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냉각수 온도와 대기온도 영향에 따른 OBC내 전자부품의 온도에 관한 실험적 연구
송백기(Baikkee Song),오성민(Sungmin Oh),강재준(Jaejun Kang),김승중(SeungJoong Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
This paper discusses a temperature change of electronic components in OBC(On-board Battery Charger) according to the cooling water and the ambient temperature. Each electronic component has a temperature limit for satisfying a operating condition and a lifetime of the OBC. Thus, a power control should be optimized to prevent electronic components from overheating. As a result, to predict how much the power produced at a certain temperature condition, the cooling water temperature and the ambient temperature which are dominant factor of electronic component temperature should be defined exactly. In this reason, temperature map--power versus temperature (cooling water and ambient temperature)--is required. However, drawing a temperature map through experiment at every temperature condition is costly and time-consuming. In this paper, therefore, as analyze the temperature change of electronic component based on cooling water temperature and ambient temperature through experiment, temperature of temperature sensor which is one of the electronic components of OBC is calculated and then power at certain temperature condition can be predicted accurately. At the conclusion, actual power and calculated power are shown to validate temperature variation according to temperature conditions.
Twisted Wire를 사용한 미소 히트파이프의 성능
부준홍,김동근 한국 항공대학교 항공산업기술연구소 1999 航空宇宙産業技術硏究所 硏究誌 Vol.9 No.-
전자부품 냉각용 미소 히트파이프의 열적 성능을 조사하기 위해 내부 삽입물로 꼬은 와이어를 갖는 구리 히트파이프에 대한 실험을 수행하였다. 미소 히트파이프의 작동 유체로는 물과 아세톤을 이용하였으며, 이 파이프들의 직경은 3mm이고 전체 파이프 길이는 300mm이다. 작동유체 충전량, 열부하, 와이어 피치, 삽입된 와이어의 개수, 경사각 등을 성능에 대한 중요한 요인으로 고려하였다. 온도 특성을 분석하였으며, 실험 자료들로부터 최적의 충전량을 확인하였다. 본 논문에서 미소 히트파이프가 감당하는 최대 열부하는 물과 아세톤을 작동유체로 하는 경우에 대해 각각 10W와 8W로 나타났다. A series of experiments was conducted with a copper heat pipe having twisted-wire inserts to investigate the thermal performance of miniature heat pipes for electronics cooling. Acetone and water were used as working fluids for the miniature heat pipes, of which the diameter was 3 mm and the total length was 300 mm. Fluid charge, thermal load, pitch of wire twist, number of inserted wires and inclined angle were considered as important performance factors. Temperature characteristics was analysed and the optimal limquid charge values were found from the experimental data. The maximum thermal load of the miniature heat pipe were 10 W and 8 W for acetone and water, respectively.
하이브리드 자동차 구동시스템용 냉각 유로 최적화에 관한 연구
이광희(K.H. Lee),김재원(Jae Won Kim),안은영(E.Y. Ahn) 한국전산유체공학회 2009 한국전산유체공학회지 Vol.14 No.1
The cooling system for electric devices of hybrid vehicles is examined. The present system is composed of coolant paths, inlet diffuser and heat sinks whose shapes are diamond and circular. In this work, inlet duct and fin arrays are combined in proposed models and examined by numerical calculations. Nusselt number and Reynolds number are considered for heat transfer performance. Main focus lies on the looking for optimal model for the cooling system adopted to compact driving module of a hybrid vehicle. The optimal model shows uniform flow patterns in the inlet diffuser and secondary flows after the fins attached to heat source. It is found that the vortical flows around the heat sinks are effective for heat removal mechanism.