气流组织形式对室内微生物气溶胶浓度的影响

发布时间：2018-01-16 16:32

本文关键词：气流组织形式对室内微生物气溶胶浓度的影响　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：近些年,闻霾色变,室外空气环境质量已经引起了人们足够的重视,可谓社会热点环境问题之一。相比较,我们对于绝大部分时间处在的室内空气环境研究甚少。在室内空气环境的研究中,微生物气溶胶和大气细颗粒物已越来越受到国内外学者广泛而高度的重视。因此,开展空调系统下的室内环境在不同气流组织形式下微生物气溶胶与大气细颗粒物的研究,对于探究室内空气环境质量有着重要意义。本实验于2014年12月—2015年1月于长安大学朱雀校区气流实验室,选用Andersen六级撞击式空气微生物采样仪和PC-3A(S)型粉尘检测仪分别对于气流室内外微生物气溶胶和大气细颗粒物进行了采样研究,详细考察在室外为非霾天状况下,通过调配不同送排风气流组织形式及变化换气次数,密闭室内建筑环境大气微生物气溶胶和大气细颗粒物(PM2.5)的污染变化状况、水平及影响因素。结论如下:(1)气流室内不同工况下的PM2.5浓度峰值均出现在换气次数为1次/h时,最小值均在换气次数为4次/h时,相比于换气次数为0次/h时,降幅分别达到了17.9%、30.9%、11.4%。(2)不同工况下的气流室内微生物气溶胶浓度均存在着较大的差异,同时细菌微生物气溶胶浓度显著大于真菌微生物气溶胶浓度(p0.05)。其中,在换气次数为1次/h时,室内微生物气溶胶浓度在大部分工况下会出现突增,随后随着换气次数的增加逐渐降低。总之,通过室内外空气交换,室内微生物气溶胶的浓度有着一定程度的变化,即对室内空气品质有着相应的影响。(3)在气流室内不同工况下,微生物气溶胶粒径主要分布在0.65-4.7μm的范围。同时,可吸入细菌气溶胶占细菌气溶胶的比例,在20.1%-84.9%的范围,可吸入真菌气溶胶占真菌气溶胶的比例波动在53.8%-79.8%的范围。另外,细菌气溶胶的中值直径显著大于真菌气溶胶(p0.05)。其中,细菌中值直径的最大值出现在侧送门排,真菌出现在侧送底排。⑷在气流室不同送排风组合形式及换气次数下,大气细颗粒物PM2.5浓度与细菌、真菌气溶胶浓度的相关性上,侧面送风顶部排风的相关性要好于侧面送风对门排风、侧面送风底部排风。
[Abstract]:In recent years, the smell of haze pale, the air quality of the environment outdoor has attracted enough attention, is one of the hot social environmental problems. In comparison, we research on indoor air environment in most of the time is very little. In the study of indoor air environment, microbial aerosol and atmospheric fine particles have been increasingly favored by domestic and foreign scholars the high degree of attention. Therefore, the research of microbial aerosol and atmospheric fine particles in different airflow organization form to carry out air conditioning system of the indoor environment, and has an important significance to explore the indoor air quality. This experiment in December 2014 to January 2015 in Chang'an University campus were selected to Suzaku lab, and PC-3A Andersen six cascade impactor sampling air microorganism (S) type dust detector respectively for indoor air microbial aerosol and atmospheric fine particles into the line Sampling research, detailed investigation in non haze days for outdoor conditions, through the deployment of different air supply and exhaust air distribution and change of ventilation frequency, closed indoor building environment of air microorganism aerosol and atmospheric fine particles (PM2.5) pollution status, level and influencing factors. The conclusions are as follows: (1) the peak concentration of PM2.5 in indoor air under different working conditions were found in the air 1 times /h, the minimum value in the air 4 times /h, compared to the air 0 times /h, the decline reached 17.9%, 30.9%, 11.4%. (2) under different conditions of indoor air microbial aerosol concentration there were obvious differences at the same time, microbial aerosol concentration was significantly greater than that of fungi microbial aerosol concentration (P0.05). Among them, in the air 1 times /h, indoor microbial aerosol concentration will spurt in most working conditions, then with ventilation The increase of the number gradually decreased. In short, through the exchange of indoor and outdoor air, the concentration of indoor microbial aerosol has a certain degree of change, namely, with a corresponding impact on indoor air quality. (3) in indoor air under different working conditions, microbial aerosol particle size range is mainly distributed in 0.65-4.7 m. At the same time, can be inhalation of bacteria aerosol for bacterial aerosol ratio in the range of 20.1%-84.9%, inhalation of fungal aerosol proportion of fluctuation of fungal aerosol in the range of 53.8%-79.8%. In addition, the median diameter of bacterial aerosol was significantly greater than that of fungal aerosol (P0.05). Among them, the maximum bacterial median diameter appeared in the side door row, appeared in fungi the bottom row of the lateral supply. In different airflow chamber ventilation combined form and ventilation frequency, atmospheric particulate PM2.5 concentrations and bacteria, related fungal aerosol concentration, the top side air exhaust The correlation is better than the side air supply to the door exhaust, the side air supply bottom exhaust.

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X51;TU831

【共引文献】