基于方柱面贴附空气幕式送风模式气流组织特性研究

Air distribution characteristics of air curtain ventilation mode based on square column attached

提出了一种适用于大空间建筑通风空调系统的方柱面贴附空气幕式送风模式。采用数值模拟方法,研究了多柱组合送风模式下各柱体间气流组织特性的对称性,分析了送风速度、温度和热流密度3个特性参数对房间速度场和温度场分布的影响,并对工作区人员热舒适性进行了评价。研究表明,该送风模式能够在房间下部工作区形成类似于置换通风的空气湖状速度及温度分布,人员热舒适性较强,承担的室内负荷较传统置换通风模式大,而且上置送风口便于布置,是一种通风效率较高、工作区空气品质较好的气流组织形式。

Presents a novel ventilation mode based on square cohunn attached air curtain, which can be applied to HVAC system in large space buildings. Studies the symmetry characteristics of air distribution among different square columns using CFD numerical simulation. Analyses the influences of air supply velocity,temperature and heat flux density on the indoor velocity and temperature fields. Evaluates the human thermal comfort in the occupied zone. The results show that this kind of air supply mode can form air lake phenomenon on the aspect of velocity and temperature distributions, and thus achieve human thermal comfort. Meanwhile, this mode can meet higher cooling load than that of traditional displacement ventilation, and the upper located air diffuser is also easily mounted. In general, square column attached air curtain ventilation can create better air quality in occupied zone, and has higher ventilation efficiency.