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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 | Hong-Huei Yang | en |
dc.contributor.author | 楊鴻輝 | zh_TW |
dc.date.accessioned | 2021-06-08T04:21:42Z | - |
dc.date.copyright | 2010-07-15 | |
dc.date.issued | 2010 | |
dc.date.submitted | 2010-07-08 | |
dc.identifier.citation | 【1】 台灣電力公司月刊第567期,P52-54。
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Part III: Experience From Practice And Experimental Work In Berlin (West)”, 7th IEEE/PES Tansmission and Distribution Conference and Exposition, April, 1979, pp. 1-6. 【48】 D. E. Williams, Dip. E.E., C. Eng., M.I.E.E., “Natural and forced-cooling of HV underground cables: UK practice”, IEE PROC, Vol. 129, Pt. A, No. 3, MAY, 1982 pp.137-161. 【49】 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. 【50】 W. Kumai, I. Hashimoto, S. Ohsawa, M. Mitani, Y. Matsuda, “COMPLETION OF HIGH-EFFICIENCY WATER PIPE COOLING SYSTEM FOR UNDERGROUND TRANSMISSION LINE”, IEEE Transactions on Power Delivery, Vol. 9, No. 1, January 1994. 【51】 M. Krarti and J. F. Kreider, “Analytical model for heat transfer in an underground air tunnel”, Energy Convers. Mgmt, Vol. 37, No. 10, 1996, pp.1561-1574. 【52】 J. A. Demko, J. W. Lue, M. J. Gouge, J. P. 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Sadokierski, Jean-Luc Tiffeault, “Heat Transfer in Underground Rail Tunnels”, eprint arxiv:0709.1748. 【59】 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,民國95年。 【60】 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,民國96年。 【61】 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,民國98年。 【62】 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,民國98年。 【63】 A. Bejan, “Convection Heat Transfer”, 3/E., WILEY, Inc., 2004. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/22591 | - |
dc.description.abstract | 封閉空間中自然對流之熱傳研究已經發展一段時間,常常被應用在實務工程上面,其中一項重要的應用是地下電纜洞道的冷卻系統,但是在台灣對地下電纜洞道的經驗不足,因此需要更多的文獻提供充足的資訊,使地下電纜洞道的設計與規劃更容易。對於地下電纜洞道而言,當電力在傳輸的過程中,必然會受到電阻的影響而產生熱能,故冷卻系統為不可或缺的部份;本研究使用大型圓形水泥管當作地下電纜洞道,以管狀加熱器模擬電纜線,由五支冰水管建構冷卻系統,本研究的目的在於使冷卻系統最佳化。
本實驗的操作變因包含冰水管五個位置(A,B,C,D,E)、加熱器的角度(30°, 60°,90°,120°)、加熱器的功率(1300,975,650 W)、冰水流量(4,8,12,15 LPM)以及冰水管管數;量測溫度方面使用T-type熱電偶線,架設於洞道下游近出口處之剖面,以取得較穩定的溫度。 在單支冰水管的實驗中,冰水管最靠近加熱器時具有最佳的冷卻效率,但此時局部高溫區比其他情況時都來的高,在工程應用上應針對此處加強冷卻效力;當冰水管位置固定,加熱器功率增大對剖面溫度分布影響不大;當冰水流量從4 LPM增加到15 LPM,平均溫度差形成一拋物曲線,先降後升,且高流量時入口處溫度出現不規則的跳動;另外,當加熱器水平高度越低,剖面整體溫度越均勻。 在多支冰水管的實驗中,大致上冰水管越多冷卻效率越佳,因為冰水吸熱表面積增大較增加冰水流量來的有效率,因此多支冰水管置於洞道上方,加熱器也置於洞道上方但在冰水管的下方,此時為最佳佈設。 | zh_TW |
dc.description.abstract | Natural convection heat transfer in a circular enclosure has been developed for a long time. One of many applications is cooling system of underground cable tunnels. For Taiwan, We lack for experiences of building underground cable tunnels. We need more literatures to provide a lot of information for structuring underground cable tunnels. In underground cable tunnels, a part of electric energy is dissipated by electrical cable so the cooling-water system is needed. In this research the circular tunnel made of concrete was used to simulate underground cable tunnels. Tube-shaped heater was simulated electrical cables. Five pipes made of stainless structured indirect cooling water system. The purpose of this research is to optimize cooling efficiency.
