光電化學產氫反應器之熱流特性分析

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姓名

鄭凱云(Kai-yun cheng) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

光電化學產氫反應器之熱流特性分析
(Thermal-Fluid Analysis of Photoelectrochemical Hydrogen Production Reactor)

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摘要(中)

本研究分析光電化學反應器內的熱傳與流場特性，並探討反應器設計對熱流特性與產氫效率的影響。使用ANSYS FLUENT套裝軟體作為數值分析的工具。主要研究的參數有反應器的幾何外型與熱傳機制設計、光電極材料能隙、照光密度與量子效率。模型中並考慮AM 1.5的太陽光照射進入反應器後，與玻璃、水及各壁面的輻射特性交互作用。
研究結果顯示，使用方形反應器於照光密度4000 W/m2、量子效率 30 %的條件下，若僅使用短波能量產氫，對應1.5 eV、2.0 eV、2.5 eV和3.0 eV的光電極之理論產氫量分別為251 L/m2-hr、150 L/m2-hr、73 L/m2-hr及25 L/m2-hr；若加入分光機制，有效地利用長波和短波中因量子效率無法用於產氫的能量，將之利用加熱反應器降低分解電位；在case 3的絕熱材加玻璃反應器設計將可提升產氫量至271 L/m2-hr、161 L/m2-hr、79 L/m2-hr及27 L/m2-hr。而理論產氫效率可由22 %、13 %、6.5 %及2.23 %，於case 3中可提升至24 %、14 %、7 %及2.4 %。

摘要(英)

The design of a photo-electrochemical (PEC) reactor is very important; it affects the energy transportation and the hydrogen production rate. In this study, the thermal and fluid flow characteristics of a PEC reactor are investigated. Using ANSYS FLUENT as a tool, the effects of the reactor design, material properties, energy bandgap of the photo-electrode, incident solar intensity, and the quantum efficiency on the thermal-fluid characteristics and the hydrogen production efficiency of are studied and discussed.
Results show that, for a rectangular glass reactor with 4000 W/m2 incident solar intensity, 30 % quantum efficiency, only the short wavelength energy, the hydrogen production rate is 251 L/m2-hr, 150 L/m2-hr, 73 L/m2-hr and 25 L/m2-hr respectively for 1.5 eV, 2.0 eV, 2.5 eV and 3.0 eV bandgap photoanodes. On the other hand, using the long wavelength energy to heating the reactor and lowering the water dissociation energy, and with the case 3 reactor design, the hydrogen production rate can be increased to 271 L/m2-hr, 161 L/m2-hr, 79 L/m2-hr and 27 L/m2-hr, respectively. The corresponding solar-to-hydrogen efficiencies are increased from 22 %, 13 %, 6.5 %, and 2.23 % to 24 %, 14 %, 7 % and 2.4 %.

關鍵字(中)

★ 反應器設計
★ 數值模擬分析
★ 太陽能產氫
★ 光電化學反應器

關鍵字(英)

★ solar hydrogen production
★ photo-electrochemical method
★ reactor design
★ numerical simulation.

論文目次

摘要 i
Abstract ii
致謝 iv
目錄 v
圖目錄 vii
表目錄 xiv
符號表 xv
第一章序論 1
1.1 前言 1
1.2 文獻回顧 2
1.2.1光電化學產氫原理 2
1.2.2 熱力學分析 9
1.2.3 光反應器 10
1.2.4輻射特性與太陽輻射能量 11
1.3研究動機與內容 14
第二章理論分析 15
2.1 光電化學反應器模型 15
2.2基本假設 17
2.3數學模式 17
2.3.1統御方程式 17
2.3.2 輻射傳輸方程式-離散座標法 19
2.4邊界條件 20
第三章數值方法 23
3.1 SIMPE演算法則 23
3.2數值方法之驗證 26
3.2.1網格數獨立性測試 27
3.2.2立體角數量獨立性測試 28
第四章結果與討論 29
4.1 光電極材料對產氫的影響 29
4.2不同反應器設計之熱傳現象 33
4.3 照光密度對產氫的影響 36
4.4 幾何外型對產氫的影響 37
第五章結論與未來展望 40
參考文獻 84

參考文獻

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指導教授

曾重仁(Chung-jen Tseng)

審核日期

2012-8-20

推文