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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 蘇金佳 | |
dc.contributor.author | Yung-Chia Chang | en |
dc.contributor.author | 張詠佳 | zh_TW |
dc.date.accessioned | 2021-06-17T00:44:49Z | - |
dc.date.available | 2013-02-08 | |
dc.date.copyright | 2012-02-08 | |
dc.date.issued | 2011 | |
dc.date.submitted | 2012-01-09 | |
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【2】 江明德,“地下輸電電纜洞道冷卻系統暨氣流模擬研究”,國立台北科技大學冷凍空調工程研究所碩士論文,2004年。 【3】 J. V. Herraez, R. Belda, “A study of free convection in air around horizontal cylinders of different diameters based on holographic interferometry. Temperature field equations and heat transfer coefficients”, International Journal of thermal Sciences, Vol. 41, 2002, pp.261-267. 【4】 W. Hauff, U. Grigull, “Optical Methods in Heat Transfer”, Advances in Heat Transfer, Academic Press, New York, 1970, pp.133-366. 【5】 J. A. Peterka, P. D. Richardson, “Natural convection from a horizontal cylinder at moderate Grashof numbers”, International Journal of Heat and Mass Transfer, Vol. 12, 1969, pp.749-752. 【6】 A. O. Elsayed, E. Z. Ibrahim, Sayed A. Elsayed, “Free convection from a constant heat flux elliptic tube”, Energy Conversion and Management, Vol. 44, Issue 15, 2003, pp.2445-2453. 【7】 Y. M. Chen, K. C. Wang, “Numerical and experimental studies on natural convection from a horizontal elliptic cylinder”, Journal of the Chinese Institute of Chemical Engineers, Vol. 27, No. 5, 1996, pp.353-362. 【8】 Fieg GP, Roetzel W, “Calculation of Laminar-Film condensation in/on Inclined Elliptic Tubes”, International Journal of Heat and Mass Transfer, Vol. 37, No. 4, 1994, pp.619-624. 【9】 H.M. Badr, K. Shamsher, “Free convection from an elliptic cylinder with major axis vertical”, International Journal of Heat and Mass Transfer, Vol. 36, No. 1414, 1993, pp.3595-3602. 【10】 王正健,“水平圓管內冷熱圓柱間自然對流現象之實驗研究”,國立成功大學機械工程研究所碩士論文,1990年。 【11】 O. Aydm, “Transient natural convection in rectangular enclosures heated from one side and cooled from above”, International Communications in Heat and Mass Transfer Vol. 26, Issue 1, January 1999, pp.135-144. 【12】 M. Sadegh Sadeghipour, Yazdan Pedram Razi, “Natural convection from a confined horizontal cylinder: the optimum distance between the confining walls”, International Journal of Heat and Mass Transfer, Vol. 44, 2001, pp.367-374. 【13】 G. F. Marsters, “Natural convection heat transfer from a horizontal cylinder in the presence of nearby walls”, The Canadian Journal of Chemical Engineering Vol. 35, 1975, pp.144-149. 【14】 E. Sparrow, D. Pfeil, “Enhancement of natural convection heat transfer from a horizontal cylinder due to vertical shrouding surfaces”, ASME Journal of Heat Transfer Vol. 106, 1984, pp.124-130. 【15】 E. H. Ridouane, Antonio Campo, “Free convection performance of circular cavities having two active curved vertical side and two inactive curved horizontal sides”, Applied Thermal Engineering Vol. 26, 2006, pp.2409-2416. 