| Summary: | 碩士 === 明志科技大學 === 機械工程系機械與機電工程碩士班 === 102 === The heat dissipation from the LED light source is critical due to the luminous efficacy is mainly affected by the junction temperature of LED. A well approach to dissipate the heat from the p-n junction is by way of the heat sink of metals. The metals such as aluminum and cooper are often used to be the heat sinks for LED light sources. However, the cost percentage of the heat sink among the whole LED light source is 25-40% which is the key part to increase the ratio of performance to price. For increasing the previous ratio the dissipation power respect to the unit weight of heat sink is essential. The size factors of the heat sink are varied to simulate the temperature distributions by Icepack under different LED powers of 4.15, 6.65 and 13 Watts. Comparison the simulation and experimental results reval that the double slants of this
developed heat sink may enhance the heat dissipation of the LED light source, and the output luminous flux is thus increased. This output luminous flux of the 2 feet in length T8 LED tube, 15280 lm based on the luminous efficacy of 80 lm/W of commertial LED one, is 40% higher than commertial ones. A total
weight of this aluminum extrusion heat sink of 128 gram to disspate 21 Watts dedicates this developed heat sink has a very high ration of performance to price for spreading of LED light sources.
|
|---|
