Study On Variation Of Indoor Natural Ventilation Pollutants Concentration Based On Numerical Simulation

Natural ventilation is a good ventilation mode,which brings fresh air to indoor,only relys on natural resources to maintain good indoor environment.Not only is it beneficial to people's physical and mental health,but also accords with energy conservation and emissions reduction strategy.But with the development of the industry,the deterioration of environment,outdoor pollutants exceeds bid,natural ventilation can sometimes bring pollution into indoor,so that outdoor pose a threat to human health.So it is our new work target to clear the influence of natural ventilation on indoor pollutants mechanism and build a healthy and comfortable environment.First of all,taking Shenyang for example,this paper used theory of differential pressure palmer hours of Shenyang,analyzed the potential of natural ventilation,verify the feasibility of natural ventilation in Shenyang.Next choose a two rooms one hall a district of a typical residence as the research object,according to the meteorological parameters and combining with the building in Shenyang,as the boundary conditions of indoor natural ventilation simulation,building simulation model using numerical simulation software.Simulate the carbon dioxide concentration field under thermal natural ventilation and wind pressure natural ventilation under indoor different initial concentration of carbon dioxide,analyzed the natural ventilation purification effect and regularity of indoor pollution based on related standard.Second,based on the Shenyang meteorological parameters and monitoring numerical,the concentrations of PM2.5 outdoor indoor and velocity field were simulated under different wind speed and background of natural ventilation,analyses the effect of natural ventilation and pollution law of the indoor environment.Then we can discovered according to analyze and compare the two kinds of pollutant concentration field distribution:when the PM2.5 concentration in indoor is overweight outdoor not,excess carbon dioxide is not,natural ventilation can purify indoor carbon dioxide pollution,when the concentration of PM2.5 outdoor background is more than 150?g/m3,it is not suitable for natural ventilation,and summed up the law of the mutual influence of indoor air quality between two kinds of pollutants,put forward the residential indoor natural ventilation optimization tactics when the two pollutants exist.Finally,this paper introduces the currently used two-way flow of residential fresh air system,analyzes the principle of purification filter pollution fresh air system,and based on the equipment parameters and the project,set up fresh air system in the numerical simulation model,simulates the model of residential indoor carbon dioxide and PM2.5 concentration field when applying on fresh air system,and compared the effect of natural ventilation and residential in purifying indoor pollutants in air system.