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《Renewable Energy Resources》 2017-03
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Study on the heat release of phase change thermal storage device formed by elastic rectangular thin wall tubes under external pressure and internal suction

Niu Jianhui;Ma Guoyuan;Tian Haichuan;Xu Shuxue;Hou Xiying;College of Environmental and Energy Engineering, Beijing University of Technology;College of Energy and Environmental Engineering, Hebei University of Architecture;  
In view of low thermal conductivity of phase change materials and its easiness to peel off the heating surface in phase change thermal storage device, these questions caused the heat release power of the heat storage device could not meet the actual project needs well. In this paper, a phase change thermal storage device was designed, using thin wall elastic rectangular tubes under external pressure and internal suction. It can solve the heating surface peeling problem caused by thermal expansion and contraction and at the same time it also can enhance the heating surface compactness of the heat storage device. The test bench to phase change heat storage was built and its exothermic performance was tested under different fluid temperature, different fluid flow rate and different temperature of phase change material. The experimental results were shown as follows: The greater the fluid flow rate outside the rectangular tubes, the greater the heat transfer coefficient and the heat power were and the lower the decline rate of both were. When the heat-releasing process was carried out to 1 h, both of them appeared to fluctuate and then decreased smoothly. Heat transfer coefficient decreased fastly with the decrease of the remainder heat power.When the percentage of remainder heat power was 70% ~80%, there was a turning point for heat transfer coefficient decreasing rate and then it became slower. When the percentage of remainder heat power was 20%, the heat release process was basically over. The difference of heat transfer coefficient under different fluid flow rate and temperature difference, which is the initial temperature of the phase change material and the inlet fluid temperature of the phase change heat storage device, was not different very much.
【Fund】: 河北建筑工程学院基金项目(QN201404)
【CateGory Index】: TK513.5
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【Citations】
Chinese Journal Full-text Database 4 Hits
1 WU Xue-hong;WANG Li-xun;LI Wei-ping;ZHANG Lin;LU Yan-li;School of Energy and Power Engineering,Zhengzhou University of Light Industry;;Investigation of enhanced heat transfer for triple-sleeve thermal energy storage exchangers using phase change materials[J];热科学与技术;2015-02
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1 Niu Jianhui;Ma Guoyuan;Tian Haichuan;Xu Shuxue;Hou Xiying;College of Environmental and Energy Engineering, Beijing University of Technology;College of Energy and Environmental Engineering, Hebei University of Architecture;;Study on the heat release of phase change thermal storage device formed by elastic rectangular thin wall tubes under external pressure and internal suction[J];可再生能源;2017-03
2 CUI Fu;YUAN Yanping;ZHAO Junwen;CAO Xiaoling;SUN Liangliang;School of Mechanical Engineering, Southwest Jiaotong University;School of Materials Science and Engineering, Southwest Jiaotong University;;Influence of Cu content on thermal characteristics of high-temperature phase change material Al-Cu alloy[J];化工学报;2017-01
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