Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2392
DC FieldValueLanguage
dc.contributor陳石法zh_TW
dc.contributor黃榮祥zh_TW
dc.contributor方輝爐zh_TW
dc.contributor.advisor沈君洋zh_TW
dc.contributor.author陳世豪zh_TW
dc.contributor.authorChen, Shih-Haoen_US
dc.contributor.other中興大學zh_TW
dc.date2010zh_TW
dc.date.accessioned2014-06-05T11:43:13Z-
dc.date.available2014-06-05T11:43:13Z-
dc.identifierU0005-3107200921202600zh_TW
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dc.identifier.urihttp://hdl.handle.net/11455/2392-
dc.description.abstract本研究進行一個螺旋式熱交換器之模擬分析,並測試一個此熱交換器實驗模型之熱傳性能,分析模式採一維之熱傳模式,管內流體考慮為混合之狀態,其流動方向為螺旋型式,而管外流體為不混合之狀態,其流動方向為由熱交換器之徑向均勻向外流出。研究中利用電腦模擬分析計算管內流體出口之無因次溫度,將其代入公式後,即可獲得熱交換器之熱效率與第二定律效率。分析之結果顯示,於一個固定之熱傳單位數(Ntu)下,當兩流體之整體熱容率比值(Ct*)等於1時,其熱效率為最低;而Ct*愈趨近於零或無窮大時,其熱效率愈趨近於最高值。相反地,當Ct*值於1附近時,且Ntu值為固定時,其第二定律效率為最大。除此之外,將兩相同之螺旋熱交換器經逆向串聯後,其熱效率與第二定律效率值均會明顯優於單一熱交換器之性能。實驗量測乃針對一個具五圈螺旋管之熱交換器模型進行氣體側(管外)熱對流係數(h)與摩擦因子(f)之量測,所考慮雷諾數(Re)之範圍為353~2593,所得之數據並加以迴歸分析,結果顯示,f值與(Re-300)之-0.393次方成正比,而Nu值則會與[(Re/1000)+8]之3.169次方成正比。zh_TW
dc.description.abstractThe heat transfer performance of a spiral heat exchanger was numerically and experimentally investigated. In the analysis, a one-dimensional heat transfer model was used. The tube flow is mixed and it flows spirally from the inlet to the outlet. The flow outside the tube is unmixed and it flows radially from the centerline of the spiral tube toward outside. The non-dimensional temperature of the tube flow was evaluated and it yielded the effectiveness and second-law efficiency of the heat exchanger. For a fixed Ntu value, as the ratio of flow heat capacity rates (Ct*) is 1.0, the effectiveness is at the minimum. As the Ct* approaches zero or infinity, the effectiveness would approach the maximum. Conversely, for a fixed Ntu value, as the Ct* value nears 1.0, the second-law efficiency is at the maximum. The effectiveness and second-law efficiency of two heat exchangers in overall-counterflow arrangement appears to be much higher to those of a single heat exchanger. In the experiment, the gas-side (outside the tube) convective heat transfer coefficient (h) and Darcy friction factor (f) of a test model with a five-lap spiral tube was measured. The Reynolds number was in the range 353-2593, The result shows that the f value increases with the (Re-300)^(-0.393).The Nu value increases with the (Re/1000+8)^(3.169).en_US
dc.description.tableofcontents摘 要...........................................................................................i ABSTRACT................................................................................ii 致謝..........................................................................................iii 目錄..........................................................................................iv 表目錄......................................................................................vii 圖目錄.....................................................................................viii 符號說明...................................................................................xi 第一章 緒論................................................................................1 1-1 前言.....................................................................................1 1-2 相關研究..............................................................................2 1-3 研究目的..............................................................................8 第二章 熱效率之理論分析模式....................................................10 2-1 管道外側流體之能量平衡......................................................10 2-2 管道外側流體於X方向之平均溫度...........................................13 2-3 管道內側流體之能量平衡......................................................14 2-4 無因次化之統御方程式.........................................................18 2-5 熱效率................................................................................20 2-6 兩個熱效率值相同之熱交換器經逆向串聯後之熱效率...............22 第三章 第二定律效率之理論分析模式...........................................24 3-1 熱交換量流體之壓降與EXERGY之傳輸...................................24 3-2 管道外側流體之有效可逆功 ( EXERGY ).................................25 3-3 管道內側流體之有效可逆功 ( EXERGY ).................................26 3-4 無因次化.............................................................................27 3-5 第二定律效率 ( SECOND-LAW EFFICIENCY )........................29 3-6 兩個熱效率值相同之熱交換器經逆向串聯後之第二定律效率......31 第四章 模擬分析之結果...............................................................33 4-1 熱效率分析之結果................................................................33 4-2 第二定律效率分析之結果.......................................................35 4-3 逆向串聯熱交換器組之第二定律效率分析之結果......................37 第五章 實驗量測與實驗結果........................................................39 5-1 實驗說明.............................................................................39 5-2 氣體體積流率與壓力降之量測................................................40 5-3 氣體體積流率與溫度之量測...................................................41 5-4 實驗結果.............................................................................41 5-4-1 氣體測之雷諾數與摩擦因子之相關性....................................41 5-4-2 氣體測之雷諾數與熱對流係數之相關性................................44 第六章 結論...............................................................................46 參考文獻...................................................................................48zh_TW
dc.language.isoen_USzh_TW
dc.publisher機械工程學系所zh_TW
dc.relation.urihttp://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-3107200921202600en_US
dc.subjectspiral heat exchangeren_US
dc.subject螺旋式熱交換器zh_TW
dc.subjecteffectivenessen_US
dc.subjectsecond-law efficiencyen_US
dc.subjectReynolds numberen_US
dc.subject熱效率zh_TW
dc.subject第二定律效率zh_TW
dc.subject雷諾數zh_TW
dc.title一個螺旋狀熱交換器之熱傳性能zh_TW
dc.titleHeat Transfer Performance of a Spiral Heat Exchangeren_US
dc.typeThesis and Dissertationzh_TW
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