HYDROGEN SYSTEMS FOR ENVIRONMENTAL CONTROL SYSTEMS ONBOARD AIRCRAFT

Aircraft systems including a pressurized fuel tank (402) containing a pressurized fuel, a turbo expander (414) configured to receive the pressurized fuel from the fuel tank, the turbo expander configured to decrease a pressure of the pressurized fuel to generate low pressure fuel having pressure less than the pressurized fuel, a fuelto-air heat exchanger (410) configured to receive the low pressure fuel from the turbo expander as a first working fluid and air as a second working fluid, the heat exchanger configured to cool the air and warm the fuel, an aircraft cabin configured to receive the cooled air, and a fuel consumption system (410) configured to consume the fuel to generate power.