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고만석(Manseok Ko),이주한(Juhan Lee),서태범(Teabeom Seo) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
LED Junction Temperature is related to it's performance and durability. Proper cooling system is needed to keep the temperature below proper operation condition, to use on LED head lamp. The present cooling system for LED head lamp is composed of heat sink and fan without consideration of fluid flow. This study point out the problem of present system by using numerical analysis and propose a method for improving the performance of cooling system, using flow guide. Therefore, the improved model shows that the junction temperature maintained under the proper operating condition.
Fan과 Heat Sink를 이용한 LED Head Lamp의 냉각성능해석
고만석(Manseok Ko),양승복(Seungbok Yang),이주한(Juhan Lee),강병도(Byungdo Kang),서태범(Taebum Seo) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
LED has the merits of High reliability, Semi-permanent life, rapid-response and its small size for use as light source of head lamp. But the dependence of its performance and life on temperature affect on its practical use. Which dependence makes problem when the LED is heated up to a higher temperature level by self-generation of heat, due to “highly integration” to get enough quantity of light. To solve this problem, effective cooling system is needed that consider conduction, convection and radiation. This study point out the limits of natural convection cooling system and propose of forced convection with heat sink. Also, describes a correlation between heat sink area and fluid velocity using numerical analysis to optimize of cooling system.
수치모델을 이용한 자동차 헤드램프 내부의 습기발생 현상 해석 연구
고만석(Manseok Ko),정영국(Youngguk Jung),조현석(Hyunseok Cho),신예원(Yewon Shin),서태범(Taebeom Seo) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Increasing styling features for automotive headlamps speed up the focus of understanding condensation at inner surfaces. Water vapor condensation on the inside surface of the headlamp lens is an essential factor that affects secure front view and headlamp life. One of the headlamps of automobile which is one of the most popular in Korea was chosen for the present analysis. In the basis of the experimental data of automobile given by a manufacturer, boundary conditions were defined and free convection of the air inside the headlamp and radiation from the bulb to the other surfaces are considered. As a result, temperature distribution of the inside surface of the headlamp lens are approximately the same as the experimental result.
팬과 히트 싱크를 이용한 LED 전조등의 냉각성능 해석
고만석(Manseok Ko),이주한(Juhan Lee),오상준(Sangjune Oh),조현석(Hyenseok Cho),서태범(Teabeom Seo) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.12
LED has the merits of high reliability, semi-permanent life, rapid-response and its small size for use as light source of head lamp. But the dependence of its performance and life on temperature affect on its practical use. Which dependence makes problem when the LED is heated up to a higher temperature level by self-generation of heat, due to “highly integration” to get enough quantity of light. To solve this problem, effective cooling system is needed that consider conduction, convection and radiation. This study points out the limits of natural convection cooling system and propose of forced convection with heat sink. Also, it describes a correlation between heat sink area and fluid velocity using numerical analysis to optimize the cooling system.
램프 열 성능 예측의 신뢰도 향상을 위한 해석 프로세스 개선
최봉근(Bongkeun Choi),이철우(Chulwoo Lee),고만석(Manseok Ko),이수봉(Soobong Lee),김억(Ok Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
As lamp system is considered as one of the most important components that determine the image of car, most of manufacturers place great emphasis on lamp design for their success in the development of new car. In this research various techniques of advanced CFD analysis were suggested so as to simulate more physical phenomena and improve the accuracy of estimating lamp performance and support the effective success in esthetic design of lamp system after all.