(3.235.25.169) 您好!臺灣時間:2021/04/17 18:57
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果

詳目顯示:::

我願授權國圖
: 
twitterline
研究生:黃棋模
研究生(外文):HUANG CHI MO
論文名稱:單一蒸發管結霜的研究
論文名稱(外文):The Study of Frost Formation on a Single Evaporating Tube
指導教授:葉榮華葉榮華引用關係廖世平廖世平引用關係
學位類別:碩士
校院名稱:國立海洋大學
系所名稱:導航與通訊系碩士班
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:91
語文別:中文
論文頁數:50
中文關鍵詞:結霜厚度傾斜角度最小平方法相對濕度
相關次數:
  • 被引用被引用:1
  • 點閱點閱:155
  • 評分評分:系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔
  • 下載下載:17
  • 收藏至我的研究室書目清單書目收藏:0
本研究使用實驗方法探討單一蒸發管在自然對流情況下,改變環境相對濕度、蒸發管的操作角度及通過蒸發管的冰水溫度下,觀察結霜厚度的變化情形。研究結果發現對影響結霜厚度及速度的幾個參數中,以管壁外表溫度為最大,其次為相對濕度,最後為蒸發管的傾斜角度。本研究並作數據整理,利用最小平方法找出理論預測之經驗公式,此最佳近似的方程式,在結霜過程20分鐘後,其相對誤差範圍在20%以內。本研究環境變數包括相對濕度ψ、管壁外表溫度 及蒸發管擺置角度θ,各變數的範圍分別為50%≦ψ≦70%,-20℃≦ ≦-10℃,0º≦θ≦90º。
The object of this paper is to study the frost formation on a single tube in free convection experimentally. In the experiments, the frost thickness was measured at different operating angles of the evaporating tube. The variables considered in this study include the relative humidity ratio of air, ψ, outside surface temperature of evaporating tube, , and the operating angle of the evaporating tube, θ. The ranges of the parameters considered in this study are:50%≦ψ≦70%, -20℃≦ ≦-10℃, 0º≦θ≦90º. The results show that outside surface temperature of evaporating tube is the main factor for the formation of frost other than relative humidity ratio and the operating angle of the evaporating tube. As the operating angle of the evaporating tube increases, the thickness of frost on a tube will increase too. By using least square method, empirical equations are obtained from experimental data and the relative errors of the predictions are within 20% after 20 minutes of frost formation process.
中文摘要-------------------------------------------Ⅰ
英文摘要-------------------------------------------Ⅱ
目錄-----------------------------------------------Ⅲ
表目錄---------------------------------------------Ⅴ
圖目錄 ---------------------------------------Ⅵ
符號說明------------------Ⅸ----------------Ⅵ Ⅸ
第一章 緒論 1
1-1前言 1
1-2文獻回顧 2
1-3實驗目的 11
第二章 實驗設備與方法 12
2-1實驗設備 12
2-1-1冷媒循環系統 12
2-1-2測試本體 13
2-1-3量測設備 13
2-1-4資料擷取系統 13
2-2實驗規劃 13
2-3實驗步驟 14
第三章 結果與討論 21
3-1結霜厚度之變化 21
3-2管壁外表溫度的影響 22
3-3空氣相對濕度的影響 23
3-4操作角度的影響 23
3-5交叉比較 23
3-5-1相對濕度與管壁外表溫度影響 23
3-5-2操作角度與相對濕度的影響 24
3-5-3操作角度與管壁外表溫度的影響 25
3-6經驗公式 26
第四章 結論 40
參考文獻 42
附錄一 數據分析 46
附錄二 不準度之分析 48
1.Stocker,W.F.,"Frost formation on refrigeration ", ASHRAE Trans., Vol.66, 1960.
2.Hayashi,Y., Aoki,A., Adachi,S., and Hori,K., " Study of frost properties correlating with frost formation types ", J. Heat Transfer,Vol.99,pp.239-245,1977.
3.Mason, B.J., "The physcis of clouds, 2nd ed , clarendon press", Oxford, 1971.
4. stin, R. and Andersson, S., "Frost growth parameter in a forced air stream ", Int. J. Heat Mass Transfer,Vol.34,Part4,pp.1009-1017,1991.
5.Hosda, T. N and Tree, D. R., Uzahashi, H., "Effects of frost on heat Transfer coefficient", Hitachi Review, Vol. 16 ,1967.
6.Yonko,J.D. and Sepsy,C.F., "An investigation of the thermal conductivity of frost while forming on a flat horizontal plate", ASHRAE Trans., Vol. 73, pp. I1.1-I1.11,1967.
7.Bilodeau,S., Brousseau,P., Lacroix,M. and Mevcadier,Y., "Frost formation in rotary heat and moisture exchangers", Int. J. Heat and Mass Trasfer., Vol.42,pp.2605-2619,1999.
8.Sahin, A. Z.," Effective thermal conductivity of frost during the crystal growth period" Int. J. Heat Mass Transfer, Vol .43,No.18, pp.539-553, 2000.
