Analysis of the impact of particle filtration on indoor particle concentrations

摘要

Model simulations of the impact of various levels of particle filtration on the concentration and particle size distribution of indoor particles are presented. The results of several different scenarios are presented for buildings with mechanical and natural ventilation. Scenarios include cases where particles enter from the outdoors and where particle sources are located indoors. All the outdoor air entering the buildings with natural ventilation enters through the building shell. Although the majority of the outdoor air entering the buildings with mechanical ventilation enters through the heating, ventilating, and air conditioning (HVAC) system, some outdoor air is assumed to enter through the building shell. The buildings with natural ventilation are assumed to have a heating and air conditioning (HAC) system that circulated air inside the building. The simulations include the effects of particle penetration through the building shell and particle deposition to indoor surfaces. Filter efficiency as a function of particle diameter used in the simulation is based on experimental studies conducted by EPA. The simulations show that particles with physical diameters in the 0.2 to 1 μm range are least affected by commonly available particle filters.