摘要
Abstract
Taking the classrooms of Zhengzhou Middle School as a case study,we utilized Fluent software to construct a numerical model of the indoor environment.This model simulated the variations in indoor CO2 and PM2.5 concentrations under two different ventilation conditions:sealed windows and natural ventilation.From an economic perspective,we conducted a comparative analysis between ordinary bidirectional-flow fresh air systems and heat-recovery bidirectional-flow fresh air systems,aiming to optimize the learning environment for students.The research findings revealed that when the windows were sealed,the continuous release of CO2 by indoor occupants resulted in a peak concentration of 4,300 ppm.After opening the windows,the indoor CO2 concentration stabilized at 518 ppm,effectively falling within the safe standard range.However,when outdoor PM2.5 pollution was severe,natural ventilation led to an uneven distribution of indoor airflow velocity.Particularly in the areas adjacent to the windows where students were seated,the average PM2.5 concentration reached as high as 39 μg/m3.Therefore,it is advisable to prioritize natural ventilation for air exchange when conditions permit,as this can reduce energy consumption.When the outdoor air quality is poor,fresh air systems should be employed.Although the initial investment for a total heat recovery fresh air system is relatively high,its subsequent operational costs are low,demonstrating significant energy-saving effects.This ensures that both CO2 and PM2.5 concentrations remain within reasonable ranges.关键词
自然通风/新风系统/Fluent模拟/室内污染/经济分析Key words
Natural Ventilation/Fresh Air System/Fluent Simulation/Indoor Pollutants/Economic Analysis分类
建筑与水利
