Research On The Characteristics Of Indoor And Outdoor Penetration And Sedimentation Of Atmospheric Particulates And Pollution Control

Particles in the atmospheric environment penetrate into the room through the gap even under the condition that the building doors and windows are fully closed,polluting the indoor environment and seriously threatening human health.A large number of studies have shown that modern people spend most of their time indoors and only with outdoor atmospheric particulate concentrations can not accurately calculate the amount of human particulate exposure.Therefore,it is of great significance to study the characteristics of indoor and outdoor seepage and sedimentation of atmospheric particulates and pollution control in the indoor environment of buildings.This article describes the seriousness of particulate matter pollution on human health,and reviews the research on the characteristics of particle sedimentation at home and abroad.The infiltration factor which refers that the particulate matter in the air of the atmospheric environment enters the indoor environment through the building envelope structure,ventilation system,crowd activities,etc and keep the ratio of the concentration of particles in the suspended state to the concentration of particles in the ambient air.Based on the law of conservation of matter,based on the control equations of indoor particulate matter(PM2.5)and carbon dioxide(CO2)concentration as a function of time,non-linear fitting calculations are performed on the continuously monitored indoor and outdoor PM2.5 and CO2 concentration data.The air infiltration and infiltration factor of a typical classroom.According to the root mean square error analysis of the fitting results,it is found that the data processing methods for solving the PM2.5 and CO2 concentration control equations are less error than the data processing methods for separately solving the PM2.5 and CO2 concentration control equations.In this paper,several experiments were performed on a typical classroom.When the mean value of infiltration airflow was 67.45 m3/h,the mean values of penetration coefficient and deposition rate were 0.967 and 0.152 h-1,respectively,and the infiltration factor was calculated to be 0.493.Based on the measured parameters of percolation,this paper establishes the indoor PM2.5 and CO2 concentration prediction models for typical classrooms,and compares and analyzes three types of indoor pollutant control methods,namely the control methods of natural ventilation,air purifiers and fresh air systems.The control effect of indoor particulate matter PM2.5 and gaseous pollutant CO2.The analysis results show that when the air volume of the three control schemes is above 1600m3/h,800m3/h,and 1200m3/h,the indoor PM2.5 concentration can be kept below 80?g/m3 or not higher than the outdoor concentration value and the indoor CO2 concentration is not high than 1000ppm.For the classroom environment,the opening of doors and windows and the outdoor activities of teachers and students during breaks facilitates the diffusion of indoor high concentration pollutants to the outdoor environment.This study provides guidance for reducing particulate matter and gaseous pollution in classrooms and provides a reference for accurately calculating the exposure of students to particulate matter.