| Summary: | 碩士 === 淡江大學 === 機械與機電工程學系碩士班 === 100 === Experimental investigations are performed on multi-well vapor chamber heat spreaders to study their temperature uniformity and heating rate. Vapor chamber heat spreader (112×75×17.2mm) with 96 wells (diameter of the wells is 5mm and depth is 10mm) is made of copper. A vapor chamber heat spreader without wells and an aluminum heat spreader with multi-well are also made for comparison. Six thermoelectric coolers (TEC) each with a power of 56W and an area of 30×30mm are applied evenly to the spreaders. Seven thermocouples measure temperatures on the heat spreaders from 25℃ to 90℃ at a heating power of 336W, and from 90℃ to 25℃ under forced convection cooling condition. With and without TEC cooling are also compared in the experiment.
Temperature uniformity is evaluated by the temperature difference and the standard deviation. Vapor chamber heat spreader has the better temperature uniformity than aluminum heat spreader due to a higher thermal conductivity. Aluminum heat spreader show the higher heating rate, followed by Vapor chamber heat spreader with wells, vapor chamber heat spreader without wells due to a larger heat capacity, heat up the slowest.
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