Design Of High Power Led Cooling System Base On Double Inlet And Outlet Water Jet

As a new light source, high-power LED has a small size, high luminous efficiency, long life, etc. Besides, LED doesn’t have toxic metal, which has a good prospect for development in the lighting field.LED consumes nearly 70% of the total energy used to generate heat. The light emitting junction made of semiconductor material has poor heat resistance. To make matters worse, several chips are placed on a small area in order to meet the lighting requirement, which makes the thermal environment worse. If the heat doesn’t dissipate promptly, LED chips will be burned in a short time. Studying on LED heat dissipation has important theoretical and practical value.This paper focuses on LED thermal problems and has studied these problems. Shapes of heat sink such as straight fin, straight radial fin, rectangular needle fin and cylindrical needle fin have been discussed under the condition of adding shroud.Heat transfer effects and optimum fin shape have obtained. Orthogonal experiment has been designed and extreme difference analysis is chose to study the influence of the heat sink and shroud parameter combinations. Through the analysis, a kind of programs for heat sink’s dissipation has obtained. Base on field synergy principle, a new heat exchanger based on double inlets and outlets water jet is designed. The heat transfer effects which are affected by the jet’s diameter and the flow of heat transfer fluid volume have been discussed. By comparing simulation, the desired results in the thermal performance of the radiator and the wall temperature uniformity are obtained. A LED intelligent temperature control system is built, the system’s software and hardware are designed. The finished system can collect and display the real-time chip substrate temperature, and can automatically adjust the fan and pump power depending on the temperature in order to guarantee constant chip temperature. The thermal performance is tested and the master variable of the system is obtained through experiments. A fuzzy controller is designed and the temperature control performance of the system has further improved.