| Summary: | 碩士 === 元智大學 === 機械工程學系 === 95 === In the present study that using the radiator (heat sink) by the natural convection took the
radiation way for research the different places of heat sink and arrange different LED
quantity onto same radiating surface to monitor its performance of thermal conduction.
According to the experimental result, when radiator arrangement by stand condition,
LED aluminum plate temperature is difference with the T3 that is rising along with the total
power increasing, and the thermal resistance also makes the slow rising along an then decline
with the LED electric power increasing. As for temperature change demonstration of T1, T4
and T7, when the temperature difference of radiating plate is big, it is also increasing the
thrust of the natural convection. For the thermal resistance portion, the environmental
thermal resistance of T7 is lower than T4, T1, so when LED luminous efficiency under 1W,
the temperature difference and the power will be synchronous change, once it is above 1W,
the thermal resistance drops gradually, its maximum turning point of temperature difference
is approximately 30℃.
Regarding to LED quantity control, the rising rate is quickest of 30 LED radiating plate,
and the temperature is extremely approach for radiating plate of 45 and 60 LED when the
power approaches 1W; besides the rising rate is slowest of 60 LED radiating plate. Depend
on brightness requirement, the illuminant which provide by 60 LED to obtain a lower
temperature so that system can reduce the thermal protective measures.
Through this present study may understand influence in different illuminant density to
radiating structure and the temperature difference in LED radiating device for the radiation
design of backlight module and LED illuminant module evaluation.
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