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:566 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
中文部分
王致平(民87)。一元雙級冷凍系統之分析與設計。國立台灣大學機械工程研究所碩士論文。
王啟川(民89)。套管式熱交換器。冷凍與空調雙月刊,4,69-82
王輔仁 編譯(民83)。冷凍工程原理設計與應用。台北:文京圖書有限公司。
古希人、劉威士、徐仁勳(民86)。工程名詞-機械工程篇,修訂12版。台北:科技圖書公司。
吳義兼(民81)。空調冷凍工程設計與施工(上)-(設計篇)。台北:徐氏基金會。
呂逸偉(民86)。溫度式膨脹閥對R-134a冷媒之冷凍系統研究。國立台灣大學機械工程研究所碩士論文。
李魁鵬(民84)。中間冷卻式冷凍循環之有限時間之熱力分析。國立成功大學機械工程研究所碩士論文。
卓清松(民86)。套裝儲冰式分離型冷氣機之開發研究。國立台灣大學機械工程學研究所博士論文。
林清山 (1992)。心理與教育統計學。台北:東華書局。pp.117-143
許豐智(民85)。不可逆冷凍循環之熱力分析。國立成功大學機械工程研究所碩士論文。
連錦杰 編著(民77)。冷凍工程。台北:大中國圖書公司。
連錦杰 編譯(民76)。空氣調節原理。台北:師友工業圖書公司。
郭誠恕、林振源(民89)。碳氫冷媒冰箱技術發展現況。冷凍與空調雙月刊,4,150-158。
郭誠恕、張文瑞、林振源(民88)。毛細管原理與性能測試。中華民國冷凍空調學會季刊,28, 34-43。
陳呈芳 編著(民84)。 熱力學概論。台北:全華圖書公司。
陳呈芳 譯(民75)。工程熱力學與應用。台北:東華書局。
陳芝九 著(1998)。製冷系統熱動力學。北京:機械工業出版社。
陳博文(民81)。精通冷凍空調自動控制。台北:千華出版公司。
陳博文(民82)。精通冷凍空調工程。台北:千華出版公司。
陳博文(民83)。精通冷凍空調設備製造,II-66-79。台北:千華出版公司。
陳銘章 編著(民88)。冷凍工程。台北:長諾資訊圖書公司。
楊政諭(民89)。淺談冰水主機之性能係數與設計。冷凍與空調雙月刊,4,100-107。
楊春欽 譯(民69)。熱傳遞學。台北:科技圖書公司。
楊敏雄(民87)。冷凍系統之熱性能分析。國立台灣海洋大學航運技術研究所碩士論文。
劉建志(民83)。冷凍循環有限時間之熱力分析。國立成功大學機械工程研究所碩士論文。
謝陽彬(民81)。冷凍工程。台北:全華科技圖書有限公司。
蘇金佳 譯(民84)。冷凍與空調。台北:國立編譯館。
英文部分
ALCO Controls. (1992). Components for the Refrigeration and Air-Conditioning Industry. ALCO Controls.
ASHRAE. (1992). HVAC System and Equipment. 1992 ASHRAE Handbook. American Society of Heating, Refrigeration & Air-conditioning Engineers.
ASHRAE. (1993). Fundamentals. 1993 ASHRAE Handbook. American Society of Heating, Refrigeration & Air-conditioning Engineers.
ASHRAE. (1994). Refrigeration. 1994 ASHRAE Handbook. American Society of Heating, Refrigeration & Air-conditioning Engineers.
ASHRAE. (1997). Fundamentals. 1997 ASHRAE Handbook. American Society of Heating, Refrigeration & Air-conditioning Engineers.
ASHRAE(1998). Refrigeration. 1998 ASHRAE Handbook. American Society of Heating, Refrigeration & Air-conditioning Engineers.
Bolstad, M. M. & Jorden, R. C. (1948). Theory and use of the capillary tube expansion device. Refrigeration Engineer. Vol.56,519.
Burghardt, M., David, H. & James, A. (1993). Engineering Thermodtnamics with Applications, 4ed. Harper Collins.
Chen, Z. H., Li, R. Y.., Lin, S. & Chen, Z. Y. (1990). A correlation for metastable flow of refrigerant 12 through capillary tubes. Int. J. Refrig. ,Vol.13, pp181-186 .
Cooper, L., Chu, C. K. & Brisken, W. R. (1957). .Simple select method for capillaries derived from physical flow conditions. Refrigerating. pp572-593.
Dongsoo, J., Chunkun, P. & Byungjin, P. (1999). Capillary tube selection for HCFC alternatives. International Journal of Refrigeration 22. pp.604-614.
Dossat , R. J. (1991). Principles of refrigeration-3rd. Prentice-Hall, Inc.
Fmills , A. (1999). Heat Transfer, 2ed. Prentice-Hall,Inc.
Khan , J. R. & Zubair, S. M. (2000). Design and rating of an integrated mechanical-subcooling vapor-compression refrigeration system. Energy Conversion&Management. 41,1201-1222.
Melo , C., Ferreira , R. T. S., Boabaid, N. C., Goncalves, J. M. & Mezavila, M. M. (1999). An experimental analysis of adiabatic capillary tubes . Applied Thermal Engineering 19, 669-684.
Stoecker, W. F. & Jones, J. W. (1982). Refrigeration and air conditioning. McGraw-Hill Publishing Company.
Taborek, J. (1998). Double Pipe and Multi-Tube Heat Exchanger. Heat.
Wang, S. K. (1994). Handbook of air condition and refrigeration. McGraw-Hill Publishing Company.
Whitman , W. C. & Johnson, W. M. (1991). Refrigeration & air conditioning Technology, 2ed. DELMAR Publishers INC.
Wolf, D. A. & Pate, M. B. (1995). Adiabatic capillary tube performance with alternative refrigerant. ASHRAE research project RP-762 .
Wolf, D. A. (1995). Adiabatic capillary tube performance with alternative refrigerant . ASHRAE, final report.
Wu, C., Chen, L., Sun, F. & Chen, W. (1995). General performance characteristics of a finite-speed carnot refrigerator. Applied Thermal Engineering, Vol.16. No.4, pp.299-303.