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A bleed air cleaner unit removes contaminants from hot 10th-stage bleed air prior to entering the precooler. The air is cleaned by a combination of vortex generation and centrifugal action.
A portion of the water contained in the bleed air is removed after passing through the secondary heat exchanger. Pack discharge air temperature is controlled by the low-limit valve, which maintains the cold air unit output just above freezing. The air then passes through the water separator, where water vapor is removed from the cold air prior to entering the cabin or cockpit distribution ducting.
Pack Output
Cold Air
Cold air from the right pack is ducted via a check valve on the aft pressure bulkhead, through flexible insulated ducts, to each passenger position along the right cabin and to the cockpit. Cold air is also drawn from these ducts and routed below the cabin floor to cool the avionics equipment. The cold airflow in the cockpit is divided to supply the pilot’s and copilot’s adjustable cold air vents on the overhead panel.
Cold air from the left pack is similarly ducted to the left cabin cold air outlets and to the avionics bay. Crossover ducts allow a cold air supply to both sides of the cabin, the cockpit area, and for avionics cooling, from one pack if necessary.
Conditioned Air
A balancing valve is located in each branch of the cabin conditioned air duct. The balancing valves are used to balance the airflow between left and right sides of the cabin, and between cabin and cockpit. Conditioned air is vented into the cabin area by ducting located below the windows on either side of the fuselage. In the cockpit, the conditioned air is supplied to both sides through outlets located on the side consoles, and adjustable gasper vents located on the side panels.
AIR CONDITIONING AND PRESSURIZATION Description Vol. 2 02.10.3
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Air Conditioning Pack . Schematic
Figure 02.10.1
AIR CONDITIONING AND PRESSURIZATION Description Vol. 2 02.10.4
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The cabin requires a greater volume of conditioned air than the cockpit. To achieve this, 100% of the right pack’s conditioned air, and 40% of the left pack’s conditioned air, is ducted to the cabin. The remaining 60% of the left pack’s output is ducted to the cockpit.
AIR CONDITIONING AND PRESSURIZATION Description Vol. 2 02.10.5
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Air Conditioning Distribution
Figure 02.10.2
AIR CONDITIONING AND PRESSURIZATION Description Vol. 2 02.10.6
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Temperature Control
Each pack has an identical but independently operated temperature control system. The left pack is controlled by the cockpit temperature control system, and the right pack is controlled by the cabin temperature control system. Each controller subsystem is comprised of the following components:
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