Simulation And Analysis Of The Airflow In An Atrium-style Commercial Building

The commercial buildings with atrium glass roof due to superposition of the greenhouse effect and the chimney effect, the building was formed in the thermal environment is unique,has an important impact on Regional People's comfort at the same time, the tall building atrium space ventilation requirements led to increased energy consumption of air-conditioning, so the atrium building the airflow organization is paid more and more attention.The reference layer type air in the air flow arrangement, to reduce the energy consumption of air conditioning in atrium building, plays a positive role in improving the comfort of the building.The research object of this paper is a shopping mall in Nanjing, the mall is at the top of the courtyard style building with a glass roof, the work of this thesis are as follows: firstly,the basic theory and evaluation index of air flow organization on CFD is introduced, it paves the way for the following research; secondly, the air conditioning operation parameters on the target market the field test, the test content includes outdoor temperature, indoor temperature, air temperature, air velocity, based on field test data, and then use of the goal market was simplified numerical simulation software Airpak, based on the measured data as the boundary condition for modeling, simulation results obtained by numerical calculation,and the simulation results the field data were compared to verify the correctness of the numerical model, also shows that the CFD method of air distribution is feasible; Finally,combined with the current building air distribution and the existing problems, proposed the airflow organization arrangement to send the next walk around in the atrium area by the method of numerical simulation is used to supply air height, air temperature and air velocity conditions were simulated respectively, the air distribution under different conditions. The distribution, and then combined with the evaluation indexes of air distribution simulation and analysis results, determine the best air parameter in the airflow under the arrangement,the optimal parameters for the air height 2.2m, air temperature is 19 degrees centigrade, air velocity 1.2m/s. The flow field distribution in the mall with the original layout of the organization to send the next air flow organization under distribution were compared, results show that the air in the case of distribution within the building of the temperature field is more uniform, people more comfortable.Because the simplified model is adopted, and the complexity of the internal structure and the micro climate is not considered, the simulation results have a certain gap with reality.The purpose of this paper is to provide a kind of airflow arrangement strategy, which can be used as a reference for future design.