半弧/圓形無蕊式太陽能熱管集熱器之研製

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姓名

陳德堂(De-Tang Chen) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

半弧/圓形無蕊式太陽能熱管集熱器之研製
(Investigation of Semi-arc/circular wicklsee heat pipe of solar collector)

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摘要(中)

本實驗共測試四根半弧/圓形無蕊式熱管，分別為填充甲醇佔蒸發段容積20、35、50及65%，其蒸發段為半弧形，液體夾於兩邊，夾角的表面張力使蒸發段壁面保持潤濕，提高其有效熱傳導係數，液汽流動介面小，降低了傾斜角度對熱阻的影響。而圓形冷凝段具較大蒸汽空間與凝結面積，相對的凝結液膜變薄，使冷凝段等效熱傳導係數增加，提升整體性能。四根熱管的總長度皆為1380mm，分別為蒸發段1000mm、絕熱段80mm及冷凝段300mm。熱傳機制、填充量和傾斜角的影響皆已量得並討論。
填充率65%、50%與35%在低加熱功率下皆有啟動困難的情形發生，唯20%在低加熱功率下即可啟動，且整體性能良好，將此半弧/圓形熱管應用於太陽能熱水器上能有效解決晨昏日射量低啟動不易以及架設角度低等缺失；水槽內採自然對流循環方式，熱阻較熱管部份高出許多，未來應改善水槽水與熱管冷凝段間熱傳，可考慮將熱管插入於水槽底端以增進整體熱傳能力。

摘要(英)

This paper presents an experimental analysis of the heat transfer performance of a semi-arc/circular wickless heat pipe. Methanol was filled as the working fluid with 20%, 35%, 50% and 65% filling ratios of the evaporating section volume. Owing to the action of surface tension drainage in the sharp corner, it keeps the evaporating of the heat pipe wet and cause the higher evaporating thermal conductivity than that of circular tube. It also can reduce the effect of thermal conductivity. Evaporating and condensing space of circular condensing section was larger hence the condensing liquid film become thinner and improved the performance. The total length of all heat pipe are 1380mm. For evaporating section is 1000mm、adiabatic section is 80mm and condensing section is 300mm. The heat transfer mechanism and effect of filling ratio and inclination angle were measured and discussed.
The situation of start up difficult was occurred at filling ratio 65%, 50% and 35%. However it’s startable at 20% for low power support with good performance. The disadvantages of start up difficult at low insolation and low incline angle for solar water heater would be improve by semi-arc/circular wickless heat pipe. Natural convection heat transfer was found in water tank section and caused the higher heat resistance compared to heat pipe section. The heat resistance of water tank section was higher than heat pipe section, since the heat transfer was natural convection.
Future work is necessary to improve the heat transfer performance of water tank section. It’s believed that the performance will be improved by inserting the heat pipe into bottom of water tank.

關鍵字(中)

★ 熱管
★ 太陽能熱水器
★ 無蕊式
★ 半弧/圓形熱管
★ 表面張力

關鍵字(英)

★ solar water heater
★ wickless
★ semi-arc/circular heat pipe
★ surface tension

論文目次

摘要…………………………………………………………………... i
目錄…………………………………………………………………... ii
表目錄……………………………………………………………….. iv
圖目錄………………………………………………………………... v
符號說明……………………………………………………………. ix
第一章　前言……………………………………………………..… 1
1.1 研究動機與背景…………………………….…………... 1
1.2 研究目的………………………………………………… 4
第二章　文獻回顧………………………………………………….. 10
2.1熱管作用原理與熱傳特性……………………………… 10
2.1.1熱管的類型…………………………………….…… 10
2.1.2無蕊材熱管驅動力……………………………………. 11
2.1.3熱管的啟動…………………………………….…… 12
2.1.4無蕊式熱管熱傳特性與極限類型.………….…………12
2.1.5 熱傳性能與極限變因……….…………………….. 15
2.2熱管於太陽能集熱器的應用與其分類.…………………… 16
2.2.1 太陽能集熱器的基本組成….……….…………………16
2.2.2 熱管於太陽能集熱器的應用….……….………………17
第三章　實驗系統及分析方法……………………………………... 26
3.1簡介………………………………………………..………. 26
3.2實驗系統…….…………………………………………….. 27
3.2.1 測試段….…………………………………………….. 27
3.2.2 測試系統…………………………………………….... 28
3.2.3 量測儀器設備………………………………………... 28
3.3 實驗過程………………………………………………...... 30
3.4 實驗數據分析…………………………………………….. 31
第四章　實驗結果與討論………..……………………..….……48
4.1 熱傳機制…………………………………………..………. 48
4.1.1填充率65%………………………….………….……. 48
4.1.2填充率20%………………………….………….……. 50
4.2 傾斜角的影響…………………………………………...……51
4.2.1填充率65%………………………….………….……. 51
4.2.2填充率20%………………………….………….……. 52
4.3填充率的影響…………………………………………...……52
4.4不同角度下有效熱傳導係數熱與加熱功率之關係………..54
4.5模擬台灣平均逐時日射量………………………...………..54
第五章　結論與建議……………………………………………..…. 95
參考文獻……………………………………………………………. 97
附錄………………………………………………………………..…. 100

