Research On Building Ventilation Methods Based On Indoor Air Quality And Energy Saving

In recent years,the problem of decoration pollution and high level about formaldehyde has attracted much attention and poses a great threat to human health.A comprehensive simulation platform for ventilation,indoor air quality and energy consumption is put forward in this paper.The effect of natural ventilation and mechanical ventilation on indoor formaldehyde concentration and energy consumption is analyzed on this platform,to deepen the relationship of ventilation and indoor air quality and energy consumption.The main contents of the study include two parts:natural ventilation and mechanical ventilation.Study on natural ventilation include:analyze different windows under the flow coefficient based on CFD(Computational Fluid Dynamics)simulation software Airpak in calculated amount of ventilation combined with the corresponding DeST-Vent multi zone network model;different windows and doors of the indoor formaldehyde concentration was calculated by a IAQ model;in Beijing city housing as the simulation object comparison of the influence of natural ventilation,the two window of indoor formaldehyde concentration,and in the case of outdoor PM2.5 exceed the standard,calculation of energy consumption due to heating and air purification by additional window.Study on mechanical ventilation ventilator include:intermittent operation and continuous operation two kinds of operation mode,the air quantity is calculated by traditional CO2 control strategy based on indoor formaldehyde and PM2.5 concentration in the fresh air volume is not enough to dilute the indoor pollutants,and puts forward the solution of the inverse problem,obtained minimum indoor air quality requirements the calculated power consumption as the ventilator ventilation and bring additional heating energy consumption.Through simulation analysis,the main conclusions for this simulation object are:diffusion times of ventilation natural ventilation caused by relative pollution has been great,25%of the window opening is enough to dilute the indoor formaldehyde;in the same window one day total time,increase the number of windows can reduce the indoor formaldehyde concentration;in the morning,and late windows 2 h,open windows 25%,windows duration should not exceed 7 h;outdoor PM2.5 exceed the standard,as long as the windows,the indoor PM2.5 concentration is almost the same with the outdoor level;mechanical ventilation in ventilator intermittent operation,fresh air volume based on CO2 control strategy is not enough to dilute the indoor formaldehyde,the use of the solution of inverse problems are the smallest room ventilation frequency is 5.1 h-1 indoor air quality to meet the requirements under the premise of fresh air machine continuous operation more energy-saving than in intermittent operation;In the case of excessive outdoor PM2.5 in winter and indoor decoration pollution,mechanical ventilation is more energy saving than natural ventilation.