作　　者： ; ;

机构地区： 清华大学建筑学院建筑技术科学系

出　　处： 《工程热物理学报》 2004年第3期451-453,共3页

摘　　要： 本文建立了平板建材有机挥发性化合物(VOCs)单面散发模型,并给出了其分析解。与文献中现有模型不同,该模型没有假设材料内部初始浓度均匀。模型经实验验证。藉模型和数值分析,弄清了VOCs初始浓度分布对散发特性的影响:对于材料厚度相对小,扩散系数相对大的长期散发过程,可以忽略初始浓度对散发的影响。 A new and generally applicable model for calculating the surface emissions of VOCs (volatile organic compounds) from single-layered, dry building materials and the VOC instantaneous distributions in the materials is developed. Different from the mass transfer based models in the literature, the new model does not neglect the mass transfer resistance through the air phase boundary layer and does not assume that the initial VOC concentration distribution (C_0) in the building materials is uniform. And this paper provides an analytical solution for this model. By using different distribution of initial VOC concentration in building materials, the influence of initial VOC concentration on VOC emission characteristics is clarified: For the long-term emission prediction cases that the material thickness is relatively small and the diffusion coefficient is relatively large, it would be justified to neglect the effect of initial VOC concentration distribution on emission characteristics. The model would be useful to estimate the emission characteristics of building materials.

关 键 词： 传质模型 散发 初始浓度 有机挥发性化合物 建筑材料 室内空气质量

领　　域： [动力工程及工程热物理] [动力工程及工程热物理]