參考文獻

Akyurt, M., 1984, “Development of Heat Pipes for Solar Water Heater,” Solar Energy, Vol.32, pp. 625-631. Quoted in 孫即愚等 [1994].
Azad, E., Bahar, F., and Moztarzadeh, F. 1987, “Solar Water Heater Using Gravity-Assisted Heat pipe,” Heat Recovery Systems, Vol.7, No.4, pp. 343-350.
Bairamov, R., and Toiliev, K. 1981, “Heat Pipes in Solar Collectors,” Proceedings of the 4th International Heat Pipe Conference, Advances in Heat Pipe Technology, Pergamon Press, New York, pp. 47-54.
Bienert, W. B., and Wolf, D. A., 1976, “Heat Pipes in Flat Solar Collectors,” ASME paper 76-WA/SOL-12, pp. 11. Quoted in 孫即愚等 [1994].
Chun, W., Kang, Y. K., Kwak, H. Y., Lee, Y. S., 1999, “An experimental study of heat pipes for solar water heaters,” Applied Thermal Engineering, Vol. 19, pp. 807-817.
Dunn, P. D., and Reay, D. A., 1994, Heat Pipes, 4th education, Pergamon Press, New York.
El-Nasr, M. A., and El-Haggar, S. M., 1993, “Performance of a Wickless
Heat Pipe Solar Collector,” Energy Sources, Vol. 15, pp. 513-522.
Faghri, A., 1995, Heat Pipe Science and Technology, Taylor ＆ Francis Publishing Company, Washington, D. C.
Hahne, E., and Gross, U., 1982, "The influence of the inclination angle on the performance of a closed two-phase thermosyphon," Proceedings of the 4th International Heat Pipe Conference, Advances in Heat Pipe Technology, Pergamon Press, New York, pp. 125 – 136.
Ismail, K. A. R., and Adogderah, M. M., 1998, “Performance of a Heat Pipe Solar Collector,” Journal of Solar Energy Engineering, Vol. 120, pp.51-59.
Joudi, Khalid. A., and Witwit, A. M., 2000, "Improvements of gravity assisted wickless heat pipes," Energy Conversion and management, Vol. 41, pp. 2041-2061.
Kline, S. J., 1985, “The Purposes of Uncertainty Analysis,” Transactions of the ASME Journal of Heat Transfer, Vol. 107, pp. 153-160.
Maezawa, S., 2000, “HEAT PIPE : Its Origin, Development and Present Situation,” Proceedings of the 6th International Heat Pipe Symposium, Chiang Mai, Thailand, pp.3-13.
Mathioulakis, E., and Vassilis, B., 2002, “A New Heat-Pipe Type Solar Domestic Hot Water System,” Solar Energy, Vol. 72, No. 1, pp. 13-20.
Moffat, R. J., 1985, “Using Uncertainty Analysis in The Planning of An Experiment,” Transactions of the ASME Journal of Heat Transfer, Vol. 107, pp. 173-178.
Negishi, K., and Sawada, T., 1983, "Heat transfer performance of an inclined two-phase closed thermosyphon," International Journal Heat and Mass Transfer," Vol. 26, No. 8, pp. 1207 - 1213.
Ng, K. C., Yap, C., and Khor, T. K., 2000, "Outdoor testing of ezacuated-tube heat-pipe solar collectors," The Institution of Mechanical Engineers, Vol. 214, Part. 1, pp.23 - 30.
Nguyen-Chi, H., and Groll, M., 1982, "Entrainment or flooding limit in a closed two-phase thermosyphon," Proceedings of the 4th International Heat Pipe Conference, Advances in Heat Pipe Technology, Pergamon Press, New York, pp. 147 - 162.
Peterson, G. P., 1994, An Introduction to Heat Pipes : Modeling, Testing, And Applications, John Wiley & Sons, Inc.
Ribot, J., and McConnell, R. D., 1983, "Testing and Analysis of a Heat-Pipe Solar Collector," Solar Energy Research Institute, Vol. 105, pp.440 - 445.
Yang, C. Y., and Yeh, C. T., 2001, “Heat Transfer Performance of a Semi-Arc Wickless Heat Pipe,” Proceedings of the 36th Intersociety Energyt Conversion Engineering Conference, pp. 1-7.
太陽能熱水系統甲類技術人員講習班講義，1988，經濟部能源委員會編印。
孫即愚等，1994，熱管節能產品研究開發計畫八十三年度期末報告，經濟部能源委員會編印。
黃文雄，1978，太陽能之應用及理論，協志工業，台北市。
葉竣達，2001，半弧形無蕊式熱管熱傳性能實驗，中央大學機械系碩士論文。

指導教授

楊建裕(Chien-Yuh Yang)

審核日期

2003-7-18

推文