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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 顏瑞和 | |
| dc.contributor.author | Ting-Yau Shiu | en |
| dc.contributor.author | 許庭耀 | zh_TW |
| dc.date.accessioned | 2021-06-15T06:14:51Z | - |
| dc.date.available | 2011-08-16 | |
| dc.date.copyright | 2010-08-16 | |
| dc.date.issued | 2010 | |
| dc.date.submitted | 2010-08-11 | |
| dc.identifier.citation | [1] E. H. ASHRAE, 'Stream jet refrigeration equipment,' ASHARE, US, pp. 13.1-13.6, 1979.
[2] K. Pianthong, et al., 'Investigation and improvement of ejector refrigeration system using computational fluid dynamics technique,' Energy Conversion and Management, vol. 48, pp. 2556-2564, 2007. [3] X. Ma, et al., 'Experimental investigation of a novel steam ejector refrigerator suitable for solar energy applications,' Applied Thermal Engineering, vol. 30, pp. 1320-1325, 2010. [4] E. P. N. J.H Keenan, 'A simple air ejector,' J. Appl. Mech. Trans. ASME, vol. 64, pp. A75-A81, 1942. [5] N. E. Keenan JH, 'An investigation of ejector design by analysis and experiment,' J Appl Mech, Trans ASME, vol. 72, pp. 299-309, 1950. [6] B. J. Huang, et al., 'A 1-D analysis of ejector performanceAnalyse unidimensionnelle de la performance d'un éjecteur,' International Journal of Refrigeration, vol. 22, pp. 354-364, 1999. [7] Y. Zhu, et al., 'Shock circle model for ejector performance evaluation,' Energy Conversion and Management, vol. 48, pp. 2533-2541, 2007. [8] S. Varga, et al., 'Numerical assessment of steam ejector efficiencies using CFD,' International Journal of Refrigeration, vol. 32, pp. 1203-1211, 2009. [9] P. Desevaux, 'A method for visualizing the mixing zone between two co-axial flows in an ejector,' Optics and Lasers in Engineering, vol. 35, pp. 317-323, 2001. [10] P. Desevaux, et al., 'Visualization of Secondary Flow Choking Phenomena in a Supersonic Air Ejector,' Journal of Visualization, vol. 7, pp. 249-256, 2004. [11] Y. Bartosiewicz, et al., 'Numerical and experimental investigations on supersonic ejectors,' International Journal of Heat and Fluid Flow, vol. 26, pp. 56-70, 2005. [12] T. Sriveerakul, et al., 'Performance prediction of steam ejector using computational fluid dynamics: Part 1. Validation of the CFD results,' International Journal of Thermal Sciences, vol. 46, pp. 812-822, 2007. [13] X.-D. Wang and J.-L. Dong, 'Numerical study on the performances of steam-jet vacuum pump at different operating conditions,' Vacuum, vol. 84, pp. 1341-1346, 2010. [14] M. Ji, et al., 'CFD investigation on the flow structure inside thermo vapor compressor,' Energy, vol. 35, pp. 2694-2702, 2010. [15] K. Chunnanond and S. Aphornratana, 'An experimental investigation of a steam ejector refrigerator: the analysis of the pressure profile along the ejector,' Applied Thermal Engineering, vol. 24, pp. 311-322, 2004. [16] T. Sriveerakul, et al., 'Performance prediction of steam ejector using computational fluid dynamics: Part 2. Flow structure of a steam ejector influenced by operating pressures and geometries,' International Journal of Thermal Sciences, vol. 46, pp. 823-833, 2007. [17] E. Rusly, et al., 'CFD analysis of ejector in a combined ejector cooling system,' International Journal of Refrigeration, vol. 28, pp. 1092-1101, 2005. [18] S. B. Riffat and S. A. Omer, 'CFD modelling and experimental investigation of an ejector refrigeration system using methanol as the working fluid,' International Journal of Energy Research, vol. 25, pp. 115-128, 2001. [19] I. W. Eames, et al., 'Results of an experimental study of an advanced jet-pump refrigerator operating with R245fa,' Applied Thermal Engineering, vol. 27, pp. 2833-2840, 2007. [20] S. Aphornratana and I. W. Eames, 'A small capacity steam-ejector refrigerator: experimental investigation of a system using ejector with movable primary nozzle,' International Journal of Refrigeration, vol. 20, pp. 352-358, 1997. [21] Y. Zhu, et al., 'Numerical investigation of geometry