研究生: |
鄧敦平 Tun-Ping Teng |
---|---|
論文名稱: |
蒸汽壓縮機械過冷卻系統提升冷凍機性能之研究 Research on Improving Performance of Refrigeration by Mechanical-Subcooling Vapor-Compression System |
指導教授: |
陳明堂
Chen, Ming-Tang 卓清松 Jwo, Ching-Song |
學位類別: |
碩士 Master |
系所名稱: |
工業教育學系 Department of Industrial Education |
論文出版年: | 2001 |
畢業學年度: | 89 |
語文別: | 中文 |
論文頁數: | 140 |
中文關鍵詞: | 過冷卻 、性能係數 、毛細管 、關連度分析 、回歸方程式 |
英文關鍵詞: | subcooling, coefficient of performance, capillary tube, analysis of correlation, regression equation |
論文種類: | 學術論文 |
相關次數: | 點閱:567 下載:57 |
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摘 要
本研究旨在探討蒸汽壓縮機械過冷卻對於冷凍機性能提升的關係。基於此一目的,本研究首先針對過冷卻溫度對各系統溫度參數的影響加以探討,並進一步分析過冷卻溫度對各系統性能係數與消耗電力的影響,根據分析結果提出解決耗能問題的運轉模式。
本研究首先探討相關文獻,作為研究理論基礎,並針對蒸汽壓縮循環各部組件進行探討。本研究經由各種液管過冷卻學說進行分析與討論,選定外部液管過冷卻系統的形式,分析其性能提升的相關之理論,並進行過冷卻對冷凍庫性能係數的模擬評估。在節流元件方面,主系統仍使用原本廠商安裝的熱膨脹閥,過冷卻系統的節流元件則是使用毛細管,毛細管的相關設計是參考相關文獻的推導與圖表配適法進行R-134a冷媒毛細管設計與分析,並實際使用在過冷卻系統上。
本研究主要發現與結論如下:(一)由關連度分析中發現,過冷卻影響最大者是蒸發器、冷凝器冷媒側與壓縮機的溫度,並非只是單純的增加液管焓差,提升COP而已,其它的系統因數也受到相當的影響,值得後序研究者的重視。(二)就全系統性能係數COPtotal而言,利用二次回歸方程式延伸過冷卻溫度範圍可以發現,在本實驗條件之下,液管溫度在2℃時有最佳性能係數,再增加過冷度,全系統性能係數COPtotal反而下降。(三)至於全系統消耗電力KWtotal方面,液管溫度在15℃時,有最低全系統消耗電力,再增加過冷度,消耗電力反而會隨之上升。在本實驗的過冷卻溫度範圍中,全系統的性能係數確實能獲得提升,使得理論與實際的相關性得以證明,並依據研究結果提出若干建議以供後序研究者參考。
關鍵詞:過冷卻、性能係數、毛細管、關連度分析、回歸方程式
Abstract
This subject is the study of the relationship between subcooling of liquid refrigerant and promotion of performance of refrigerator. For this purpose, the effects of subcooling temperature on the parameters of the system were discussed firstly in this subject, and then the effects on parameters and consumption of electric power were analyzed. Furthermore, an operational model was proposed to solve the problem of energy consuming according to the result of the analysis.
The mainly discoveries and conclusions in this context are as follows. First, from the analysis of correlation, there are great effects of subcooling on the temperature of the evaporator, the refrigerant of condenser and compressor. Furthermore, it do not only increase the difference in enthalpy of the liquid pipe to promote COP, but also quite affects other systematic factors, which is worth being studied by the following researchers. Second, as to the coefficient of the totally systematic performance, COPtotal, it was found that there was the best COPtotal at 2℃ of temperature of the liquid line under this experimental condition but COPtotal decreased for the lower subcooling temperature by utilizing regression equations to extend the range of subcooling temperature. Third, as to the consuming electric power of the total system, KWtotal, there was the lowest KWtotal at 15℃ of temperature of the liquid line but KWtotal increased for the lower subcooling temperature. Therefore, it was found that the COP of this system could be promoted actually within the range of subcooling temperature in this experiment, and thus the correlation between theory and practice was proved, so some suggestions based on the results of this study could be references for the following researchers.
Key words: subcooling, coefficient of performance, capillary tube, analysis of correlation, regression equation
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