蒸氣壓縮循環式電子散熱系統之性能研究

Investigation of Vapor Compression Cooling System for Electronic Elements

虞晉瑞(Jin-Ruei Yu)

指導教授 ： 陳希立

國立臺灣大學/工學院/機械工程學研究所/碩士(2007年)

https://doi.org/10.6342/NTU.2007.00557

摘要

隨著電子元件不斷地朝向高性能以及輕薄短小的方向發展，造成單位面積的發熱量愈來愈高，導致近年來各式散熱設備快速發展，而因應未來朝向高功率元件的發展趨勢，散熱模組也多以液態工作流體沸騰或冷凝的相變化方式來達到快速移除熱量之目的。在相關的散熱系統開發中，蒸氣壓縮循環式散熱系統是當中散熱能力最為優秀的方式，從相關文獻可以發現，該散熱系統之COP相當高，且散熱能力高達268W以上，而整個系統甚至可以使用微流道型式的蒸發器與冷凝器並小型化至符合NB內部的容納空間。
　　本研究為實驗室自行開發一套蒸氣壓縮循環式電子散熱系統，並規劃完整的實驗方法與流程，分析各部分元件在不同的參數下對系統性能的影響；包含了壓力調節閥開度、膨脹閥開度、加熱功率、風扇轉速、以及熱源溫度控制等相關參數。而實驗結果顯示出本研究所開發之散熱系統最大散熱（冷凍）能力為325Ｗ，COP最高可達2.4，較其它類型散熱模組表現都佳，未來若能增大冷凝器風扇轉速以及改良蒸發器內流道設計與壓縮機變頻運轉的話，更能提升本研究系統的性能表現。

關鍵字

蒸氣壓縮循環 ； 電子散熱 ； 溫度控制 ； 冷凍能力

並列摘要

The cooling of high power components in electronic products is uniquely challenging due to the increasing power in a narrow area. As a result, more powerful and efficient thermal solutions may be required in order to achieve higher power dissipation.
　　This dissertation experimentally investigates the thermal performances of the vapor compression cooling system（VCCS）for electronic elements. The VCCS includes a compressor, condenser, expansion valve , and two evaporators. All of these components are designed for a vapor compression cycle with R-134a as the working fluid. Especially the two evaporators were simulated to dissipate the heat generated from CPU and GPU respectively. A complete system was built and tested in order to determine overall system feasibility and performance.
　　Experimental results obtained with the prototype system demonstrate its feasibility and performance for use in cooling compact electronic devices. The cooling capacity of the VCCS investigated varied from 275W to 375W, with a COP of 1.9 to 2.4, at pressure ratios of 1.9 to 2.8. The thermal resistance of the evaporator was ranged from 0.12 to 0.21 oC/W. Finally, in order to avoid the destruction of the electronic devices, this research adopts dynamic fan speed to control the temperature of the heat source, which is varid from 1500 to 1725rpm.

並列關鍵字

Vapor compression cycle ； Electronic cooling ； Temperature control ； Cooling capacity

參考文獻

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