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Computational thermal analysis of cylindrical fin design parameters and a new methodology for defining fin structure in LED automobile headlamp cooling applications

机译:圆柱翅片设计参数的计算热分析和定义LED汽车前照灯冷却应用中翅片结构的新方法

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In this study, the effects of fin design, fin material, and free and forced convection on junction temperature in automotive headlamp cooling applications of LED lights are researched by using ANSYS CFX 14 software. Furthermore a new methodology is presented for defining the optimum cylindrical fin structure within the given limits. For measuring the performance of methodology, analyses are carried out for various ambient temperatures (25 degrees C, 50 degrees C and 80 degrees C) and different LED power dissipations (0.5 W, 0.75 W, 1 W and 1.25 W). Then, analyses are repeated at different heat transfer coefficients and different fin materials in order to calculate LED junction temperature in order to see if the fin structure proposed by the methodology is appropriate for staying below the given safety temperature limit. As a result, the suggested method has always proposed proper fin structures with optimum characteristics for given LED designs. As another result, for safe junction temperature ranges, it is seen that for all LED power dissipations, adding aluminum or copper plate behind the printed circuit board at low ambient temperatures is sufficient. Also, as the ambient temperature increases, especially in high powered LED lights, addition of aluminum is not sufficient and fin usage becomes essential. High heat transfer coefficient and using copper fin affect the junction temperature positively. (C) 2015 Elsevier Ltd. All rights reserved.
机译:在这项研究中,使用ANSYS CFX 14软件研究了散热片设计,散热片材料以及自由对流和强制对流对LED前照灯冷却应用中结温的影响。此外,提出了一种用于在给定范围内定义最佳圆柱翅片结构的新方法。为了测量方法的性能,对各种环境温度(25摄氏度,50摄氏度和80摄氏度)和不同的LED功耗(0.5瓦,0.75瓦,1瓦和1.25瓦)进行了分析。然后,以不同的传热系数和不同的散热片材料重复分析,以计算LED结温,从而查看该方法提出的散热片结构是否适合保持在给定的安全温度极限以下。结果,对于给定的LED设计,所建议的方法始终提出了具有最佳特性的合适的鳍片结构。另一个结果是,对于安全的结温范围,可以看出,对于所有LED功耗,在低环境温度下在印刷电路板后面增加铝板或铜板就足够了。另外,随着环境温度的升高,特别是在大功率LED灯中,铝的添加不足,鳍片的使用变得至关重要。高传热系数和使用铜翅片会对结温产生积极影响。 (C)2015 Elsevier Ltd.保留所有权利。

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