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분야
pptxObjective
Conception
2.Experimental tools
3.Assumptions
4.Process
5.Conclusion
Analysis of results
Proposal of improved heat sink
T –Type
(+)극 : 동
(-)극 : 니켈, 콘스탄틴
Advantage
가격이 저렴
입수가 용이
온도 측정 범위가 넓음
Steady state
Constant properties
The local atmospheric pressure is 1 atm
Air is an ideal gas
Consider as natural convection
Uncovered LED case
Gray & diffused body
Experiment-1
Thermocouple 8개 장착
앞면 3개
뒷면 4개
대기 1개
PCB를 수직으로 세워 실험
정상상태에 도달 시 온도 및 방사율 측정
Experimental data
정상상태
열전대 Case 1 Case 2
온도(℃) 평균온도(℃) 온도(℃) 평균온도(℃)
PCB 1 45.07 43.05 40.71 41.53
2 42.17 41.54
3 41.92 42.35
Heat sink 4 39.29 39.19 37.66 37.41
5 39.22 37.07
6 39.27 37.50
7 39.00 37.40
대 기 8 20.20 20.20 18.45 18.45
방사율 0.69 0.72
