跳到主要內容

臺灣博碩士論文加值系統

(34.226.244.254) 您好!臺灣時間:2021/08/03 04:03
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:陳育涵
研究生(外文):Yu-Han Chen
論文名稱:週期性擺動葉片對具有入出口的正方形容器內熱傳與質傳之影響
論文名稱(外文):The Effect of a Guide Vane with Periodic Swing on the Heat and Mass Transfer within a Square Cavity with Inlet and Outlet Ports
指導教授:施陽正
口試委員:董雲春楊安石
口試日期:2012-06-14
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:能源與冷凍空調工程系碩士班
學門:工程學門
學類:其他工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:78
中文關鍵詞:熱質傳紐賽數雪伍德數計算流體力學動態網格
外文關鍵詞:Heat and mass transferNusselt numberSherwood numberComputational Fluid Dynamics (CFD)Dynamic Mesh
相關次數:
  • 被引用被引用:1
  • 點閱點閱:113
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
過去的空調設計主要目的著重於室內溫度控制,使得室內環境可以達到冬暖夏涼,但隨著時代的進步,空調的功能不再僅止於提供冷房舒適,室內空氣品質不佳也經常造成人體健康的危害,所以近年來室內空氣品質便成了研究室內空調重要的一環。目前國內外的研究大多局限於噴流對室內空間穩態流場的影響,對動態流場的文獻分析甚少,然而實際環境下卻是送風葉片不斷的擺動,因此增設一具有週期性擺動之送風葉片,可改變進風風向及增加室內空間內流體的流動性,並有效排除室內空間的熱源及污染源並達到所謂健康空調的要求。本文利用計算流體力學軟體FLUENT模擬週期性擺動之送風葉片在不同振幅與頻率下對空間內壓損及熱質傳之影響。由模擬結果之流線圖得知隨著葉片向上擺動角度越大時,因噴流誘導可增加室內空間氣流流動;隨著葉片向下擺動角度越大時,渦流的強度(或尺寸)會逐漸增強,影響室內空間氣流流動。最後探討頻率與振幅對室內空間氣流之影響,發現固定頻率比較不同振幅下,擺動振幅15 o時有較低的壓損及較佳的熱質傳性能;固定振幅比較不同頻率下發現當頻率越大時葉片擺動的速度越快則空間內的渦流的強度(或尺寸)會逐漸增強,造成空間內熱質傳性能變差。

Air-conditioning in earlier days mainly focused on the control of indoor air temperature for improving the year-round indoor environment. With the development of our modern society, the function of air-conditioning no longer just provides the desired thermal comfort in the indoor space. Poor indoor air quality (IAQ) in the air-conditioned indoor space often results in human health hazards, and the IAQ issue has become one of the most important research topics in the HVAC industry recently. Most previous studies mainly focused on the effect of air jets on the steady flow in the space. Little research on the dynamic flow field was published. However, in reality, the air-supply is projected with the simultaneously swinging guide vane. Therefore, the addition of an air-supply guide vane with periodic swinging motion helps to project the direction of wind flow and increase the mobility of indoor air, and thus can effectively extract both the heat and pollution sources in the space and achieve the healthy air-conditioning requirements. In this study, the CFD software-FLUENT was applied to simulate the effects of periodic swinging frequency and amplitude of air-supply guide vane on the pressure loss, heat and mass transfer. Based on the results, with the increasing upward swinging angle of guide vane, the streamlines indicated that the projected air jets will induce air motion better in the space and increase the mobility of indoor air. Adversely, the strength of the vortex (or size) will gradually increase and affect the air flow in the space with the increasing downward swinging angle of guide vane. It is also found that the varied frequency and amplitude of the swinging guide vane have important impact on the air flow in the space. For varied swinging amplitude and fixed frequency, the case with swinging amplitude of 15 o shows lower pressure loss and better heat and mass transfer performance. Meanwhile, for varied swing frequency and fixed amplitude, the strength of the vortex (or size) will gradually increases within the space as the guide vane swings faster (with higher frequency) , resulting in the deterioration of heat mass transfer performance within the indoor space.

摘 要 ....................................... i
ABSTRACT ........................................... ii
誌 謝 .................................................. iv
目 錄 .................................. v
表目錄 .............................. vii
圖目錄 ...................................... viii
第一章 緒論 ............................................. 1
1.1 前言 .............................................. 1
1.2 文獻回顧 ........................................... 2
1.3 研究目的 ......................................... 4
第二章 統御方程式 .................................... 5
2.1 幾何外形 ......................................... 5
2.2 統御方程式 ......................... 6
2.3 格點獨立分析 ............... 9
第三章 數值模式 ........................ 11
3.1 統御方程式 ........................ 11
3.2 數值方法 .............................. 12
3.2.1 對流–擴散方程式的差分形式 ............................. 12
3.2.2 壓力–速度耦合關係的處理 ....................... 13
3.3 動態網格 (Deforming Mesh) ...................... 15
3.3.1 動態網格守?琱韏{式 ........................ 15
3.3.2 動態網格變化理論 ..................... 16
第四章 週期性擺動之送風葉片對室內空間氣流及污染物分佈之影響 ......... 20
4.1幾何形狀及邊界條件設定 ............................ 20
4.2週期性擺動葉片 ............................. 21
4.3模擬規劃 ............................. 23
4.4暫態收斂分析 .......................... 23
4.5結果與討論 ............................... 25
4.5.1 擺動葉片對室內空間氣流及污染物分佈影響 ........................ 27
4.5.2空間內區域性氣流分析 .......................... 41
4.5.3空間內壓損(Cp)及熱質傳性能(Nuf、Shf)之探討 ......................... 44
4.5.4擺動振幅對室內空間之影響 ................................................... 61
4.5.5擺動頻率對室內空間之影響 .................................................. 67
第五章 結論 ......................................... 73
5.1 總結 ....................................... 73
5.2 後續研究建議 ................................................ 74
參考文獻 ................................................ 75
符號彙整 ............................................... 77
希臘符號 .......................................... 78

