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Optimization of a chimney design for cooling efficiency of a radial heat sink in a LED downlight

机译：优化烟囱设计以提高LED筒灯中的径向散热器的冷却效率

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摘要

A cooling system, consisting of a chimney and a radial heat sink, was developed for a light-emitting diode (LED) downlight to replace a conventional light for saving energy. Natural convection was simulated with a numerical model that was verified experimentally. When the chimney was installed around the radial heat sink, the cooling efficiency of the heat sink was improved because the cooling air was able to move to the center of the heat sink. Furthermore, the mass of the surrounding structure could be reduced due to the superior geometric characteristics of the chimney versus a hollow cylinder. The effects of the fin-type of the radial heat sink and the thermal conductivity of the chimney were analyzed. A parametric study of the geometric factors of the chimney was conducted and a multidisciplinary design optimization, which considered the chimney mass and cooling efficiency of the heat sink, was carried out. Consequently, installing the chimney can improve the heat sink's cooling efficiency by up to 20% (while maintaining the mass of the surrounding structure) or reduce the mass of the surrounding structure by up to 60% (for a given cooling efficiency), as compared to the installation of the hollow cylinder. (C) 2016 Elsevier Ltd. All rights reserved.
机译：开发了一种由烟囱和径向散热器组成的冷却系统，用于发光二极管（LED）筒灯，以取代传统的灯，以节省能源。自然对流通过数值模型进行了仿真，并通过实验进行了验证。当将烟囱安装在径向散热器周围时，由于冷却空气能够移动到散热器的中心，因此散热器的冷却效率得到了提高。此外，由于烟囱相对于空心圆柱体的优越的几何特性，可以减少周围结构的质量。分析了鳍片式径向散热器和烟囱的热导率的影响。对烟囱的几何因素进行了参数研究，并进行了多学科设计优化，考虑了烟囱的质量和散热器的冷却效率。因此，相比于给定的冷却效率，安装烟囱可以将散热器的冷却效率提高20％（同时保持周围结构的质量），或者将周围结构的质量降低60％（对于给定的冷却效率）安装空心圆柱体。 （C）2016 Elsevier Ltd.保留所有权利。

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