Environmental control system for aircraft with improved efficiency

An airconditioning control system for an aircraft cabin, the environment of which is to be controlled, including in combination;

• a rotary power supply,
• a turbomachine including a power compressor for providing compressed air secured to a power shaft, said rotary power supply drivingly coupled to said power shaft to operate at a given speed;
• an expansion cooling turbine mounted on a shaft concentric to said power shaft,
• means for directing a source of ambient air to and through a heat exchanger,
• said power compressor coupled to said cabin and through said heat exchanger to an input of the expansion cooling turbine to thereby draw air from said cabin and deliver said compressed air to said expansion cooling turbine, said expansion cooling turbine operating at a different speed than said given speed of said power shaft, and
• said expansion cooling turbine having an output coupled to said enclosure to deliver conditioned air which has been cooled to said cabin,
• a source of bleed air and control means therefore, temperature control means,
• cabin temperature sensing means controllingly connected to said bleed air control means through said temperature control means,
• said integral compressor having an output coupled to said output of said expansion cooling turbine through said bleed air control means whereby bleed air will be allowed to mix with said cooled air dependent upon the cabin temperature sensed by said sensing means.

An airconditioning control system for an enclosure, the environment of which is to be controlled, including in combination;

• a rotary power supply,
• a turbomachine including a power compressor for providing compressed air secured to a power shaft, said rotary power supply drivingly coupled to said power shaft to operate at a given speed;
• an integral compressor and an expansion cooling turbine mounted on a shaft concentric to said power shaft,
• a power driven fan, said fan directing a source of ambient air to and through a heat exchanger,
• said power compressor coupled respectively to said enclosure and an input of said concentrically mounted compressor to thereby draw air from said enclosure and deliver said compressed air to said concentrically mounted compressor,
• said concentrically mounted compressor having an output coupled to an input of said expansion turbine through said heat exchanger, said integral compressor and expansion cooling turbine operating at a speed greater than said given speed of said power shaft, and
• said expansion cooling turbine having an output coupled to said enclosure to deliver conditioned air which has been cooled to said enclosure.