关键词: 下沉广场, 地下商业建筑, 混合通风, CFD 模拟

Abstract:

In order to overcome the development limitation of large- scale underground commercial buildings(UCBs) caused by mechanical ventilation mode,three large- scale UCBs being built in Guangzhou are taken as pro-totypes to discuss the interior ventilation of UCBs affected by the location of sunken plaza as a common entranceform of UCBs,with the implementation of hybrid ventilation as a point of penetration.Then,an analytical modelwith consistency is established through abstracting the prototypes,and the velocity vector distribution of airflow inthree model states is calculated via the CFD simulation of wind environment.Moreover,the interior air change rateof the samples is analyzed,and the regional thermal environment is discussed with WeatherTool,which helps to de-termine an effective domain of natural ventilation that fulfils the temperature and humidity requirements of humanbeing.Simulated results indicate that (1) suitable sunken plaza location and appropriate relative location of sunkenplaza to atrium may improve the air speed,airflow uniformity,comfortable sensation and energy efficiency in natu-ral ventilation state; (2) the heat absorption of fundamental parts helps to obtain a suitable air speed of UCBs inGuangzhou area; and (3) in the design of large- scale UCBs,ventilation simulation is necessary and beneficial.

Key words: sunken plaza, underground commercial building, hybrid ventilation, CFD simulation