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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.
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.
판형열교환기 Chevron각 변화에 따른 유동현상 수치해석
정효민(Hyomin Jeong),김성수(SeongSoo Kim),정한식(HanShik Cheng),전유신(YouSin Chun),최현근(HyunGun Choi) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
Numerical analysis was carried out to examine the heat transfer and pressure drop characteristics of Plate Heat Exchanger(PHE) for absorption using Computational Fluid Dynamics(CFD) techniques. The Thermal performance and pressure drop are investigated. The computational model is a tree-dimensional narrow channel with angled triangular undulations. Geometric condition of PHE was port size 25㎜, channel plates area 3,465 ㎟. The main operating conditions in PHE, were taken a various Reynolds munber(from 1000 to 8000). The optimum flow pattern were presented with variation of pressure drop.
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.
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 자동차용 세라믹 촉매변환기내 압력특성과 유동균일도에 관한 수치해석
이중섭,이용훈,정효민,정한식,Yi, Chung-Seub,Lee, Yonghun,Jeong, Hyomin,Chung, Han-Shik 대한기계학회 2007 大韓機械學會論文集B Vol.31 No.4
This research represents the catalytic converter for application in the motorcycle. We have to consider about catalytic converter for reducing exhaust gas strength regarding the displacement volume enlargement. The catalytic converter has been widely used to satisfy the regulations of pollutant emissions from automobiles. Recently, all catalytic converter researches are about automobile. Study about motorcycle catalytic converter has not been conducted yet. In this study, flow uniformity and pressure distribution were simulated in the monolithic inlet of catalytic converter for motorcycle. Exhaust pulsation pressure was set as transient condition about. It was found that flow uniformity shown in base model (0.85) was lower than megaphone model (0.98).
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.
기화방열식 Cool Roof Fan의 냉풍효과에 대한 연구
김영식(Yeong Sik Kim),정한식(Hanshik Chung),정효민(Hyomin Jeong),최순호(Soon-Ho Choi) 대한기계학회 2016 大韓機械學會論文集B Vol.40 No.3
환기는 자연환기와 강제환기로 분류되며, 최근에는 하절기에 작업장의 환경개선을 위해 냉각된 공기를 공급하는 환기를 적용하는 경우가 많아지고 있다. 하지만 대규모의 작업장에 냉각된 공기를 공급하기 위해서는 많은 에너지가 필요하며, 이를 보완하기 위해 물의 증발열을 이용하여 공기를 냉각시킨 후 공급하는 환기장치의 도입사례가 증가하고 있으며, 본 실험연구는 부산의 모 신발공장에 실제 적용된 기화방열식 환기장치의 성능을 평가한 사례연구로서 하절기에 외부의 대기온도에 대해 어느 정도의 냉각능력을 구현할 수 있는지 측정하였다. 실험결과로부터 하절기에 약 6~7 ℃ 정도의 냉각효과를 구현하지만 급기의 상대습도가 매우 높아짐을 정량적으로 측정할 수 있었다. 실험결과에 의하면 기화방열식 전체환기 설비가 타방식과 비교하여 작동방식이 단순하며, 에너지 소비가 적은 경제적인 냉각설비이며, 급기의 습도 제어기능만 부가되면 매우 효율적인 환기 - 냉각기능을 동시에 수행할 수 있는 설비임을 확인하였다. The ventilation effect of a ventilation system, which is classified as the forced ventilation and natural ventilation, is predominantly dependent on the combination of air supply and discharge. Perhaps the simplest ventilation is merely supplying the air as it is. However, to improve the indoor working environment during the summer, an air supply that is cooled to some extent has been widely adopted. Recently, a cooling method utilizing the vaporization of water was introduced. In this study, the performance of an evaporation-type air supply unit that was produced by Japan K-company and was installed in a shoe-manufacturing plant in Busan was investigated. The purpose of the experiment was to measure how much the supplied air could be cooled. From this experimental study, we confirmed that the evaporation-type air supply system is efficient, capable of improving the working environment during the summer while minimizing the energy cost.