Small Space Displacement Ventilation And Air Conditioning System, Indoor Air Quality

In the late 70s of 20 century,a completely new ventilation way—Displacement ventilation occured early in northern Europe. As an way of ventilation which can apply high air quality ,econmize energy and get higher ventilation efficiency, displacement ventilation was widely used in developped country quickly.But research on it in our country is still quite limited especially in small room.Research on the indoor air quality of displacement ventilation in small room is very practical significant.In this thesis, based on experiment model, by the way of the Fluent software the physical model and maths model of single-polluting heat source and multi-polluting heat sources in small room are established.Changes of in-air velocity,in- air temperature, positions and surface temperature of inner heat sources are simulated and researched.The simulation results of the program are figured by the tecplot9.0 software.By the analysis of the field of temperature and velocity it elicits the value of the displacement ventilation.It simulated the temperature field of displacement ventilation in winter and elicts that ventilation dosen't adapt to ventilation in winter.This thesis also simulated the single-polluting heat source concentration of CO₂.Numerical calculating results approximately coincide with experimental data which means computer models,boundary conditions and calculating results in numerical simulation is reliable,which can apply in realize.The displacement ventilation has wide application future with calculating the parameters of the supply air and the compare of energy with mixing ventilation.