All electric environmental control system for advanced transport aircraft

摘要

The invention is an all electric environmental control system. The primary power for the system is provided in a first embodiment by a compressor (C.sub.1) driven by an electric motor (14). The system includes the primary heat exchanger (16), an expansion cooling system (20) , and a water separator (26). The electric motor (14) may be utilized in another embodiment to drive a compressor (23) within the expansion cooling system (20'). A vapor-cycle cooling system including the freon- compressor (34), the condenser (36) and the evaporator (38) may optionally replace the expansion cooling system (20). To compensate for pressure variations during flight, the electric motor (32) is mounted to a planetary gearbox (44) with a "makeup"/"subtract" differential electric motor (42) such that the compressor (C.sub.1) is run at the desired speed. The compressor (C.sub.1) is provided with inlet guide vanes (56) which are controlled by the flow meter (52) and flow logic circuit (54) to provide the desired flow rate of air to the environmental control system.