A Simulation Analysis Of The Measures To Improve Air Quality In A University Step Classroom Based On Airpak

The classroom is the main place to academic exchanges between teachers and students,with personnel density is big,utilization rate is high,the characteristics of mobility,classroom air quality is good or bad directly affect indoor teachers' and students' mental states and physical and mental health.According to statistics,most of the northern school building ventilation in summer more than in the form of natural ventilation,but,for the sake of building size and the overall design plan will inevitably appear individual classroom under the adverse conditions,make the classroom cannot effectively discharge pollutants,seriously affect the indoor air quality.In this background,this topic to a university in Shenyang a typical amphitheatre as an object,through field investigation and theoretical analysis,numerical simulation of the method of combining the study of the current air quality problems existing in the classroom,puts forward the corresponding reform scheme,seeking the best way to improve the effect of natural ventilation in summer.Through to the student questionnaire survey found that most students said on the thermal environment and air quality of the classroom are not satisfied,especially during the mid to late June and early July class,classroom sultty,peculiar smell,seriously affected the normal teaching environment.Among them,the personnel density is large,the course arrangement is compact,the natural ventilation quantity is insufficient is the main factor that causes these problems.Therefore,we suggest that the school at the same time of reasonable arrangement of teaching link,without affecting the classroom both optimization on the base of the structure,the focus is on the window of the transformation,in order to strengthen the effect of natural ventilation,achieve the goal of improving teaching environment.Building model is set up,using Airpak software simulation analysis under the condition of natural ventilation,the classroom in three operating conditions(self-study,exams,classes)the indoor air distribution under the condition and pollutant diffusion,the conclusion is:self-study the classroom and the test condition,indoor temperature,wind speed and average of CO2 concentrations arc within the scope of the standard;And when the number of classrooms and more intensive,the working class(155 people),the temperature and CO2 density in the classroom are on the high side,indoor average temperature of 28.2 ?,average and indoor CO2 concentration was 0.1022%,and more than the national standard limit of 0.07%,especially in local area near the back of the classroom wall side exceeds bid badly phenomena of the CO2 density as high as 0.1291%.This topic has designed four different doors and Windows in the open position and the number of combinations,and two interior wall of the bearing structure to increase the corridor window scheme,simulation analysis of the six schemes under natural ventilation conditions of indoor temperature field,velocity field,the CO2 concentration field and the distribution of air age,the conclusion is:the amphitheatre in class only rely on the current existing Windows for ventilation is not enough to make the air quality of classrooms is effectively improved,must therefore be interior wall add window in the classroom.Eventually get the best reconstruction scheme case6,namely,in keeping the outside window wcl,wc3,wc5 and the front door and back door of the classroom open under the premise of interior wall respectively set up in the classroom and on the inner wall of the classroom,there are three outdoor Windows corresponding to the opening of the classroom and the size is 0.8*0.6m,at the same time in the back row of the classroom,each side of the inner wall shall have an inner window with a size of 0.8m*0.6m,the top height of the inner window is 2.6m,natural ventilation,at this time the conditions of temperature,wind speed,concentration of CO2 and air age correspond to the average of 27.4?,0.21 m/s,0.0617%and 123 s,all meet the specification standard,at this time,the thermal comfort and freshness of the classroom have been effectively improved.