金属相变储热材料铝硅合金储热特性研究  

Research of thermal storage characteristics of Al-Si alloy as PCM

作　　者：陈观生[1] 王波群[1] 张仁元[1] 李风[1] 张莉[1] 麦志豪[1] 

机构地区：[1]广东工业大学材料与能源学院,广东广州510006

出　　处：《材料研究与应用》2010年第4期255-259,共5页Materials Research and Application

基　　金：国家高技术研究发展计划项目(2007AA05Z460)

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.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,start-melting 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.

关 键 词：铝硅合金 太阳能 高温 相变 储热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]