Aircraft air conditioning system comprising a separate refrigeration cycle

摘要

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.

主权项

1. An air-conditioning system for an aircraft, comprising:
a compressed air branch for conveying externally supplied and pressurized air; a cooling circuit for conveying refrigerant, the cooling circuit extending through a ram air duct and comprising a first cooling circuit section and a second cooling circuit section; a first heat exchanger arranged in the first cooling circuit section and a second heat exchanger arranged in the second cooling circuit section, each configured to transfer heat between the compressed air branch and the cooling circuit; a compressed air turbine arranged in the compressed air branch; a cooling circuit compressor arranged in the first cooling circuit section and mechanically coupled to the compressed air turbine; and a cooling circuit turbine arranged in the second cooling circuit section downstream of the second heat exchanger in a refrigerant flow direction; wherein the first cooling circuit section and the second cooling circuit sections are connected in parallel to one another; wherein the cooling circuit turbine, the cooling circuit compressor and the compressed air turbine are mechanically coupled to one another by a common drive shaft; and wherein an outlet of the cooling circuit turbine is connected to an inlet of the cooling circuit compressor.