Aeronautics and astronautics – Aircraft structure – Passenger or crew accommodation
Patent
1997-07-02
1999-10-19
Barefoot, Galen L.
Aeronautics and astronautics
Aircraft structure
Passenger or crew accommodation
244 58, 454 74, 454 76, 454115, 454141, B64D 1100
Patent
active
059674610
ABSTRACT:
A high efficiency environmental control system uses air exhausted from a pressurized cabin to cool compressed air entering the cabin. Air exhausted from the cabin may flow directly from the cabin through a heat exchanger which cools the compressed air entering the cabin. Alternatively, air exiting the cabin may flow through a turbine which expands and cools the air prior to passing through the heat exchanger. The turbine may be used to drive a compressor to provide the compressed air to the cabin. Supplemental power to drive the compressor may be provided by a second turbine driven by bleed air from one or more turbine engines, or by an electric motor. Bleed air may also be mixed with air from the compressor to provide fresh air to the cabin. To further increase efficiency and meet the cooling requirements of the cabin on the ground and at altitude, switch dampers may be employed to selectably vary the flow path of air supplied to the cabin.
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Barefoot Galen L.
McDonnell Douglas Corp.
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