Volatile organic compounds (VOC) are commonly present in indoor air, and their transport behavior is jointly influenced by source-sink interactions and dynamic variations in temperature and humidity. Fabric materials such as curtains, bedding, and carpets, characterized by high porosity and large specific surface area, typically act as VOC sinks and secondary sources in indoor environments, with mass transfer properties highly sensitive to thermal and moisture fluctuations. To accurately assess the regulatory effect of fabrics on indoor VOC levels, this study develops coupled models for heat and moisture transfer and VOC migration within fabrics. By integrating hourly indoor temperature and humidity profiles simulated via DeST-h for five representative climate zones, multiphysics simulations are conducted using COMSOL. This study systematically analyzes the influences of internal heat and moisture gradients within fabrics on the diffusion, adsorption and emission of gaseous pollutants. It also quantitatively assesses the peak-shaving and valley-filling regulation performance of fabrics affected by indoor thermal-humid environment, fabric loading rate, material type and other factors. This study reveals the dynamic source-sink effect of VOCs emitted by fabrics in actual built environments, providing a theoretical basis for accurate prediction and control of indoor pollutant concentrations.
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