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자연대류와 복사열전달을 고려한 원형 히트싱크 최적 설계
장대석(Daeseok Jang),유승환(Seung-Hwan Yu),이관수(Kwan-Soo Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
A radial heat sink, adopted to LED (light emitting diode) down light, was optimized. Discrete transfer radiation model (DTRM) was used to calculate radiation heat transfer, and numerical model was verified with experimental results. The effects of number of fin, long fin length and middle fin length on overall thermal resistance and radiation heat transfer were analyzed. As the emissivity increased, thermal resistance decreased due to the increment of radiation heat transfer and the thermal resistance had a same tendency. The radial heat sink was optimized and optimum number of long fins is 19~28, optimum length of long fin is about half of radius of heat fink and optimum fin ratio is 0.4~0.7.
PCB channel을 이용한 LED light bulb용 히트싱크 설계
장대석(Daeseok Jang),김광일(Guangri Jin),김정한(Jung-Han Kim),이관수(Kwan-Soo Lee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Light-emitting diodes (LED) are rapidly replacing conventional light bulbs in light applications because of their increased life span and energy efficiency. LED light bulb is used in various places, and the installation angle can vary based on the application and the environment, which significantly affects the cooling of the LED. If the heat dissipation performance of the LED light bulb is insuffi-cient, both the life of the LED and its luminous efficiency decrease. In this study, we analyzed the flow characteristics and thermal performance of cooling apparatus which has the vent in bulb case and is using the PCB as a heat sink. Furthermore, the thermal performance change of PCB heat sink according to the installation angle was analyzed.
복사 열전달을 고려한 자연대류 원형 히트싱크 열전달 해석
유승환(Seung-Hwan Yu),장대석(Daeseok Jang),이관수(Kwan-Soo Lee) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.4
본 연구는 LED 조명기구에 적합한 원형 히트싱크의 최적설계를 수행하였다. DTRM 복사 모델을 이용하여 자연대류와 복사 열전달을 수치적으로 해석하였고, 수치모델을 실험을 통하여 검증하였다. 휜 개수, 긴 휜 길이, 중간 휜 길이가 전체 열저항 및 복사 열전달에 미치는 영향을 조사하였고, 그 결과 방사율이 증가할수록 복사 열전달의 크기는 증가하여 열저항은 감소하지만, 인자 변화에 따른 전체 열저항의 경향성은 거의 일정하였다. 원형 히크싱크의 최적화를 수행하였고, 최적화된 긴 휜의 개수는 19~28 개, 긴 휜의 길이는 히트 싱크의 반지름의 1/2 이고, 휜의 길이 비는 0.4~0.7 사이의 값을 얻었다. A radial heat sink, adopted to LED(light emitting diode) downlight, was optimized. Discrete transfer radiation model (DTRM) was used to calculate radiation heat transfer, and numerical model was verified with experimental results. The effects of number of fin, long fin length and middle fin length on overall thermal resistance and radiation heat transfer were analyzed. As the emissivity increased, thermal resistance decreased due to the increment of radiation heat transfer. The radial heat sink was optimized and optimum number of long fins is 19~28, optimum length of long fin is about half of radius of heat fink and optimum fin ratio is 0.4~0.7.