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베이퍼챔퍼 제조기술을 적용한 LED 투광등기구의 열 특성 비교에 관한 연구
서진국(Jin-Kook Seo),유영문(Young-Moon Yu) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.1
The purpose of this paper is to analyze thermal characteristics of the heat sinks to maximize the thermal diffusivity for LED floodlight. The 2 kind of samples were prepared by vapor chamber manufacturing technology using the heat pipe principle. It was analyzed the maximum temperature reduction effect and the thermal diffusion from the heat source depending on the types of chambers with 3 kind of working fluids. As a result, it was confirmed that thermal conductivity 23% increased, GVC-R type than IVC-R type.
히트파이프를 이용한 항공전자장비용 냉각장치 열전달 성능 연구
박상진(Sang Jin Park),윤용훈(Yong Hun Yun),심규영(Kyu Young Sim),윤대원(Dae Won Yoon),서진국(Jin Kook Seo) 대한기계학회 2021 大韓機械學會論文集B Vol.45 No.3
항공전자장비의 고성능화가 요구됨에 따라 전자소자의 방열설계는 중요한 요소가 되어가고 있다. 특히 전자소자의 발열량을 제어하지 못할 경우 온도가 상승하여 운용 중 성능저하 및 영구적 손상이 발생할 수 있다. 본 연구에서는 항공전자장비의 방열을 위한 냉각장치를 제작하여 해석과 시험을 통해 비교하였다. 냉각장치 열전달부를 히트파이프, 알루미늄, 구리를 이용하였으며 시험 결과, 히트파이프의 최고온도가 142.3°C로 나타나 알루미늄 대비 18.0°C 낮았고, 구리 대비 12.7°C 낮았다. 온도 편차는 알루미늄 대비 27.2°C, 구리 대비 17.0°C 가량 낮게 나타나 히트파이프의 열전달 성능이 가장 우수한 것을 확인하였으며, 작동 유체의 안정성을 검증하였다. Because the high performance of avionics equipment is required, the heat dissipation design of electronic devices has become necessary. If the heating value of electronic devices is not adequately controlled, malfunction and degradation might occur during operation. In this study, we produced, analyzed, and tested cooling devices of avionics equipment for heat dissipation and compared them. In addition, we used the heat transfer block made of a heat pipe, aluminum, and copper. From the test results, the maximum temperature of the heat pipe was 142.3°C, which was 18.0°C and 12.7°C lower than those of aluminum and copper, respectively. The temperature deviation was lower than that of aluminum and copper at 27.2°C and 17.0°C, respectively. Hence, the heat pipe exhibited the best heat transfer performance. Furthermore, we verified the safety of the working fluid inside the heat pipe.
HIPPS용 Class 1500급 Trunnion 볼밸브의 신뢰성 평가
장임남(Im-Nam Jang),서진국(Jin-Kook Seo),이삼일(Sam-Il Lee),김능현(Neung Hyun Kim),이재훈(Jae-Hoon Lee) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.5
HIPPS (High Integrity Pressure Protection System) is a kind of safety to prevent failure and accident caused by abnormal pressure. Generally, it is located at the front of the important equipment such as separator linked on pipe line. HIPPS system is consist of three parts, sensors to detect the high pressure, a logic solver to process input-pressure from sensors and final elements to perform actural shutting off action for the source of overpressure. One of the main final elements is ball valve, it is used for the purpose to obstruct the flow of the inside fluid. Thus ball valve sealing is very important to shut off fluid completely. This study address the analysis of structural stability and the result of the shall test and closure of Class 1500, trunnion type ball valve by the regulation, ASME B 16.34.