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AIRCRAFT CABIN COMFORT CONTROL SYSTEM

  • US 3,861,624 A
  • Filed: 02/16/1973
  • Issued: 01/21/1975
  • Est. Priority Date: 02/16/1973
  • Status: Expired due to Term
First Claim
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1. An automatic control system for conditioning air ducted into the cabin section of a high altitude Flying plane, comprising:

  • a heat sensor bridge that includes first and second units located in the cabin section that are responsive to the temperature therein;

    a third sensor unit attached to a portion of the fuselage skin that is directly responsive to the temperature of the very cold air outside of the plane and is substantially insulated from cabin temperature;

    control means responsive to the electrical output of said sensor bridge and of said third sensor unit, said control means including a reversible motor-actuator operable in accordance with a preset temperature condition for the ducted air; and

    heat exchange means responsive to the operation of said motor-actuator to effect and substantially maintain the air at said preset temperature in the cabin section during flight;

    said third sensor unit being circuitally connected in said bridge in a manner to anticipate inside air control action for said motor-actuator in accordance with outside air temperature change, said heat exchange means including first ducting for engine hot bleed air, a cross-counterflow heat exchanger coupled with said first ducting, second ducting routing cold ram air into said heat exchanger, a damper in the second ducting for controlling the rate of ram air flow into the heat exchanger under control of said motor-actuator, and third ducting coupling the heat exchanger output as conditioned air to the cabin section.

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