室内气流组织和空气品质的数值分析

根据Fanger热舒适方程,分析了影响人体热舒适的因素;根据通风效率、能量利用效率,分析了室内气流分布.将夏季、冬季的机械通风方式分成4种,利用计算流体动力学(CFD)对室内气流进行模拟,模拟室内气流的速度、温度、CO2浓度分布,并应用模拟结果分析不同气流组织形式下的空气品质、人体热舒适及空调能耗情况,指出不同的气流组织形式与空气环境、能耗有着密切的关系;且冷风工况与热风工况的气流分布不同,送冷风的置换通风方式与送热风的上送下回方式能获得良好的室内空气品质和有效的能源利用.

Numerical Analysis of Indoor Air Distribution and Quality

The factors affecting human body thermal comfort were analyzed according to the Fanger's comfort equation.The indoor air distributions were evaluated by the ventilated effciency and the thermal utilization coefficient.As an example,the indoor air flow field,air temperature field,and the pollutant CO2 concentration distribution were simulated by means of the computational fluid dynamics(CFD) software FLUNENT under boundary conditions of summer and winter weather conditions and four mechanical ventilated modes,and the indoor air quality,the human body thermal comfort and the air conditioning energy consumption under different conditions were evaluated by the simulation results,which show the relationship of the air distribution with the air ventilation pattern and energy consumption.It has been found that the air distribution system for heating operation differs from that for cooling,and that the displacement ventilation for cooling and the down flow for heating performs better than others in terms of indoor air quality and energy use.