Ceiling fans are the most common equipment in any household with electricity to induce a higher air movement since the potential of natural ventilation is limited. However, the higher airflow region is generally limited to the zone below the fan. The non-uniform distribution of airflow is also affected by the furniture layout and airflow from window openings. This study attempts to evaluate the effect of the different window-opening patterns on the airflow inside naturally ventilated bedrooms, having a ceiling fan for air movement with numerical simulations and on-site measurements. The airflow pattern created by a ceiling fan in a room with furniture is modelled and simulated with ANSYS Fluent 2019 R3. The results were validated with on-site measurements and compared with the literature. The air velocity was measured in bedrooms of three different sizes. It was observed that the opening of windows created a better distribution of air irrespective of room size. The non-uniformity of the air velocity is reduced from 76% to 39% with the opening of windows in the larger-sized room. The reduction in non-uniformity is influenced by the location of windows also. The practice of opening windows along with the induced air movement by ceiling fans results in a better distribution of air in the space.

Practical application: People tend to depend mainly on ceiling fans even if windows are open in naturally ventilated rooms. A study of patterns of non-uniform distribution of airflow can help designers to improve comfort conditions by specifying the number and location of fans and windows while designing room furniture layout. This aids the building services engineers to provide thermal comfort without always depending on alternative active ventilation strategies.

由于自然通风的潜力有限，吊扇是任何有电家庭中最常见的设备，以引起更高的空气流动。然而，较高气流区域通常限于风扇下方的区域。气流的不均匀分布还受到家具布局和窗洞气流的影响。本研究试图通过数值模拟和现场测量来评估不同开窗模式对自然通风卧室内气流的影响，卧室配有吊扇用于空气流动。使用 ANSYS Fluent 2019 R3 建模和模拟由吊扇在带家具的房间内产生的气流模式。结果通过现场测量进行了验证并与文献进行了比较。风速是在三种不同大小的卧室中测量的。据观察，无论房间大小如何，打开窗户都能创造更好的空气分布。随着较大房间的窗户打开，空气速度的不均匀性从 76% 减少到 39%。非均匀性的减少也受窗口位置的影响。打开窗户以及吊扇引起的空气流动的做法可以使空气在空间中更好地分布。

实际应用：即使在自然通风的房间里开窗，人们也倾向于主要依赖吊扇。对气流非均匀分布模式的研究可以帮助设计师通过在设计房间家具布局时指定风扇和窗户的数量和位置来改善舒适条件。这有助于建筑服务工程师提供热舒适度，而无需始终依赖替代的主动通风策略。