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상온에서 $1100^{\circ}C$까지 온도변화에 따른 콘크리트의 열물성 측정치
신기열,정모,김상백,김종철,Shin, Ki-Yeol,Chung, Mo,Kim, Sang-Baik,Kim, Jong-Chul 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.5
Thermophysical properties and the compressive strength of concrete used in nuclear power plants in Korea were measured. The chemical composition of the concrete was also analyzed. The measured thermophysical properties include the density, the thermal conductivity, the thermal diffusivity and the specific heat for a wide temperature range of 20.deg. C to 1100.deg. C. The chemical composition of Korean concrete is similar to that of US basaltic concrete and the thermophysical properties are strongly temperature dependent. The density, the conductivity and the diffusivity decrease with an increase in temperature, and particularly the conductivity and the diffusivity are a 50-perdent decrease at 900.deg. C as compared with these values at room temperature. The specific heat increases until 500.deg. C, decreases from 700.deg. C to 900 .deg. C, and then increases again when temperature is above 900.deg. C. The measurement beyond 1100.deg. C is not acceptably accurate because the concrete decomposes to a liquid phase from a solid phase at that temperature. The results of this study can be applied, for example, to an analysis of the molten core-concrete interaction (MCCI) phenomenon of concrete structures at high temperature will also require those property data, especially for high temperature ranges.
플라즈마 용사에 있어 플라즈마 가스와 분말입자의 열전달 상호작용에 대한 수치해석
신기열(Ki-Yeol Shin),정모(Mo Chung) 한국전산유체공학회 1997 한국전산유체공학회 학술대회논문집 Vol.1997 No.-
Numerical analysis of the jet flow which was developed from DC non-transfered plasma torch was investigated for an analysis of thermal palsma spray characteristics. The numerical flow field resulted in a two-dimensional, steady state fluid model where the turbulence effects were considered in the standard K-ε model. The sprayed particle-plasma interaction with dual injection ports are considered.
차경엽(Kyung-Yup Cha),신기열(Ki-Yeol Shin) 한국에너지기후변화학회 2021 에너지기후변화학회지 Vol.16 No.1
Energy demand management is a way to achieve energy conservation by improving the energy use efficiency of consumers or by changing energy consumption behavior. In spite of the governments mid-to-long-term plan and various financial support and regulatory policies, Koreas energy consumption is steadily increasing and efficiency improvement is insufficient. In this study, energy efficiency was assessed by quantitative analysis methods in the industrial sector, which accounts for a large portion of energy consumption, in order to analyze the operation status of energy demand management in Korea. From the study, it was found that despite the governments efforts, the energy efficiency of the industrial sector has not improved. This was due to the increase in consumption by more energy intensity companies with an annual energy consumption of 2,000 TOE or more, and some high-energy intensity industries such as steel and petrochemicals. And the result of factor analysis shows that the improvement effect of energy intensity in more energy efficiency industries is insufficient. Besides, by company size, small and medium-sized enterprises are showing improvement in energy efficiency, but it was found that large-sized enterprises are not effective.
LED 히트싱크 설치조건과 형상변화에 따른 방열성능 실험
정연국(Yeon-Guk Jeong),신기열(Ki-Yeol Shin),김준환(Jun-Hwan Kim) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
In this paper, an experiment was conducted to investigate the heat dissipation performance by changing installation angles and the design shape of a heat sink in the automotive LED(Light Emitting Diode) lamps. The surface convective heat transfer coefficient can be derived through the heat dissipation performance test according to the installation angles as vertical and horizontal directions. The general thermal performance test of heat sink was performed at the natural convection experimental conditions. As a result, the heat sink installation angle of 90° by the horizontal direction showed the best heat dissipation performance, and when convective holes are added, the junction temperatures were measured lower than normal shape as 2.4~2.8℃ less because of the fin surface heat transfer improvement. However, as conductive heat resistance in the basement increases by the number of holes, the optimal design condition of the convective hole was existed for improving the total heat dissipation performance.
진태환(Tae-Hwan Jin),신기열(Ki-Yeol Shin),임용훈(Yong-Hoon Im),윤시원(Si-Won Yoon),장기창(Ki-Chang Chang) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
A high energy, efficient, harmonious, ecological greenhouse has been highlighted by advanced future agricultural technology recently. This greenhouse is essential for expanding the production cycle toward growth conditions through combined thermal environmental control. However, it has a negative effect on farming income via huge energy supply expenses. Because not only production income, but operating costs related to thermal load for thermal environment control is important in farming income, it needs studies such as a harmonious ecological greenhouse using natural ventilation control. This study is simulated for energy consumption and thermal environmental conditions in a three-layered greenhouse by natural ventilation using window opening. A virtual 3D model of a three-layered greenhouse was designed based on the real one in the Gangneung area. This 3D model was used to calculate a thermal environment state such as indoor temperature, relative humidity, and thermal load in the case of a window opening rate from 0 to 100 %. There was also a heat exchange operated for heating or cooling controlled by various setting temperatures. The results show that the cooling load can be reduced by natural ventilation control in the summer season, and the heat exchange capacity for heating can also be simulated for growth conditions in the winter season.
정밀부품의 생산공정관리를 위한 측정시스템의 개발과 제품의 신뢰성 평가
조경철(Kyung-Chul Cho),정평석(Pyung-Suk Jung),신기열(Ki-Yeol Shin),오상균(Sang-Kyun Oh) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
In this study, we developed a new measurement system which can be used for PCB manufacturing process. A thickness measurement data of module PCB is one of important specification from buyer. Because it could be made a big problem in a appliances such as Pc. So PCB maker need to check on all contact surface thickness and monitor their manufacturing process can be trusted. We had calibrated all sensors and measured reference two specimens. Measurement system can be provided high accuracy value, 4㎛ of repeatability, and we verified Guage R&R value as 3.97% which is shown a value of good enough to measure.