Ram air turbine powered cabin air compressor

A pressurization system for a vehicle comprising:

• an inlet for receiving a medium;
• a cabin air compressing device arranged in fluid communication with the inlet, the cabin air compressing device comprising:
• a shaft;
• a compressor connected to the shaft, the compressor having a compressor inlet and a compressor outlet;
• a motor operably connected to the shaft and configured to drive the compressor;
• and
• a turbine connected to the shaft and also configured to drive the compressor upon receipt of the medium, the turbine having a turbine inlet and a turbine outlet;
• and
• a heat exchanger having a first inlet fluidly connected to the compressor outlet and having a second inlet fluidly connected to the turbine outlet;
• wherein the compressor inlet and the turbine inlet are fluidly connected to and are arranged in parallel relative to the inlet.