【作者】 陈观生； 王波群； 张仁元； 李风； 张莉； 麦志豪；

【Author】 CHEN Guan-sheng,WANG Bo-qun,ZHANG Ren-yuan,LI Feng,ZHANG Li,MAI Zhi-hao (Faculty of Material & Energy,Guangdong University of Technology,Guangzhou Higher Education Mega-center 510006,China)

【机构】 广东工业大学材料与能源学院；

【摘要】 在不同热循环次数下,对含硅质量分数分别为13%,17%和21%的铝硅合金的热物理性能的变化进行了研究,并对基于铝硅合金(13%Si)的太阳能高温热利用系统中储热体的储、放热过程进行了数值模拟.结果表明:随热循环次数的增加,Al-Si合金的熔化潜热、熔化温度、热导率及线膨胀系数等热物性虽然均有不同程度的变化,但所变化的幅度均较小,说明铝硅合金的热物性较为稳定,衰减较慢;储热体在储、放热过程中温度变化平稳,所需集热温度不超过980K,供热温度可达600K以上.更多还原

【Abstract】 Al-Si alloys with different silicon content(wt%)including 13%,17%and 21%were studied at different thermal cycles of 400,800 and 1200 and the variation of thermal physical properties was analyzed. Then a numerical simulation of thermal storage unit was undertaken including heat charging and discharging process,which uses Al-13%Si alloy as PCM.The results of test and simulation showed that:with the increasing of number of thermal cycles,the thermal properties including latent heat of melting,startmelting temperature,thermal conductivity and linear expansion coefficient are stable although they change in different extent;the temperature change of thermal storage unit changes slowly during the process of heat charging and discharging;the concentrating temperature in heat absorbing surface is no more than 980K while the medium temperature feeding out is over 600K.更多还原