Abstract: In an aircraft air-conditioning system and corresponding aircraft, ambient air is cooled by a cooling system having a first cooling circuit and a second cooling circuit thermally coupled to one another via a common heat exchanger. An ambient air inlet receives an unpressurised ambient air. The cooling system cools a refrigerant. An ambient air heat exchanger cools the ambient air. The first cooling circuit cools a first refrigerant. The second cooling circuit cools a second refrigerant. The common heat exchanger thermally couples the first and second refrigerant.

Abstract: An air-conditioning system for an aircraft includes a compressed air branch for conveying externally supplied and pressurized air, preferably bleed air. Furthermore, a cooling circuit for conveying preferably liquid refrigerant is provided and extends through a ram air duct. The system also includes a first heat exchanger for the heat transfer between the compressed air branch and the cooling circuit, a compressed air turbine arranged in the compressed air branch and a cooling circuit compressor arranged in the cooling circuit and mechanically coupled to the compressed air turbine. The system can have a modular design and be positioned at optimal locations in the aircraft due to the separation of the compressed air branch and the cooling circuit. In this way, the length of hot compressed air ducts can be shortened.