Numerical Simulation Of Airflow Organization Mode In Large Space

The large space buildings have large air conditioning load and high energy consumption.The unreasonable air flow organization will cause great energy waste.In this paper,a large workshop was taken as an example,and CFD numerical simulation method is used to study various air distri bution modes in high and large space,so as to get energy saving and uniform flow distribution.Firstly,the Airpak software is used to simulate the original air distribution mode of the industrial workshop.The original design was displacement ventilation combined with the top fan coil air supply.It is found that there are some problems such as the larger design cooling load and the lower summer temperature in the working area and the serious blowing sensation in some areas.Even more,improved it by the stratified air conditioning mode,and the improved airflow are simulated,the results show that: with the improved displacement ventilation,it can save energy by 51% in summer and 33% in winter,and air distribution was more uniform,which both meet the thermal comfort and realize energy saving.Then,this paper also introduced three kinds of stratified air conditioning,the first one is including impacting jet,the second one is blowing-in middle and return-in lower,the last one is blowing-in lower and return-in middle.The design calculation and numerical simulation are carried out,and a comprehensive analysis and comparison with the modified displacement ventilation method is carried out.The results show that the impinging jet mode is an ideal air distribution mode in the whole year.Finally,the impinging jet was studied,put forward the outlet of a new type of structure,which is provided with a conical outlet baffle,and the air flow velocity,temperature and other parameters of the numerical simulation results show that the supply air with a tapered baffle plate can not only to increase the supply range,but also help the air well spread,and does not increase the draft feeling,the new outlet is provided with a conical baffle has a certain application value.