Air conditioning system for a passenger aircraft

Abstract

An air conditioning system for a pressurized aircraft body includes an air flow closed loop into which fresh air may be introduced either through a fresh air treatment unit or through a trim valve or through both. A first series connection of system components includes a fresh air intake (FA), a closed loop controlled volume flow control valve (FCV) (11, 11.1, 11.2), an air-conditioner (8, 8.1, 8.2), an air mixer (9), and the space (10) to be air-conditioned interconnected by air ducts. A cabin pressure closed loop control (1) controls the air volume through the (FCV) valve. The air-conditioner unit (8) is controlled by an air conditioning closed loop control (2). A second series connection includes a filter (7), a blower (6), and a heat exchanger (4) and preferably a CO.sub.2 adsorber (5) series connected between the blower (6) and the heat exchanger (4). This second series connection forms a recycling circuit flow connected in parallel to the air mixer (9) and to the space (10). The air mixer (9) receives recirculated air from the second series connection and fresh air from the air-conditioner (8). The blower (6) and the heat exchanger (4) are controlled by a cabin zone closed loop control (3) which receives sensor information for the closed loop control. A trim air duct (12A) with a respective trim air valve (12) also controlled in closed loop fashion, is connected to by-pass the first series connection except the space (10) so that trim air can be added to the recycling air just upstream of the space (10). Up to 85% vol. % of cabin air is recycled which minimizes the use of fresh air, for a reduction of the fuel consumption.

Dependencies are inferred from the claim text.