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.