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(丙烷)與R-600a(異丁烷)-潤滑油混合物流經不同彎道數(U-bend)之蛇狀細管( )之冷凝熱傳與兩相壓降特性之實驗研究。實驗量測含油濃度為0~5%、質量速度為 、飽和溫度為40°C、熱通量為 。
實驗結果顯示，冷凝熱傳係數隨著質量速度、蛇狀細管之彎道數目增加而增加。隨著添加潤滑油濃度增加而減少。管內兩相壓降隨著質量速度、蛇狀細管之彎道數目增加與潤滑油含量增加而增加。

This study presents an experimental investigation of the characteristics of condensation heat transfer and pressure drop for hydrocarbon refrigerant of R-290 (propane) and R-600a (isobutane)-oil mixtures flowing in the different numbers of serpentine small-tube bands having an inside diameter of 2.54 mm. These measurements were performed for refrigerant-lubricant mixtures ranging from 0 to 5% lubricant concentrations, the mass flow flux for refrigerant-oil mixtures ranges from 300 to 600 , the saturation temperature was 40°C and the heat flux was 40 .
The experimental results show that the condensation heat transfer coefficient were increased in the mass flow rate and the numbers of bends tube, but it decreased in the lubricant concentrations. In addition, the two–phase pressure drops were increased in the mass flow rate、the numbers of bends tube and the lubricant concentrations.

目錄iii
表目錄v
圖目錄vi
符號說明ix
第一章 緒論1
1-1前言1
1-2文獻回顧4
1-2.1冷凝熱傳4
1-2.2管內壓降6
1-3研究目的10
第二章 實驗方法14
2-1 實驗系統14
2-1.1 測試段14
2-1.2 冷媒循環系統15
2-1.3 水循環系統16
2-2 實驗量測設備16
2-2.1 溫度量測17
2-2.2 壓力量測17
2-2.3 流量量測17
2-2.4 資料收集系統17
2-3 實驗過程18
2-3.1 系統測漏18
2-3.2 系統冷媒填充18
2-4 實驗步驟19
2-5 資料換算19
2-5.1 熱傳資料換算20
2-5.2 兩相壓降資料換算23
2-5.3 油集中度35
第三章 結果與討論37
3-1 冷凝熱傳37
3-2 兩相壓降特性43
第四章 結論與建議59
參考文獻62
附錄A 誤差分析65

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