parameters for design of high performance ejectors,' Applied Thermal Engineering, vol. 29, pp. 898-905, 2009. [22] 張俊民, '噴射式冷氣系統之研究,' 台大機械系博士論文, 1998. [23] S. Varga, et al., 'Influence of geometrical factors on steam ejector performance - A numerical assessment,' International Journal of Refrigeration, vol. 32, pp. 1694-1701, 2009. [24] A. Selvaraju and A. Mani, 'Experimental investigation on R134a vapour ejector refrigeration system,' International Journal of Refrigeration, vol. 29, pp. 1160-1166, 2006. [25] R. YapIcI, et al., 'Experimental determination of the optimum performance of ejector refrigeration system depending on ejector area ratio,' International Journal of Refrigeration, vol. 31, pp. 1183-1189, 2008. [26] 吳佳鴻, '噴射式太陽能輔助熱泵製冷供熱系統研究,' 台大機械系博士論文, 2010. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/47724 | - |
| dc.description.abstract | 太陽能噴射式製冷系統的操作溫度會隨太陽能輻射熱與環境溫度變化，使用傳統固定式噴嘴噴射器無法使性能達到最佳化。本研究設計一支可調式噴嘴噴射器，藉由調整針的位置改變主噴嘴喉部面積。如此一來，調整針的位置即可使噴射器適應操作溫度的變化。對於特定的A3/At來說，當操作溫度改變時藉由調整主噴嘴喉部面積使冷凝器溫度等於臨界溫度，可以使噴射器達到最佳性能。本研究以回歸分析計算出可調式噴嘴噴射器的最佳A3/At與操作溫度的關係式. A3/At=0.71701Tg-0.0196Te+0.70234Tc+0.00204TgTe-0.01185TgTc-0.00257TeTc-43.9477。以實際操作觀點來看，如果實驗量測到產生器溫度、蒸發器溫度、冷凝器溫度時，使用此關係式可調式噴嘴噴射器即可調整到最佳的A3/At，系統即可操作在最佳性能。 | zh_TW |
| dc.description.abstract | For solar-driven ejector refrigeration system, operating temperature may change with the variation in solar radiation and ambient temperature. Thus, a conventional fixed throat area ejector may not work at its optimal performance. In this study, a variable ejector has been designed, which incorporates a needle into the ejector. This allows the primary throat area to be changed by adjusting the position of the needle. By means of this controlled needle modification, an unsteady operating temperature can be taken into account. For a given throat area, an optimum generator temperature exists at which the critical condenser temperature is the same as the actual condenser temperature. A regressive equation, related to the corresponding optimum throat area ratio with respect to the operating conditions, is obtained. A3/At=0.71701Tg-0.0196Te+0.70234Tc+ 0.00204TgTe-0.01185TgTc-0.00257TeTc-43.9477. From the practical operating point of view, if the generator, evaporator or condenser temperature is measured out, the ejector can be adjusted to the corresponding optimal throat area ratio using the equation. The system then operates with optimal performance. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-15T06:14:51Z (GMT). No. of bitstreams: 1 ntu-99-R97522116-1.pdf: 2090957 bytes, checksum: 8ec8bd7dc2ebce468b57fa12b521f220 (MD5) Previous issue date: 2010 | en |
| dc.description.tableofcontents | 誌謝 i
中文摘要 ii 英文摘要 iii 目錄 iv 圖目錄 vii 表目錄 x 符號說明 xii 第 一 章 緒論 1 1.1 研究動機 1 1.2 文獻回顧 2 1.2.1 噴射式製冷技術 3 1.2.2 操作溫度與幾何形狀對噴射器性能的影響 7 1.2.3 可調式噴嘴噴射器 9 1.3 研究目的與內容 10 第 二 章 理論與數值方法 17 2.1 一維分析模式 17 2.2 數值模擬簡介 20 2.3 統御方程式 20 2.4 數值求解方法 22 2.5 紊流模式與壁面函數 23 2.6 鬆弛因子 25 第 三 章 實例測試與驗證 29 3.1 流場設定與紊流模式 29 3.2 網格獨立測試 30 3.3 實驗驗證 31 第 四 章 噴射器的流場分析 37 4.1 主噴嘴喉部面積對主噴流發展的影響 37 4.2 產生器溫度對主噴流發展的影響 39 4.3 蒸發器溫度對主噴流發展的影響 41 4.4 主噴嘴出口面積對主噴流發展的影響 43 4.5 設計可調式噴嘴噴射器 45 4.6 結論 47 第 五 章 噴射器的最佳操作性能分析 59 5.1 比較固定式噴嘴噴射器與可調式噴嘴噴射器的性能 59 5.1.1 產生器溫度對噴射器性能的影響 59 5.1.2 蒸發器溫度對噴射器性能的影響 61 5.1.3 冷凝器溫度對噴射器性能的影響 62 5.2 可調式噴嘴噴射器的最佳性能 63 第 六 章 結論與建議 73 6.1 結論 73 6.2 建議與未來展望 74 參考文獻 77 | |
| dc.language.iso | zh-TW | |
| dc.title | 可調式噴嘴噴射器最佳操作性能的設計與分析 | zh_TW |
| dc.title | Optimal Performance Design For A Variable Throat Ejector | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 98-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 黃秉鈞,楊馥菱 | |
| dc.subject.keyword | 可調式噴嘴噴射器,太陽能噴射式製冷系統,數值模擬, | zh_TW |
| dc.subject.keyword | Variable throat ejector,Solar-driven ejector refrigeration system,Numerical simulation, | en |
| dc.relation.page | 79 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2010-08-12 | |
| 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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