The Optimization Research And Application Of Stratified Air Conditioning In A Stadium

Since the development of architectural design idea, modern large space public buildings become more, which havestrange shape and large size. Stratified air conditioning technology was brought into being inthis context, andis widely used because of its unique advantages.However, different airflow distribution of stratified air conditioning has different effect and economy. Therefore, for differentnature and use function of large space buildings,it is needed to design different air supply mode according to the air distribution influencing factors.Through a large number of relevant literature retrieval, the paper summarizes the characteristics and air conditioning design elements of the existing gymnasium, and on this basis,review stratified air conditioning air distribution, influencing factors and evaluation.In this paper, the numerical simulation for 45%occupancy and100%occupancyin the design condition is carried out at first, and the design parameters are as follows: air diffuser height is 17.8m, temperature difference is 8℃, speed is 6.5m/s, the angle is 0o, cold is 131.277 KJ/s. Simulation results show that although the air cooling capacity meet the design requirements, but due to the large degree of curvature of the jet, the higher the occupancy, the lower the average audience comfort, and lower exhaust temperatures with poor economy. Then, under the premise of the transformation of the lowest cost, in order to reduce cooling load and improve the comfort and economy, it should reduce the supply air temperature and increases air velocity in theory.Then using numerical simulation to analyze the effect of air supply height and angle on air flow organization, and the optimization scheme is determined finally and compared with the original scheme.The optimization scheme noted that: air height is 17 m, speed is 8m/ s, downward angle is 10o, temperature differenceis 6 ℃at 45% occupancy and 7 ℃ at 100% occupancy.Simulation results indicate that, under the new scheme, despite an increase in the amount of air, but the supply air temperature and air cooling capacity per unit time are reduced, which saves air conditioning energy consumption. On the other hand, due to the degree of jet bending is reduced, the temperature and speed distribution of the head of the audience is more uniform and reasonable, and the average comfort is improved.In this paper, the CFD numerical simulation technology was used to optimize the stratified air conditioning system in a gymnasium. The effects of air supply height, temperature difference, velocity and angle on the air distribution were analyzed. The combination of comfort and economy is analyzed, which provides a reference for the design of stratified air conditioning and energy saving optimization.