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Shell & Tube Type 열교환기의 전산지원설계에 관한 연구
홍성희(S.H.Hong),윤석훈(S.H.Yoon),김종헌(J.H.Kim) 한국해양대학교 해사산업연구소 1996 海事産業硏究所論文集 Vol.5 No.-
Up to now, the shell and tube type heat exchanger are applied as a typical heat exchanger in power plant and refinery system. It is very difficult to calculate the expected performance characteristics of the shell and tube type heat exchanger, because there are many design parameters to be considered according to internal structure and the shell side heat transfer mechanism complicatedly related to the design parameters. Design parameters to be considered in the design stage of the shell and tube type heat exchanger are shell and tube side fluids, flow rate, inlet and outlet temperature, physical properties, type of heat exchanger, outer diameter, thickness, length of tube, tube arrangement, tube pitch, permissive pressure loss on both sides, type of baffle plate, baffle plate cutting ratio, clearance between baffle plate outer diameter and shell inner diameter, clearance between baffle plate holes and tube outer diameter. The basic purpose of this study is to develop a computer aided design program reflecting the characteristics of parameters. Finally, overall heat transfer coefficient and pressure drop calculated by the developed computer program were reviewed as per experimental data and in addition to that, relation between overall heat transfer coefficient and fouling resistances & film coefficients of shell and tube sides was simulated.
박대식,윤석훈,김명환,이영호,오철,Park, D.S.,Yoon, S.H.,Kim, M.H.,Lee, Y.H.,Oh, C. Korean Society of Marine Engineers 2001 한국마린엔지니어링학회지 Vol.25 No.4
This study was experimentally performed to investigate freezing behavior of sea water along horizontal cooled a circular tube with bubbly flow. The experiments were carried out for a variety of parameter, such as sea water velocity, air-bubble flow rate, and cooled-tube temperature. The shape of freezing layer, freezing rate and salinity of frozen layer were observed and measured. And the flow patterns around cooled tube were visualized using the PIV to analyze the relationship between the flow structure and the freezing characteristics. It was found that the experimental parameters gave a great influence on the freezing rate and the salinity of the frozen layer.
핀-튜브 열교환기에서의 습증기 발생 메커니즘의 파악을 위한 실험적 연구
박상균,윤석훈,김경근,김명환,오철,Park, S.K.,Yoon, S.H.,Kim, K.K.,Kim, M.H.,Oh, C. 한국마린엔지니어링학회 2001 한국마린엔지니어링학회지 Vol.25 No.3
As an improvement in the standard of living and economic growth, the demand for air conditioning equipment is increasing rapidly. Nowadays, air conditioning equipments are being used for industry, large building, house and car. There equipments were concentrated on improving heat efficiency of economic aspects while thy design heat exchanger for cooling and heating. These air conditioning equipments using heat exchanger cause a discomfort to user due to generating mist at the beginning of operating. Therefore, the user demand air of high class and quality. In this experimental study, to acquire elementary data for development of heat exchanger which be able to supply air of high quality, that is to say, possess a restraint effect of mist generation. We estimate an effect on cooling plate quality, supply air velocity, supply air temperature, cooled plate temperature and supply air relative humidity which have an influence on outlet air condition of heat exchanger.
윤두호,오철,윤석훈,Yoon, D.H.,Oh, C.,Yoon, S.H. 한국마린엔지니어링학회 2000 한국마린엔지니어링학회지 Vol.24 No.5
In this paper, experiments investigating the high-temperature region heat transfer coefficients for the spray cooling of hot flat plates were performed by down spray water using flat spray nozzles. The heat transfer surface is made of copper and is 100mm in length and 40mm in width and 15mm in thickness. The experimental condition of spray are as follows: temperatures of the water droplets are T=20~$80^{\circ}C$ and droplets volume fluxes are D=0.001565~0.010438$m^3/m^2s$. Next, correlating equations for the heat transfer characteristics of spray cooling in the high temperature region are developed from the effects of droplets volume flux and the surface temperature of heat transfer plate.
고온 열전달면의 각도에 따른 분무냉각 특성에 관한 연구
윤두호,오철,윤석훈,Yoon, D.H.,Oh, C.,Yoon, S.H. 한국마린엔지니어링학회 2002 한국마린엔지니어링학회지 Vol.26 No.3
An experimental study of heat transfer from hot flat surface to water sprays was conducted in high temperature region. Heat transfer measurements for hot flat surface were made by 4 sheathed C-A thermocouples. Droplets volume flux were also measured-independently at a position in spray field. The test conditions included variations in droplets volume flux, subcooling of cooling water of $1.565\times10^{-3} to 14.089\times10^{-3}m^3/m^2s and 80 to $20^{\circ}C$ respectively. The effects of inclination angle on heat transfer were investigated and changes in inclination angle of hot flat surface affected heat transfer coefficients of high temperature region.
김명환,김철환,오철,윤석훈,김경근,Kim, M.H.,Kim, C.H.,Oh, C.,Yoon, S.H.,Kim, K.K. 한국마린엔지니어링학회 1994 한국마린엔지니어링학회지 Vol.18 No.5
The two-phase flow is observed in power plants, chemical process plants, and refrigeration systems etc., and it is very important to solve the heat transfer mechanism of a boiler, an automic reactor, a condenser and various types of evaporators. Recently, the problem of two phase heat transfer is braught up in many regions with development of energy saving technique. In flow boiling system it is necessary to store data in each condition because the heat transfer characteristics of flow boiling region vary by the change of flow pattern and the magnetude of heat flux to tube length, and be subtly affected by the flow and heating condition. So basic study for knowing flow pattern in heat transfer region and the relation between heat transfer characteristic and flow condition is desired to accumulate data in wide variety of liquid and flow system in the study of heat transfer of two phase flow. In this study R-113 was selected as working fluid whose properties were programmed by least square method, and experiment was conducted in the region of mass flow $1.628{\times}10^6$~$4.884{\times}10^6$/kg/$m^2$hr with inlet subcooling 10~3$0^{\circ}C$, sustaining test section inlet pressure to 1.5kg$_f$/$cm^2$abs.
타원형 핀-관 열교환기의 유동 및 열전달 특성에 관한 연구
최영규(Y.G.Choi),김정식(J.S.Kim),윤석훈(S.H.Yoon),김명환(M.H.Kim),오철(C.Oh) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
Fluid & Heat transfer characteristics are have to study for efficiency improvement of fin-tube heat exchangers. So this numerical study is used 3-dimensional program to analyze and compare fin-tube exchangers with oval-tube. Fluid & heat transfer characteristics are analyzed about each aspect ratio 1.0, 0.75. 0.5 in a flat fin and tube heat exchanger. In the fluid pressure is dropping down and heat transfer coefficient is improve by using oval tube. Pressure drop is able to improve efficiently by installing oval tube.