复合墙体中相变层相对导热系数计算方法

发布时间：2019-02-26 07:31

【摘要】：目前相变材料已初步进入工程应用阶段,由于传热过程受比热、导热系数变化及相变作用的影响,相变材料不能像普通材料一样利用导热系数进行材料比选,其热工设计指标的选择具有一定的困难.为此,提出相对导热系数作为相变材料比选的热物性指标,并给出相应的计算方法用以指导相变墙体的热工设计.在一定环境条件下与定物性材料导热能力相同的导热系数定义为相变应用周期内相变材料的相对导热系数.根据此方法计算得到中国不同地区复合墙体相变层的相对导热系数,通过该参数直观地反映出相变材料层全年的动态传热特性,从而对相变材料在不同地区建筑中的应用效果进行评估.通过将不同相变层的相对导热系数进行对比,得出不同相变材料在建筑中的应用效果差异较大.本文提出的相对导热系数能够为不同环境条件下相变材料的优选进行有效指导.
[Abstract]:At present, the phase change material has entered the engineering application stage initially, because the heat transfer process is affected by the specific heat, the change of the thermal conductivity and the phase change, the phase change material can not use the thermal conductivity as the ordinary material to carry on the material comparison and selection. It is difficult to choose the thermal design index. Therefore, the relative thermal conductivity is proposed as the thermal property index of the phase change material selection, and the corresponding calculation method is given to guide the thermal design of the phase change wall. The thermal conductivity of the phase change material is defined as the relative thermal conductivity of the phase change material in the application period under certain environmental conditions, which is the same as the thermal conductivity of the fixed physical material. According to this method, the relative thermal conductivity of phase change layer of composite wall in different areas of China is calculated. Through this parameter, the dynamic heat transfer characteristics of phase change material layer throughout the year can be intuitively reflected. Thus, the application effect of phase change materials in buildings in different areas is evaluated. By comparing the relative thermal conductivity of different phase change layers, it is concluded that the application effect of different phase change materials in building is quite different. The relative thermal conductivity presented in this paper can effectively guide the optimization of phase change materials under different environmental conditions.
【作者单位】：北京工业大学建筑工程学院;
【基金】：国家自然科学基金重大项目(51590912);国家自然科学基金面上项目(51578013) 广东省亚热带建筑技术公共实验室项目
【分类号】：TU111.4;TU59

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