Cooling roof construction

Abstract

A cooling roof construction comprising a substantially horizontal roof having a weatherproof membrane, and where a perforated tile layer is arranged a distance above said membrane, where the space between the membrane and the perforated tile layer is connected by at least one conduit to an outside ambient space.

1 . A cooling roof construction comprising a substantially horizontal roof having a weatherproof membrane, and where a perforated tile layer is arranged a distance above said membrane, where the space between the membrane and the perforated tile layer is connected by at least one conduit to an outside ambient space outside the roof's perimeter or above the tile layer. 
     
     
         2 . The cooling roof construction according to  claim 1  wherein the perforated tile layer is assembled from a plurality of tiles, where the tiles are elevated relative to the membrane by means of risers. 
     
     
         3 . The cooling roof construction according to  claim 2  wherein the risers have different height, such that the tile layer is a slanted or horizontal surface. 
     
     
         4 . The cooling roof construction according to  claim 1  wherein the ambient space to which the conduit is connected is at a lower elevation or cooler space than the space between the membrane and the tile layer. 
     
     
         5 . The cooling roof construction according to  claim 1  wherein the tiles and/or risers are made from plastics, preferably in an injection moulding process. 
     
     
         6 . The cooling roof construction according to  claim 1  wherein temperature controlled valve means are provided near the outlet of the conduit. 
     
     
         7 . Method of cooling a building having a substantially flat roof space, where at least one perforated tile is arranged at a distance above the roof, and where cooler air by means of a conduit is guided into the space created between the roof and the perforated tile. 
     
     
         8 . Method according to  claim 7  wherein the cooler air is obtained from a lower elevation, a cellar space, a well or the like, and by natural convection transported to the space between the roof and the perforated tile, where the cooler air is heated due to the exposure to solar heating of the tile surface, where after the air escapes upwards through the perforations in the tiles creating under-pressure in the space between the roof and the tiles, thereby creating air movement.