置换通风（DV）是一种公认的空气分配方法，可提高室内空气质量，同时由于分层、较高的送风温度和自由冷却的机会，具有节能潜力。局部不适，如拔模或头踝温差过大是DV的常见症状。为了理解和预防局部不适，需要对DV喷射器中的空气速度和温度进行全面评估。在本实验研究中，在三个垂直平面上测量了壁装DV空气扩散器产生的空气速度场和温度场。在地板上方0.02 m至0.26 m（0.8 in至10.2 in）的高度，通过扩散器中心的垂直纵向平面图，以及在2处的垂直横向平面图上进行测量。 距离扩散器16米（8.5英尺），且位于地面上方0.05米（2英寸）处的水平面内。使用的供气温度比室温低5摄氏度，代表寒冷气候下可能使用的供气条件。研究发现，DV射流中的空气速度随与扩散器的距离、与中心轴的距离以及射流内部的高度而显著变化。发现射流中的空气温度随距离扩散器的距离而显著变化，随距离中心轴的距离或高度而变化的程度较小。使用垂直空气温差作为局部不适的指标，我们发现整个次级区域的室内条件都是舒适的。引用:ASHRAE会议论文，蒙特利尔，QC

Displacement Ventilation (DV) is an air distribution method recognized to enhance indoor air quality, while having a potential for energy savings due to stratification, higher supply air temperature and opportunity of free cooling. Local discomfort such as draft or excessive temperature difference between head and ankle are common complaints associated with DV. In order to understand and prevent the local discomfort, complete assessment of the air velocity and temperature in the DV jet is required. In this experimental study, the air velocity and temperature fields produced by a wall-mounted DV air diffuser are measured in three perpendicular planes. Measurements are performed at heights of 0.02 m to 0.26 m (0.8 in to 10.2 in) above the floor, in the vertical longitudinal plan through the center of the diffuser, in the vertical transversal plan at 2.16 m (8.5 ft) from the diffuser, and in the horizontal plane at 0.05 m (2 in) above the floor. The supplied air temperature used, five degrees Celsius lower than the room temperature, is representative of supply conditions likely to be used in cold climates. The air velocity in the DV jet was found to vary significantly with the distance from the diffuser, with the distance from the central axis, and with the height inside the jet. The air temperature in the jet was found to vary significantly with the distance from the diffuser, and to a lesser extent with the distance from the central axis or with the height. Using vertical air temperature difference as an indicator of local discomfort, we found that indoor conditions are comfortable throughout the secondary zone.