Numerical Simulation And Research On Air Distribution Of Air Conditioning In Large Atrium

The forecast of tall space air distribution and air-condition effects of different schemes were always difficult problems that puzzle engineering staff. With the rapid development of computer technology and computational fluid dynamics (CFD, Computational Fluid Dynamics), it becomes possible to use CFD technology to simulate and predict tall space air distribution and thermal comfort, as well as to optimize the design. I studied tall space air distribution and thermal comfort which based on CFD technology. We hope the study result may provide certain reference value for air conditioning design in the practical engineering.The tall atrium of a large public building in Jinan was taken as the research object, in this paper. Stratified air conditioning calculation model was established according to actual size of the building and air conditioning design parameters. I studied the three-dimensional numerical simulation of the air distribution and thermal comfort under the stratified air conditioning design, which based on the application of FLUENT software. Then I analyze the simulation results. Two equation turbulence model and SIMPLE algorithm is used in simulated calculation. The method of Wall functions was used to consider boundary conditions in the areas close to the boundary.Projects of stratified air conditioning are different in winter and summer. Air distribution characteristics were analyzed in detail. Temperature, field velocity profile and distribution of PPD-PMV value of different projects were discussed and analyzed. What influence did air supply angle, air supply way, and the presence of floor heating exercise on indoor thermal environment were discussed under winter condition. By choosing a classic experiment chamber to do simulation, the simulation results comparing with the experimental results, verifies the correctness and reliability of CFD method.The results showed that:1. The collocation type of air conditioning outlets had small effect on the tall atrium air distribution under summer conditions. Both sides of the supply and intermediate air supply can realize the stratified air conditioning effect. Intermediate air supply is better than both sides of air supply.2. Air-supply points had remarkable effect on air distribution, under winter conditions. The most appropriate air blowing angle was20°～30°in both sides of the supply. The air blowing angle should be20°in intermediate air supply. Air supply way also had effect on air distribution of stratified air conditioning. Intermediate air supply is better than both sides of air supply when the air blowing angle is20°Presence of floor heating also had remarkable effect on air distribution of stratified air conditioning. The results showed that in-floor heating could reduce the vertical temperature gradient in the atrium, whatever the air supply way is.3. We compared the simulation results and experimental results. The results showed that CFD research methods were reliable and feasible in simulating the air distribution of stratified air conditioning.