一种干建材有机挥发物散发的多相模型研究

Study on Multiphase Model for Emission of VOC from Dry Building Materials

本文建立了干建材VOC散发的多相模型，并针对VOC以气相和材料相的形态存在于建材中的特点进行理论分析，得到了模型的解析解。本文还根据建立的浓度控制方程，研究了模型参数对小室浓度的影响，研究结果表明：有效扩散系数和分离系数对干建材VOC的散发影响明显，空气中VOC浓度峰值（或浓度）随着这2个参数的增大而增大。有效扩散系数与孔隙率的不同相关关系影响VOC的散发：当存在弱相关关系时，增大孔隙率能够抑制VOC的散发；当存在强相关关系时，减小孔隙率能够抑制VOC的散发，当改变建材的孔隙率来提高建材中VOC的散发时，必须正确确定两者的关系。

This paper constructs a multiphase model for emission of VOC from dry building materials, gives a theoretical analysis to the characteristics of VOC present in building materials in the forms of gas phase, and obtains the analytic solution of this model. The paper also studies the impact of model parameters on chamber concentration based on the established concentration control equations, and the study results show that： Effective diffusion coefficient and separation coefficient have a significant impact on the emission of VOC from dry buildings materials, and the peak concentration of VOC in the air （or concentration） increases with the increase of these two parameters. Different correlation between effective diffusion coefficient and porosity affects VOC emission： When the correlation is weak, increased porosity can inhibit VOC emission; when the correlation is strong, decreased porosity can inhibit VOC emission; when porosity of building materials is changed to improve emission of VOC from building materials, the correct relationship between the two must be correctly determined.