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工業技術研究院

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技術名稱: 雙滲透度毛細結構之熱管技術

技術簡介

而本研究提出雙滲透度之毛細結構設計,亦即毛細結構採用兩種不同毛細半徑之組合結構設計,以降低液相工作流體在毛細結構中之流動阻力,來提昇熱管之毛細限制。首先是燒結銅粉,以150μm銅粉之均勻毛細結構熱管,作為性能比較之基準熱管,其最大熱傳量為30W。而雙滲透度熱管所採用平均粒徑分別為215與150μm之銅粉做為毛細結構,蒸發區域採用150μm,其餘區域則採用215μm。實驗測試結果,採用雙滲透度毛細結構之新型熱管,其不同端加熱的狀態下,其最大熱傳量為分別為45W與30W。理論分析與實驗測試,對於性能提升幅度之預估是一致的。同樣以雙滲透度理論為基礎,設計內部複合式編織網結構,包含芯線、內層及外層,以芯線尺寸控制毛細結構之空間比例,藉以設計出最佳化之薄型熱管產品,內層編織網採用0.1mm較粗之線徑提供較大工作液體流動空間,以降低內部工作流體流動阻力,外層密集的編織網線徑則使用0.05mm,可提供高毛細力以作為提高最大熱傳量之用。量測結果證實複合毛細結構可有效提升毛細力並且提升薄型熱管性能,最大熱傳量由15W增加至20W。研究結果顯示出,透過雙滲透度之結構設計,能有效提升熱管之最大熱傳量。

Abstract

In this study, two different sizes of copper powder are used be new wick structure design in single heat pipe. The average diameters of copper powder are 215 and 150 micro meter respectively. The performance of heat pipe with the uniform wick structure is used to be the benchmark, and the maximum heat transfer is 30W. Through the experiment test results, the maximum heat transfer rates of the new designed heat pipe are 45W and 30W for different heating direction. The experiment results are consisted with the theory to predict. Based on the theory of dual permeability, the inner composite structure of the thin heat pipe is designed to contain the core, inner and outer layers, and the space ratio of the capillary structure is controlled by the size of the core. The inner layers uses the 0.1 mm wire diameter to provide a larger working fluid flow space to reduce the flow resistance of the working fluid. The outer dense layer wire diameter is 0.05 mm, which provides high capillary forces for increased maximum heat transfer rate. The new type wick structures for thin heat pipe which thickness is lower than 1.0 mm. The experimental results show that the composite capillary structure can effectively enhance the capillary force and increasing the performance of the thin heat pipe, the maximum heat transfer rate increased from 15W to 20W. The results of the study show that the dual permeability wick structural design can effectively increase the maximum heat transfer rate of the heat pipe.

技術規格

直徑6mm熱管採用燒結銅粉作為毛細結構,以150μm銅粉之均勻毛細結構熱管,其最大熱傳量為30W。雙滲透度熱管所採用平均粒徑分別為215與150μm之銅粉做為毛細結構,蒸發區域採用150μm,其餘區域則採用215μm。經過實驗測試結果,正向加熱之最大熱傳量為45W。採用編織網作為毛細結構,內層編織網採用0.1mm較粗之線徑提供較大工作液體流動空間,外層密集的編織網線徑則使用0.05mm,以增加毛細力。厚度1mm之熱管,其最大熱傳量為20W。

Technical Specification

Diameter 150μm copper powder is sintered as capillary structure in 6mm diameter heat pipe. The maximum heat transfer is 30W. With different permeability concept, two different diameters size of copper powders, which are 150μm and 215μm, are selected. 150μm copper powder is sintered in heating section and 215μm copper powder is sintered in rest section. The test results are that maximum heat transfer is 45W. The copper mesh is used as the capillary structure. The inner wire diameter is 0.1mm to provide lower flow resistance. The outer wire diameter is 0.05mm to increase the capillary force. The maximum heat transfer is 20W for the 1mm thick heat pipe.

技術特色

目前一般熱管製作廠商對於熱管內部毛細結構理論分析能力較為不足,常常以試誤法來尋找設計參數,這樣對於時間與材料都是一種浪費。透過高滲透度與高毛細力的雙滲透度設計觀念以及理論分析,可以縮短熱管的研發時間,並有效提升熱管之性能。

應用範圍

發熱電子元件之散(導)熱元件/系統用,或是冷熱流體間之熱交換器使用等

接受技術者具備基礎建議(設備)

具備熱管生產製作之燒結爐、編網機、抽真空與注水系統等設備。

接受技術者具備基礎建議(專業)

具備熱傳、流力等熱流理論計算與分析等相關知識

技術分類 01 綠能環境

聯絡資訊

聯絡人:曾智勇 節能設備技術組

電話:03-5917495 或 Email:chihyungtseng@itri.org.tw

客服專線:+886-800-45-8899

傳真:none

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