【16】 G.D Raithby, K.G.T Hollands, Natural Convection, in:W.M. Rohsenow et al.(Eds), Handbook of Heat Transfer, third ed.,McGraw-Hill, New York, 1998(Chapter 4). 【17】 Y.Jaluria, Natural Convection, in: A. Bejan, A.D.Kraus(Eds.), Heat Transfer Handbook, John Wiley, New York, 2003(Chapter 7). 【18】 Arnab Kumar De A. Dalal, “A numerical study of natural convection around a square, horizontal, heated cylinder placed in an enclosure”, International Journal of Heat and Mass Transfer Vol. 49, 2006, pp.4608-4623. 【19】 B.S Kim, D.S Lee, M.Y.Ha, H.S Yoon, “A numerical study of natural convection in a square enclosure with a circular cylinder at different vertical locations”, International Journal of Heat and Mass Transfer Vol. 36, 2008, pp.1888-1906. 【20】 M. Hayashi, K. Uchida, W. Kumai, K. Sanjo, M. Mitani, N. Ichiyanagi, and T. Goto, “Development of water pipe cooling system for power cables in tunnels”, IEEE Transations on Power Delivery, Vol. 4, No. 2, April 1989. 【21】 李四川,“共同管道及電力輸電線冷卻節能系統之研究”,國立台北科技大學電機工程研究所碩士論文,2001年。 【22】 財團法人中華顧問工程司,“台灣電力公司仙渡345 kV地下電纜工程規劃設計工作服務建議書”,2001年。 【23】 杜文祥,“地下電纜洞道內冰水管間接冷卻系統之性能研究”,國立台灣大學機械工程研究所碩士論文,2006年。 【24】 何柏慶,“半圓洞道內冰水管間接冷卻系統之自然對流熱傳研究”,國立台灣大學機械工程研究所碩士論文,2007年。 【25】 劉彥宏,“半圓洞道內線性熱源位置對剖面溫度的效應”,國立台灣大學機械工程研究所碩士論文,2009年。 【26】 鄭易林,“全圓洞道內線性熱源位置對剖面溫度的效應”,國立台灣大學機械工程研究所碩士論文,2009年。 【27】 楊鴻輝,“全圓洞道內具單線性熱源之冰水管間接冷卻系統之自然對流熱傳研究”,國立台灣大學機械工程研究所碩士論文,2010年。 【28】 吳金瑞,“圓形洞道內雙線性熱源位置對於剖面溫度之效應”,國立台灣大學機械工程研究所碩士論文,2010年。 【29】 中央氣象局全球資訊網“統計資料-氣候統計”<http://www.cwb.gov.tw/>。 | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/66587 | - |
dc.description.abstract | 對於人口密集度較高的地區,傳統高架電纜線對人類造成的危害逐漸增加,故高架電纜線地下化已經是時勢所趨,而地下纜線在輸送電力時,會產生大量的熱量,國內目前仍缺乏在如何將這些熱量排除之研究,因此本研究以一實體水泥洞道來模擬地下洞道、棒狀加熱器模擬電纜線發熱、以間接水冷的方式作為洞道內之冷卻系統。
實驗中之操作變因如下:五種冷水管位置(A、B、C、D、E)、室溫範圍(17℃~31.1℃)、加熱器位置(30゚、120゚)、加熱器功率700W、總冷水管流量7.5LPM、冷水管管數(雙管、三管、四管)。分別調整至所需條件後,以數個熱偶線量測洞道內某一剖面以及冷水出入口水溫,以溫度記錄器儲存數據,最後將各點數據加以繪圖及分析。 在不同室溫的情況下發現,當室溫越高,冷水管所帶走之熱量增加,壁面所散失之熱量減少,因此對於不同室溫,相同冷水管配置條件下,無法對冷水管最佳配置做判斷,必須以某一室溫範圍,使得剖面溫度變化不受到室溫之影響;在冷水管管數為三,加熱器位置為120゚,固定某一室溫範圍下,得到冷水管最佳配置情況為ACE;冷水管管數為四,加熱器位置為120゚及30゚時,最佳配置分別為ACDE以及BCDE;接著對於不同室溫範圍,冷水管管數為四,得到相同之最佳配置。 最後因在多冰水管之實驗中,往往需要耗費相當多時間以得到所有數據,因此嘗試著以較少冷水管管數之實驗,來預測多冰水管之最佳配置,且以多組數據加以驗證。 | zh_TW |
dc.description.abstract | In high population density areas, the risks from overhead electric cables to human health are increasing. As a result, replacing traditional overhead cables with underground cables are needed. However, the cables will produce large amount of heat in the underground tunnel. The research of cooling down the sewer system is still lacking in Taiwan. Therefore, this research utilizes a cement tube to simulate the environment of a sewer system, heat sticks which work as the cables in the system, and water for indirect cooling in the sewer system.
