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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received January 2, 2008
Accepted December 15, 2008

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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A multi-phase model for VOC emission from single-layer dry building materials

Baoqing Deng^{1 2} Ru Li¹ Chang Nyung Kim^{2 3†}

¹College of Urban Construction & Environmental Engineering, University of Shanghai for Science & Technology, Shanghai, 200093, P. R. China ²College of Advanced Technology, Kyung Hee University, Yongin 449-701, Korea ³Industrial Liaison Research Institute, Kyung Hee University, Yongin 449-701, Korea

cnkim@khu.ac.kr

Korean Journal of Chemical Engineering, July 2009, 26(4), 919-924(6), 10.1007/s11814-009-0154-2

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Abstract

A multi-phase model for the emission of VOC from dry building materials is developed. Dry building materials are viewed as porous media. A general adsorption isotherm is used to construct the concentration equation in the porous media. The boundary conditions at the material-air interface are presented for both CFD model and one compartment model. With the use of Henry’s law for the adsorption isotherm, an analytical solution is obtained and further is validated with the comparison of the experiment performed by Yang et al. [1], yielding a relatively good agreement. The effects of the model parameters on the emission are investigated in detail. Increasing the effective diffusion coefficient and the partition coefficient tends to promote the emission and increase the peak value of the concentration in the air. The effect of the porosity depends on the degree of the dependence of the effective diffusion coefficient on the porosity. When a weak dependence exists, the increase of the porosity tends to suppress the emission_x000D_ and decrease the peak value of the concentration in the air. However, when a strong dependence exists, the increase of the porosity tends to promote the emission and increase the peak value of the concentration in the air.

Keywords

VOC Emission Multi-phase Model Porosity Adsorption Isotherm

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