Influence Of Different Ventilation Modes On Air Quality In Student Dormitory

January 2020,a worldwide epidemic,and break the original calm,people live in epidemic prevention and control work,the students’dormitory of epidemic prevention and control has become the top priority,the prevention and control work more complex more cause the attention of the public healthcare promenade in the dormitory,the existing problem has the following characteristics,number 1,each layer of living,the habit of students to close the door after door,forming the possibility of draught small;2.The ventilation probability of the most unfavorable ventilation point is small;3.The length of the wind approach path（the path of the wind from the outdoor to the point requiring ventilation）;4.There are no balconies in the corridor-style dorms in the school district.Washed clothes are hung over the corridors for a long time,which provides living space for bacteria and viruses,and makes the original"poor"ventilation conditions even worse.In view of the current problems,this thesis from the dormitory survey,field tests and other aspects,according to the students’subjective evaluation and data to confirm the authenticity and seriousness of the problem.Teaching building natural ventilation at home and abroad on the basis of present research situation and results of research,mainly including the following:first,selecting typical cold areas of higher school dormitory as the research object,the internal existent promenade dormitory corridor of wind speed,CO₂concentration and relative humidity field measurement,analyzes the factor influencing existent promenade in the dormitory building indoor and ventilated;Second,in the original draft status（ventilation mode 1,natural ventilation）,on the basis of comprehensive consideration in existent promenade dormitory indoor ventilation requirements,through to the corridor on both sides of the way of adding fan above the Windows（ventilation mode 2,mechanical ventilation）,induction of the wind outdoor（CO₂concentration to 510 ppm,relative humidity of 42%）entered the building,after field measurements,on both ends of the dormitory near a window ventilated effect is clearly relative humidity can reduce 7%at most,can reduce CO₂concentration up to 100ppm,but there is no change to the middle position ventilation effect of the corridor.Then,put forward the improvement scheme（three ventilation mode,the mechanical exhaust）,in the dormitory corridor installed above the exhaust pipe,open to the outside wind exhaust fan,lead to the ventilation system of air duct above the door window parts form the negative pressure,air from the dormitory on side of the window outdoor,enter indoor,dilute the indoor pollutants,finally through the duct outside;Finally,using the Sketch Up model,choose standard k-epsilon turbulence model calculation of interior flow field through phoenics2016 software simulation working condition of 8kinds of set,come to the conclusion that when the air changes for 5h^-1,the condition 6ventilation effect is best,which much of the existent promenade dormitory indoor velocity field distribution of more than 0.1m/s,on both sides of the window in the hallway about wind speed 0.25m/s,dormitory inside the middle aisle area of the wind speed is about0.13m/s;Dormitory indoor air age for the middle aisle position as the 200s,the dormitory corridor air age value of 200-700s,six to eight contrast condition,found the window open degree is associated with ventilation effect,the area of the window open and indoor is inversely proportional to the wind speed,degree of Windows open for a quarter,dormitory corridor of the wind speed is the largest,when all the Windows open,the dormitory corridor of the wind speed is minimal.Therefore,under the condition of the ventilation frequency,the reasonable opening area of the window can meet the indoor ventilation requirements.There are 34 pictures,8 tables and 101 references.