Draught Comfort in a Slot-ventilated Room at various Inlet Aspect Ratios

Slot-ventilated rooms are widely used in comfort type HVAC (Heating, Ventilation, Air Conditioning) systems, where the air inlet is usually a simple slot-diffuser. The geometry of the slot is often expressed by the aspect ratio (AR), which is an important designing parameter of the room air distribution in ventilation systems. Aspect ratio of the slot-diffuser is the non-dimensional ratio of the slot's length and width. This AR value can influence room airflow characteristics, including draught comfort. Previously, the effect of inlet aspect ratio on a slot-ventilated room's draught environment was not investigated. In this article, the influence of various aspect ratios was investigated on a slot-ventilated model room's draught comfort, using Fanger's DR model. The investigations included air velocity and temperature measurements in a full-scale single (or cellular) office model room and the measured data were evaluated with statistical methods.