Experiment Study On High Power LED Efficient Cooling Device

Energy conservation has become the main purpose of modern ship industry. Nowadays, LED has been used on ship’s illumination, because it can save more energy compared with other lighting methods. The power of LED used on ship are increasingly higher than before which contributes to more heat generated and this heat has to transfer out for keeping LED from damage. If the temperature of LED increases 10℃ after the normal operation condition, its working life will decrease for half, thus the reliability will decrease dramatically. Therefore, in order to control the temperature of LED has become a hot research spot for the related fields.To solve this problem, this thesis designs and represents a new heat sink for LED which combines Gravity Heat Pipes (GHP) and Oscillating Heat Pipes (OHP). Firstly, to evaluate the heat sink, the cooling column has been tested. The cooling column combines with GHP and OHP, so tests include the cooling performance of single GHP and single OHP, and the combinatorial test for the heat sink content both heat pipes. The following conclusions have been found:(1) From the combinatorial test, two types of heat pipes operating together, and the heat resistant of cooling column decreases, when the input power increases; (2) Gravity can promote the cooling performance for the vertical placement can acquire smaller heat resistant. (3) To compare with three tests, the heat resistant of the combinatorial cooling column is smaller than the single GHP or OHP cooling column. Based on the performance test of cooling column, the comparison test of the new heat sink represent in this thesis and the ordinary heat sink for LED. The following conclusions can be drawn:the temperature of evaporating section of the new heat sink is lower than the ordinary one. When the input power increases, the temperature difference will increase and the resistant of new heat sink will decrease. When the input power is 150W, the temperature of evaporating section is 90.0℃ and 102.1℃ for the new and ordinary heat sink, respectively, and the temperature difference is 11.2℃.