臺灣博碩士論文加值系統

能源對於經濟發展來說是重要的原動力，現代科技的進步與經濟發展的規模，都取決在如何來使用能源；然而地球暖化問題越來越嚴重，所開發的資源（如石油、天然氣及煤炭…等）不斷地被人們耗盡，開發再生能源則是當前最受重視的課題，而再生能源其中以太陽能應用最為可行。
本研究進行使用再生能源之太陽能熱水系統之模擬研究，利用CFD來對3維的模型進行數值模擬儲熱槽之熱流場，與結合TRNSYS軟體模擬整體系統運作，探討在儲熱槽內加裝隔板及隔板數量以及用戶取用負荷時間為：tL1(中午十二點至下午六點）、tL2(中午十二點至晚上十二點）以及tL3（二十四小時）。本研究以台灣北中南三個代表城市，即台北、台中及高雄，為探討對象。
模擬研究結果發現取負荷時間以tL1取負荷時間太陽能月負荷比及太陽能年負荷比為最佳，其次為tL2取負荷時間，最差為tL3取負荷時間，隨著隔板數的增加，能夠有效的提升太陽能負荷比，隔板確實可以使儲熱槽內部達到分層效果，提高集熱器效率，減少輔助能源的使用，進而提升太陽能熱水系統性能。

In order to reduce global warming, the development of renewable energy sources is imperative. One of the most viable solar energy utility is the solar hot water system.
In this study, a three-dimensional CFD program is employed to simulate the field in the storage tank of a large solar hot water system. The storage tank simulation is coupled with a system simulation program, TRNSYS, to simulate the entire solar hot water system. The parameters for the storage tank including the number of stratification baffles in the tank and the location of hot water outlet are studied. Also, the effects of the load supplying time on the system performance are studied including tL1 (12:00 to 18:00), tL2 (12:00 to 00:00) and tL3 (24hr). The study was done for three representative cities in Taiwan, i.e. Taipei、Taichung and Kaohsiung.
The results indicate that the case with load time tL1 provides the best solar fraction. The more the number of baffles in the storage tank, the better the thermal stratification and therefore the better the system performance can be achieved. The results of the present study can provide system design references.

目錄.........................................................................................II
圖目錄.....................................................................................IV
表目錄.....................................................................................XI
摘要........................................................................................XII
ABSTRACT.............................................................................XIII
符號說明................................................................................XIV
第一章 緒論..............................................................................1
1-1 前言.................................................................................1
1-2 太陽能熱水系統.................................................................2
1-3 文獻回顧...........................................................................3
1-4 研究動機與目標.................................................................5
第二章 儲熱槽之設計參數與數學模式.........................................11
2-1 研究目的與方法................................................................11
2-2 系統模型..........................................................................11
2-3 儲熱槽之基本假設.............................................................12
2-4 儲熱槽之統御方程式（Governing Equation） .......................12
2-5 邊界計算之條件................................................................13
2-6 TRNSYS系統設計條件.......................................................14
2-7 軟體之運算方法.................................................................14
第三章 數值方法.......................................................................22
3-1 網格測試...........................................................................22
3-2 SIMPLEC 數值方法............................................................22
3-3 太陽能之負荷比（Solar Fraction）.......................................23
3-4 TMY2氣象資料（台灣平均氣象年資料）...............................24
第四章 結果與討論....................................................................27
4-1 儲熱槽取負荷時間與隔板數量..............................................27
4-2 取負荷時間tL1與隔板數量之比較..........................................27
4-3 取負荷時間tL2與隔板數量之比較..........................................28
4-4 取負荷時間tL3與隔板數量之比較..........................................29
4-5 台北地區取負荷時間與隔板數量對太陽能月負荷比之影響.......30
4-6 太陽能年負荷比.................................................................31
4-7 使用TRNSYS儲熱槽模組與CFD模擬儲熱槽之比較................32
第五章 結論與未來展望.............................................................90
5-1 結論.................................................................................90
5-2 未來展望..........................................................................92

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