet temperature of cooling air to the absorber, the working solution concentrations, the ratio of the amount of the weak solution from the absorber, and the LTD's of each heat exchange component. The optimum designs and operating conditions were determined based on the operating constraints and the coefficient of performance.
오명도,배태식,김선창,Oh, M.D.,Bae, T.S.,Kim, S.C. 대한설비공학회 1992 설비공학 논문집 Vol.4 No.2
Experimental study on air ionization phenomena has been conducted to analyze the propagation behavior and dischargeability of polarity air ions under the super clean room environments with the operation of prototype of Air Ionization System. Varying humidity and air velocity, the distribution of air ion density and the discharge time are measured and analyzed.
수냉형 직렬방식 2중효용 흡수식 냉방기의 열해석과 최적 설계
오명도,김영률,김선창,김영인,Oh, M.D.,Kim, Y.L.,Kim, S.C.,Kim, Y.I. 대한설비공학회 1992 설비공학 논문집 Vol.4 No.4
An absorption heat pump cycle has been modeled and simulated to analyze the system performance of water-cooled, series-flow, double-effect absorption heat pump, which can be applied to a direct gas fired cooling system with the medium range of cooling capacity (15RT level). Effect of absorption cooling system parameters, such as concentration difference, inlet temperature of cooling water, 1st generator temperature, leaving temperature differences of condenser and evaporator and efficiency of solution heat exchanger, has been investigated in the view of system cooling performance.
오명도,박기림 서울시립대학교 산업기술연구소 1999 산업기술연구소논문집 Vol.7 No.-
The design criteria for ventilation requirements of a longitudinal road tunnel were investigated and the control volume method was applied to calculate the local air velocity and the local concentration distribution of pollutants, CO, NOx, soot along the tunnel for various tunnel ventilation system.