Numerical Simulation Of Displacement Ventilation's Influence On Air Quality Indoor

Displacement ventilation is a new ventilation mode. Compared to traditional ventilation, it not only makes the indoor condition working area obtain a higher air quality and a thermal comfortableness, but also a higher ventilation efficiency.Displacement ventilation is a mode that supplies the air from a low part of the room by slow speed, the airflow moving slowly upward by the laminar condition that similar to piston flow. When arrived a certain height, enduring the influence of heat source and the roof, and causing turbulence phenomenon and turbulent zone, flow thermal layer phenomenon. Because displacement ventilation can solve two problem that is, energy-saving of air condition and the improvement of air quality indoor, it got more and more popular among the people..This paper established a set of complete ventilation model, structured geometry model and divided grid for the air- conditioned room with displacement ventilation, numerical simulation calculated the flow field, established a theory foundation for the next work.Adopted k -εtwo-equation turbulence model and the method of wall plane function described the flow of air-conditioning indoor, and dispersed the equation by finite volume method. Simulation calculated the fields of pressure, of speed, of temperature and the CO₂ concentration of different indoor condition. Analyzed and studied the influence that sendoff wind temperature, its speed and location of wind supply inlet have impact on air quality indoor. Achieved and conformed the thermal hierachical height of model. Compared the displacement ventilation with mixed ventilation of the same sendoff wind condition and boundary condition. It's has important reference value to evaluate the air quality indoor of displacement ventilation and guide the energy-saving of air conditioning.