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부유식 태양광 발전기의 패널과 부유체에 작용하는 풍하중과 유동특성
유대겸(Dae Gyeom, Yu),송의혁(Eui Hyeok, Song),이계복(Kye Bock, Lee) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.5
A floating photovoltaic generation system is composed of photovoltaic panel, supporting system and floating system. Since this system is installed outdoors, the effect of wind load on the structure is very large. In this study, the wind loads most affected on the floating photovoltaic generation structure were obtained by computational fluid dynamic analysis. The flow characteristics and wind loads were analyzed for various wind orientations. The analysis showed the position of the maximum wind load to the wind direction and the flow characteristic around the solar panel and floating system.
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혼화 및 유동특성에 미치는 라인믹서 내 혼합요소의 영향
유대겸(Dae-Gyeom Yu),이계복(Kye-Bock Lee) 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.10
본 연구에서는 라인믹서 내의 압력손실과 혼화성능에 대한 혼합요소의 영향을 해석하였다. 기체와 액체가 혼합된 고농도 오존수 장치는 단체급식시설의 살균 및 소독, 양식장의 수질관리 등 다양한 분야에서 사용되고 있다. 그러나 기존에 사용되는 장치는 가압방식을 사용하여 부피가 매우 크다. 최근에는 기후 변화로 강수량이 감소하여 지하수 및 지표수의 오염으로 음용수의 살균은 매우 중요하다. 따라서 기존의 장치와 대비하여 작은 공간을 사용하면서도 정수기능을 갖는 라인믹서형 기체-액체 혼합장치의 개발이 필요하다. 본 연구에서는 라인믹서 장치 내에 삽입한 혼합요소인 static mixer의 개수, 오리피스의 형태와 개수, 오리피스에 부착된 베인의 모양에 따른 유입유체의 혼화상태와 유동특성을 전산유체역학 모사를 통해 해석하고 혼화상태에 미치는 영향을 평가하였다. 곡면의 베인을 부착한 오리피스를 라인믹서에 사용한 경우 static mixer를 사용한 경우와 비교하여 비슷한 혼화정도를 나타내면서 압력손실양은 50% 이상 감소하는 것을 확인하였다. This study investigates the effect of the mixing elements on the pressure loss and mixing performance in line mixer. The high density ozone water devices mixed with gas and liquid are used in various fields such as sterilizing of group feeding facilities and water quality management at a fish farm. Due to the decrease in rainfall due to climate change, pasteurization of drinking water from ground water and surface water is extremely important. Therefore, it is intended to develop a line-mixed gas liquid mixer with a small amount of space. In this study, the effects of the number of static mixers and the types and the number of the orifice used in line mixer on the volume fraction and the pressure loss were studied by CFD simulation. The pressure drops of line mixer with orifice which curved vanes were attached to were down to more than 50 percent of that of line mixer with static mixer whereas the mixing performance of the former was similar to that of the latter.
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송의혁 ( Eui-hyeok Song ),( Riguang Chi ),유대겸 ( Dae-gyeom Yu ),이석호 ( Seok-ho Rhi ),이동주 ( Dong-ju Lee ),이계복 ( Kye-bock Lee ) 충북대학교 산업과학기술연구소 2019 산업과학기술연구 논문집 Vol.33 No.1
Power electronics devices are now widely used to efficiently deliver electrical power in hybrid/electric cars, home electronics, telecommunication, and so on. Large heat accompanied with these power electronics should be transmitted to the heat sink. In the present study, cooling technologies based on heat sink with different material and thermal properties. High cooling performance can manage junction temperatures to achieve goals for system efficiency, product cost, and system reliability. Cooling technologies depend on heat spreading and moving by heat conduction associated with convection. Usually, natural or forced air cooling heat sink provides efficient heat spreading. Thermal stress of electronics PCB is affected by thermal expansion in interconnection with different material. In the present study, pin fin heat sinks of different materials were investigated in terms of 3 dimensional thermal conductivity allocation. In this analysis, the cooling performance was observed in three terms of chip junction temperature variation. heat sinks made of usual metallic materials such as Copper and Aluminum were compared with heat sinks of orthographic thermal conductivity composite materials. The pin-fin heat sink of k<sub>x</sub>-k<sub>y</sub>-k<sub>z</sub> = 810-52-810 W/m-K composite material shows slightly higher thermal performance. The optimum heat sink design should be accompanied with special care on thermal conductivity allocation in three dimensional directions.
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