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Engine No 1, 2 and 3 and/or APU bleed air Recycled cabin air Ram air (for heat exchanger ventilation) Conditioned air
EQUIPMENT LOCATION
DESCRIPTION
INTRODUCTION
The air conditioning system provides the pressurized areas with air at mild temperature. It consists of:
-Environmental Control Unit (ECU),
-distribution system.
The system is supplied with hot air coming from the common duct of the bleed air system.
The hot air enters the conditioning system via a cockpit conditioning electric valve or a cabin conditioning electric valve through a flow limiter and an ozone catalyzer. Positions of the two valves are controlled by the CABIN and CKPT pushbuttons located on
the BLEED AIR overhead panel (for more information, refer to ATA 36). Downstream from the conditioning valves, a variable amount of hot air is directed to the Environmental Control Unit (ECU) cooling system, through cockpit and cabin temperature
control dual electric valves. These valves are controlled in automatic or manual mode from the AIR CONDITIONING overhead panel. Cold air generated by the ECU is mixed with hot bleed air inside the cockpit and cabin ducts
to obtain the desired air temperature. Cold air from the ECU is also provided to the gaspers and used for cockpit avionics cooling.
ENVIRONMENTAL CONTROL UNIT (ECU)
The purpose of the environmental control unit is to generate the cold air required by the
cockpit and passenger cabin air conditioning systems, and the cold air system.
The ECU is mainly composed of:
-
a dual heat exchanger,
-
a turbofan,
-
a by-pass electric valve,
-
a turbocooler,
-two water separators (High Pressure and Low Pressure),
-a turbine anti-icing electric valve,
-an overheat detection system.
Dual Heat exchanger
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本文链接地址：DASSAULT FALCON 900EX EASY SYSTEMS SUMMARY Air Conditioning & Pressurization(2)
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