Study On The Control Of Indoor PM_2.5 In Commercial Building In Chongqing

In recent years,with the economic development,many environmental problems become increasingly prominent,especially the phenomenon of frequent haze,has brought great harm to people's health and life.For the indoor air environment,because the concentration of outdoor PM_2.5 has great impact on the indoor environment quality,and people stay in the room longer,so the indoor PM_2.5 concentration of the greater impact on people's health,should cause people's more attention.At present,one of the most cost-effective ways to reduce the concentration of PM_2.5 in the interior of the building is air filtration technology,and the research on filtration technology has also been studied.The core element of the filtration system is the filter material,the quality of the filter material directly affects the performance of the filtration system.Therefore,it is of great significance to study the filtration performance of the filter material.This paper relies on the national large-scale shopping malls of Chongqing,which are carried out by the National Science and Technology Support Program of the previous year,"Research and Demonstration of Key Laboratory of Indoor Health Environment Control and Improvement"?2012BAJ02B06?Sub-project "Research on Indoor Air Pollution Monitoring and Operation Management Technology" The indoor air quality evaluation research results,concerned about the indoor air PM_2.5 pollution status,and further carry out indoor air PM_2.5 purification experimental study,for indoor air quality assurance key technology research to lay the theoretical foundation.The main research results of this paper are as follows:?1?There is a certain degree of pollution in shopping malls indoor air in Chongqing area,particle size of small particles of stability,small particles of particulate matter concentration of the proportion of high.In the measured sites,PM_2.5 concentration accounted for the proportion of PM₁₀ concentration of 86.8% to 93.5%,so the focus of purification of particulate matter should be directed against fine particles.?2?There are some regularities in PM_2.5 and PM₁₀ concentration in the mall.From the seasons,PM_2.5,PM₁₀ average concentration showed winter> transition season> summer trend.From the daily changes,due to the accumulation of indoor pollution sources at night the accumulation of particulate matter,air conditioning and filtration system is not working,making the indoor PM_2.5,PM₁₀ concentration higher in the morning just when the shopping mall opened,with the working of air conditioning filter system,the concentration of indoor PM_2.5,PM₁₀ decreased gradually,the concentration was low for the noon flow was low,and the concentration of 13:00 to 16:00 in the afternoon reached the lowest point in the day,and after 17:00 pm with the increase of indoor flow PM_2.5,PM₁₀ concentration slowly increased.?3?The experimental results show that the PM₁₀ and PM_2.5 can be used to study the effect of PM₁₀ and PM_2.5 on the filtration efficiency of PM₁₀ and PM_2.5 under the same resistance.Filtering the wind speed,the filtration efficiency increases first with the increase of the wind speed,and the increase of the wind speed to a certain wind speed will lead to the rapid decrease of the filtration efficiency,that is,there is a certain optimal wind speed-efficiency interval,the best interval varies with the materials,The optimum wind speed range is 0.6 0.8m/ s.?4?Through the establishment of the mathematical model and the room of the example of the calculation,we can see that the air conditioning filter and independent purification device filtering effect of limitations,when the outdoor PM_2.5 pollution is more serious or indoor pollution sources to release fine particles,even if the filter system continues to work,indoor PM_2.5 concentration is still possible excessive.