純冷媒R-134a 及冷媒與潤滑油混合流體於小管內之性能比較

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林建順(Jian-Shui Lin ) 查詢紙本館藏

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機械工程研究所

論文名稱

純冷媒R-134a 及冷媒與潤滑油混合流體於小管內之性能比較

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摘要(中)

本文主要以實驗方法分析冷媒R-134a 與潤滑油混合後，在管徑1.7 至6.4mm 圓管內之絕熱壓降、凝結及蒸發熱傳性能比較，實驗量測含油濃度由0 ~5%，質量速度為100 ~ 1000 kg/m 2 s ，熱通量為6 ~ 10 kw/m 2 。
冷媒及冷媒-潤滑油混合流體的壓降梯度，兩者相差不大，對整體壓降梯度的性能並無太大影響。
凝結熱傳，含潤滑油後的熱傳係數並沒有受到顯著影響，與純冷媒時的熱傳係數比較相差不大，較高含油量熱傳係數會略微降低。而蒸發熱傳的熱傳係數會比純冷媒高，其主要受到冷媒-潤滑油混合流體的潤滑油薄膜附著於管壁，使測試管管壁不會因冷媒蒸發而產生乾涸現象，降低熱傳係數，當冷媒加入適量的潤滑油，對於蒸發熱傳具有熱傳增強的效果。

關鍵字(中)

★ 冷媒含油壓降
★ 冷媒含油熱傳
★ 壓降
★ 潤滑油
★ 熱傳

關鍵字(英)

★ heat transfer
★ two phase

論文目次

目錄
頁次
摘要-------------------------------------------------- i
目錄------------------------------------------------- ii
表目錄------------------------------------------------ v
圖目錄----------------------------------------------- vi
符號說明--------------------------------------------- xi
第一章前言---------------------------------------------1
1.1 研究背景------------------------------------------ 1
1.2 研究目的------------------------------------------ 2
第二章文獻回顧---------------------------------------- 4
2.1 管內壓降---------------------------------------------------- 4
2.2 管內熱傳---------------------------------------------------- 8
2.2.1 蒸發熱傳---------------------------------------------------- 8
2.2.2 凝結熱傳--------------------------------------- 16
2.2.2 管內流譜--------------------------------------- 20
第三章實驗方法--------------------------------------- 35
3.1 簡介----------------------------------------------35
3.2 實驗系統----------------------------------------- 36
3.2.1 測試段----------------------------------------- 36
3.2.2 冷媒循環系統----------------------------------- 36
3.2.3 水循環系統------------------------------------- 37
3.3 實驗量測設備------------------------------------- 37
3.3.1 溫度測量--------------------------------------- 37
3.3.2 壓力量測--------------------------------------- 38
3.3.3 壓差量測--------------------------------------------------- 38
3.3.4 流量量測--------------------------------------- 39
3.3.5 資料擷取系統----------------------------------- 39
3.4 實驗過程----------------------------------------- 39
3.4.1 系統測漏--------------------------------------- 40
3.4.2 系統冷媒填充----------------------------------- 40
3.4.3 系統冷凍油填充--------------------------------- 40
3.4.4 冷凍油濃度量測--------------------------------- 41
3.4.5 實驗步驟----------------------------------------41
3.5 資料換算----------------------------------------- 42
3.5.1 熱傳資料換算----------------------------------- 38
3.5.2 兩相壓降資料換算------------------------------- 46
3.6 Modified Wilson Plot Method-----------------------48
第四章實驗結果與討論--------------------------------- 77
4.1 兩相絕熱壓降------------------------------------- 77
4.2 凝結熱傳----------------------------------------- 78
4.3 蒸發熱傳----------------------------------------- 80
第五章結論------------------------------------------ 127
參考文獻-------------------------------------------- 129
附錄------------------------------------------------ 133

參考文獻

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指導教授

楊建裕(Chien-Yuh Yang)

審核日期

2001-7-17

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