CFD Simulation Study Of Air Flow Of Air Conditioning In Open Atrium Building In Winter

Thermal environment of Atrium building is unique with its greenhouse effect and chimney effect.In recent year diversified air conditioning design systems in Atrium building have not been applied in China due to their complicacy. Thus, for this purpose, with the aid of Airpak2.1 produced by Fluent Company, thermal comfort and air distribution of both existing central air conditioning system and advanced floor-radiation heating adding air conditioning system in winter were simulated in Tianjin Administration Admission Center. Then the research results were compared with simulation results expecting it will be available for the actual engineering design.Firstly, the numerical model of heating system in Tianjin Administration Admission Center was set up with CFD simulation software. The data of simulation boundary condition and actual airflow distribution were measured and then the simulation results under the testing condition were compared with the measurement to validate the model. Secondary, the existing heating system with worst instance was simulated and analyzed. Thirdly, the advanced floor-radiation heating adding air conditioning system was proposed to improve thermal comport and save energy, which was simulated with CFD in the worst situation. Furthermore, the simulation results of the two different heating systems were compared. Finally, the energy consumption of the two heating systems was simulated with Energy Plus. The research works in this paper focus mainly on the following aspects:1. First and foremost, the numerical model of Administration Admission Centerthe was set up with CFD simulation software. To validate the reliability of the model, the practical test was conducted and the part of measurement data was used as numerical simulation boundary condition. The comparisons between the simulation results and measurement data indicated that this numerical model is feasible;2. Using the numerical model above, the existing heating system with worst instance was simulated by means of trial calculation. Based on this, the characteristics of indoor airflow distribution and thermal comfort in winter were analyzed under this condition in order to provide reference value for the subsequent Atrium air conditioning system design and reconstruction;3. Considering the building's unique characteristics, the advanced floor-radiation heating adding air conditioning system was proposed to improve thermal comfort and save energy and then simulated with CFD in the worst situation. On the basis of this, the characteristics of indoor airflow distribution and thermal comfort in winter were analyzed and the simulation results of both the heating system schemes were contrast and analyzed;4. The energy consumption of central air conditioning heating system and floor-radiation heating adding air conditioning heating system in Administration Admission Center was simulated with Energy Plus. The simulation results of the two different heating systems were performed and analyzed in detail. Lastly the energy consumption of the two different types of heating was compared to determine the energy-conservation design scheme.