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[論文] Fin Assembly에서의 2次元 熱傳達 解析
서정일(J.I.Seoh),조진호(J.H.Cho),조종철(J.C.Jo),강희영(H.Y.Kang) 한국자동차공학회 1984 오토저널 Vol.6 No.1
<br/> The conventional heat transfer analysis methods based on the one-dimensional theory are not adequate to be applied for the purpose of finned surface design because the two-dimensional<br/> effects in fact are induced within the supporting wall by the presence of the finnes.<br/> In this study, the two-dimensional heat transfer of a straight fin assembly is analyzed by using the integral method.<br/> It is shown that all the effects of the system parameters i.e., the heat transfer parameters and geometrical parameters, on both the total heat transfer rate and the surface temper<br/> ature effectiveness can be seen from the present analysis. The optimum combinations of these parameters for the design of finned surfaces may be estimated.
[論文] 엔진速度와 負荷가 디젤 排氣가스에 미치는 影響에 關한 硏究<br/> [論文] 엔진速度와 負荷가 디젤 排氣가스에 미치는 影響에 關한 硏究
이재순(J.S.Lee),김승무(S.M.Kim),신용재(Y.J.Shin),서정일(J.I.Seoh) 한국자동차공학회 1982 오토저널 Vol.4 No.2
<br/> Smoke, Hydrocarbon and Carbon Monoxide emissions of concern in environmental pollution on AVDS-1790_2D diesel engine were studied experimentally and past studies on emissions of diesel engine were investigated.<br/> Engine speed and load were considered as variable factors influencing the emissions. The test results of a multicylinder, direct injection and turbocharged 4 cycle diesel engine were compared with past studies. Both emission levels of experimental study and past studies were markedly influenced by engine operation factors.<br/> The results obtained in this study can be summerized as follows;<br/> 1) Smoke intensity is proportional to engine load and varies with engine speed.<br/> 2) Hydrocarbon and nitric oxides emissions vary with engine speed and load.<br/> 3) Carbon monoxide emission is insensitive to engine speed and varies with engine load.
서정일,임장순,이재헌,박만흥,Seoh J. I.,Yim J. S,Lee J. H.,Park M. H. 대한설비공학회 1982 설비저널 Vol.11 No.3
The heat transfer process with boiling on a fin cannot be treated in a conventional manner of assuming a constant heat transfer coefficient. This report proposes a simplified method for determining fin performance. The heat transfer coefficients in boiling region is approximated by n ty power function of superheat. The results yield the temperature gradient as a function of superheat, fin width, and thermal conductivity of the fin. Computed results for water boiling on fin compare favorably with those obtained from a small-increment numerical solution.
태양열 난방시스템 해석을 위한 전산시뮬레이션 모델의 개발
이영수,서정일,Lee Y. S.,Seoh J. I. 대한설비공학회 1987 설비저널 Vol.16 No.1
This research, through the analysis of existing programs, presents a simplified logical program which can show the thermal performance of a system, based only on hourly weather data and the system design data. This program is applicable for analyzing a system of direct heating or recirculation heating which may enhance the performance of an existing solar house. Using these system in the existing systems a little raise in performance. The model analysis of a $100\;m^2$ solar house in the seoul region shows that the following figures are the most efficient and suitable; 1. Installation an81e of collector: $45^{\circ}$ 2. Collector size: $34.56\;m^2$ 3. Capacity of main storage tank: $25\;m^3$
Subchannel analysis of a small ultra-long cycle fast reactor core
Seo, H.,Kim, J.H.,Bang, I.C. North-Holland Pub. Co 2014 Nuclear engineering and design Vol.270 No.-
Thermal-hydraulic evaluation of a small ultra-long cycle fast reactor (UCFR) core is performed based on existing safety regulations. The UCFR is an innovative reactor newly designed with long-life core based on the breed-and-burn strategy and has a target electric power of 100MWe (UCFR-100). Low enriched uranium (LEU) located at the bottom region of the core play the role of igniter to operate the UCFR for 60 years without refueling. A metallic form is selected as a burning fuel region material after the LEU location. HT-9 and sodium are used as cladding and coolant materials, respectively. In the present study, MATRA-LMR, subchannel analysis code, is used for evaluating the safety design limit of the UCFR-100 in terms of fuel, cladding, and coolant temperature distributions in the core as design criteria of a general fast reactor. The start-up period (0 year of operation), the middle of operating period (30 years of operation), and the end of operating cycle (60 years of operation) are analyzed and evaluated. The maximum cladding surface temperature (MCST) at the BOC (beginning of core life) is 498<SUP>o</SUP>C on average and 551<SUP>o</SUP>C when considering peaking factor, while the MCST at the MOC (middle of core life) is 498<SUP>o</SUP>C on average and 548<SUP>o</SUP>C in the hot channel, respectively, and the MCST at the EOC (end of core life) is 499<SUP>o</SUP>C on average and 538<SUP>o</SUP>C in the hot channel, respectively. The maximum cladding surface temperature over the long cycle is found at the BOC due to its high peaking factor. It is found that all results including fuel rods, cladding, and coolant exit temperature are below the safety limit of general SFR design criteria.
Seo, H.,Kim, H.T.,Cha, J.E.,Bang, I.C. Pergamon Press ; Elsevier Science Ltd 2014 Annals of nuclear energy Vol.73 No.-
The moderator tank in a CANDU reactor plays a key role in the reactor core including the fuel channels and moderator. Understanding the circulation characteristics such as the flow pattern and temperature distribution in the moderator tank is important because the cooling capability is limited inside the fuel channels in the worst accident scenarios such as large break loss of coolant accident, resulting in heat removal through the Calandria tubes contacting with the fuels via thermal expansion. Therefore, measurement of the velocity profile and temperature distribution in the moderator tank is a key factor in the safety analysis of CANDU reactors because the moderator tank provides ultimate heat sink. In the present work, the velocity profile in a scaled CANDU6 moderator tank was obtained using particle image velocimetry from the 1st and 2nd jet orifices under symmetric and asymmetric flow conditions. The scaled moderator tank was prepared with acrylic, which is transparent to allow the laser penetration to create the light sheet for illuminating tracer particles. The velocity profile in the scaled moderator tank was obtained from the inlet nozzle running to the top of the tank along and near the curved wall surface and compared to a commercial CFD code, CFX.