| Phase change materials have several interesting properties as energy storage material, such as stable temperature, large heat fusion, stable properties. The reserves of phase change materials are abundance and the energy of the world are lack, so the research of phase change materials are important.In this work, materials' structure and thermal properties have been characterized by chemical analysis, small angle X-ray diffraction, differential scanning calorimetry, scanning electron microscope and high-resolution transmission electron microscope.The performance of organic and inorganic phase change materials have been studied. The complex system of (80%Na2SO4·10H2O + 20%Na2HPO4·12H2O) has been tried to obtain better results. The results indicated that its melting point was 28-29℃. The phenomena of solid phase settled out and super cooling were eliminated. The complex system of (capric acid : lauric acid is 2:3) has been tested and the phase change temperature is 28-29℃. The complex system of (80%NPG+ 20% TMP) has been tested and the melting point is 23℃ and the freezing point is 27 ℃.Bentonite was modified by CTAB, and the hydrophilicity of bentonite was weakened. The distance between layers change from 1.21nm to 4.09nm. Using liquid inserting method, NPG and TMP have been inserted to the bentonite's layers and have been tested that the phase change point is 51.3℃ and the heat fusion is 125.9J/g. Capric acid and lauric acid have been inserted to bentonite layers using melting inserting method, and have been tested that the phase change temperature is 26℃ and the heat fusion is 72.48J/g.Capric acid, lauric acid/bentonite was inserted to plasterboard directly. The composite plasterboard was tested that the thermal conductivity is 0.63 w/m·k and the temperature conductivity is 5.64×10-4 m2/h and the specific heat is 2.89 kJ/kg·k. |
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