English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 80990/80990 (100%)
造訪人次 : 41633918      線上人數 : 3518
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋


    請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/61391


    題名: Thermal Properties and Structural Characterizations of New Types of Phase Change Material: Anhydrous and Hydrated Palmitic Acid/Camphene Solid Dispersions
    作者: 邱鈺琇;Chiu,Yu-Hsiu
    貢獻者: 化學工程與材料工程學系
    關鍵詞: 相轉移材料;棕櫚酸;莰烯;固體分散體;溫度-軌跡法;phase change materials;palmitic acid;camphene;solid dispersions;temperature-history method
    日期: 2013-08-01
    上傳時間: 2013-10-08 15:07:10 (UTC+8)
    出版者: 國立中央大學
    摘要: 本研究的目的是找到擁有在固體或液體狀態熱容量增加的相轉移材料混和物。在固相或液相,熱容量的增加可以提高儲熱的部分,可在更寬的溫度範圍內使用,而不是只在熔點或凝固點附近吸收或釋放熱能。我們使用低溫差示掃描量熱法(LT-DSC)測定熔點和平衡狀態,粉末X射線衍射(PXRD)和小角X射線散射(SAXS)測定樣品的奈米結構,溫度軌跡方法測定熱性能。棕櫚酸為一種高級脂肪酸,而莰烯為一種塑晶(Plastic crystal)。1:1莫耳比的棕櫚酸/莰烯混合物形成PA1CA1。通過使用溫度軌跡方法,無水PA1CA1的熱性能是:熔點 = 322.7+0.0 (K),液態熱含量 = 2.04+0.04 (kJ kg-1 K-1),固態熱含量 = 2.17+0.06 (kJ kg-1 K-1),潛熱 = 114.0+1.2(kJ kg-1) 和固態導熱性 = 0.21+0.00 (W m-1 K-1)和含水PA1CA1的熱性能是:熔點 = 324.8+0.2 (K),液態熱含量 = 2.29+0.04 (kJ kg-1 K-1),固態熱含量 = 2.61+0.01(kJ kg-1 K-1),潛熱 =119.6+1.8 (kJ kg-1),固態導熱性 = 0.21+0.01(W m-1 K-1)。總體而言,含水PA1CA1優於無水PA1CA1,因為含水PA1CA1比無水PA1CA1有較高的固態和液態熱容量增加。部分非晶相的形成(更加無序狀態),有助於提高固態無水或含水PA1CA1的熱容量。在此研究中的棕櫚酸和莰烯混合物並不是共晶混和物,而是222到431奈米尺寸的棕櫚酸顆粒分散在非晶型莰烯基質中以形成固態分散體(Solid dispersions)。我們的系統可以用在生物氣候建築/結構的被動儲存系統和應用在離峰時段的冷卻和加熱。
    Our aim is to find phase change material (PCM) mixtures which also have an increase in the heat capacity in solid or liquid state. Increasing heat capacity in liquid or solid state would enhance the part of heat storage which can be used in a wider temperature range, rather than just to absorb or release heat energy near the melting point or freezing point. We use low-temperature differential scanning calorimetry (LT-DSC) to determine the melting point and the equilibrium state, powder X-ray diffraction (PXRD) and small-angle X-ray scattering (SAXS) to determine the nano structures, temperature-history method to find the thermal properties in large-scale. 1: 1 molar ratios of palmitic acid/camphene mixture (PA1CA1) By using temperature-history method, thermal properties of anhydrous PA1CA1 are: Tm = 322.7+0.0 K, cpl = 2.04+0.04 kJ kg-1 K-1, cps = 2.17+0.06 kJ kg-1 K-1, ΔHls = 114.0+1.2 kJ kg-1, and ks = 0.21+0.00 W m-1 K-1 and the thermal properties of hydrated PA1CA1 are: Tm = 324.8+0.2 K, cpl = 2.29+0.04 kJ kg-1 K-1, cps = 2.61+0.01 kJ kg-1 K-1, ΔHls = 119.6+1.8 kJ kg-1, and ks = 0.21+0.01 W m-1 K-1. Overall, hydrated PA1CA1 is better than anhydrous PA1CA1 with increasing in both heat capacity in solid and liquid state. Partial amorphous phase formation (more disordered state) helps increase the heat capacity in solid state of anhydrous or hydrated PA1CA1. The mixture of palmitic acid and camphene in this research is not a eutectic mixture but rather palmitic acid particles nanometer-sized 222 nm ~431 nm are dispersed in partial amorphous camphene matrix to form a solid dispersion. Our systems can be used in passive storage in bio-climatic building/architecture and application in off-peak electricity for cooling and heating.
    顯示於類別:[化學工程與材料工程研究所] 博碩士論文

    文件中的檔案:

    檔案 描述 大小格式瀏覽次數
    index.html0KbHTML798檢視/開啟


    在NCUIR中所有的資料項目都受到原著作權保護.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 隱私權政策聲明