Numerical Simulation of Air Flow in Large Air Flow Box

In order to distribute air flow quickly and uniformly in an air flow box with large flow rate and high velocity for air conditioning system,a cap type diffuser is developed and manufactured,which can slow down air velocity from 40 m/s to 2.5 m/s in a distance as short as 0.4～0.6 m;then uniformly distribute air to windward side cross area of evaporator to improve the efficiency of heat exchange,cut down the possibility of frosting and enhance the energy efficiency ratio of air-conditioner.