Device for preferably cooling a room by a ventilation air stream

Claim 1

In a room air ventilating system comprising air outlet means for delivering a stream of air to a room and air supply means for supplying said stream of air to said air outlet means for passage therethrough into said room, the improvement wherein: said air outlet means comprises main aperture means positioned substantially at a wall of said room for passing the majority of said stream into said room; said system further comprises air nozzle means disposed adjacent said aperture means for delivering at least one jet of air into said room along the general direction of said majority of said stream, the cross-sectional area of the orifice of said nozzle means being small compared with the total cross-sectional area of said main aperture means and the outlet of said nozzle means to said room being positioned substantially at or slightly on the room side of said main aperture means; and said air supply means comprise a common source of air under pressure and first and second means separately connecting said main aperture means and said nozzle means respectively with said common source, said second means providing a smaller pressure drop than said first means such that the linear velocity of said at least one air jet from said nozzle means is large compared with the linear velocity of said air stream through said main aperture means while the volume rate of air flow through said nozzle means is small compared with that through said main aperture means, thereby to increase the throwing length of said stream of air into said room for any given total rate of air flow into the room.