臺灣博碩士論文加值系統

本研究主旨在探討碳氫化合物冷媒R-290與R-600a-潤滑油(150SUS)混合物流經微鰭管具四種內插物(繞花絲、螺旋線圈、扭帶型、螺旋彈簧)之蒸發熱傳與兩相壓降特性之實驗研究。實驗參數範圍之在含油濃度為0 ~ 5%、質量速度為 200 ~ 500 、飽和溫度為15°C、熱通量為10.24 。
實驗結果顯示，蒸發熱傳係數隨著質量速度增加而增加，隨著潤滑油濃度增加而減少。管內兩相壓降隨質量速度與潤滑油含油量增加而增加。在實驗範圍內，總增強比的值在3.12 ~ 3.60之間，這表示管中具繞花絲能夠有效地強化了管內熱傳且為最佳之熱傳增強工具，其次分別為螺旋線圈、螺旋彈簧與扭帶型。最後，本研究之熱傳關係式也被建立。

This study reports an experimental investigation of heat transfer and pressure drop behavior during evaporation of R-290 and R-600a mixed with the lubricating oil (150SUS) in the micro-fin tubes within four different inserts (twined coil, wire coil, twisted tape, and helical-coil). The test were conducted at the saturation temperature of 15 , inlet oil concentration from 0 to 5 mass% oil, mass flux of 200 – 500 and the heat flux of 10.24 .
The evaporation heat transfer coefficients for the present study display a common trend in that the heat transfer coefficient increases as the mass velocity increases and as the lubricant concentration decreases. In addition, the two-phase pressure drop increase with an increases of the mass flow rate and the lubricant concentrations. The overall enhancement ratio ranged from 3.12 to 3.60, which indicates that the twined coil in micro-fins tubes enhances heat transfer effectively. The micro-fins tubes within twined coil insert has the best heat transfer performance, the others are wire coil, helical-coil, and twisted tape inserts, respectively. More, empirical correlations to estimate the evaporation heat transfer coefficients for the present hydrocarbons mixed with the lubricating oil have been developed.

第一章 緒論 ------------------------------------------------------------------------- 1
1-1 研究背景 ------------------------------------------------------------ 1
1-2 研究目的 ------------------------------------------------------------ 3
1-3 文獻回顧 ------------------------------------------------------------ 3
1-4 研究範圍 ---------------------------------------------------------- 13
第二章 實驗方法 ------------------------------------------------------------------ 15
2-1 實驗系統 ------------------------------------------------------------ 15
2-1.1 測試段 ------------------------------------------------------- 15
2-1.2 冷媒循環系統 ---------------------------------------------- 16
2-1.3 水循環系統 ------------------------------------------------- 16
2-2 實驗量測設備 ------------------------------------------------------ 17
2-2.1 溫度量測 ---------------------------------------------------- 17
2-2.2 壓力量測 ---------------------------------------------------- 17
2-2.3 流量量測 ---------------------------------------------------- 18
2-2.4 資料收集系統 ---------------------------------------------- 18
2-3 實驗過程 ------------------------------------------------------------ 18
2-3.1 系統測漏 ---------------------------------------------------- 18
2-3.2 系統冷媒填充 ---------------------------------------------- 19
2-4 實驗範圍 ------------------------------------------------------------ 19
2-5 研究步驟 ------------------------------------------------------------ 20
2-6 資料換算 ------------------------------------------------------------ 20
2-6.1 熱傳資料換算 ---------------------------------------------- 21
2-6.2 兩相壓降資料換算 ---------------------------------------- 23
2-6.3 油集中度 ---------------------------------------------------- 24
第三章 結果與討論 --------------------------------------------------------------- 35
3-1 單相熱傳 ------------------------------------------------------------ 35
3-2 平滑管熱傳係數與經驗公式比較 ------------------------------ 35
3-3 不同內插物間熱傳係數、壓降及效益評估之比較 --------- 36
3-3.1 熱傳係數之比較 ------------------------------------------- 36
3-3.2 管內壓降之比較 ------------------------------------------- 42
3-3.3 效益評估 ---------------------------------------------------- 44
3-3.4 熱傳係數經驗公式 ---------------------------------------- 47
第四章 結論與建議 --------------------------------------------------------------- 72
參考文獻------------------------------------------------------------------------------ 74
附錄A 誤差分析-------------------------------------------------------------------- 79

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