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Student Number 983203061
Author Chia-wen Kao(高嘉文)
Author's Email Address No Public.
Statistics This thesis had been viewed 623 times. Download 936 times.
Department Mechanical Engineering
Year 2010
Semester 1
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Experimental Investigation of Heat Storage for Phase-Change-Material in a Spherical Container
Date of Defense 2011-01-04
Page Count 109
Keyword
  • capsule
  • latent heat
  • phase change material
  • thermal resistance
  • thermal storage tank
  • Abstract This study analyzes one-dimensional spherical phase change material
    (PCM) heat transfer formula which derives from the concept of thermal
    resistance. The viability of this formula is validated by experimental data.
    In the analysis of thermal resistance, the heat which absorb by PCM is
    assumed equal to the heat which transfer from the heat transfer fluid
    (HTF). In the system, there are three types of thermal resistance in series
    connection, including HTF to capsule outside surface, capsule outside
    surface to inside surface, and capsule inside surface to PCM. Due to the
    specific heat of capsule is very small, the sensible heat of capsule is
    neglected. The heat transfer within liquid PCM is considered as two
    different types – only conduction and only convection.
    As the results, the parameters which affect the melting time include
    size and thickness of capsule, and thermal physical properties of capsule,
    PCM, and HTF. By the parameter analysis, the melting time is reduced as
    the Nusselt number of HTF is increasing, and the thermal conductivity of
    capsule is enhanced.
    To predict the melting time, it has good agreement by using the heat
    transfer formula with considering convection. To predict the melting
    surface location, when the melting location coefficient is larger than 0.37,
    using the heat transfer formula without considering convection has good
    agreement. But when the melting location coefficient is smaller than 0.37,
    using the heat transfer formula with considering convection has good
    agreement.
    Table of Content 中文摘要…………………………………………………………….……i
    英文摘要…………………………………………………………………ii
    誌謝……………………………………………………………………iii
    目錄……………………………………………………………………iv
    表目錄………………………………………………………………vii
    圖目錄…………………………………………………………………viii
    第一章、研究背景與目的………………………………………………..1
    1-1 前言………………………………..……………….3
    1-2 研究動機………………………………..……………….3
    1-3 低溫相變化儲熱系統之文獻回顧………..……………3
    1-3-1 儲能介紹……………...……..…….………….………5
    1-3-2 相變化儲能材料挑選…...…….……………….……..6
    第二章、文獻回顧………………………………….…………………….9
    2-1 相關文獻彙整…..………………..………………….........9
    2-1-1 儲存囊內部分析相關文獻............................................9
    2-1-2 實驗驗證與系統架設相關文獻…………………......12
    2-2 研究主題...........................................................................13
    第三章、研究方法…………….……………….………………………..16
    3-1 球形熱阻分析問題..………………………………….16
    3-1-1 液態相變化材料只考慮熱傳導公式推導……….17
    3-1-2 液態相變化材料考慮熱對流公式推導………….19
    3-2 ㄧ維相變化熱傳方程式可靠度實驗…………….…...24
    3-2-1 實驗器材簡介……………………………………...24
    3-2-2 靜置加熱下,玻璃球之融化實驗與過程觀察….….26
    3-2-3 靜置加熱下,金屬球囊之融化………………………27
    3-3 添加鰭片增加傳熱實驗……….……………...………28
    3-4 大型儲熱槽系統之建立……………………….………28
    3-5 時間偵測與溫度趨勢………………………………….31
    3-5-1 溫度偵測點位置與融化時間之影響與關係………31
    第四章、結果與討論………………………………………………… 34
    4-1 ㄧ維相變化熱傳分析…………………………………34
    4-1-1
    Ksph比上Kliq對於融化時間的影響……….…………………34
    4-1-2 water Nu 對於融化時間的影響……….………..............37
    4-2 改變添加鰭片之數量縮短總融化時間..……………40
    4-3 建立大型低溫儲熱槽實作……………………………42
    4-3-1 幾何模型………………………………………...……42
    4-3-2 金屬球擺放位置對總融化時間之影響……..………42
    4-3-2-1 緊貼擺放之熱傳分析……………………………42
    4-3-2-2 平均擺放之熱傳分析……………………………. 43
    第五章、結論……………………………………………..……………..45
    5-1 公式推導結論…………………………………………45
    5-2 實驗研究結論…………………………………………46
    第六章、未來工作………………………………………………………47
    參考文獻………………………………...……………………...............48
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    Advisor
  • Chung-jen Tseng(曾重仁)
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    Date of Submission 2011-01-28

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