Optimization And Simulation Of Y-type Dovetail Shunt Tees For Ventilation And Air Conditioning Duct

At present,China’s building energy consumption accounts for about 25% of the total energy consumption of the whole society,among which ventilation and air conditioning energy consumption accounts for more than 60% of the building energy consumption.Reducing energy consumption of ventilation and air conditioning system is very important to achieve the carbon reduction goal of building system.In this paper,the drag reduction method of ventilation and air conditioning duct is studied.Tee pipe component are analyzed in this paper,velocity field and pressure field distribution in the various typical duct size and velocity ratio of Y type shunt tee component on the drag reduction research,analyzes the different Angle and position of arc deflector,Fen Liu Xing deflector drag reduction effect of different lengths,put forward to reduce ventilation duct deflector design method of resistance.The research methods used in this paper include theoretical analysis,experimental testing and numerical simulation.Through theoretical analysis,the factors that can affect the local resistance coefficient of the tee are obtained.Through experiments,the velocity,pressure and resistance characteristics of the Y-shaped shunt tee under different flow rate ratios are analyzed.The influence of different guide vane forms,different guide vane installation positions and radians on the resistance characteristics of Y-type diverting tees was studied by using CFD three-dimensional numerical model,and the recommended structure forms,radians and installation positions of drag reducing guide vane were obtained.The results show that:(1)if the ventilation and air conditioning pipeline is equipped with appropriate guide plate,it can play the role of stabilizing air flow organization,reducing the resistance loss in the pipeline,and achieving the purpose of reducing drag.(2)Select a typical Y-type distributary tee,and analyze the resistance characteristics of its branches with arc guide vane(guide vane radian of 30°,45°,60°),and propose that the optimal drag reduction rate can reach 23.49% when the flow rate ratio is 0.5.(3)The drag-reducing characteristics of the curved guide vane are analyzed for each typical size Y-type divergent tee commonly used in practical engineering,and the parameter recommendation table,such as installation position and radian of the guide vane,is given.It provides a theoretical basis for the design and installation of ventilation and air conditioning pipes.