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고지운(Ji-Woon Ko),전동순(Dong-Soon Jeon) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
In this paper, an experimental study was conducted on the performance characteristics of a packed-bed type liquid dehumidifier. The object of this study is to find out the characteristics of the dehumidifier analytically according to the variations of relative humidity and velocity of the process air. The liquid desiccant used in the experiment are aqueous lithium chloride(LiCl) solution. As results, dehumidification rate increases with an increase in velocity and relative humidity of process air, but effectiveness of dehumidification decreases. The dehumidification rate was about 12.39 ~ 34.06 g/min and effectiveness of dehumidification was 18.75 ∼ 33.64%.
전동순(Dong-Soon Jeon),고지운(Ji-Woon Ko) 대한설비공학회 2020 설비공학 논문집 Vol.32 No.5
In this study, numerical analysis investigations were conducted on the design optimization of a heat exchanger for the cooling of a power generator. A heat exchanger using coolant was selected after investigating the suitability of cooling methods applicable to power generator cooling. The fractional factorial design of the experiment and response surface method were used for the optimization process. Minitab and Design Experts, which are statistical programs, were used to establish the analysis conditions and analyze the results. The heat transfer rate of the heat exchanger, the pressure drop of the coolant, and the efficiency of the heat exchanger were selected as the heat exchanging performance index. The first optimization step was conducted to derive the main design factors that could influence the heat exchanging performance. The main derived design factors were the width and height of the heat exchanger channel and the volumetric flow of the coolant. The second optimization step was conducted to optimize the main design factors derived in the first optimization step. Although the pressure drop somewhat increased compared to the standard condition, the heat transfer rate and efficiency increased by 1.15 kW and 6.28%, presenting the optimized heat exchanger shape and conditions.