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研究生： 林尚賢
Lin, Shang-Hsien
論文名稱： 多孔性吸脫附反應器熱管理效能之實驗分析
Experimental Performance Analysis of Thermal Management for Porous Adsorption/Desorption Reactors
指導教授： 楊天祥
Yang, Tian-Shiang
共同指導教授: 陳國聲
Chen, Kuo-Shen
學位類別： 碩士
Master
系所名稱： 工學院 - 機械工程學系
Department of Mechanical Engineering
論文出版年： 2014
畢業學年度： 102
語文別： 英文
論文頁數： 83
中文關鍵詞： 多孔性反應器 、吸/脫附反應器 、增強熱傳 、實驗分析 、金屬氫化物 、矽膠 、軸心式熱交換器 、散熱鰭片 、熱質傳遞
外文關鍵詞： porous reactor, adsorption/desorption reaction, thermal enhancement, experimental analysis, metal hydride, silica gel, axial heat exchanger, longitudinal fin, heat and mass transfer
相關次數： 點閱：144  下載：2 
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    • 近年由於石油匱乏，以致積極尋找替代能源永續發展已成當務之急，氫氣為重要潔淨能源選項之一，於運輸應用領域又以金屬氫化物儲存方法最具潛力。在本實驗室先前的研究工作中，我們曾針對金屬氫化物吸/釋氫過程伴隨發生熱質傳遞的理論以及數值模擬作一系列探討，並分析其所對應可逆吸/放熱反應的現象，以期找出最佳熱管理策略提高儲氫系統的效能。考量實驗操作安全以及系統簡化，先前學長的研究工作已建立矽膠系統來模擬金屬氫化物系統，以探討其吸脫附反應伴隨發生的熱質傳遞現象，並延伸研究的範疇至多孔性系統的吸脫附反應分析。本論文將延續其核心架構，主要研究多孔性吸脫附反應器裝置熱傳增益機構對於效能上的改善，實驗結果指出多孔性系統的吸附效率在反應器裝有八片散熱鰭片的軸心式散熱管並通有較高流量冷卻液的情形將提升18.75%的效能，此外當流入反應器的空氣濕度提高，或是在空氣和冷卻液流量較大的情況其吸附的效率也較佳；脫附反應則在空氣溫度較高和流量較大的參數設定之下，其系統的效率較佳。因此，本論文研究工作除了改善矽膠吸脫附效率，同時更有效提升多孔性系統的運作效能。

    On account of the threatening depletion of crude oil, it is imperative to find an alternative energy for sustainable development, and metal hydride system appears to be the most promising one to fossil fuels among all current options because of its high calorific value and environmentally friendly characteristics. A series of theoretical and numerical works were done in our group to analyze the heat and mass transfer phenomena happening in the reactor. Furthermore, the adsorption/desorption process is a reversible endothermic/exothermic reaction, so heat transfer properties of hydrogen storage system would affect the efficiency directly and must therefore be carefully managed. Due to simplicity and safety concerns, and for fundamental understanding of the underlying thermofluid mechanisms, experiments of this thesis are carried out by silica gel instead of metal hydrides. Furthermore, silica gel is a porous medium in essence, hence the present work is devoted to experimental performance analysis of thermal management for porous reactors, especially in analyzing the effects on adsorption/desorption efficiency of heat transfer enhancement mechanism such as axial heat exchanger with longitudinal fins. The major results are briefly presented: the adsorption efficiency has an 18.75% improvement by equipping an axial heat exchanger with 8 longitudinal fins on the reactor, and the system is able to adsorb more water in the cases of higher humidity, larger flow rates of air and coolant. On the other hand, the efficiency in dehumidification is improved by heating the air to higher temperature and letting more air access to the reactor. To conclude, the contribution of this work is not only in easing energy crisis, but also applying to improvement of technologies in various aspects.

    摘要 I Abstract II 誌謝 IV Contents VI List of Tables IX List of Figures X Nomenclature XIV Chapter 1: Introduction 1 1.1 Background 1 1.2 Literature Review 5 1.2.1 Hydrogen storage research 5 1.2.2 Silica gel research 9 1.2.3 Similarity between silica gel and metal hydride system 11 1.3 Purpose of the Research 14 1.4 Outline of this Thesis 15 Chapter 2: Methodology 16 2.1 Experiment Design 16 2.1.1 Adsorption/Desorption reactor 18 2.1.2 Axial heat exchanger 22 2.1.3 Heating device 24 2.1.4 Surge tank 25 2.1.5 Air humidifier 27 2.2 Apparatus 29 2.2.1 Data logger 29 2.2.2 Pressure transmitter 30 2.2.3 Hygrometer 32 2.2.4 Air dryer 32 2.2.5 Flowmeters 33 2.3 Material 34 2.4 Data Collection Procedure 35 Chapter 3: Results and Discussion 41 3.1 Typical Results 41 3.2 Effects on Water Accumulated of Humidity in various Flow Rate 46 3.2.1 Phenomenon of adsorption in the silica gel system 46 3.2.2 Analysis of temperature variation in adsorption reactor 48 3.3 Effects on Water Accumulated of Axial Heat Exchanger 51 3.3.1 Adsorption capability in various numbers of fins and flow rates of coolant 51 3.3.2 Adsorption phenomenon in different longitudinal positions 55 3.3.3 Adsorption phenomenon in different radial positions 57 3.4 Effects on Dehumidification of Air Temperature and Flow Rate 61 3.4.1 Typical results 61 3.4.2 Desorption ability in different temperature and flow rate 66 3.4.3 Analysis of temperature variation in desorption reactor 68 Chapter 4: Conclusions 71 4.1 Summary of the Study 71 4.2 Limitations and Recommendations for Future Task 74 References 75

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