Patent ID: 6389826
Filing Date: 2002-05-21
Classification: B64D,Y02T

Abstract:
In a passenger aircraft including a pressurized fuselage having fuselage interior air therein, at least one source of high pressure air, an air conditioning system connected to said at least one source so as to receive high pressure air therefrom, plural air conditioning zones in said fuselage connected to said air conditioning system to receive air conditioning air therefrom, and a pressure relief device arranged and adapted to exhaust some of said fuselage interior air out of said fuselage,an improvement in said air conditioning system comprising: first air conditioning means connected to at least one of said at least one source of high pressure air for receiving, cooling and expanding said high pressure air to provide first cold air having a first cold air temperature below a freezing point of water; second air conditioning means connected to at least one of said at least one source of high pressure air for receiving, cooling and expanding said high pressure air to provide second cold air having a second cold air temperature below a freezing point of water; first recirculation means for receiving some of said fuselage interior air and providing therefrom first recirculation air; second recirculation means for receiving some of said fuselage interior air and providing therefrom second recirculation air; first pre-mixing means for receiving and mixing together said first cold air and said first recirculation air to provide first pre-mixed air having a first pre-mixed air temperature above a freezing point of water; second pre-mixing means for receiving and mixing together said second cold air and said second recirculation air to provide second pre-mixed air having a second pre-mixed air temperature above a freezing point of water; air distribution mixing means for receiving and mixing together said first pre-mixed air and said second pre-mixed air to provide common pooled air; local recirculation means for receiving some of said fuselage interior air and providing therefrom local recirculation air; first local post-mixing means for receiving and mixing together some of said common pooled air and at least some of said local recirculation air, and providing therefrom first zone supply air into a first one of said air conditioning zones; and second local post-mixing means for receiving and mixing together some of said common pooled air and at least some of said local recirculation air, and providing therefrom second zone supply air into a second one of said air conditioning zones.