SYSTEMS TO PRODUCE AIRCRAFT CABIN SUPPLY AIR

Systems to produce cabin supply air for aircraft (100) and related methods are described herein. An example system includes an air conditioning pack (201) including a heat exchanger (205) including a first flow path (208) and a second flow path (211) isolated from the first flow path (208). The second flow path (211) is to receive cabin exhaust air from a cabin (108) of an aircraft (100). The cabin exhaust air is to reduce a temperature of the cabin supply air flowing through the first flow path (208) of the heat exchanger (205). The system also includes a turbine (221) to receive the cabin supply air from the heat exchanger (205). The turbine (221) is to reduce a temperature and pressure of the cabin supply air. A turbine outlet (223) of the turbine (221) is fluidly coupled to the cabin (108) to provide the cabin supply air to the cabin (108). The system further includes a fan (214) to direct the cabin exhaust air from the heat exchanger (205).