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정효민(Hyomin Jeong),신용한(Yonghan Shin),사이드(S.M. Sayeed Bin Asad),박진관(Chenkuan Park),정한식(Hanshik Chung) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
LNG(Liquified Natural Gas) must be vaporized to be used as fuel in the industries, home application and soon. The cold energy generated about latent heat of 120 ㎉/㎏ and 80 kca/㎏ of sensible heat, while the vaporization process. Because air type vaporizer can't effect its vaporization performance properly due to the condensation of moisture in air outside the vaporization of moisture in air outside the vaporizer, 2~3 vaporizers are used alternately. To prevent freezing on the surface of vaporizer and solve the low performance, The heating source of gasification will use the geothermal energy. In this study, as the fundamental investigation to develop the highly efficient LNG vaporizer, When cold energy (Heat Flux : -100, -200, -300 W/m2) is connected to the ground, The soil temperature have been investigated numerically by the unsteady heat conduction equation.
사각채널내의 열교환 촉진제의 형상에 따른 영향에 관한 수치해석 연구
정한식(Hanshik Chung),우주식(Jusik Woo),라빕(Muhammad Nuim Labib),전유신(Yousin Chun),정효민(Hyomin Jeong) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
A numerical simulation for studying fluid flow and heat transfer characteristics in a square channels with thermal enhancements are investigated in the present study. The square duct has a length 300㎜ and height 30㎜ square thermal enhancements are attached in the bottom and top walls. The thermal enhancements with different height and shape have been used in the current study. To Calculate the heat transfer, k-omega SST model. The numerical results have also checked with available Theoretical relations Good agreements has achieved.
Experimental Study on Fresh Water Generation System with Low Pressure Evaporation
정한식(Hanshik Chung),위보워(S. Wibowo),리야드(Md. Riyad Tanshen),최주호(Juho Choi),정효민(Hyomin Jeong) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
In this study, experiment of fresh water generation with effect of vacuuming in evaporator was conducted to investigate the effect of various parameters on pressure and temperature distribution inside evaporator, and fresh water or condensed vapor collected from the system. The results of this study show that temperature and flow rateof feed water to the evaporator, and orifice diameter are important factors affecting pressure and temperature inside evaporator, and amount of condensed vapor yield. Varieties of feed water temperature and flow rate are 40-80 0C and 200-400 ㎖/min respectively. From this study shows also that it is possible to use non-conventional energy sources such as lower pressure waste steam for heating feed water to the evaporator of fresh water generation system.
최두열(Duyoul Choi),정한식(Hanshik Chung),정효민(Hyomin Chung),최순호(Soonho Choi),김경석(Kyeongseok Kim),김필환(Pilhwan Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
This study was performed to evaluate the theoretical analysis of the mass balance and heat balance, a single effect desalination process by mechanical vapor compression (MVC), and a set of correlations for evaluation of the thermo-physical property of water. The analysis focuses on prediction of specific power consumption for the vapor compression of the desalination process by mechanical vapor compression. A present study was performed the vapor compression ratio 1.24, the suction steam pressure 31.2 kPa (saturation temperature 343.15 K), and discharge pressure 38.6 kPa (saturation temperature 348.15 K). Finally, comparison of the specific energy consumption of the MVC desalination process and the 5 effect thermal vapor compression (MED-TVC) desalination process was evaluated. The choice between the two systems should be done when plant operating parameter and operating cost is considered
Lubi Rahadiyan,HyoMin Jeong(정효민),HanShik Chung(정한식),김필환 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This study presents characteristics of Eco-Friendly cascade vapor compression refrigeration system, where two non-ODP and low GWP refrigerants of Propane and Ethane were applied at high and low stage system. These refrigerants were charged into the system which is initially designed for R22 and R23 refrigeration system. By varying the amount of refrigerant charged into the high-stage circuit by 0.1800~0.3470 ㎏, temperature, pressure, and power consumption of the system was observed. The most influenced temperature distribution by the variation of high stage refrigerant mass is temperature of cascade evaporator outlet (HS evaporator outlet) and compressor outlet temperature in the high stage circuit. Evaporation temperature in the low stage system decreases as the mass of refrigerant R290 in the high stage increases. Finally, compressor electric power consumption decreases as the mass of the refrigerant in the high stage increase.
2륜 자동차 촉매변환기에 배기가스 온도균일도 특성과 Light-Off에 관한 연구
이중섭(Chungseub Yi),정한식(HanShik Chung),정효민(HyoMin Jeong),박원조(WonJo Park),최병근(ByeongKeun Choi) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
This study represents the flow uniformity and pressure drop in catalytic converter. Present research model type is a monolithic catalytic converter. So, this type have been widely used for satisfaction the regulations of pollutant emissions in automobiles. The mean experimental parameter was engine speed and ceramics monolith in the catalytic converter. The experimental test engine model was used the 124.1㏄ motorcycle engine. The experimental study using thermal imaging method shows the megaphone type model has larger effective area than that of the basic model. The rate of effective area in the basic model is about 8.9 % and the megaphone type model has 41.52%, 34.60%, 33.43%, 25.43%, 17.82% according to the diffuser angle 4°, 8°. In conclusion, the megaphone type monolithic converter has higher efficiency of reducing the pollution with less noise compared to the basic shape and we believe this will be very important as an design guide of the advanced motorcycle.