The effect of the position of cooling water pipes(A,B,C,D,E), the angle of the heat source(30°,60°,90°,120°), the power of the heat source(1300, 975, and 650 W), the flow rate of the cooling water(4, 8, 12, and 15LPM), the number of the cooling water pipes were discussed. T-type Thermocouples installed on cross section of downstream section of underground cable tunnel to measure air temperature. In the experiment of single pipe of cooling water, the smallest distance between single pipe of cooling water and heater was the highest efficiency but local relative high temperature was higher than any other case. When the position of single pipe of cooling water is fixed, the power of heater didn’t influence the distribution of temperature of air significantly. The average Temperature profile was like a parabolic line when the flow rate of cooling water increased from 4 LPM to 15 LPM and strong fluctuations of temperature of air occurred on the section of entrance of the tunnel as the flow rate of cooling water more than 12 LPM. The level of heat source was lower then the temperature of air was more uniform. In the experiment of number of pipes of cooling water, the result shows that more pipes of cooling water were activity then the temperature of cross section of the tunnel is lower due to increase the total area of cooling water pipes. The best layout is that Multi-pipes are arranged on the top of the tunnel and heater is the same but below the pipes. | en |
dc.description.provenance | Made available in DSpace on 2021-06-08T04:21:42Z (GMT). No. of bitstreams: 1 ntu-99-R97522114-1.pdf: 6613055 bytes, checksum: c117d29cc5d2e94d3aaa7f5e7c70cf41 (MD5) Previous issue date: 2010 | en |
dc.description.tableofcontents | 口試委員會審定書 i
誌謝 iii 摘要 v Abstract vii 目錄 ix 表目錄 xii 圖目錄 xiii 符號說明 xxi 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 5 2.1 單一管狀熱源之自然對流研究 5 2.2 封閉空間中含線性熱源之自然對流研究 7 2.3 洞道內冷卻系統之熱傳研究 12 第三章 實驗設備與方法 17 3.1 洞道主體 17 3.2 加熱設備 17 3.3 冷水循環系統 18 3.3.1 冰水主機與冰水循環泵 18 3.3.2 恆溫蓄水槽與補水裝置 19 3.3.3 系統循環泵 19 3.3.4 入出口分流管與旁通(bypass) 19 3.3.5 不鏽鋼水管 19 3.4 量測系統 20 3.4.1 溫度量測元件 20 3.4.2 電力量測元件 21 3.4.3 流量與壓力量測元件 21 3.5 實驗操作變因 22 3.6 實驗流程 22 3.7 數據分析 23 第四章 結果與討論 27 4.1 單支冰水管不同位置對剖面溫度的影響 27 4.2 加熱器不同位置對剖面溫度的影響 31 4.3 改變加熱器功率對剖面溫度的影響 33 4.4 改變冰水流量對剖面溫度的影響 33 4.5 固定流量改變冰水管數量對剖面溫度的影響 35 4.6 兩支冰水管對剖面溫度的影響 36 4.7 四支冰水管對剖面溫度的影響 37 4.8 洞道剖面的無因次溫度 38 4.9 洞道壁面熱傳的探討 38 第五章 結論與建議 39 5.1 結論 39 5.2 建議 40 參考文獻 41 附表 48 附圖 61 附錄A 誤差分析 121 附錄B 熱電偶線溫度校正 124 附錄C 浮子式流量計校正 141 附錄D 財團法人台灣電子檢驗中心校正報告 145 | |
dc.language.iso | zh-TW | |
dc.title | 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 | zh_TW |
dc.title | Experimental Study on Natural Convection Heat Transfer of Indirect Water Cooling System with Single Linear Heat Source in a Circular Tunnel | en |
dc.type | Thesis | |
dc.date.schoolyear | 98-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 謝曉星,李昭仁,黃智勇 | |
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 | 147 | |
dc.rights.note | 未授權 | |
dc.date.accepted | 2010-07-08 | |
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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