In a first embodiment of {HEAD ~ the present invention}, the compressor unit, the first chamber of {TAIL ~ the heat exchanger} and the turbine are arranged in series in the direction of flow of the air in a known manner known to form the first air circuit 
In a first embodiment of { HEAD ~ the present invention } , the compressor unit , the first chamber of { TAIL ~ the heat exchanger } and the turbine are arranged in series in the direction of flow of the air in a known manner known to form the first air circuit
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