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액체식 제습시스템용 판형 열교환기식 제습기의 제습 성능에 관한 연구
전동순(Dong-Soon Jeon),문지현(Ji-Hyun Mun),김선창(Seon-Chang Kim),김영률(Young-Lyoul Kim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
본 논문은 판형 열교환기식 제습기의 제습성능에 대한 것이다. 작동유체로서 LiCl 수용액을 사용하였다. 제습량과 제습효율에 대하여 LiCl 수용액의 질량유량 처리공기 상대습도가 미치는 영향에 대하여 연구하였다. 결과로, LiCl 수용액의 질량유량이 증가함에 따라 제습량이 증가함을 알 수 있었다. 또한 처리공기의 입구 상대습도가 클수록, 제습량이 많아지는 결과를 얻었지만, 제습효율은 감소하는 것으로 나타났다. In this study, experimental investigations have been carried out to examine the dehumidification performance of a plate heat exchanger type dehumidifier, LiCl aqueous solution is employed as a working fluid. Effects of mass flowrate of LiCl aqueous solution and relative humidity of process air on the dehumidification rate and effectiveness have been examined. The dehumidification rate increases with the increase in mass flowrate of LiCl aqueous solution. And il is found that the higher the relative humidity of process air, the higher the dehumidification rate. However the higher the relative humidity of process air, the lower the dehumidification effectiveness.
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.
Wilson Plot 방법을 적용한 막 응축용 전열촉진관들의 열전달 및 압력강하 특성비교
전동순(Dong-Soon Jeon),고지운(Ji-Woon Ko),정기문(Ki Moon Jung),김성민(Seong Min Kim) 대한설비공학회 2018 설비공학 논문집 Vol.30 No.7
In this study, experimental investigations were carried out to compare the heat transfer and pressure drop characteristics of enhanced tubes using film condensation. Five enhanced tubes were selected for the performance comparison experiment. The velocity of the coolant ranged from 1.4 m/s to 2.6 m/s. The saturated condensation temperature, fixed at 38℃. R134a and R1234ze(E), were used as refrigerants. The resulting outside and inside heat transfer coefficients were between 11.04 kW/m²·K and 21.30 kW/m²·K and between 10.38 kW/m²·K and 24.69kW/m²·K. The film condensation heat transfer coefficients of R134a showed an average of about 10% higher than that of R1234ze(E). The heat transfer rate of enhanced tube number 4 obtained from the experiment was about 36% higher than that of enhanced tube number 1. This study proposed a performance comparison of enhanced tubes and development of experimental heat transfer correlations for coolant. In the present study, an experimental correlation of the Nusselt number for the coolant was proposed, and this correlation has a ±20% margin of error.
수평 평활관에서 관직경 및 표면 과냉도가 R1234ze(E) 및 R1233zd(E) 막응축 열전달에 미치는 영향
전동순(Dong-Soon Jeon),고지운(Ji-Woon Ko),김선창(Seon-Chang Kim) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.5
HFO refrigerants have recently come to be regarded as promising alternatives to R134a for use in turbo chillers. This study provides results from experiments evaluating the film condensation heat transfer characteristics of HFO refrigerants R1234ze(E) and R1233zd(E) on smooth horizontal laboratory tubes. The experiments were conducted at a saturation vapor temperature of 38.0℃ with surface sub-cooling temperatures in the range of 3~15℃. We observe that the film condensation heat transfer coefficient decreases as surface sub-cooling temperatures increase. In the case of laboratory tubes with a diameter of 19.05 mm, the film condensation heat transfer coefficients of R1234ze(E) and R1233zd(E) were approximately 11% and 20% lower than those of R134a, respectively. Furthermore, our investigation of the effect of tube diameter on film condensation heat transfer coefficients, demonstrates an inverse relationship where the film condensation heat transfer coefficient increases as laboratory tube diameter decreases. We propose experimental correlations of Nusselt number for R1234ze(E) and R1233zd(E), which yield a ±20% error band.
삼중효용 흡수식 냉동기용 배기가스 열 교환기 최적 설계
전동순(Dong-Soon Jeon),고지운(Ji-Woon Ko),김선창(Seon-Chang Kim) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
In this study, optimization design of exhaust gas heat exchanger for triple effect absorption chiller was carried out. In this paper, the exhaust heat exchanger can be applied to 200RT triple effect absorption chiller. Exhaust heat exchanger inlet conditions temperature and mass flow rate is 250℃ and 0.0168 kg/s. LiBr-H₂O inlet conditions temperature and mass flow rate is 111.5℃ and 0.142 kg/s. Target values of exhaust gas outlet temperature was less than 170℃, pressure drop of exhaust gas was less than 5 Pa. Number of tubes, Pt and Lt were selected as Design parameters of exhaust gas heat exchanger. Number of tubes and Pt were selected as main design parameters. As a result, we obtained the 169.9 ℃ of exhaust gas outlet temperature and 2.204 Pa of pressure drop at optimized condition.
판형 열교환기식 제습기에서 LiCl 수용액의 열 및 물질전달 특성
전동순(Dong-Soon Jeon),이해승(HaeSeung Lee),김선창(Seon-Chang Kim),김영률(Young-Lyoul Kim) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.1
Experimental investigations were carried out to examine the heat and mass transfer characteristics of LiCl aqueous solution for a plate heat exchanger type dehumidifier. Cooling dehumidification was adopted vertical type heat exchanger. Also non woven fabric is attached surface of the heat exchanger for spreadability of LiCl aqueous solution. Mass flow-rate of LiCl aqueous solution and concentration were selected as experimental conditions. Also, In this study, the effects of relative humidity of process air and velocity were investigated experimentally. As a result of heat transfer coefficient and mass transfer coefficient of were increased film reynolds number increased. heat transfer coefficient and mass transfer coefficient of LiCl aqueous solution were 0.14~0.24 kW/m2℃ and 1.3×10-63~6.2×10-6 m/s respectively.
고발열 CPU 냉각용 증기 압축식 냉각 시스템의 증발기 최적 설계
전동순(Dong-Soon Jeon),김선창(Seon-Chang Kim),김영률(Young-Lyoul Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
This paper presents optimization design of the evaporator for a vapor compression cooling system with high heat flux CPU. The CPU thermal capacity was given by 300W. Evaporating temperature and mass flow rate were 18 and 0.00182㎏/s respectively. R134a was used as a working fluid. Channel width(CW) and height(CH) were selected as design factors. And thermal resistance, surface temperature of CPU, degree of superheat, and pressure drop were taken as objective responses. Fractional factorial DOE was used in screening phase and RSM(Response Surface Method) was used in optimization phase. As a result, CW of 2.5㎜, CH of 2.5㎜, and CL of 484mm were taken as an optimum geometry. Surface temperature of CPU and thermal resistance were 33 and 0.0502℃/W respectively. Thermal resistance was significantly lower than that of other cooling systems such as a liquid cooling system and a thermosyphon. Therefore, it was found that the evaporator considered in this work have a good performance for a high heat flux CPU cooling.