a novel method for measuring the diffusion, partition and convective mass transfer coefficients of formaldehyde and voc in building materials一个新颖的方法测量扩散,传质系数分区和建筑材料中的甲醛和挥发性有机化合物.pdfVIP

A Novel Method for Measuring the Diffusion, Partition and Convective Mass Transfer Coefficients of Formaldehyde and VOC in Building Materials 1 2 2 Jianyin Xiong *, Shaodan Huang , Yinping Zhang 1 School of Mechanical Engineering, Beijing Institute of Technology, Beijing, China, 2 Department of Building Science, Tsinghua University, Beijing, China Abstract The diffusion coefficient (Dm) and material/air partition coefficient (K) are two key parameters characterizing the formaldehyde and volatile organic compounds (VOC) sorption behavior in building materials. By virtue of the sorption process in airtight chamber, this paper proposes a novel method to measure the two key parameters, as well as the convective mass transfer coefficient (hm). Compared to traditional methods, it has the following merits: (1) the K, Dm and hm can be simultaneously obtained, thus is convenient to use; (2) it is time-saving, just one sorption process in airtight chamber is required; (3) the determination of hm is based on the formaldehyde and VOC concentration data in the test chamber rather than the generally used empirical correlations obtained from the heat and mass transfer analogy, thus is more accurate and can be regarded as a significant improvement. The present method is applied to measure the three parameters by treating the experimental data in the literature, and good results are obtained, which validates the effectiveness of the method. Our new method also provides a potential pathway for measuring hm of semi-volatile organic compounds (SVOC) by using that of VOC. Citation: Xiong J, Huang S, Zhang Y (2012) A Novel Method for Measuring the Diffusion, Partition