Method of venting smoke from highrise residential buildings

F - Mech Eng,Light,Heat,Weapons – 24 – F

Patent

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Details

F24F 7/06 (2006.01)

Patent

CA 2194200

In highrise residential buildings, venting to remove smoke from corridors is required in case of fire. In prior art systems, separate supply and exhaust shafts are provided and connected to each floor's corridor through motor-controlled damper. A disadvantage of the prior art system is that it thus requires two motorised dampers per floor and an expensive control system and wiring. The invention provides a method of venting smoke from a multi-floor building by providing a single supply and exhaust venting shaft communicating with each floor, with an air supply and exhaust grille opening into each corridor and communicating with the venting shaft; providing a supply source of pressurized air, and an exhaust source of reduced pressure each communicating with the venting shaft, and damper means for selectively closing or opening the communication of the supply source of pressurized air and exhaust source of reduced pressure to the venting shaft. Under normal conditions where pressure is desired in the corridors, the supply source is operating and the communication of the supply source is open to the venting shaft and the exhaust source communication to the venting shaft is closed. In case of a fire where venting of smoke or air is desired in at least one of the corridors is desired, the exhaust source is activated and communication of the exhaust source to the venting shaft is opened and supply source communication to the venting shaft is closed.

La présente invention permet d'éliminer la fumée dans les corridors des bâtiments d'habitation de grande hauteur, en cas d'incendie. Les systèmes antérieurs comprenaient des conduits séparés pour l'alimentation en air et pour l'extraction d'air, conduits qui étaient reliés au corridor de chaque étage au moyen de registres motorisés. Ces anciens systèmes avaient un désavantage : ils nécessitaient deux registres motorisés par étage, ainsi que du câblage et un système de contrôle coûteux. L'invention consiste en un système de désenfumage d'un immeuble de plusieurs étages comportant : un conduit unique de ventilation et d'extraction qui communique avec chaque étage et qui comprend, dans chaque corridor, une gille de soufflage et d'extraction de l'air; un mécanisme de pressurisation de l'air et un mécanisme d'extraction basse pression reliés au conduit de ventilation; un registre qui permet de mettre ou de ne pas mettre le mécanisme de pressurisation ou le mécanisme d'extraction basse pression en communication avec le conduit de ventilation. Dans des conditions normales, où les corridors doivent être en surpression, le mécanisme de pressurisation est en communication avec le conduit de ventilation, alors que le mécanisme d'extraction basse pression ne l'est pas. En cas d'incendie, où l'on veut désenfumer au moins un corridor, le mécanisme d'extraction basse pression est en marche et en communication avec le conduit de ventilation, alors que le mécanisme de pressurisation ne l'est pas.

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