Energy-efficient all-electric ECS for aircraft

Refrigeration – Automatic control – Air compessor – cooler and expander

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62402, 62434, F28B 900

Patent

active

044346247

ABSTRACT:
The invention is an energy-efficient all-electric environmental control system (70). The system includes a cabin compressor (16) and a Freon compressor (14), both of which are commonly driven by a two-speed electric motor (12). The motor (12) operates at low speed at low altitudes and on the ground to drive the Freon compressor (14). Freon fluid then cools the electric motor (12) and the cabin (18) and avionics (56) by means of the evaporator dehumidifier systems (72) and (74), respectively. At high altitudes the electric motor (12) runs at high speed to drive the cabin compressor (16) to provide pressurization for the cabin (18). In this operation mode, the Freon compressor can be disconnected via an electromagnetic clutch (48).
The ECS (70) also includes a liquid Freon pump (52) which can be utilized when the Freon compressor is disconnected or bypassed to circulate liquid Freon to cool the electric motor (12) and to circulate through the evaporators (38) and (76). The pump (52) is driven by an ac or dc motor (54).

REFERENCES:
patent: 2451280 (1948-10-01), Del Mar
patent: 2452704 (1948-11-01), Wahlmark
patent: 2585570 (1952-02-01), Messinger
patent: 2614815 (1952-10-01), Marchant
patent: 2678542 (1954-05-01), Stanton
patent: 2697917 (1954-12-01), Mayer
patent: 3234738 (1966-02-01), Cook
patent: 4263786 (1981-04-01), Eng
patent: 4283924 (1981-08-01), Schutze

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