太阳能固体吸附材料等效导热系数的分形模型  

Fractal model of equivalent thermal conductivity of the solar energy solid adsorption materials

作　　者：杨晚生[1] 石海娟[1] 王璋元[1] 赵旭东[1] 

机构地区：[1]广东工业大学土木与交通工程学院,广东广州510006

出　　处：《新型建筑材料》2014年第6期64-68,共5页New Building Materials

基　　金：广东省科技计划国际合作项目(2011B050400032);住房和城乡建设部科技项目(2011-k1-28);广州市番禺区科技计划项目(2011-Z-01-37)

摘　　要：新型太阳能固体吸附材料是一种典型的多孔介质,它内部不规则的孔隙结构对导热过程有很大影响。采用分形几何理论建立了描述其内部孔隙结构特征的平行孔道模型和弯曲孔道模型,通过计算孔道弯曲度分形维数,推导出计算该固体吸附材料等效导热系数的分形模型,计算得到其在不同含湿状态下的等效导热系数,并将其与实验测试结果进行了对比分析。结果表明,平行孔道模型比弯曲孔道模型更接近于固体吸附材料的实际孔隙结构;在含湿率大于55%时,固体吸附材料等效导热系数的分形模型计算值与实验值基本一致,误差小于9.60%;在含湿率小于55%时,模型计算值与实验测试值存在较大误差,需对等效导热系数分形模型进行修正,修正后的等效导热系数分形模型计算值与实验测试值相对误差小于4.0%,具有较好的一致性。Solar solid adsorption material is a typical porous media,its irregular internal pore structure has a great influence on the thermal conductivity process. In this paper, fractal geometric theory of the establishment of a description of its internal pore structure characteristics of the parallel channel model and curved channel model,by calculating the pore curvature points fractal dimension,calculate the solid adsorbent material equivalent thermal conductivity of the fractal model is derived,calculated to get in different moisture status of the equivalent thermal conductivity of the solid adsorbent material, and the experimental results were compared and analyzed. According to the comparative analysis of the results, it is found that the parallel channel model is closer to the actual pore structure of the solid adsorbent material than the curved channel model. And moisture content greater than 55%,it is basically the same between the calculated values of the fractal model and experimental values of the equivalent thermal conductivity of solid adsorption material,the error is less than 9.6%;moisture content less than 55%,the model calculated values and experimental test values exist large errors,the need to amend the fractal model of equivalent thermal conductivity, the relative error is less than 4.0% between the amended fractal model calculated and measured test values of the equivalent thermal conduc- tivity. Therefore,they have good consistency.

关 键 词：固体吸附材料 等效导热系数 分形模型 平行孔道模型 弯曲孔道模型 

分 类 号：TU111.41[建筑科学—建筑理论]