Ventilation System

Abstract

Ventilation system for ventilating especially classrooms ( 1 ) and similar rooms, comprising a lowered ceiling ( 3 ) and means, e.g. a ventilator ( 5 ), for forced air inlet from the outside air ( 6 ) into the room ( 2 ) above the lowered ceiling, and air outlet openings ( 7 ) mainly evenly spaced over the whole surface of the lowered ceiling. The exhaust air may be led via an HR unit ( 12 - 16 ) to preheat the supply air. Blowing the supply air along the underside of the concrete upper floor ( 4 ) enables cooling that floor at night. By day this cold may be used to cool the supply air.

1 . A method for ventilating rooms comprising:
 providing a surface structure parallel to a wall, ceiling or floor of a room;   providing forced air inlet from the outside air into the room between said surface structure and said wall, ceiling or floor;   providing air outlet openings, evenly spaced over the whole surface of said surface structure, wherein the ratio between a pitch and a diameter of said outlet openings is between 6 and 20:1.   
   
   
       2 . The method according to  claim 1  for ventilating classrooms and similar rooms, comprising:
 providing a lowered ceiling;   providing forced air inlet from the outside air into the room above the lowered ceiling;   providing air outlet openings, mainly evenly spaced over the whole surface of the lowered ceiling.   
   
   
       3 . A ventilation system for ventilating rooms like classrooms and the like, comprising a surface structure extending parallel to a wall, ceiling or floor of that room, and means for forced air inlet from the outside air into the room between said surface structure and said wall, ceiling or floor, and air outlet openings evenly spaced over the whole surface of the surface structure, wherein the ratio between a pitch and a diameter of said outlet openings is between 6 and 20:1. 
   
   
       4 . The ventilation system according to  claim 3 , wherein the surface structure comprises a lowered ceiling parallel to the ceiling. 
   
   
       5 . The ventilation system according to  claim 3 , wherein the hydraulic diameter of the outlet openings is between 0.1 and 6 cm. 
   
   
       6 . The ventilation system according to  claim 3 , wherein the means for forced air inlet from the outside air into the room between the surface structure and said wall, ceiling or floor are formed by an electrical ventilator. 
   
   
       7 . The ventilation system according to  claim 3 , comprising a first air supply channel, formed by room between, at one side, the ceiling and, at another side, an isolation plate extending parallel to the ceiling, which first air supply channel forms a connection between said means for forced air inlet and the air outlet openings in the lowered ceiling. 
   
   
       8 . The ventilation system according to any of  claim 3 , comprising a second air supply channel, formed by room between, at one side, the isolation plate and, at another side, a heat recovery plate extending parallel to the ceiling, between the second air supply channel and an air exhaust channel also extending parallel to the ceiling, which forms, via connection means connected to the room to be ventilated, a connection between the room to be ventilated and the outside air, which second air supply channel also forms a connection between said means for forced air inlet and the air outlet openings in the lowered ceiling. 
   
   
       9 . The ventilation system according to  claim 8 , comprising means for supplying at choice, either manually or by control means, the outside air via the first air supply channel and/or the second air supply channel. 
   
   
       10 . The ventilation system according to  claim 8 , provided with a filter in the first and/or the second air supply channel. 
   
   
       11 . The ventilation system according to  claim 10 , wherein the relevant filter extends over a substantial part of the length of the relevant air supply channel and either is, at an entry side of that air supply channel, attached to an upside of the air supply channel and, at an exit side of the air supply channel, attached to an underside of the air supply channel, or is, at an entry side of the air supply channel, attached to the underside of the air supply channel and, at an exit side of the air supply channel, attached to the upside of the air supply channel. 
   
   
       12 . The method according to  claim 1 , wherein the ratio between the pitch and the diameter of said outlet openings is between 10 and 16:1. 
   
   
       13 . The ventilation system according to  claim 4 , wherein the ratio between the pitch and the diameter of said outlet openings is between 10 and 16:1, preferably around 13:1.