Abstract
Thermal management is crucial to guarantee the normal operation of light-emitting diodes (LEDs) Phase change heat sink is superior to traditional metal solid heat sink due to very small thermal resistance. In this study, a new type of phase change heat sink for high power LEDs is first designed. Then, the fabrication process of boiling structures at the evaporation surface of the phase change heat sink is discussed and analyzed. To make a comparison and deep discussion, the machining process is simulated through the FEM (finite element analysis) software, DEFORM-3D. Last but not least, heat transfer performance of the fabricated phase change heat sink is tested. Results have shown that the designed new type of phase change heat sink has superior heat transfer performance and is suitable for heat dissipation of high-power LEDs.
Highlights
Different from traditional incandescent lamps, fluorescent lamps and halogen lamps, light-emitting diode (LED) lamps are made of semiconductor materials
The photoelectric conversion efficiency is between 30% and 40%, and almost all the rest of the electrical energy is converted into heat, resulting in the increase of the temperature of the LED
Effective heat management of the LED light source is really necessary to guarantee the normal operation of the LEDs [3,4]
Summary
Different from traditional incandescent lamps, fluorescent lamps and halogen lamps, light-emitting diode (LED) lamps are made of semiconductor materials. Heat pipe is a kind of heat transfer unit with very high thermal conductive performance. It works by the effect of evaporation and condensation of the liquid in the vacuum tube (phase change heat transfer). When the hot side of the heat pipe is heated, the working liquid evaporates rapidly, and the steam flows to the cold side under the effect of pressure difference. For the sintering-type heat pipe, the capillary structure is made of copper powder through high temperature sintering.
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