随着暖通空调行业在中国的快速发展，在一些固定座椅的地方，如剧院、礼堂、体育馆等，使用了座椅通风，即在座椅下方或后面安装空气扩散器的通风。但是，似乎很难避免由于气流引起的局部热不适，因为扩散器靠近人体，因此，乘员身体周围会遇到相对较高的速度和较低的空气温度。早期研究还表明，空气在从排气口到排气口的过程中被人加热，因此座椅通风存在垂直温差，不适当的供气量或温度可能导致脚踝和头部之间的空气温差过大，从而带来不适。 在一个试验箱中进行了从椅腿供气的座椅通风试验。研究了舱内以及乘员关键部位（如脚踝、膝盖、手腕、肘部和前额）周围的温度场和速度场。比较了不同送风量下的结果。同时在实验室内对人体进行热舒适性测量。结果表明，座椅通风的温度随着高度的增加而增加。脚踝周围的温度通常低于乘员的任何其他部位。 除扩散器附近的速度外，整个腔室的速度较低，可能会超过舒适度限制。当送风量较大时，垂直无量纲温度较低，地板层的速度较高，更容易出现因气流而产生的不适感。但随着空气量的增加，踝关节和头部之间的空气温差变小。应进行更多的研究，以找到合适的供气参数，并提出新的座椅通风设计准则。单位:SICITION:研讨会，ASHRAE交易，第卷。 第108页。2.

As the HVAC industry is developing fast in China, chair ventilation, i.e., ventilation with an air diffuser mounted under or at the back of a chair, is used in some places with fixed chairs, such as theaters, auditorium, gymnasiums, and so on. But it seems difficult to avoid local thermal discomfort due to draft because the diffuser is close to the person and, thus, relatively high velocities and low air temperatures are encountered around the body of an occupant. An early study also shows that air is heated by persons on the way from the outlets to the exhaust, so vertical temperature difference exists in chair ventilation, and improper air supply volume or temperature may result in a large air temperature difference between ankle and head, which brings discomfort.Experiments on chair ventilation with air supply from chair legs are carried out in a test chamber. Temperature and velocity fields in the chamber and around the critical parts of an occupant, such as ankle, knee, wrist, elbow, and forehead, are investigated. Results with different air supply volumes are compared. Thermal comfort measurements with human subjects are carried out at the same time in the experimental chamber.Results reveal that temperature in chair ventilation increases with height. The temperature around the ankle is usually lower than any other part of an occupant. Velocities are low in the whole chamber except those near the diffusers and may exceed the limit for comfort. With larger air volume supply, the vertical dimensionless temperature is lower, the velocity is higher at the floor level, and an nwanted local discomfort due to draft is more ready to happen. But air temperature difference between ankle and head is smaller with larger air volume. More studies should be carried out to find the adequate air supply parameters and bring forward new design guidelines on chair ventilation.Units: SI