Total volatile organic compounds (TVOC) are mainly derived from indoor building materials and are one of the main causes of indoor air pollution. This paper presents a research on simulating the TVOC release of building materials in the environmental chamber. In this work, a simple and practical prediction model of exponential decay is established to study the transport and the emission behaviors under the effect of convective mass transfer theory. Based on this theory, the model considers the porous structure of indoor building materials and assumes that concentration of TVOC at the boundary of building material obeys exponential distribution. This paper focuses on two kinds of indoor building materials, interior wall coatings and wood coatings. Numerical simulation and experimental parameters are obtained by environmental chamber method. By modelling the emission of TVOCs, and comparing the present model with the classical model, the validity of the present model can be confirmed. Besides, from the results of the fitting, it can be seen that the new exponential decay predition model has a better agreement with the experimental data, and which can describe the release characteristics and transmissionmechanisms of TVOCs more accurately, and the root mean square error is much less than the classical model.

The double exponential decay model is proposed to simulate the total volatile organic compound emissions of indoor building materials. The simulation results are in better agreement with the experimental data than the classical model, and the release characteristic of volatile organic compounds is more accurately described.

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The purpose of this article is to simulate the TVOC release of building materials in the environment chamber. Based on the theory of mass transfer, a three-exponential decay empirical model is proposed. The validity of the model is verified by experimental data and comparison with the classical model. From the fitting results, the new model is more consistent with the experimental data.