Study On Optimization Strategy Of Central Fresh Air Purification System

With the continuous development of technology and the continuous improvement of people’s living standards,people’s requirements for architecture are not only to shelter from the wind,but to pay more attention to whether it can bring us a more comfortable living and working environment.Therefore,interior decoration has become a hot spot for people to pursue quality of life.However,with the use and popularity of building materials and furniture in decoration,the indoor air quality of the house has rapidly declined.At the same time,with the rapid development of the national economy and the implementation of the industrial approach to revitalization,the problem of deterioration of the atmospheric environment has become more and more prominent.The pollutants emitted from various pollution sources such as automobiles and boilers have a great influence on indoor air.Therefore,a series of central fresh air purification systems came into being,but due to the uneven quality of equipment and related designers,the purification effect of the fresh air system in practical applications is not satisfactory.In order to explore the optimization strategy of the central fresh air purification system in the application process,firstly,this paper takes an office room in Shenyang witch has been installed a central air fresh air purification system as the research object,and the indoor gaseous pollutants carbon dioxide(CO2),formaldehyde(HCHO)and outdoor solid particulate pollutant PM2.5 were selected as the three pollutant targets to measure indoor air quality.The experimental platform of central fresh air purification system was set up to test the purification effect of outdoor particle pollutant PM2.5 under different air supply volume.The concentration of pollutants in the room under the three conditions of no ventilation,natural ventilation,and mechanical ventilation of the window were compared.It was found that the concentration of pollutants exceeds the range that the human body can bear when the indoor air is not ventilated for a long time.Under the weather condition of "haze" outbreak,mechanical ventilation can guarantee the indoor air quality better than natural ventilation.Secondly,the indoor air environment under mechanical ventilation in office room is analyzed by numerical simulation method.The results show that the simulation results are in good agreement with the experimental results,and it is reasonable to study indoor air quality by the model established in this paper.Finally,this paper simulates the airflow organization and pollutant concentration in the central fresh air purification system under different air supply modes.The results show that the indoor air distribution is the best under the condition of displacement ventilation,the average concentration of pollutants in the whole room is the smallest,and the uniformity of pollutant concentration in the office area is the best.Therefore,the displacement ventilation is chosen as the optimization scheme of the central type fresh air purification system in this room.The concentration of pollutants in the whole room is the lowest when the exhaust air outlet is located above the storage cabinet under the three kinds of air outlet positions,so the location of the air outlet above the storage cabinet is selected as the optimal scheme of the outlet position of the central fresh air purification system in our room.With the increase of air supply and exhaust volume,the filtration efficiency of PM2.5 particulate pollutants decreases,which leads to the increase of indoor PM2.5 concentration.Therefore,when the outdoor haze weather breaks out,it is suggested that the central fresh air purification system should be operated with low wind speed to protect the indoor concentration of PM2.5 in the range of human satisfaction.