Aircraft including an air conditioning system

1. An aircraft including:

an air conditioning system feeding conditioned air to at least one zone of said aircraft via distribution means, a zone in which the conditioned air can escape outside said aircraft through an exhaust duct;

means able to recover, when said aircraft is flying at altitude, the energy of the release of said conditioned air when the latter passes from said conditioned zone to outside the aircraft;

a switching valve, the sole inlet of which is positioned in said conditioned zone and of which a first and a second outlets are respectively linked to said exhaust duct and to said energy recovery means, said switching valve being:

in its position linking its inlet to said energy recovery means when said aircraft is in cruising flight phase or in a flight phase close to cruising, and

in its position linking its inlet to said exhaust duct, in all other possible situations of said aircraft,

an auxiliary air conditioning unit partly fed with energy by said energy recovery means and able to take fresh air from outside said aircraft and generate conditioned air from said fresh air; and

switching means making it possible to feed said distribution means:

with conditioned air originating from said auxiliary conditioning unit, when said aircraft is in cruising phase or in a flight phase close to cruising, and

with conditioned air originating from said air conditioning system in all other possible situations of said aircraft.

2. The aircraft as claimed in claim 1 , provided with at least one turboshaft engine and an air conditioning system comprising:

means of taking hot air from said turboshaft engine;

means of converting said duly taken hot air into conditioned air; and

means making it possible to interrupt the taking of hot air from the turboshaft engine by said hot air taking means when said conditioned air distribution means are fed by said auxiliary unit.

3. An aircraft comprising:

an air conditioning system feeding conditioned air to at least one zone of said aircraft, a zone in which the conditioned air can escape outside said aircraft through an exhaust duct;

means able to recover, when said aircraft is flying at altitude, the energy from the release of said conditioned air when the latter passes from said conditioned zone to the outside of the aircraft;

a switching valve, the sole inlet of which is positioned in said conditioned zone and of which a first and a second outlets are respectively linked to said exhaust duct and to said energy recovery means, said switching valve being:

in its position linking its inlet to said energy recovery means when said aircraft is in cruising flight phase or in a flight phase close to cruising; and

in its position linking its inlet to said exhaust duct in all other possible situations of said aircraft; and

at least one ventilated zone fed with ventilation air by means of taking fresh air from outside said aircraft and being able to let the ventilation air escape outside the aircraft,

in which:

said energy recovery means comprise a link between said second outlet of said switching valve and said ventilated zone;

control means make it possible to interrupt the taking of fresh air by said fresh air taking means; and

said ventilated zone is fed:

with conditioned air via said link when said aircraft is in cruising phase or in a flight phase close to cruising, the taking of fresh air then being interrupted by said control means; and

with fresh air originating from said taking means, in all other possible situations of said aircraft, said link then being interrupted by said switching valve.