Patent ID: 7467524

Claim:
An air-conditioning system, in particular an air-conditioning system for the air-conditioning of a passenger cabin of an airplane, having at least one heat exchanger arranged in a stagnation air passage, having at least one shaft device in communication with the heat exchanger at the compressed air side with at least one compressor acted on by stagnation air or environmental air at the inlet side and at least one turbine, having at least one motor for the driving of the compressor, having a turbine by-pass line for the bypassing of the turbine at the compressed air side and having at least one control device by means of which the air-conditioning system can be operated in a first operating mode in which the compressed air is expanded in the turbine and can be operated in a second operating mode in which the compressed air is guided predominantly or completely through the turbine bypass line, with the control device being in communication with the motor and being made such that the motor is operated in the first operating mode such that the motor power is used for cooling purposes and for pressurization and is operated in the second operating mode such that the motor power is used for the compression of the stagnation air or environmental air, said air conditioning system having at least one measuring device for measuring the throughflow of air from the heat exchanger.