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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 周賢福(Shyan-Fu Chou) | |
| dc.contributor.author | Kun-Cheng Tsai | en |
| dc.contributor.author | 蔡坤城 | zh_TW |
| dc.date.accessioned | 2021-06-13T03:39:44Z | - |
| dc.date.available | 2010-07-28 | |
| dc.date.copyright | 2006-07-28 | |
| dc.date.issued | 2006 | |
| dc.date.submitted | 2006-07-25 | |
| dc.identifier.citation | 1. 1. Parker, R. O., and Treybal, R. E., 1961, “The Heat, Mass Transfer Characteristics of Evaporative Coolers,” AIChE Chemical Engineering Progress Symposium Series, Vol. 57, No. 32, pp. 138-149.
2. Mizushina, T., Ito, R., and Miyashita, H., 1967, “Experimental Study of an Evaporative Coolers,” International Chemical Engineering, Vol. 7, No. 4, pp.727-732. 3. Niitsu, Y., Natio, K., and Anzai, T., 1969, “Studies on Characteristics and Design Procedure of Evaporative Coolers,” Journal of SHASE, Japan, Vol. 43, No. 7. 4. Finlay, I. C., and Grant, W. D., 1972, “The Accuracy of Some Simple Methods of Rating Evaporative Coolers,” Report No. 584, National Engineering Laboratory, East Killbride, Glasgow. 5. Grissom, W. M., and Wierum, F. A., 1981, “Liquid Spray Cooling of a Heated Surface,” Int. J. Heat Mass Transfer, Vol. 24, pp. 261-271. 6. Perterson, D., Glasser, D., Williams, D., and Ramsden, R., 1988, “Predicting the Performance of an Evaporative Condenser,” Journal of Heat Transfer, Vol. 110, pp. 748-753. 7. Koschenz, M., 1995, “Model for Closed Circuit Evaporative Cooling Tower, ” Proceedings of 4th International Conference of IBPSA International Building Performance Simulation Association, Madison, WI, USA. 8. Graham, K. M., and Ramadhyani, S., 1996, “Experimental and Theoretical Studies of Mist Jet Impingement Cooling,” Journal of Heat Transfer, Vol. 118, pp. 343-349. 9. Ortiz, Lester, and Gonzalez, Jorge E., 1999, “Experiments on Steady-State High Heat Fluxes Using Spray Cooling,” Experimental Heat Transfer, Vol. 12, pp. 215-233. 10. Ettouney, H. M., El-Dessouky, H. T., Bouhamra, W., and Al-Azmi, B., 2001, “Performance of Evaporative Condensers,” Heat Transfer Engineering, Vol. 22, pp. 41-55. 11. Hasan, A., Siren, K., 2002, “Theoretical and Computational Analysis of Closed Wet Cooling Towers and Its Applications in Cooling of Building,” Energy and Buildings, Vol. 34, No. 5, pp. 477-486. 12. Hasan, A., Gan, G., 2002, “Simplification of Analytical Models and Incorporation with CFD for the Performance Prediction of Closed Wet Cooling Towers,” International Journal of Energy Research, Vol. 26, No. 13, pp. 1161-1174. 13. Hasan, A., Siren, K., 2003, “Performance Investigation of Plain and Finned Tube Evaporatively Cooled Heat Exchangers,” Applied Thermal Engineering, Vol. 23, pp. 325-340. 14. Schmidt, Th.E., 1949, “Heat Transfer Calculations for Extended Surfaces,” Refrigerating Engineering, pp. 351-357. 15. Zhukauskas, A., 1972, “Heat Transfer from Tubes in Cross Flow,” In Advances in Heat Transfer, ed. J. P. Hartnett and T. F. Irvine, Jr. Vol. 8. New York:Academic Press. 16. Cengel, A., 1988, Heat Transfer, McGraw Hill, N.Y.. 17. 王啟川， 2001， 熱交換器設計(I) ，五南圖書出版股份有限公司。 | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/32266 | - |
| dc.description.abstract | 隨著各地平均氣溫逐漸升高，在冷凍空調系統的使用頻率也提高，如何有效提升整個系統的熱傳效率為大家所重視。在此將噴霧裝置應用於複合式熱交換器上，結合了噴霧顆粒發生相變化蒸發冷卻以及部分的熱交換管因噴霧所產生液膜而有水冷作用，再加上風扇的強制對流散熱作用，希望因而有效提升整個熱交換器的熱傳效率。本研究探討各種不同操作條件下，如噴霧液體溫度、熱水熱源溫度、熱交換器型式以及是否噴霧等，找出最佳化設計並且整理出可應用之噴霧熱傳係數的經驗公式。研究結果可知，當噴霧液體直接接觸熱交換器溫度最高之處可以有最好的熱傳效率。經由本研究測試不同熱交換器可證實，具較小熱交換面積的裸管區域較有大熱交換面積的鳍片區具有較高之總熱傳係數，可見噴霧蒸發的效果在裸管區發揮相當大的作用。而使用噴霧裝置後，在不同熱交換器下其總熱傳量增加了8%至33%之間的量。 | zh_TW |
| dc.description.abstract | Heat transfer efficiency has being an emergency issue with the increase of average temperature and refrigeration/ air conditioning usage. The original thoughts of applying Co-axial Spray Devices on Composite Heat Exchanger is to combine the phase change evaporation cooling and the water film cooling effects generated from spray. Furthermore, it will greatly improve the heat transfer efficiency of the heat exchanger with the forced convection heat radiate function of fan.
