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| 研究生： |
周晉成 Chou, Chin-Cheng |
|---|---|
| 論文名稱： |
儲水桶對太陽能板空氣動力效應分析 Study of aerodynamic effects of water tank installed on solar water heater |
| 指導教授： |
張克勤
Chang, Keh-Chin 鍾光民 Chung, Kung-Ming |
| 學位類別： |
碩士 Master |
| 系所名稱： |
工學院 - 航空太空工程學系 Department of Aeronautics & Astronautics |
| 論文出版年： | 2009 |
| 畢業學年度： | 97 |
| 語文別： | 中文 |
| 論文頁數： | 80 |
| 中文關鍵詞： | 阻力 、升力 、導流板 、太陽能熱水系統 |
| 外文關鍵詞： | Solar water heater, blockage effect, uplift force, guide plate |
| 相關次數： | 點閱：78 下載：4 |
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中文摘要
論文題目:儲水桶對太陽能熱水器空氣動力之效應分析研究
研究生:周晉成
指導教授:張克勤、鍾光民
目前台灣積極推動再生能源開發與應用，減少對進口能源的依賴。現今使用最普遍為太陽能熱水系統，在政府補助民眾安裝太陽能熱水系統的政策下，安裝系統件數逐年增加。而系統絕大多數安裝在建築物頂樓，但是台灣所處地理位置每年必會遭受颱風侵襲，為使系統達到最佳熱效率，因此在強風吹襲下，集熱板可能無法負荷強大風力或系統結構本身設計不良而造成損壞，如何提升系統抗風阻能力，為本研究之目標。
本研究使用市售縮小尺寸之太陽能熱水系統為基本模型(僅有集熱板)，改變集熱板之傾斜角度與此外亦安裝不同截面積之導流板降低模型之升阻力。利用水柱式壓力儀量測集熱板上、下板面之壓力分佈，並使用荷重元與兩軸測力平衡儀量測模型所受升、阻力，由量測結果分析模型所受之空氣動力效應為何，並做進一步探討。
實驗結果指出，隨著集熱板傾斜角度增加，
改變集熱板前端尾流強度，模型所受升、阻力隨之增加。在模型後方安裝導流板可遮蔽氣流，避免氣流直接衝擊下板面，降低板面縱軸前端壓力差與橫軸側向渦流效應，其三維升力有效降低，但亦增加阻力。與安裝水桶模型比較，氣流通過水桶，減弱上板面尾流強度，降低集熱板前端壓力差與尾流影響範圍，三維升力顯示降低模型總體升力。在尺寸效應方面，由40%模型與60%模型比較，後者阻塞比過高(如集熱板傾斜角達25o、30O)，影響實驗結果，造成量測得升、阻力數據不準確。
關鍵字：太陽能熱水系統、導流板、升力、阻力
ABSTRACT
A Study of Aerodynamic effects of Water tank installed on Solar Water Heater
Student: Chin-Cheng Chou
Advisor: Keh-Chin Chang、Kung-Ming Chung
The Renewable Development Energy Bill was activated recently in Taiwan. This is the milestone in the development and application of renewable energy, in which solar energy is one of the major resources. During the past two decades, solar water heaters have been proved to be reliable and economical in cases of hot water production in Taiwan. However, tens of typhoons may occur over the western North Pacific and South China Sea each year, and some affect Taiwan. The safety of solar water heaters under severe wind load during typhoon season is thus a critical issue in promotion of solar water heaters in Taiwan. Previous studies on solar water heaters have mainly focused on the thermal efficiency of various types of solar collectors, and there has been limited work done on the aerodynamic characteristics of solar collectors or their supporting structure. In this study, an experimental program was conducted to examine the aerodynamic characteristics of a solar collector model (a tilt flat panel) with or without a guide plate. With a guide plate, less wind load and increasing uniformity of spanwise pressure distributions are associated with larger projected area of a guide plate on the lower surface of a tilt flat panel. This is essentially attributed to the attenuation of corner vortices. From the measurements by load cells and x-y force sensors, the uplift force increases with tile angle and decreases with increasing projected area of a guide plate. In comparison with a tilt flat panel with a horizontal cylinder, the data show the presence of a horizontal cylinder tends to reduce the suction force on the lower surface within the first half of the tilt flat panel. Stronger positive longitudinal differential pressure is observed for the test case of a tilt flat panel only, which corresponds to strong wind load. Further, the blockage effect is significant for both test models at higher tilt angles.
Keywords : Solar water heater, guide plate , uplift force , blockage effect
文獻回顧
[1]張克勤、李聰盛、鍾光民、連雅鳳,”國內太陽能熱水器推廣及使用情形頗析”太陽能及新能源學刊, 第11卷, 第一、二期, pp.9-11.(2006)
[2]張克勤、李聰盛、鍾光民、連雅鳳,”台灣推廣使用太陽能熱水器對節能和減碳之成效探討.” 環保資訊, 第125期.(2008)
[3]太陽能熱水系統推廣獎勵作業承辦機構，”太陽能熱水系統受颱風損壞情形探討.”(2005)
[4]蕭葆羲, 風工程, 科技圖書, 台灣, (2005)
[5]Peter A. Irwin.,”Bluff body aerodynamics in wind engineering,” Journal of Wind
Engineering and Industrial Aerodynamics, Vol.96, pp.701-712.(2008)
[6]劉怡眉, 林怡君 , 張克勤, 鐘光民,”低風阻太陽能熱水器之設計測試”中 國航太學會 (2005)
[7]陳俊谷, ”降低太陽能熱水風損之實驗研究”國立成功大學航空太空研究所 碩士論文 (2006)
[8]修治平, ”導流板對不同角度集熱板之空氣動力特性研究”國立成功大學航 空太空研究所碩士論文 (2006)
[9]鄧一, 陳宇杰 ,“提升太陽能熱水器抗風能力之最佳化設計法”,暑期大專 生專題研究報告(2008)
校內：立即公開校外：2009-08-24公開