Numerical Simulation And Exclusion Analysis Of Indoor PM_2.5 In Office Buildings Under Hot And Wet Microclimate

In recent years,indoor air pollution has frequently been a problem,especially in the first-tier cities in the South China Pearl River Delta region under the environment of high temperature and high humidity.The health problems caused by PM_2.5.5 particles in office rooms have attracted widespread public attention.PM_2.5.5 particulate matter in the atmospheric environment with increasingly serious pollution is used as outdoor pollution source,and it continuously penetrates into the contaminated indoor air through the gap of the envelope structure;office staff and office equipment in the office are the main indoor pollution sources that produce PM_2.5.5 particulates.Office building indoor environment as a typical micro-environment,the temperature of most office air conditioners is set to 26℃because of energy saving requirements,but the actual temperature and humidity in the room is significantly higher than the temperature and humidity of air conditioners,which exacerbates the air quality of the office building’s indoor micro-environment pollution levels.Therefore,it is necessary to understand the influence of temperature and humidity on the PM_2.5.5 mass concentration in the office building and the general rules of PM_2.5.5 particle distribution in the office building under the hot-wet micro-environment.The main content of this article is:First,the indoor and outdoor temperature,relative humidity,and PM_2.5.5 mass concentration of the target office were measured using a temperature and humidity meter and a portable PM_2.5.5 detector.According to the actual measurement results,the effect of temperature and humidity on the PM_2.5.5 mass concentration was analyzed.Second,the numerical simulation and analysis of indoor PM_2.5:Through the study of simulated PM_2.5.5 mass concentration and its distribution in hot and humid conditions,the previous test results are further verified.The distribution of PM_2.5under high-temperature and high-humidity conditions was analyzed,and the general distribution of PM_2.5.5 in the room was obtained.Third,the simulation and analysis of the effect of ventilation mode on indoor PM_2.5.5 removal:Through the study of different ventilation modes in the high temperature and humidity conditions of the removal rate of PM_2.5.5 and PM_2.5distribution.Give a ventilation pattern that facilitates the discharge of PM_2.5,and give suggestions and strategies for optimizing the ventilation mode.The results show that conclusion 1:The increase of temperature and relative humidity will increase the indoor PM_2.5.5 mass concentration.For every 2℃rise in temperature,the PM_2.5.5 mass concentration increased by 1.16¹.37 times.For each5%increase in relative humidity,the mass concentration of PM_2.5.5 increased by approximately 4.87⁹.72μg/m³,the relative humidity increased by 25%,and the mass concentration of PM_2.5.5 increased by 35.85%.The indoor environment of high temperature and high humidity increased PM_2.5.5 dispersion and diffusion of particulate matter.Conclusion 2:The PM_2.5.5 removal rateη₁ is 98.839%for the side feedback ventilation mode.The PM_2.5.5 removal rate is the highest for the side feedback ventilation mode,followed by the top feedback ventilation mode.The bottom feed back top ventilation mode has the lowest removal rate of PM_2.5.Finally,it is concluded that an excellent ventilation mode must have airflow throughout the interior space.