Controls in the experiment are five positions of the water pipe in the cement tube (A, B, C, D, E), range of room temperature (17℃ to 31.1℃), site of the heat stick(30゚ and 120゚), power of the stick - 700W, flow rate (7.5LPM), and the numbers of the pipe (two, three, four ). After these controls have been adjusted, thermocouple wires that are installed in the cement tube detect the temperature of three different sections: a random cross section, the entry, and the exit of the water pipe. We then analyze the plot which is built from the data from the sensors. In different room temperatures we found that the higher the room temperature the more heat the water pipe can cool, we also found that the heat which is dissipated by the air surrounding the tube is diminished. Thus, for different room temperatures and the same pipe placement, we cannot optimize the placement of the cooling pipes. It must remain within the certain range of room temperature, so the temperature which is measured from a random cross section will not be affected by room temperature. Within the specific temperature range, the number of pipes is three, the heat stick is placed approximately 120゚ from the top of the tube, and we found that the optimal positions of the pipes is ACE. We then changed the number of the pipe to four and placed heat sticks in position 120 and 30 degrees from the top of the tube. In this condition, the optimizations of four pipes are ACDE and BCDE. Next, we continue to place four pipes in the tube, but within different range of room temperatures. We got the same optimizations which are ACDE and BCDE. We used the data from the experiment which is using less pipes to simulate and prove the optimizations of multiple cooling pipes, because of the experiment which is utilizing multiple pipes needs to spend a lot time to obtain all data. | en |
dc.description.provenance | Made available in DSpace on 2021-06-17T00:44:49Z (GMT). No. of bitstreams: 1 ntu-100-R99522115-1.pdf: 4626188 bytes, checksum: 0bba43be757045a04820a14376534b89 (MD5) Previous issue date: 2011 | en |
dc.description.tableofcontents | 摘要 I
Abstract II 目錄 IV 表目錄 VII 圖目錄 VIII 符號說明 XIII 第一章緒論 1 1.1研究背景 1 1.2研究動機 1 1.3研究目的 3 第二章 文獻回顧 4 2.1管狀熱源之自然對流 4 2.2封閉熱源 5 2.3地下洞道熱傳之研究 8 第三章 實驗設備與方法 12 3.1洞道主體 12 3.2冷水循環系統 12 3.2.1 冷水主機 13 3.2.2系統循環泵 13 3.2.3入出口分流管與旁通(by pass) 13 3.2.4儲水槽與補水裝置 13 3.2.5不鏽鋼水管 14 3.3加熱設備 14 3.3.1棒狀乾式加熱器 14 3.3.2自耦變壓器 14 3.4電控設備 15 3.5量測設備 15 3.5.1溫度量測元件 15 3.5.2流量量測元件 16 3.6實驗變因 16 3.7實驗流程 16 3.8數據分析 17 第四章 結果與討論 19 4.1室溫對洞道內自然對流之影響 19 4.1.1室溫對剖面溫度之影響 19 4.1.2室溫對冷水管冷卻效率之影響 22 4.2三支冷水管之最佳佈設位置 23 4.3四支冷水管之最佳佈設位置(Φ=120℃) 26 4.4冷水管較佳配置之預測 28 4.5加熱器位置及室溫對最佳配置之影響 30 第五章 結論與建議 32 5.1結論 32 5.2建議 33 參考文獻 34 附錄A 誤差分析 100 附錄B 流量計校正 102 附錄C 熱偶線溫度校正 104 | |
dc.language.iso | zh-TW | |
dc.title | 圓形洞道內單線性熱源對剖面溫度之效應 | zh_TW |
dc.title | Effect of Single Linear Heat Source on Cross-Section Temperature Distribution in a Circular Tunnel | en |
dc.type | Thesis | |
dc.date.schoolyear | 100-1 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 謝曉星,黃智勇,李昭仁,李奕昇 | |
dc.subject.keyword | 自然對流,圓形封閉空間,地下洞道,間接水冷,單線性熱源, | zh_TW |
dc.subject.keyword | natural convection,circular enclosure,underground tunnel,indirect water cooling,single linear heat source, | en |
dc.relation.page | 111 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2012-01-10 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 機械工程學研究所 | zh_TW |
顯示於系所單位: | 機械工程學系 |
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