The Underground Garage Without Duct Induced Ventilation System Optimization And Numerical Simulation

Compared with the traditional duct ventilation system,the no duct inductive ventilation system has the characteristics of high efficiency, energy saving, space saving and convenient adjustment, so it has been widely used, but the design method and the effect of ventilation are lack of mature theoretical support. So in this article, we do experiments todetermine the corresponding mathematical model and boundary conditions, and useCFD to simulate theventilationsystem concentration field, temperature field and velocity field.At first,we do experiments in this paper, different from normal direction along the center of the induced fan nozzle arrangement of multiple section, to test and record the actual wind speed, and then we numerically simulate the wind speed, we multiple sets of simulation value and experiment value contrast, when the experimental value is consistent with the simulation values, the mathematical model and boundary condition is accord with the actual situation of the paper, then we put a induced fan in a small space model to explore studied reasonable arrangement parameters, we eventually take 9 m longitudinal spacing, the horizontal spacing eventually takes 5 m, nozzle under takes 15 ° inclination, on both sides of the nozzle and the center of the nozzle Angles30 °.On this basis, according to an international building underground garage on the second floor of the induction ventilation system, traditional duct ventilation system was simulated, the comparison of two different systems breathing layer height of temperature field, velocity field and concentration field, at the same time, the two systems are compared with the situation when the induced fan is closed, embodies the induced fan good dilution effect. Finally, the technical economical comparison analysis of ventilation system for underground garage, the analysis results show that the garage no duct induced ventilation system of technical economy is better than the traditional air duct ventilation system.The innovative point of the paper is mainly the following:We numerically simulatethe underground garage of the pollutants concentration field, velocity field, the temperature field.we determine the induced fan nozzle Angle between both sides of the nozzle and the center.