The study is conducted under different operational conditions, such as spray water temperature, heat source temperature, types of heat exchanger and spray availability, trying to find out the best and most feasible heat transfer coefficient formula. According to the research conducted by different heat exchangers, it’s been proved that the plain tubes with smaller heat transfer area presents higher heat transfer coefficient than plain-finned tubes with larger heat transfer area, which shows that spray evaporation will function greatly in plain tube area. After the application of Co-axial Spray Devices, the total heat transfer volume between different heat exchanger has an 8% to 33% increase. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T03:39:44Z (GMT). No. of bitstreams: 1 ntu-95-R93522302-1.pdf: 791517 bytes, checksum: e2ff6f026eb16d990be60865e1645a30 (MD5) Previous issue date: 2006 | en |
| dc.description.tableofcontents | 目 錄
第一章 導論 1.1 前言……................................................................................1 1.2 文獻回顧................................................................................2 1.3 研究目的................................................................................6 第二章 理論基礎 2.1 系統之假設............................................................................8 2.2 噴霧散熱之總熱傳係數..................................................8 2.2.1 裸管管區.......................................................................8 2.2.2 鰭片管區......................................................................10 2.3 沒有使用噴霧裝置散熱之總熱傳係數…………………...13 2.3.1 裸管管區.......................................................................13 2.3.2 鰭片管區.......................................................................14 第三章 實驗設備與步驟 3.1 實驗設備..............................................................................16 3.2 實驗步驟..............................................................................19 第四章 結果與討論 4.1 總熱傳量Q之實驗結果討論.............................................22 4.1.1 複合式熱交換器A.......................................................22 4.1.2 複合式熱交換器B......................................................23 4.1.3 複合式熱交換器C…………………..........................24 4.1.4 複合式熱交換器D......................................................25 4.1.5 四種複合式熱交換器之比較......................................26 4.2 熱傳係數U之討論............................................................28 4.2.1 複合式熱交換器A......................................................28 4.2.2 複合式熱交換器B......................................................28 4.2.3 複合式熱交換器C…………………..........................29 4.2.4 複合式熱交換器D......................................................30 4.2.5 四種複合式熱交換器之比較......................................31 4.3 熱阻值R之討論................................................................32 4.3.1 複合式熱交換器A......................................................32 4.3.2 複合式熱交換器B......................................................33 4.3.3 複合式熱交換器C…………………..........................33 4.3.4 複合式熱交換器D......................................................34 4.3.5 四種複合式熱交換器之比較......................................34 4.4 熱傳係數 之討論..............................................................36 4.4.1 複合式熱交換器A......................................................36 4.4.2 複合式熱交換器B......................................................38 4.4.3 複合式熱交換器C…………………..........................38 4.4.4 複合式熱交換器D......................................................40 4.4.5 四種複合式熱交換器之比較......................................41 4.5 誤差討論.............................................................................42 4.5.1 公式應用在 上之誤差...............................................43 4.6 最佳化設計……………………………………………….46 第五章 結論與建議 5.1 結論......................................................................................48 5.2 建議與未來發展..................................................................52 參考文獻..................................................................................................54 附圖..........................................................................................................56 附表.........................................................................................................109 | |
| dc.language.iso | zh-TW | |
| dc.title | 同軸噴霧裝置應用於複合式熱交換器之熱傳分析 | zh_TW |
| dc.title | The Heat Transfer Analysis of Composite Heat Exchanger using Co-axial Spray Devices | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 94-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 陳瑤明,林恒毅 | |
| dc.subject.keyword | 熱交換器,噴霧,熱傳分析, | zh_TW |
| dc.subject.keyword | heat exchanger,spray,Heat Transfer Analysis, | en |
| dc.relation.page | 114 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2006-07-26 | |
| 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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