与传统的高架混合系统相比，置换通风等分层通风系统可以提供更好的室内空气质量，提高通风效率。在置换通风系统的情况下，较高的送风温度与较低的送风速率相结合也可以提供较高的能源效率。然而，置换式扩散器的尺寸和位置以及显热负荷的强度、位置和类型会影响置换式通风系统的性能。 本文借助计算流体力学（CFD）模拟，描述了置换通风与传统高架混合系统在冬季供暖和夏季制冷热负荷相同的医疗设施两层大堂中的比较性能。CFD结果揭示了三维气流模式，由此产生的温度分布以及每种情况下的乘员热舒适参数。引用:德克萨斯州达拉斯ASHRAE会议论文。

Stratified air ventilation systems such as displacement ventilation can provide better indoor air quality with enhance ventilation effectiveness compared to the traditional overhead mixing systems. In the case of displacement ventilation systems the higher supply air temperatures combine with the low supply airflow rates can also provide higher energy efficiency. However the size and locations of displacement diffusers as well as the strength, location, and type of the sensible heat loads can affect the performance of the displacement ventilation systems.This paper with the help of Computational Fluid Dynamics (CFD) simulations describes comparative performance of the displacement ventilation with traditional overhead mixing system for a two-story lobby of a healthcare facility with identical winter heating and summer cooling heat loads. CFD results reveal three-dimensional airflow patterns, resulting temperatures distribution along with the occupant thermal comfort parameters for each case.