Air Conditioning Packs
Figure 004
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**ON A/C 301-399,
R R R A. Air Conditioning Packs (Ref. Fig. 001, 004) The air conditioning packs 10HM (11HM) are identified as PACK 1 and PACK 2 to correspond with the pneumatic manifolds. Both packs are installed in the unpressurized area of the belly fairing between frames 35.8 and 41. The air conditioning pack supplies the means of cooling the hot bleed air taken from the pneumatic manifold. This is done with the primary heat exchanger, main heat exchanger and a turbine and compressor in a boot-strap air-cycle machine. The turbine supplies shaft power to drive the compressor and fan. On the ground the fan draws ambient air through the primary heat exchanger and the main heat exchanger for cooling. For pack temperature control functions refer to chapter 21-61-00.
R **ON A/C 401-499,
R R R R R R R R R R R R A. Air Conditioning Packs (Ref. Fig. 001A) The air conditioning packs 10HM (11HM) are identified as PACK 1 and PACK 2 to correspond with the pneumatic manifolds. Both packs are installed in the unpressurized area of the belly fairing between frames 35 and 41. The air conditioning pack supplies the means of cooling the hot bleed air taken from the pneumatic manifold. This is done with the primary heat exchanger, main heat exchanger and a turbine and compressor in a boot-strap air-cycle machine. The turbine supplies shaft power to drive the compressor and fan. On the ground the fan draws ambient air through the primary heat exchanger and the main heat exchanger for cooling. For pack temperature control functions refer to chapter 21-61-00.
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B. Air-Cycle Machine
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(Ref. Fig. 005)
Air-Cycle Machine
Figure 005
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(Ref. Fig. 005A)
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The main component of the air-cycle machine is a rotating shaft. A turbine, a compressor and a fan are mounted along the shaft. The shaft rotates on two self-acting foil-air bearings, a double self-acting air-thrust bearing takes the axial thrust loads. Air tapped from the turbine inlet, is used to cool the bearing and then discharged into the ram airflow. Labyrinth seals reduce air leakage between static and rotating parts. The light-alloy turbine is supplied with air through a stainless-steel nozzle and a light-alloy scroll. In case of turbine break up, the stainless-steel nozzle acts as a containment ring. The light-alloy centrifugal compressor is mounted in the center of the rotating shaft. Air is supplied from a light-alloy scroll, an outer scroll has a stainless-steel diffuser. In case of a compressor break up, the stainless-steel diffuser acts as a containment ring. Fan air is discharged through a conical nozzle, this gives a jet-pump effect in the fiberglass plenum diffuser. The primary heat exchanger outlet is connected to the discharge ram airflow through the fiberglass diffuser. The air-cycle machine has a de-icing system at the turbine outlet. Hot high-pressure air is tapped from the compressor scroll through a duct. It circulates through the annulus turbine outlet to prevent ice formation at the turbine outlet. The air, after thermal exchange, is returned to the compressor intake through a duct.
C. Water Extractor (Ref. Fig. 006) The water extractor is made from light alloy, and contains static swirl vanes and a water drain inside a body. Swirl vanes centrifuge the water droplets in the air to the inner surface of the water extractor body. The water collects at the lowest point of the body. It is then drained to ducts which leads to the water injectors 20HM (21HM) which spray the water into the ram airflow. This helps the cooling capacity through the process of evaporation. The water extractor is installed at the high-pressure outlet of the condenser.
D. Reheater (Ref. Fig. 007) The reheater, which is made of aluminum-alloy, is a plate and fin type of single crossflow configuration.
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Air-Cycle Machine
Figure 005A
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Water Extractor Figure 006
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Reheater Figure 007
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E. Condenser (Ref. Fig. 008) The condenser, which is made of aluminium-alloy, is a tubular heat exchanger with a tube-to-tube discharge. 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：A320飛機維護手冊 AMM AIR CONDITIONING 空調 3(156)
