Dynamic Estimation Model Of Indoor Pollutant Concentration Based On Conservation Of Mass And Its Application

The problem of indoor air pollution affects the quality of human life and physical and mental health.Fully understanding and mastering the real-time changes of indoor air pollutant concentration is the basis for indoor pollution process evaluation and analysis,indoor pollution influencing factors analysis and indoor pollution improvement measures,etc.,and has a positive effect on improving indoor air quality and protecting people's physical and mental health.In this paper,residential buildings are taken as the research object.By establishing a dynamic estimation model of indoor PM2 5 and CO2 concentration,the variation law of indoor PM2.5 and CO2 concentration in typical residential buildings is analyzed under the presence of different pollution sources;The main indoor air pollution control strategies for indoor air pollution control effect.Main conclusions:(1)Analyze the transmission mechanism of indoor and outdoor pollutants,establish indoor PM2.5 and CO2 concentration dynamic estimation models,derive models under three ventilation modes of mechanical ventilation,natural ventilation and osmotic ventilation,and establish a quantum model of ventilation.Determine the building parameters,and determine the model parameters through experimental measurements,theoretical formula calculations,and literature surveys.Use matlab software to write programs to solve equations.Taking the master bedroom of a typical residential building as the experimental object,the experimental data and the model calculation results are fitted to verify the accuracy of the model.(2)Analyze the variation rule of indoor PM2.5 and CO2 concentration in the presence of different pollution sources.When there is no PM2.5 source indoors and there is PM2.5 pollution in the outdoor atmosphere,the indoor PM2.5 concentration change trend is a bimodal change.When the outdoor PM2.5 pollution level is moderate and light pollution,the indoor pollution level is light pollution and good level,respectively.When the source of indoor PM2.5 is the smoking behavior of indoor people or the burning of cooking fuel,the indoor PM2.5 concentration change trend is a single peak shape.When only one person smokes indoors,the indoor PM2.5 pollution level has reached serious pollution;the number of smokers increases and the indoor PM2.5 concentration increases.The indoor PM2.5 concentration levels under the three fuels are all severely polluted.After stopping smoking(or cooking)for 1 hour,the pollution levels are still severe or severely polluted.When the source of indoor CO2 is the respiration of indoor personnel,the trend of indoor CO2 concentration is gradually increasing.In the state of lying down and sitting still,the concentration of CO2 belongs to clean air;in the state of walking,people with sensitive concentrations will feel uncomfortable.The indoor population increases,and the indoor CO2 concentration increases.(3)Simulate and evaluate the indoor air pollution control effects of several indoor air pollution control strategies mainly on ventilation and purification.When there is no PM2.5 source indoors and there is PM2.5 pollution in the outdoor atmosphere,a natural ventilation strategy is adopted.The smaller the window area,the lower the indoor PM2.5 concentration;the purification strategy is adopted to increase the purified air volume to 300m3/h.The PM2.5 concentration is reduced,and then increasing the purified air volume has little effect on the indoor PM2.5 concentration;the mechanical ventilation strategy is adopted,and the fresh air volume is increased,and the indoor PM2.5 concentration is increased.When the source of indoor PM2.5 is the smoking behavior of indoor personnel or the burning of cooking fuel,natural ventilation strategy is adopted,the larger the window area,the lower the indoor PM2.5 concentration;the purification strategy is adopted,the greater the purification air volume,the indoor PM2.5 The lower the concentration;the mechanical ventilation strategy is adopted,the amount of fresh air increases,and the indoor concentration decreases.When the source of indoor CO2 is the breathing effect of indoor personnel,natural ventilation strategy is adopted,the area of the window is reduced,and the indoor CO2 concentration is increased;mechanical ventilation strategy is adopted,and the amount of fresh air is reduced,and the indoor CO2 concentration is increased.