Comparison of aerodynamic characteristics for various slot diffusers

The airflow in the room or any space has a significant impact on the proper operation of the entire ventilation system. An appropriate field of air velocity flowing through the entire room allows for climate comfort. That is why it is so important proper selection as well as proper arrangement for the air-supply and air-exhaust elements in the ventilation system. This research study presents an isothermal air stream flowing from two different slot diffusers. The supply airstream was analysed at various volumetric flow rates and the velocity of the supply air stream was measured in accordance with the PN-EN 12238: 2002 standard. In order to evaluate the optimal measuring points and to create an appropriate grid, before starting the experimental measurement smoke tests were carried out which determine the scope and shape of the supply stream. All experimental measurements were performed up-to the location where the supply air stream reaches the limiting speed of 0.2 m/s. As a result of the analysis, the obtained characteristics of two types of slot diffusers were discussed and compared.