Research on the dispersion and management of PM2.5 levels in office environments within cold climates

PM2.5, defined as particulate matter with an aerodynamic diameter of less than 2.5 micrometers, is an inhalable particulate that can remain suspended in the air for extended periods. As a significant pollutant detrimental to human health, PM2.5 has become one of the major concerns, especially in cold regions where indoor pollution is exacerbated. Therefore, studying the concentration of PM2.5 in office environments within cold regions is of profound significance. This study examines the impact of various air supply configurations (such as opposed side top-to-bottom, same side topto-bottom, and bottom-to-bottom), different indoor air supply velocities, and varying occupant numbers (considering the human body as a source of indoor pollution) in an office located in a cold region of China. Utilizing Fluent software for simulation and analysis, the study investigates the movement and distribution of indoor PM2.5, with a focus on the human breathing zone as the reference plane. The analysis includes the examination of PM2.5 concentration distribution maps and fine particulate matter trajectory maps. The simulation results indicate that indoor air quality is optimized when the air supply is configured in a same side top-to-bottom arrangement, with higher air velocities and a lower number of occupants. Additionally, the installation of an air purifier at the air supply outlet has been shown to effectively manage indoor air quality.