9.Parish,H.C. and Sepsy.C.F.,"A numerical analysis of the frost formation under forced convection", ASHRAE Trans., pp.236-251, 1972.
10.Jones,B.W. and Parker,J.D., "Frost formation with varying environmental parameter", J. Heat Transfer, Vol.97, pp.255-259,1975.
11.Sami, S. M. and Doung, T., "Mass and heat transfer during frost growth", ASHARE Trans., Vol.95, Part1, pp.158-165,1989.
12.Padki,M.M., Sherif,S.A. and Nelson,R.M.,"A simple method of modeling frost formation in different geometrics", ASHRAE Trans.,Vol.95 ,Part2,pp.1127-1137,1989.
13.Tao, Y.X., Besant, R. W., and Rezkalla, K,S., "A mathematical model for predicting the densification and growth of frost on a plate", Int. J. Heat and Mass Trasfer ., Vol.36,pp.353-363,1993.
14.Lee, K.S., Kim, W.S., and Lee, T.H., " One dimensional model for frost formation on a cold flat surface", Int. J. Heat Mass Transfer , Vol. 40, No.18, pp. 4359-4365,1997.
15.Le Gall, R., Grillot, J. M., and Jallut, C., " Modeling of frost growth and densification", Int. J. Heat Mass Transfer, Vol .40. No. 13.pp.3177-3187,1997.
16.Huang,C.H., "An inverse geometry problem in estimating frost growth on an evaporating tube", Heat&Mass Transfer., Spring-Verlag,2000.
17.Scander C.," The influence of frost formation and defrosting on the performance of air coolers", Ph. D. Dissertation, Technical University, Delft, Netherland ,1974.
18.O'Neal , D.L. and Tree, D.R., "Measurement of frost Growth and density in a parallel plate geometry", ASHRAE Trans., Vol.90, Part 2, pp.278-290,1989.
19.Storey, B. D., and Jacobi, A. M., " The effect of streamwise vortices on the frost growth rate in developing laminar channel flows", Int. J. Heat and Mass Transfer, Vol.42, pp.3787-3802, 1999.
20.Lüer, A . and Beer, H., " Frost deposition in parallel plate channel under laminar flow condition " Int. J. Therm. Sci. ,Vol. 39, pp.85-95,2000.
21.Raju, S. P., and Sherif, S. A., " Frost formation and heat transfer on circular cylinders in cross-flow", Int. J. Refrig., Vol.16, No.6 , pp. 390-402,1993.
22.Ismail, K. A. R., Salins C. S., and Goncalves, M. M., "Frost growth around a cylinder in a wet air stream", Int. J. Refrig., Vol.20, No.2 ,pp.106-119,1997.
23.Lee,Y.B. and Ro,S.T., "An experimental study of formation on a horizontal cylinder under cross flow", Int. J. Refrig., Vol.24, pp. 468-474,2001.
24.Bejan,A. and Vargas, J., " When to defrost a refrigerator, and when to remove the scale from the exchanger of a power plant", Int. J. Heat Mass Transfer, Vol .37,No.3,pp.523-532,1994
25.Molki,M., Ohadi,M.M. and Bloshteyn, M., " Frost reduction under intermittent electric field", Proceeding of NHTC'00 34th National Heat Transfer Conference , Pittsburgh , Pennsylvania ,August 20-22. 2000.
26.Kondepudi,S., Mural,K., Lorsch,H. and Bhalerao,A., "Voiding heat pump evaporator frost through the use of desiccants "ASME-JSES-JSME International Solar Energy Conference, New York ,part 1, pp.25-29,1995.
27.Kinsara,A., Elsayed,M. and Al-Rabghi, O., "Proposed energy-efficient air-conditioning system using liquid desiccants" , Applied Thermal Engineering , Vol.16, pp.179-806,1996.
28.Forst,T.W., "The adhesion of ice to low energy solids" paper 80-WA/HT-19, in ASME Winter Annual Meeting on Heat Transfer, Chicago, November, 1980.
29.McLaughin,W.J. and Webb,R.L., "Condensate formation and retention in louver fin automotive evaporators", paper 00HX-34,in:SAE 2000 World Congress , Detroit , MI , March 6-9,2000.
30.Okoroator,E.U. and Newborough,M., "Minimising frost growth on old surfaces exposed to humid air by means of crosslinked hydrophilic polymeric coatings", Applied Thermal Engineering , Vol.20, pp. 737-758 , 2000.
31.Wu,X.M. and Webb,R., ”Investigation of the possibility of frost release from a cold surface”, Experimental Thermal and Fluid Science,Vol.24, pp.151-156,2001.
32.王博文與胡興邦, "冷凍空調原理〔上冊〕"承美科技圖書有限公司,11版,1998.
33.Holman, J.P., "Heat Transfer", 8th ed.,McGraw-Hill, New York, 2000
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top
系統版面圖檔 系統版面圖檔