近年來，由於工業的發展與科技的進步，對於能源的需求與日俱增，造成環境破壞、氣候的變遷、全球暖化等現象日益嚴重，且空調系統在大多數工業化國家的能源需求不斷增加，導致太陽能空調系統越來越受到重視，而目前吸收式冷凍空調系統較為普遍使用，主要是利用熱源來驅動，不僅可以舒緩用電尖峰，且對環境友善有助於減少二氧化碳的排放，達到節能省碳的目的。
本文研究吸收式空調系統使用溴化鋰水溶液作為工作流體，利用數值方法模擬二維再生器內部流場之熱質傳，在再生器中工作流體沿著垂直管壁以波狀薄膜流向下滑落，流經管壁加熱將工作流體將冷媒(水)蒸發出來，使溶液再生回濃溶液，探討脫收過程之熱質傳，探討再生器不同條件下對脫收效果之影響，影響參數有入口流率、入口溫度、壁面溫度、冷凝器蒸氣壓，並與平滑流脫收過程作比較。
從研究結果發現，波狀流脫收過程之熱質傳較平滑流為佳，且在工作流體流率較高的狀態下，脫收效果越好，且與平滑流的脫收效果差異越明顯；相同條件下，在低流率下入口溫度對質量脫收效果影響不大，必須達到一定的流率才開始對質量脫收率有明顯的影響，而管壁溫度越高與蒸氣壓壓差越大對其質量脫收效果越顯著。

This thesis is aimed to study the heat and mass transfer performance of a generator for the absorption cooling system using lithium bromide/water solutions. A two-dimensional numerical simulation has been performed in order to investigate heat and mass transfer in desorption process, for a wavy film flowing down on a vertical wall in generator.
Desorption rate is depending on the parameters ,including inlet temperature, heat source (wall) temperature, vapor pressure consistent with the saturation pressure of the condenser and solution flow rate.
Results are compared with the results of smooth film desorption process. As espected the desorption rate of the wavy film is higher. The desorption rate increases with reducing vapor pressure, increasing heat source temperature and increasing Reynolds number. The results of the present study provide important design references for absorption cooling systems.

目 錄 III
圖目錄 V
表目錄 VII
摘要 VIII
Abstract X
符號說明 XI
第一章 緒論 1
第一節 前言 1
第二節 吸收式空調系統之簡述 2
第三節 文獻回顧 4
第四節 研究動機與目的 9
第二章 基礎理論 13
第一節 物理模型 13
第二節 基本假設 13
第三節 統御方程式 (Governing Equation) 14
第四節 邊界條件 15
第五節 座標轉換 16
第三章 數值方法 19
第一節 前言 19
第二節 方程式離散化 19
第三節 差分方程式的解法與計算流程 21
第四節 質量脫收率之計算 23
第五節 網格數量測試與分析 24
第六節 時間步測試與分析 25
第四章 結果與討論 31
第一節 溴化鋰水溶液溫度及濃度分布及變化情形 32
第二節 進口流速的影響 32
第三節 波狀流與平滑流之比較 33
第四節 進口溫度的影響 33
第五節 壁面溫度的影響 34
第六節 蒸氣壓力的影響 34
第七節 熱質傳遞的關係式 35
第五章 結論 65
參考文獻 67
附錄 71

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