多孔腔体内圆形LED散热器的热管理

In this work, we analyze numerically, using Comsol Multiphysics, the influence of four parameters (the power of the lamp, the ambient temperature, the angle of inclination of the lamp and the number of holes in the lamp cavity) on the evolution of the junction temperature of a LED lamp placed in a multi-hole cavity using a fractional factorial plan. Taking into account the results obtained, we optimize our model using the Minitab manipulation software. Thus, a Pareto analysis (ANOVA) is carried out and a mathematical model is deduced to estimate the junction temperature of the LED lamp as function of the controlled parameters. The different influencing factors and especially the relative amplitude of their effect on the temperature of the LED chip could thus be calculated and demonstrated. If the electric power supply of the LED remains the first factor of impact on the temperature, the other parameters as well as the number of holes, the angle of inclination or the ambient temperature could thus be prioritized in order of influence. Then an improved model is provided, and its limit with regard to the cavity's condensation detection was examined showing that the risk of water condensation inside the cavity is only detected in the case where the lamp is exposed in an extremely humid area.