http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Low GWP 냉매를 적용한 단단 증기 압축식 사이클 성능 특성비교
전동순(Dong-Soon Jeon),고지운(Ji-Woon Ko),문지현(Ji-Hyun Mun),김영률(Young-Lyoul Kim) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
This paper presents the study on a single stage vapor compression cycle using low GWP refrigerants. Also, investigation for the alternative refrigerants was performed. Developed program was used to predict performance of single stage vapor compression cycle according to evaporating and condensing temperatures. This Program included refrigerants(R134a, R410A, R404A, R245fa, R1234yf, R1234ze(E), R1233zd(E), R32). The effects on COP(Coefficient Of Performance) and CR(Compression Ratio) of vapor compression cycle were analyzed according to evaporating and condensing temperature. As a result, it was found that R1233zd(E) refrigerant was a good alternative refrigerant at the evaporating temperature 7.2℃. And R1234yf refrigerant showed good performance when evaporating temperature was –28℃.
전동순(Dong-Soon Jeon),이상재(Sang-Jae Lee),김선창(Seon-Chang Kim),김영률(Young-Lyoul Kim),이창준(Chang-Jun Lee) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.7
This paper presents the optimization process of liquid desiccant cooling system using LiCl aqueous solution as a working fluid. Operating conditions(mass flow rate, conditioner outlet concentration, difference concentration) and design factors for heat exchangers(difference temperature of the district heating water, leaving temperature difference of the conditioner, leaving temperature difference of the regenerator, air temperature difference of the conditioner, air temperature difference of the regenerator) were optimized by response surface method. As a result, we obtained the 7.297 ㎾ of cooling capacity and 0.788 of COP at optimized condition. Effect of difference temperature of hot water on system performances was also examined. As difference temperature of the district heating water increases, the cooling capacity increases and COP decreases.
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.
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.
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.
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.
그루브가 형성된 판형 열교환기식 액체 제습기에서의 열 및 물질전달
전동순(Dong-Soon Jeon),문지현(Ji-Hyun Mun),김선창(Seon-Chang Kim),김영률(Young-Lyoul Kim) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
In this study, experimental investigations have been carried out to examine heat and mass transfer of a grooved plate heat exchanger type liquid dehumidifier. LiCl aqueous solution is employed as a working fluid. Mass flow-rate of LiCl aqueous solution and relative humidity of precess air were selected as experimental conditions. As results of heat transfer coefficient and mass transfer coefficient of LiCl aqueous solution were 0.11∼0.12 ㎾/㎡℃ and 11.2×10 ̄?~17.8×10 ̄? ㎧ respectively.