Analysis Of Thermal Performance of a Graphite Heat Spreader with Design Modifications
Keywords:
Heat Spreader, Graphite, Maximum Heat Dissipation, Thermal PerformanceAbstract
A heat spreader is a common cooling method. It is a metal plate or foil that is thermally conductive and is used to transfer and disperse heat. A 20 x 16 mm graphite heat spreader has been designed with 1 mm thick copper strip in between its width. The 5 x 5 mm square copper power of 1mm thickness has been placed on the top face from which heat has to be dissipated. The power device was assigned copper as a material as well as the heat spreader was assigned graphite with a thermal conductivity of 900 W/mK. The cuboidal design of the heat spreader was modified to a circular disc. The thickness of graphite heat spreader was reduced to 4 mm, i.e. 2 mm each and the following cases with different diameters (20, 25, 30, 40mm) of the circular disc have been considered for the thermal analysis. After analyzing the results for all the above cases, the diameter with the best thermal performance has been selected further modifications have been done. The copper power device which was mounted above the surface of the graphite heat spreader has been now embedded inside the thickness of the graphite material and then the results have been analysed further. A graphite heat spreader with circular design and the power device embedded inside the disc has been found to perform better for maximum heat dissipation with a significant drop in the core temperature, i.e. 45.1oC, with the same boundary conditions but greater heat dissipation rate.
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