壁挂式空调非定常送风模式的数值模拟

Numerical simulation of unsteady air supply mode for wall-mounted air conditioning

为研究壁挂式空调的非定常送风对室内热舒适性的影响,以某小型多人办公室为研究对象进行送风射流流动的数值模拟研究。针对送风模式,考虑了定常流水平送风、方波水平送风、三角波水平送风和正弦波脉动+扫掠送风4种模式,并对比了人员活动区域的温度及风速的均匀性与降温速率,以及冷气射流的空间分布规律。结果表明:采用方波和三角波的非定常水平送风模式与定常水平送风模式相比,可在人员区域形成更均匀的温度场和更低的平均风速,从而改善热舒适性。但是三角波和正弦波送风会导致冷气在出风口堆积,甚至吸入回风口,导致整体降温速率降低。

In order to investigate the effect of unsteady air supply mode of wall-mounted air conditioning on the indoor thermal comfort,numerical simulations of air supply jet flow in a small office room are carried out.The influence of four air supply modes including steady horizontal supply,square wave horizontal supply,triangular wave horizontal supply and sinusoidal wave sweeping supply on the temperature uniformity,velocity uniformity,temperature decrease rate in people region and the spatial distribution of the cold jet flow are investigated,and compared results between different modes.The results show that compared with the steady horizontal supply mode,and the square or triangular wave mode leads to more uniform temperature field,lower averaged velocity and thus improved thermal comfort.However,the triangular wave and sinusoidal wave modes lead to the accumulation of cold air near the air supply grille,or even backflow into the return grlle,resulting in a lower cooling rate of the room.