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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.
기계식 증기 압축기에서 디퓨저효과에 대한 수치해석적 연구
정한식(Hanshik Chung),우주식(JusikWoo),라빕(MuhammadNuimLabib),스워노(A. Suwono),정효민(HyominJeong) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
This study presents, the effects of the performance for different diffuser angle has been investigated by CFD methods. The steady numerical simulation using k-omega turbulent model with frozen rotor interface was used for multistage MVC(Mechanical Vapor Compressor) simulation. In this simulation using four section zones and only single passage on each stage is considered to reduce the computational cost and time consuming. This study is just only focused on the effect of angle. From the simulation result shows a good understanding about the optimum angle condition even though using steady simulation.
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.
Numerical simulation of bubble’s Motion in Vertical Tube
Li Xuesong,Hanshik Chung,Hyomin Jeong 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
The problem was derived from a simple process in solar water heating system. In a new designed electro less separated system we involved a kind of bubble pump. Beside experiment analysis, numerical simulation of the core of bubble pump is also very important. In this paper we investigated the motion of bubbles in vertical tube in two dimensions. The heat and mass transfer was simulated. The result of numerical simulation give a significant help of optimize design of bubble pump.
Convective Heat Transfer in Ventilated Space with Various Partitions
Kangyoul Bae,Hanshik Chung,Hyomin Jeong 대한기계학회 2002 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.16 No.5
The laminar convective heat transfer in ventilated space with various horizontal partitions was studied numerically and experimentally. For the numerical study, the governing equations were solved by using a finite volume method for various numbers Re, Gr, Pr and partition numbers. The experimental study was conducted by using a holographic interferometer. The isotherms and velocity vectors have been presented for various parameters. As the number and length of partition ncreased, convective heat transfer decreased. Based on the numerical data, correlation equations were obtained for the mean Nusselt number in term of Gr/Re². In the region of Gr/Re² ≤1, the mean Nusselt number was small, but in the region of Gr/Re²> 1, the mean Nusselt number was constant.
Convective Heat Transfer in Ventilated Space wit=h Various Partitions
Bae, Kangyoul,Chung, Hanshik,Jeong, Hyomin The Korean Society of Mechanical Engineers 2002 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.16 No.5
The laminar convective heat transfer in ventilated space with various horizontal partitions was studied numerically and experimentally For the numerical study, the governing equations were solved by using a finite volume method for various numbers Re, Gr, Pr and partition numbers. The experimental study was conducted by using a holographic interferometer. The isotherms and velocity vectors have been presented for various parameters. As the number and length of partition increased, convective heat transfer decreased. Based on the numerical data, correlation equations were obtained for the mean Nusselt number in term of Gr/Re$^2$. In the region of Gr/Re$^2$$\leq$ 1, the mean Nusselt number was small, but in the region of Gr/Re$^2$> 1, the mean Nusselt number was constant.
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