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판형 열교환기를 적용한 조수기의 성능 및 유동분포에 대한 연구
김진화(Zhenhua Jin),최두열(Duyoul Choi),최순호(Soonho Choi),정한식(Hanshik Chung) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.10
Plate Heat Exchanger (PHE) have become popular in chemical, power, food and refrigeration industries due to the efficient heat transfer performance, extremely compact design and flexibility of extend or modify to suit changed duty. In present work, PHE aimed apply in the fresh water generator which installed in ship to desalinate seawater to fresh water use heat from engines. The experiment is proceeded to investigate the heat transfer between cold and hot fluid stream at different flow rate and supply temperature of hot fluid. Another target is the generated fresh water as outcome of the system. PHE is an important part of a condensing or evaporating system. One of common assumptions in basic heat exchanger design theory is that fluid is to be distributed uniformly at the inlet of each fluid side and throughout the core. However, in practice, flow mal-distribution is more common and can significantly reduce the heat exchanger performance. The main objective of this paper is discussing main conception of plate heat exchanger and applied in vacuum evaporator for product fresh water.
이젝터를 사용한 혼합 시스템에서의 기-액 혼합특성에 관한 연구
김진화(ZhenHua Jin),토니 우토모(Tony Utomo),이용훈(YongHun Lee),지명국(MyoungKuk Ji),정한식(HanShik Chung),정효민(HyoMin Jeong) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The purpose of this study is further research to achieve deeper understanding about mixing system using gas-liquid ejector. First investigate the influence of operating conditions and geometricalparameters on the hydrodynamics and mass transfer properties of mixing system. This paper provides a literature review on the ejector applications in mixing system. A number of researches are grouped and discussed in several topics such as background, theory of ejector, mixing characteristics, optimization of the system. Since the high efficiencies reactor using ejector are widely used in gas-liquid system, especially in chemical and biochemical processes. This is also due to the high efficiency in gas dispersion resulting in high mass transfer rate and low power requirements. Circulation and gas dispersion are achieved when the liquid injected into reactor with high velocity which entrain the gas phase and create a fine dispersion of the two phases.
Thermal Properties Analysis for LNG from Various Product Regions
Jin Meihua(김미화),Jin Zhenhua(김진화),Youngjin Kim(김영진),Hanshik Chung(정한식),Hyomin Jeong(정효민) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Liquefied natural gas or LNG is natural gas that has been converted to liquid form for ease of storage or transport. Liquified natural gas takes up about 1/600th the volume of natural gas at a stove burner tip. In this paper , we will list the properties of LNG at the scope of pressure and temperature from 80 bar to 130 bar, 108.15 K to 328.15 K. Main properties are density, heat capacity, entropy, conductivity, enthalpy, sound speed, viscosity, which are highly depended on pressure and temperature. To compare the difference between varies product region, we choose Alaska, Alaska Brunei abdai Indonesia Malaysia Oman Kartar, except Alaska other region LNG have slightly different percentage of component.
온도 변화에 따른 기포펌프의 수직관내 이상유동과 성능특성
이광성(Kwangsung Lee),김진화(Zhenhua Jin),김미화(Jin Meihua),정효민(Hyomin Jeong),정한식(Hanshik Chung) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
A study on the two-phase flow and performance characteristics in the tube according to temperature in bubble pump system presented in this paper. For the experimental facilities composed of electrical heater used for provide heat source to generate bubble, a vertical tube with diameter of ?8㎜, length of 500㎜, Storage tank with capacity of 40Liter and heat exchanger. The separator and condenser of the air bubble pump were installed separately. As results, air bubble occurred within 50~60 ℃ but it was stagnate in the tube no moving. However, the heating temperature maintained within 70~80℃ then bubble flow occurred and flowing to upward. Consequently, from 80℃ temperature condition the slug flow happened and the flow velocity located within 7.69~14.28 ㎝/sec and the thermal amount of storage tank as 9280㎉.
Study on the Flow Characteristics in the Channel with Corrugated Wall
YongHan Shin(신용한),ZhenHua Jin(김진화),S. Wibowo(위보워),Li XueSong(이설송),HanShik Chung(정한식),HyoMin Jeong(정효민) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
In this paper, presented pressure drop characteristics in a channel of plate heat exchanger by experimental method. Plate Heat Exchanger(PHE) have become popular in chemical, power, food and refrigeration industries due to the efficient heat transfer performances, extremely compact design and flexibility of extend or modify to suit changed duty. In the experiment, test section constructed by two corrugated plates with 60 degree of chevron angle. Consequently, experiments carried out the pressure profile along 15 measure points according to mass flow rate. This results provided to investigate flow characteristics of PHE channel flow that highly turbulent even with low Reynolds number. Moreover, numerical simulation was compared with experimental results and present flow behavior in the test section.
태양열 온수기 시스템에 적용된 기포펌프의 성능평가에 대한 연구
이광성(Kwangsung Lee),이설송(Li Xuesong),김진화(Zhenhua Jin),정효민(Hyomin Jeong),정한식(Hanshik Chung) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
In this paper, study on performance analysis of bubble pump on the domestic solar water heater system is presented. Device of this experiment is consisted of bubble pump, solar collector and heat exchanger. At the mean time, this system have attached temperature sensors and pressure sensors at bubble pump. In addition, the flow meter was installed at outlet of heat exchanger. And then result of experimental study, average value of the heat exchange amount in heat exchanger was about 7.9㎉/hr, the maximum value of the heat amount in water tank(0.4㎥) was 489.7㎉/hr and the maximum value of the mass flow rate in bubble pump was about 0.5 ℓ/min.