[1] 趙文華,節約能源技術原理分析及實例應用,「空調技術-冰水主機」,2007
[2] 永續能源政策綱領,行政院經濟部能源局,2008。
[3] J. Xaman, A. Ortiz, G. Alvarez, and Y. Chavez, "Effect of a contaminant source(2CO) on the air quality in a ventilated room," Energy, vol.36, 2011, pp. 3302-3318.
[4] Awbi, H.B., “Ventilation of Buildings”, First Edition, E & FN SPON, 1991.
[5] Shih, Y.C., Chiang, H., and Shyu, R.J., “The Impact of the Coanda Effect on the Indoor Air Motion Generated by a Window-Type Air-Conditioner”, ROOMVENT’2000, 2000, pp. 9-12.
[6] S. M. Saeidi and J. M. Khodadadi, "Forced Convection in a Square Cavity with Inlet and Outlet Ports," Int. J. Heat Mass Transfer, vol.49, 2006, pp. 1869-1906.
[7] X. Shi and J. M. Khodadadi, "Laminar Fluid Flow and Heat Transfer in a Lid-Driven Cavity Due to a Thin Fin," J. Heat Transfer, vol.124, 2002, pp. 1056-1063.
[8] X. Shi and J. M. Khodadadi, "Laminar Natural Convection Heat Transfer in a DiffeRentially Heated SquaRe Cavity Due to a Thin Fin on the Hot Wall," J. Heat Transfer, vol.125, 2003, pp. 612-623.
[9] Qi-Hong Deng and Guang-Fa Tang, "Numerical visualization of mass and heat transport for mixed convective heat transfer by streamline and heatline" Int. J. Heat Mass Transfer, vol.45, 2002, pp. 2387-2396
[10] P.V. Nielsen, A. Restivo, and J.H. Whitelaw, "The Velocity Characteristics of Ventilated Rooms", J. Fluids Engineering, vol.100, 1978, pp291-298.
[11] I.P. Chung Derek Rankin, “Using Numerical Simulation to Predict Ventilation Efficiency in a Model Room”, Energy and Buildings vol.28, 1998, pp.43-50.
[12] Shuzo Murakami, Shinsuke Kato and Jie Zeng, “Combined Simulation of Airflow, Radiation and Moisture Transport for Heat Release from a Human Body”, Building and environment, Vol. 35, 2000, pp.489-500.
[13] 董鑫光,窗型空調機裝設位置出風方向及導板對冷房影響之研究,碩士論文,大同工學院機械工程研究所 碩士班 ,台北,2001。
[14] 葉永風,窗型冷氣機出風口隔板及整流器對冷房風面之效應,碩士論文,大同工學院機械工程研究所 碩士班,台北,1995。
[15] FLUENT User’s Guide, Version 6.3, FLUENT Inc, USA, 2006.
[16] B. Gebhart and L. Pera, "The nature of vertical natural convection flows resulting from the combined buoyancy effects of thermal and mass diffusion" Int. J. Heat Mass Transfer, vol.14, 1971, pp. 2025-2050.
[17] Qi-Hong, Jiemin Zhou, Chi Mei and Yong-Ming Shen, "Fluid, heat and contaminant transport structures of laminar double-diffusive mixed convection in a two-dimensional ventilated enclosure" Int. J. Heat Mass Transfer, vol.47, 2004, pp. 5257-5269.
[18] F. M. White, Viscous Fluid Flow 2nd Ed., New York: McGraw-Hill,.1986
[19] S. M. Saeidi and J. M. Khodadadi, "Transient flow and heat transfer leading to periodic state in a cavity with inlet and outlet ports due to incoming flow oscillation" ,Int. J. Heat Mass Transfer, vol.50, 2007, pp. 530-538.
[20] 邱正吉,隔離病房內部動態氣流模擬分析,碩士論文,國立臺北科技大學冷凍空調工程所 碩士班,台北,2004。
[21] 陳文豪,週期性擺動之送風葉片對室內空間氣流分佈的影響,碩士論文,國立臺北科技大學冷凍空調工程所 碩士班,台北,2011。
[22] X. Shi and J. M. Khodadadi, "Periodic state of fluid flow heat transfer in a lid-driven cavity due to an oscillating thin fin", Int. J. Heat Transfer, vol.48, 2005, pp. 5323-5337
[23] Brahim Ben Beya and Taieb Lili, "Oscillatory double-diffusive mixed convection in a two-dimensional ventilated enclosure" Int. J. Heat Mass Transfer, vol.50, 2007, pp. 4540-4553

連結至畢業學校之論文網頁點我開啟連結
註: 此連結為研究生畢業學校所提供,不一定有電子全文可供下載,若連結有誤,請點選上方之〝勘誤回報〞功能,我們會盡快修正,謝謝!
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top
無相關期刊