Study On Thermal Environment Simulation Of Atrium Connected Areas In Shopping Mall Building

Nowadays,with the blooming development of market economy,large shopping mall buildings are emerging.The atrium,as a popular public space in shopping mall buildings,is widely used in the design of shopping mall buildings.Due to the existence of the atrium,the hot airflow moves upward under the effect of the chimney effect in winter heating conditions and the cold air intrusion in the ground floor envelope,leading to the phenomenon of temperature stratification in the vertical direction of the atrium type shopping mall building.The uneven temperature distribution in the building makes the thermal comfort of people in the connected area poor.Therefore,it is of great significance to study the thermal environment of the atrium connected area of the mall building to improve the thermal comfort of the personnel in the mall building.In this thesis,the thermal environment of an atrium mall building in Jinan City is studied by software simulation in its atrium connected area.Firstly,the numerical simulation theory is briefly introduced in the thesis.After that,the thermal environment problems and influencing factors of atrium buildings under winter heating conditions are analyzed,and physical and mathematical models of indoor heat transfer and airflow organization are established.Fluent software is used to simulate the thermal environment in the atrium connection area of the shopping mall building,and to propose solutions to the thermal environment problems in the building,to simulate the indoor temperature distribution and velocity distribution under different working conditions,and finally to analyze and compare the simulation results.In this thesis,we first simulate the initial conditions of a shopping mall building(no thermal air curtain,only air conditioning equipment for heating and atrium air supply in both winter and summer),and then propose several improvement measures for this building from the perspectives of reducing the influence of cold air intrusion and reducing the vertical temperature difference inside.The indoor temperature and velocity fields under the improvement measures are simulated,and the indoor thermal environment under the initial condition of the shopping mall building,the condition with thermal air curtain at the exterior door,the condition with no side air supply to the atrium in winter,the condition with non-uniform air supply,the condition with adjusted heat supply to each floor,the condition with exhaust air at the upper part of the building,and the condition with radiant floor heating at the ground floor are analyzed and compared.The results show that:1.The installation of hot air curtain at the outer door of the ground floor can effectively improve the phenomenon of lower temperature on the ground floor caused by cold air intrusion,and at the same time,the side air supply to the atrium can be eliminated in winter heating conditions.2.In the case of using only air-conditioning equipment for heating in winter,the use of non-uniform air supply and adjusting the heat supply of each floor can improve the overheating of the top of the atrium type building,among which the temperature of the top floor decreases most obviously under the condition of adjusting the heat supply of each floor,and the indoor thermal environment is optimized most effectively.3.In the case of adopting radiant floor heating in the ground floor,the temperature gradient in the vertical direction in the building is reduced and the temperature distribution is more uniform,while the situation of higher temperature in the upper space of the building is significantly improved by adjusting the heat supply of other layers.