Ventilation are widely used in residential buildings to dilute indoor pollutants. While the dynamic partition model of semi-volatile organic compounds (SVOCs) for homes with a central forced-air handling system is still far from adequate. Here we developed a mechanistic model of SVOCs considering dynamic behaviours of size-resolved particles brought by ventilation. In this model, effects of air changes per hour (ACH) and secondary source of particles on mass transfer coefficient of source surfaces () are considered. Three factors, namely ventilation mode, fresh air ratio and filtration efficiency are examined in detail, to figure out the time-varying multi-phase concentration of di-2-ethylhexyl phthalate (DEHP). Results show that with identical ACH (total ventilation rate/volume), the increase of indoor-outdoor air exchange rate (AER_I/O), would decrease the gas-phase concentration of DEHP, and would significantly shorten the time for the multi-phase DEHP to reach equilibrium concentration. The multi-phase (including the gas-phase, particle-phase and dust-phase) equilibrium concentration of DEHP indoors decreases with the increased fresh air ratio, taking into account the combined effect of ventilation dilution and particle-enhanced source emission. With the increase of filtration efficiency, the particle-phase equilibrium concentration of DEHP decreases, while the gas-phase equilibrium concentration of DEHP increases. Overall, the dynamic model is helpful to improve understandings of SVOCs’ interactions with airborne particles caused by ventilation systems, and clarify the key ventilation factors affecting the time-varying multi-phase concentration of SVOCs.

中文翻译：

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考虑不同通风模式下 DEHP 与颗粒物的相互作用，预测室内 DEHP 的命运和传输


通风广泛应用于住宅建筑中以稀释室内污染物。然而，对于具有中央强制空气处理系统的家庭来说，半挥发性有机化合物（SVOC）的动态分区模型仍然远远不够。在这里，我们开发了一个 SVOC 的机械模型，考虑了通风带来的尺寸分辨颗粒的动态行为。在此模型中，考虑了每小时换气量 (ACH) 和二次颗粒源对源表面传质系数 () 的影响。详细考察通风模式、新风比和过滤效率三个因素，计算出邻苯二甲酸二-2-乙基己酯（DEHP）随时间变化的多相浓度。结果表明，在ACH（总通风率/风量）相同的情况下，增加室内外空气交换率（AER_I/O），会降低DEHP气相浓度，并显着缩短多相反应时间。 DEHP达到平衡浓度。考虑通风稀释和颗粒物强化源排放的共同影响，室内DEHP多相（包括气相、颗粒相和尘相）平衡浓度随着新风比例的增加而降低。随着过滤效率的增加，DEHP颗粒相平衡浓度降低，而DEHP气相平衡浓度升高。总体而言，动态模型有助于提高对SVOCs与通风系统引起的空气颗粒相互作用的理解，并阐明影响SVOCs时变多相浓度的关键通风因素。