【摘要】 目的室外颗粒如何进入室内与建筑物的通风方式有关,建筑物的通风方式有机械通风、自然通风和渗透换气。其中以渗透换气为载体的通过围护结构缝隙的颗粒渗透,是一种最常见的、也是最难以控制和监测的室内外颗粒交换形式,同时,它对室内颗粒浓度的影响十分显著。研究室外颗粒对室内环境的影响。方法运用质量平衡方程,给出3个实验条件尽量接近的假设,在此基础上,用I/O ratio来计算渗透系数,通过测试得出相关数据。结果得出了不同粒径范围内粒子室内外浓度不同时间的值。结论对于空气动力学直径大于0.3微米的粒子,渗透系数随着粒径的增大而降低;空气中PM_2.5粒子的浓度越大,渗透系数也越大。更多还原

【Abstract】 Objective How outdoor particles enter the room is related to the ventilation mode of the building, which includes mechanical ventilation, natural ventilation and infiltration ventilation.Among them, the particle infiltration through the gap of enclosure structure with infiltration and ventilation as the carrier is the most common form of indoor and outdoor particle exchange, which is also the most difficult to control and monitor.It has also a significant impact on indoor particle concentration, so it is one of the most concerned problems in the study of the law of outdoor particles affecting indoor.Methods Experimental models were used to determine the definition of the permeability coefficient, i.e.the proportion of outdoor particles that can enter the room and remain suspended.Three hypotheses in which the experimental conditions were as close as possible were given.On this basis, the I/O ratio was used to calculate the permeability coefficient, and the relevant conclusions were drawn through the analysis of the test data.Results The definition was used to characterize the degree of exposure of people in a closed room to external particles.Conclusion For particles with an aerodynamic diameter larger than 0.3 micron, the permeability coefficient decreases with the increase of the particle size.The higher the concentration of PM_2.5 particles, the larger the permeability coefficient.更多还原