Orthogonal Optimization Design And Experimental Research Of The LED Lamps Cooling Structure

With the rapid development of LED, the LED lamps guadually replaced the conventional light source of lamps. But, as the research show: the vast majority of injected electric power were transformed into heat energy. If the heat could not be dissipated in time, it could lead to many problems, such as life reduction, performance and Lumens deprections. This master article was concentrate on the optimal design and experimental research of three kinds of LED lamps cooling structure.For the problem of lack of theoretical guidance of current LED plastic-coated aluminum ball bubble lamp radiator optimization, applying orthogonal optimization in its radiator design was put forward. First of all, through the comparison of the heat cooling performance of three types of LED ball bubble lamps(all-aluminum, plastic-coated aluminum, and all-plastic), it was concluded that led plastic-coated aluminum ball bubble lamp has certain advantages. Then, on the basis of the verified model, the influence of different factors in heat dissipation and quality were analyzed through orthogonal optimization design. The influence of various factors on the temperature was obtained by range analysis and the best parameter combination was obtained by synthetically considering temperature and quality. Finally, the correctness of the model was built in SolidWorks software and thermally simulated by using finite element computational fluid dynamics(FloEFD). Results show that: after optimization through orthogonal experiments, although radiator quality increased mildly, the LED temperature decreased from 96.05 °C to 88.85 °C, which indicated a decrease of 7.2 °C and the cooling effect was greatly improved.The problem of high heat flux density and more concentrated heat dissipation of high power COB light source were carried on the theoretical analysis and experimental verification. By comparing with thermal simulation results which installed without and with fin radiator, it was concluded that the heat cooling performance of latter was significantly higher than the former. Then, the orthogonal experiment was carried out on the heat dissipation fin optimization design and the best parameter combination was obtained. The simulation results show that: after optimization of orthogonal experiment, the temperature was 74.73°C, which greatly improved the overall structure of the cooling performance. At the same time, the infrared thermal imager was used to verify. The results show that: the simulation results were in agreement with the experimental. In addition, the effects of solid crystal plastic thermal conductivity and heat conduction glue thermal conductivity was also studied, which could provide direction for further improvement of the heat dissipation performance.Aiming at the heat dissipation problems of LED used in the automobile headlight, a new type of LED automobile headlamp cooling structure was put forward. The no-leaf fan was used in radiator design creatively. The corresponding model was generated by SolidWorks. FloEFD was used to simulate the thermal condition and two improvement schemes were presented. With better cooling effect, Scheme II was optimized by the orthogonal experiment(The effects of honeycomb type, equivalent diameter, cell wall thickness, cell wall length, and ventilation tube length on the thermal performance of the cooling system were analyzed). Finally, the optimum parameters were obtained. Simulation result show that: the temperature of the LED car headlight model was 75.17 °C, which was 11.03 °C lower than the initial temperature. The thermal performance of the headlights was greatly enhanced. Finally, according to the structure, the relationship between the wind speed and temperature with were discussed and the corresponding expressions were obtained, which could provide a reference for further research of no-leaf fan selection.