Research And Optimization Of Multi-constraint Ventilation Mode Of Immune Building Based On Dormitory

With the development of the times and the progress of science and technology,exploring a more comfortable and healthy living environment is advocated by more and more people.The dormitory,as a residential building is closely related to people’s daily life.People spend at least one-third of their rest time every day in the dormitory environment.A good sleeping environment in the dormitory helps people overcome fatigue,relieve their body and mind,thus improving human memory and immunity.At the same time,compared with ordinary civil housing,dormitories occupy a smaller area,more number of people,indoor air quality problems are more prominent and more prone to public safety incidents.Therefore,it is of great practical significance to create a suitable,high-quality and safe living environment in the dormitory,so it is very important to study the air distribution of the sleep space in the dormitory.Based on the existing research,four different air supply modes are selected to study the dormitory indoor air quality.Comparative analysis of the difference of indoor flow field under four different working conditions of mixed ventilation,"air rain" flow field,floor air supply and replacement ventilation,and points out the superiority of "air rain" flow field.In addition,the PSO-SVR-PSO coupling algorithm is combined to realize the optimal design of the "air rain" flow field under the multi-objective constraint.The main contents are shown as follows:(1)In order to accurately predict the distribution of indoor airflow organization,build an experimental platform,build a ventilation experimental system,and compare the simulation results with the experimental data to verify the reliability of the numerical model.(2)In order to study the differences in the distribution of airflow structure in the steady-state flow field in the dormitory under different air supply conditions.The physical model of dormitory was established,and different ventilation strategies were explored and analyzed based on thermal comfort and safety as the evaluation criteria through numerical simulation.In this study,the propagation and diffusion of aerosol particles in the dormitory when the single source of infection in the room is in different positions was compared with different ventilation strategies,and the infection probability of susceptible indoor patients under 8 hours of sleep and the concentration of pollutants in the human breathing area were comprehensively evaluated by the Wells-Riley equation.Finally,the "air rain" flow field is selected for optimization.(3)The limitations of the "air rain" flow field were optimized and analyzed,considering the changes of air supply parameters,changing the position of the air outlet,air supply temperature,air supply speed,air supply Angle and other input parameters,analyzing the changes of the flow field in the dormitory,and putting forward the suggestions of improving the air inlet to both sides of the air inlet and the lower wall return air.(4)The "air rain" flow field is optimized with multiple objectives.Considering comfort constraints PMV,immune constraints P,energy constraints,through the CFD combined with PSO-SVR-PSO algorithm,based on data processing methods such as data normalization,questionnaire survey weighted score,data driven multi-objective optimization,the final air inlet optimization form of 440 mm,air supply angle 87,radian 240 mm,speed of 0.086 m/s,air supply temperature 297.5 K optimal return outlet structure,position and air supply parameter design.