臺灣博碩士論文加值系統

吸收器在吸收式冷卻系統中是相當重要的一環，因為其對於整體之效能有著極為顯著的影響。就吸收器而言，吸收劑以下落液膜之形式運作於吸收器表面藉以增加與水氣接觸之面積並提高吸濕率，而眾多文獻也指出波動液膜之吸濕效率較平滑液膜為佳。本研究主要是設計一波動液膜產生裝置，探討擾動頻率與吸濕率之關係，並嘗試用雷射位移感測計將擾動頻率對液膜之影響作定性分析。結果顯示當擾動頻率在30Hz吸收器具有最佳之吸濕效率。根據流場觀測及雷射位移感測器之訊號，顯示出在此頻率下波動液膜約為二維波之型態且具有較大之振幅。

The absorber plays a fairly important role in the absorption
refrigeration system because it significantly influences the performance of the entire system . For an absorber , the absorbent is falling in form of liquid film in order to increase the contact area with the water vapor and , therefore , the absorption rate . Numerous studies have indicated that wavy films result in better absorption rate than smooth laminar films . The aim of the present research is to design a device to trigger wave films falling on a flat plate absorber of a lithium bromide absorption refrigeration system , and to investigate the relation between the absorption rate and the frequency of disturbance . Effects of the controlled-disturbance on the liquid films are studied qualitatively using a laser displacement sensor . Results show that the best absorption rate is presented at the disturbing frequency of 30Hz . Observations of the flow field and the signals of the laser displacement sensor show that , at this frequency , solitary waves are approximately two-dimensional and have large amplitudes .

摘要 I
Abstract II
致謝 III
符號說明 XI
第一章 緒論 1
1-1 研究背景及目的 1
1-2 吸收式冷凍系統介紹 2
1-2-1 吸收式冷凍系統運作原理 2
1-2-2 吸收式冷凍系統P-T-x圖 3
1-3 文獻回顧 5
1-3-1 溴化鋰吸收式冷凍系統實驗 5
1-3-2 液膜動力學 6
1-4 二氧化鈦塗佈 7
1-5 本文架構 8
第二章 實驗設計與原理 10
2-1 實驗設備 10
2-1-1 液膜擾動裝置設計 11
2-1-2 平板型吸收器 11
2-1-3 吸收器腔體 12
2-1-4 脫汽器 12
2-1-5 蒸汽產生器 12
2-1-6 熱交換器 13
2-1-7 各式汞浦 13
2-1-8 溶液儲槽 14
2-1-9 量測儀器及工具 14
2-2 溴化鋰水溶液之性質與管理 24
2-2-1 溴化鋰水溶液之性質 24
2-3 吸濕原理 28
2-3-1 水汽吸收率 29
2-3-2 總熱傳率 29
2-3-3 不可凝結氣體對熱傳之影響 31
2-4 二氧化鈦塗佈對於親水性之影響 32
2-5 雷射位移感測計量測原理 33
2-6 液膜動力學 33
第三章 實驗架構與流程 39
3-1 波動液膜之拍攝與量測實驗架構 39
3-1-1 二氧化鈦塗佈 40
3-1-2 波動液膜拍攝實驗 43
3-1-3 波動液膜量測實驗 45
3-2 吸收器吸濕實驗流程 47
第四章 結果與討論 49
4-1 波動液膜之拍攝與量測實驗結果 49
4-1-1 波動液膜拍攝結果 49
4-2 吸收器吸濕實驗結果 59
4-2-1 吸濕熱傳實驗結果 59
4-2-2 液膜厚度量測 65
第五章 結論與未來展望 70
5-1 結論 70
5-2 未來展望 71
參考文獻 73
附錄A溴化鋰溶液性質及函數關係式[30] 78
附錄B擾動裝置水槽之設計圖 80

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