Optimization Of Teaching Space In Primary And Secondary Schools Based On Indoor Air Quality Improvement

With the comprehensive advancement of the strategy of rejuvenating the country through science and education,improving the quality of basic education and creating a good educational environment for the healthy growth of young people has become the common aspiration and goal of the whole society.For a long time,due to the relatively backward economic level,although the quality and safety of the primary and secondary schools have reached the standard,the physical environment of the teaching space is low,and the ventilation of the classroom is insufficient,especially the indoor air quality in the classrooms in winter and summer has caused the society is widely concerned.In the winter and summer,in the classrooms with natural ventilation mode,the doors and windows are usually closed during the class to meet the requirements of indoor human thermal comfort,resulting in low ventilation in the room,and intermittent natural ventilation during the class will generate a large amount of indoor and outdoor heat.Exchange,so that the indoor temperature changes abruptly,so the classroom ventilation and thermal comfort form a pair of irreconcilable contradictions.Some primary and secondary schools choose the fresh air system of active air purification,but there are problems such as high investment,high operating cost and high maintenance cost.This study combines the characteristics of the architectural space model of primary and secondary schools,innovatively uses the principle of negative pressure ventilation,and builds a classroom-assisted mechanically-assisted negative pressure ventilation system through external wall exhaust fans and interior side high side windows to improve the classrooms of winter and summer primary and secondary schools.The goal of indoor thermal comfort and air quality is to adjust and optimize the teaching space and facilities of primary and secondary schools,and to reduce the thermal energy consumption in the classroom in winter and summer.Firstly,based on the actual survey and Airpak software simulation,the feasibility of mechanically assisted negative pressure ventilation in a single classroom was verified on the basis of studying the distribution law of CO₂concentration in closed classrooms.Furthermore,the three elements of the classroom mechanical auxiliary negative pressure ventilation system—the combination of high side windows,exhaust fans and indoor temperature,are used to influence the environmental indicators such as CO₂ concentration,air age,temperature field and wind speed field in the classroom.Negative pressure ventilation design.Then it discusses the three different spatial organization modes of the teaching building when using mechanically assisted negative pressure ventilation-the optimization design strategy of the single-corridor series fixed ordinary classroom,the single corridor combined with the high space mode,and the high atrium mode teaching building,and finally applied to the design.Verification in practice.In recent years,the state’s large capital investment in educational buildings has provided a good opportunity for the development of this research.The mechanical auxiliary vacuum ventilation system of the classroom has the characteristics of light technology,low energy consumption and easy operation.It can be widely used in the renovation of primary and secondary schools to improve the quality of the teaching environment.The main work and achievements of this research are:1.The actual classroom test of the ordinary classrooms of Xi’an schools and the application of mechanical auxiliary negative pressure ventilation system,found that when the mechanical auxiliary negative pressure ventilation system is applied,the concentration of carbon dioxide in the classroom can be significantly reduced,and the mechanical auxiliary negative pressure ventilation is confirmed.The feasibility of the system is obtained,and the dynamic distribution law of CO₂ in the classroom under the closed classroom and the mechanical auxiliary negative pressure ventilation system is obtained,and the simplified formula of CO₂ in the classroom is corrected.2.Optimize the design of the single classroom facilities under the mechanical auxiliary negative pressure ventilation system,that is,the optimal configuration scheme of the external wall exhaust fan,the inner wall high side window and the indoor radiator.3.Optimize the design of the different spatial organization modes of the three teaching buildings under the mechanical auxiliary negative pressure ventilation system,namely the ordinary corridor mode,the high space mode and the high atrium mode on the outside of the ordinary corridor,and propose to teach the outdoor wall exhaust fan.Optimal configuration of interior wall high side windows,corridor temperature,corridor or atrium inlet fan.Improving the air quality of classrooms in primary and secondary schools can effectively promote the healthy growth of students and improve the quality of teaching.Therefore,it is of importance and urgency.This research involves the renovation of tens of thousands of existing primary and secondary schools,with great practical significance and considerable economic value.