传统混合通风的气流组织方式是：送风口安装在吊顶上，以较高的风速把气流送

传统混合通风的气流组织方式是：送风口安装在吊顶上，以较高的风速把气流送入室内。由于强烈的卷吸作用，室内空气会被卷吸进入送风气流中，随着送风气流的卷吸扩散，风速和温差会很快衰减。在理想状态下，送风气流与室内空气混合得很均匀，不考虑风口临近区域，可认为室内温度和污染物浓度基本相同。混合通风的缺点是室内风速不能任意的小，它随风量和冷负荷的增加而增加。
为了满足人们对使用空间内最佳热舒适性和优秀空气品质的要求，必须作好室内气流组织。一般来说，相对于空调房间的混合通风方式而言，置换通风可以保证良好的室内空气品质而且节能。置换通风以较低的温度从地板附近把空气送入室内，风速的平均值及紊流度均是比较小，由于送风层的温度较低，密度较大，故会沿着整个地板面蔓延开来。从地板或墙壁底部送风口所送冷风在地板表面上扩散开来，可形成"空气湖"；并且在热源周围形成浮力尾流,慢慢带走热量。由于风速较低，气流组织紊动平缓，没有大的涡流，因而室内工作区空气温度在水平方向上比较一致，而在垂直方向上分层，层高越大，这种现象越明显，所以可以创造出良好的热舒适环境。由热源产生向上的尾流不仅可以带走热负荷，也将污浊的空气从工作区带到室内上方，由设在顶部的排风口排出。底部风口送出的空气，吸收余热及污染物同时在浮力及气流组织的惯性驱动力作用下向上运动到排风口，所以置换通风能在室内工作区提供良好的空气品质。

結果 (中文) 3:

The air flow organization in the traditional mixed ventilation is that the air outlet is installed on the ceiling and the air stream is sent to the indoor air by the high wind speed.. Due to the strong entrainment, indoor air is sucked into the air supply, and with the suction and diffusion of the air supply air, the wind speed and temperature difference can be quickly attenuated.. In the ideal condition, the air supply air mixed with the indoor air is very uniform, and the air outlet is not considered, but the indoor temperature and pollutant concentration are basically the same.. The disadvantage of the hybrid ventilation is that the wind speed can not be arbitrarily small, and it increases with the increase of wind quantity and cold load..
In order to meet the need of the best thermal comfort and good air quality in the space, indoor air flow organization is required.. Generally speaking, the replacement ventilation can ensure the good indoor air quality and energy saving compared with the air conditioning room ventilation way.. Displacement ventilation to lower temperature from the floor near the air into the interior, the wind speed of the mean and turbulence intensity are relatively small, due to the low temperature of the air layer density is bigger, so it will along the surface of the whole floor spread. From the bottom of the floor or wall to send air to the air cooling spread on the floor surface, can form air lake ";And in the heat source to form a buoyant wake, slowly away heat. Due to the low wind speed, turbulent airflow moving gently, no large eddy current and indoor air temperature in the horizontal direction is consistent, and stratified in the vertical direction, layer height, this phenomenon more obvious, so you can create good thermal comfort environment. By the heat source generated to wake can not only take away the heat load, will also be polluted air from the work area to indoor above, located at the top of the exhaust outlet. Air of bottom outlet,Absorb waste heat and pollutants at the same time in the buoyancy and air flow organization of the inertia of the driving force to move up to the exhaust outlet, so displacement ventilation can provide good air quality in the indoor workspace.