Thermal analysis of heat sink employed on tunnel lighting lamps

As a new type of solid-state light source, LED has many advantages. Its lifetime and lighting effect are related to its thermal performance. In this study the effect of heat sink cooling capacity from factors were researched, and the factors were such as material of heat sink, height of heat sink and the number of fins. It was observed that the cooling capacity of heat sink increases with increasing of thermal conductivity. Copper and silver are not fit for heat sink materials though they have excellent cooling capacity because of their high density and price, while aluminum and its alloy are the better choices. And it was revealed that the cooling capacity of heat sink increases with increasing of the height of fins, but this trend has slowed down when the average height reached 40mm.It was also observed that the cooling capacity of heat sink increases with increasing of the number of fins when fins are less, while the heat sink was higher, the cooling capacity maybe decrease with the increasing of the number of fins.