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Mathematical Model Of Particle Penetration Through Smooth/rough Building Envelop Leakages

机译：通过光滑/粗糙建筑物包络线渗漏的颗粒渗透数学模型

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摘要

People in China spend about 85% of their time indoor, of which residential building accounts for about 50%. Furthermore, most residential dwellings do not have mechanical ventilation systems, and air infiltrates during heating and cooling seasons. Consequently, human inhalation exposure to particles of outdoor origin depends substantially on the degree to which particles can penetrate the building envelope and remain suspended in indoor air. In this paper, the impact factors of particle penetration are analyzed, and a mathematical model is developed to simulate particle penetration through cracks with rough/smooth inner surfaces. For smooth inner surfaces, the results from the mathematical model show good agreement with the experimental data; for penetration through actual building envelop, the results from the rough surface model shows better agreement than the smooth surface model. It is observed that the roughness of the cracks plays a more important role in influencing deposition of particles with diameter d < 0.04 μm. The roughness mainly influences the Brownian diffusion mechanism of particles deposition. Discrepancies exist between two models and experimental data for particles with diameter ranging from 0.075 to 0.54 μm, which implies that inertia interception caused by roughness plays a more important role in enhancing deposition for particles in this range. The thermal property of the building shell is not an effective factor at removing infiltrated particles.
机译：在中国，人们约有85％的时间在室内度过，其中住宅约占50％。此外，大多数住宅没有机械通风系统，并且在供暖和制冷季节会渗入空气。因此，人类吸入暴露于室外来源的颗粒基本上取决于颗粒可以穿透建筑物围护结构并保持悬浮在室内空气中的程度。本文分析了颗粒渗透的影响因素，并建立了一个数学模型来模拟颗粒通过内表面粗糙/光滑的裂纹的渗透。对于光滑的内表面，数学模型的结果与实验数据吻合良好。对于穿透实际建筑物外墙而言，粗糙表面模型的结果显示出比光滑表面模型更好的一致性。可以看出，裂纹的粗糙度在影响直径d <0.04μm的颗粒的沉积中起着更重要的作用。粗糙度主要影响颗粒沉积的布朗扩散机制。直径在0.075至0.54μm范围内的粒子的两个模型与实验数据之间存在差异，这表明由粗糙度引起的惯性拦截在增强此范围内的粒子沉积方面起着更重要的作用。建筑外壳的热性能不是去除渗透颗粒的有效因素。

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