Pneumatic cabin super charger

An aircraft air conditioning system comprising:

• a primary propulsion turbine engine having a bleed valve providing pressurized air;
• a ram air inlet providing ram air;
• a super charger including a spool with at least one turbine mounted thereon and driven by said pressurized air, and at least one compressor connected to said at least one turbine receiving said ram air and producing compressed air with the number of at least one turbine and at least one compressor totaling at least three;
• and
• an air conditioning pack receiving said compressed air and producing refrigerated air and distributing said refrigerated air throughout the aircraft.

A method of providing an air conditioning system super charger comprising the steps of:

• a) supplying pressurized air from a primary propulsion turbine engine;
• b) providing a super charger having a number of turbines driven by a portion of the pressurized air with the number of turbines having a first specific speed;
• c) providing the super charger with a number of compressors driven by the turbines and having a second specific speed matched to the first specific speed;
• d) generating compressed air from the number of compressors;
• e) supplying the compressed air to an air conditioning pack;
• and
• f) reducing the portion of pressurized air needed to drive the super charger with the number of turbines and compressors.