Displacement flow systems are becoming popular, especially in Scandinavia, for comfort ventilation. In these systems air is supplied near the floor at low velocity; the temperature of the supply air is a few degrees below that of the air in the room. The supply air is heated by persons and/or machinery in the room. Turbulent plumes are formed above these heat sources.
A test room with a Displacement Ventilation System has been built. Air velocity and temperature profiles were measured at different places in the room under summer and winter conditions. Additional numerical simulations for the same conditions as in the experiment were performed. The measured and calculated values showed good correspondence. An office room is normally not occupied permanently therefore its transient ---behaviour was also investigated.
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