Study On Characteristics Of Indoor Air Purification System Coupled With Adsorption And Heat Storage

With regard to air pollution,particulate matter has become an air pollutant in many cities.These particulate matter will lead to a decline in indoor air quality and endanger human health.Therefore,we need to use effective methods to purify indoor particulate matter and maintain a comfortable indoor environment.In this context,this article constructs an indoor air purification system coupled with adsorption and heat storage.The system realizes the functions of heat storage and air purification by setting the exterior wall of the building as a hollow structure and filling it with adsorption materials and heat storage materials.It can not only remove particulate matter and gaseous pollutants in the indoor air,but also can passively save energy through heat storage,and does not occupy indoor space.On this basis,this paper builds an indoor air purification system experimental platform coupled with adsorption and heat storage.The effect of the adsorption materials and heat storage materials adding amount on the purification of PM2.5 and PM10 in the system was experimentally studied.At the same time,the influence of the adding amount of heat storage materials on the heat storage characteristics of the system was studied.On the basis of experimental research,software is also used to numerically simulate the pressure field,flow field,heat storage,particle movement and concentration distribution of the system during operation.The theoretical basis of system operation is analyzed,and the simulation solution and experimental data are compared and analyzed.Through research,it is found that the system can effectively remove particulate pollutants in the air.It mainly uses the collision of particles and walls,the collision of particles and adsorption materials,the capture of particles by adsorption materials,and the gravity sedimentation of particles to remove particulates.After 120 minutes of purification experiment,under heat storage conditions,the purification efficiency of the system for PM2.5 and PM10 is greater than 90%,and it can effectively reduce the concentration of particulate matters in the experimental chamber from heavy pollution to a qualified level.As the adding amount of activated carbon gradually increases,the purification efficiency of the system gradually increases.When the adding amount of the adsorbent materials and the heat storage materials are the same,the purification efficiency of the system for particulate matter under heat storage conditions is slightly greater than that under non-heat storage conditions.By measuring the natural attenuation rate of particulate matters in the experimental chamber,it is found that when the adsorbent and heat storage materials are not added,the natural attenuation rate of PM2.5 in the experimental chamber is 5.45%,and that of PM10 is 15.53%.Compared with the purification efficiency of the system,the natural attenuation rate is negligible.Adding phase change heat storage materials to the system can reduce the heat exchange between indoor air and outdoor air through the purification system.In the heat storage condition,when the heat storage materials is added,the system outlet air temperature is about 23.9～25.6°C;when the heat storage materials is not added,the system outlet air temperature reaches 26.4°C.When the activated carbon and phase change heat storage materials in the system are added with 50% each,the purification efficiency of the system for PM2.5 and PM10 is 92.34% and 93.04%,respectively.And this working condition is the best for taking into account purification efficiency and heat storage characteristics.