1 kW兩相蒸發冷卻系統設計及性能驗證

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姓名

林煜祥(Yu-Shiang Lin) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

1 kW兩相蒸發冷卻系統設計及性能驗證

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摘要(中)

因應下個世代處理器的散熱需求，本研究建立1 kW級泵推動兩相蒸發冷卻系統，為取代目前水冷系統在高發熱量時需較大流量及泵動力的缺點。建立系統設計不同流道高度2 mm、3 mm之直線微流道蒸發器，流道高度3 mm具有較佳的熱傳性能及較小的壓降，因其熱傳面積以及流道截面積的增加所致。而兩者工作流體流量於350 ml/min、1050 W發熱量時達到最高熱傳係數，可處理1 kW級的散熱。
　　泵浦方面比較市售不同的離心泵及隔膜泵不致孔蝕現象產生的入口最低過冷度，離心泵所需最低過冷度較小，可以降低整體系統冷凝器及蒸發器的熱阻。在應用方面，考慮蒸發器及冷凝器之間的熱阻平衡，分別比較不同流體工作溫度40℃、45℃及50℃在1 kW的加熱量下熱阻的分佈，而50℃時蒸發器及冷凝器熱阻分別為0.023℃/W及0.024℃/W，達到熱阻平衡。

摘要(英)

Due to the heat dissipate need for next generation processor, this research builds a 1 kW pumped two-phase evaporate cooling system, in replace the shortcoming of huge water flow rate and pumping power in liquid cooling system with high heat flux cooling. For the evaporator, we design rectangular channel with different channel height 2 mm and 3 mm, the result shows 3 mm has better heat transfer performance and lower pressure drop owing to higher heat transfer area and channel cross section. Both kind of evaporator get max heat transfer coefficient in flow rate at 350 ml/min and 1050 W heat dissipate, shows the ability to deal with 1 kW heat.
For the pump, cavitation effect needs to be avoid, so we compare the minimum inlet subcooled of commercial centrifugal and diaphragm pump, result shows centrifugal pump needs lower subcooled temperature, means decrease the thermal resistance of condenser and evaporator.
In application, the thermal resistance balance of evaporator and condenser should be considering, test different fluid working temperature in 40℃、45℃ and 50℃ in dissipating of 1 kW heat, evaporator and condenser thermal resistance meets together in 0.023℃/W and 0.024℃/W with working temperature in 50℃.

關鍵字(中)

★ 兩相蒸發冷卻系統
★ 流道高度
★ 孔蝕現象
★ 熱阻分佈

關鍵字(英)

★ two-phase evaporation cooling system
★ channel height
★ cavitation
★ thermal resistance

論文目次

摘要 i
Abstract ii
目錄 iii
圖目錄 vi
表目錄 x
符號說明 xi
第一章、前言 1
1.1 研究背景與動機 1
1.2 研究目的 9
第二章、文獻回顧 10
2.1泵推動兩相蒸發冷卻系統 10
2.2 微流道蒸發器流道高度 20
2.3 泵浦 22
2.3.1 孔蝕現象 22
2.3.2 各類泵浦比較 23
2.3.2.1 離心泵浦 23
2.3.2.2 隔膜泵浦 25
2.3.2.3 齒輪泵浦 26
2.3.2.4 螺桿泵浦 27
2.3.2.5 渦卷泵浦 29
2.4 冷凝器 31
2.5 總結 31
第三章、研究方法 33
3.1 兩相蒸發器之流道設計 33
3.2 泵浦挑選 39
3.2.1離心泵挑選 40
3.2.2 隔膜泵浦挑選 42
3.3 冷凝器挑選 43
3.4 實驗系統 45
3.4.1加熱系統 46
3.4.2 實驗量測儀器與設備 49
3.4.2.1 溫度量測 49
3.4.2.2 差壓量測 50
3.4.2.3 流量量測 50
3.4.3資料擷取系統 50
3.5 實驗步驟 54
3.6實驗數據換算 54
3.6.1 加熱瓦數 54
3.6.2 質量流率 55
3.6.3 乾度 55
3.6.4 熱傳係數 56
3.6.5 熱阻值 56
第四章、實驗結果與討論 57
4.1 蒸發器熱傳熱傳性能 57
4.1.1 流量對蒸發器熱傳性能影響 57
4.1.2 流道高度對熱傳性能差異比較 61
4.2 蒸發器壓降性能 64
4.2.1 流量對蒸發器壓降影響 65
4.2.2 流道高度對壓降差異比較 66
4.2.3 不同流道高度蒸發器運作性能 67
4.3 系統工作溫度點 68
4.4 過冷度對系統影響 72
4.4.1 泵浦過冷度實驗結果 73
4.4.2 過冷度與冷凝器大小關係 74
4.5 整體系統最佳工作點 75
第五章、結論 77
參考文獻 78
附錄(一)、實驗誤差分析 83
附錄（二）、冷凝器大小sizing 87

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指導教授

楊建裕(Chien-Yuh Yang)

審核日期

2022-9-29

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