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 F. Primary Heat Exchanger (Ref. Fig. 009) The primary heat exchanger, which is made of aluminum alloy, is a plate and fin type of single-pass crossflow configuration.
 G. Main Heat Exchanger (Ref. Fig. 010) The main heat exchanger, which is made of aluminum-alloy, is a plate and fin type, of counterflow configuration. The heat exchanger is installed between the air-cycle machine compressor and turbine, the cooling agent is ambient ram air.
 H. Check-Valve Pack Downstream (Ref. Fig. 011) The pack downstream check valve 15HM (16HM) is a 6 in. (152.3997 mm), pneumatically operated, single spring loaded flap type, which is made of light aluminum-alloy. The check valves are bolted directly to the pressure bulkhead and supply conditioned air to the system. The valves stop leakage of air from the distribution system in case of failures of the air conditioning system (e.g. duct rupture within the pack).
 J. Water Injector (Ref. Fig. 012) The water injector 20HM (21HM) is installed in the ram-air inlet duct, upstream of the heat exchangers. The injector nozzle is connected to the sump of the water extractor with a small diameter pipe. The water from the extractor is delivered under pressure into the ram airflow to increase the cooling capacity through evaporation.
 K. Fan Plenum The fan plenum 10HM5 (11HM5) is installed between the primary heat exchanger and the ram air outlet. It is made from reinforced plastic. In this plenum the air-cycle machine fan causes a suction in order to get a sufficient cooling airflow on the ground when the ram air is not available.
R

 Condenser Figure 008
 1EFF : 1 1R 1CES  ALL  1 11 1 21-52-00 Page 18 Feb 01/05

 

 Primary Heat Exchanger Figure 009
 1EFF : 1 1R 1CES  ALL  1 11 1 21-52-00 Page 19 Feb 01/05

 

 Main Heat Exchanger Figure 010
 1EFF : 1 1R 1CES  ALL  1 11 1 21-52-00 Page 20 Feb 01/05

 

 Check Valve Pack Downstream Figure 011
 1EFF : 1 1R 1CES  ALL  1 11 1 21-52-00 Page 21 Feb 01/05

 

 Water Injector Figure 012
 1EFF : 1 1R 1CES  ALL  1 11 1 21-52-00 Page 22 Aug 01/05

 

R  5. Operation/Control and Indication________________________________ **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
R  (Ref. Fig. 001) **ON A/C 401-499,
 (Ref. Fig. 001A) **ON A/C 001-003, 051-054,
R  (Ref. Fig. 002) **ON A/C 004-049, 055-099, 101-149, 151-199, 201-299, 301-399, 401-499,
R  (Ref. Fig. 002A) **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
R  When the PACK 1 (2) pushbutton switches are pushed, the zone controller 8HK and pack controllers 7HH (27HH) control the flow control valves to supply a constant volumetric flow for all normal operation conditions to the air conditioning packs. **ON A/C 401-499,
 When the PACK 1 (2) pushbutton switches are pushed, the ACSC's 47HH (57HH) control the flow control valves to supply a constant volumetric flow for all normal operation conditions to the air conditioning packs.

 

 **ON A/C ALL
 A. Normal Operating Mode When the bleed air enters the system, it is cooled in the primary heat exchanger with ambient ram air. Part of this air passes through the bypass valve 10HH (30HH) (Ref. 21-61-00). The remainder is then compressed in the air-cycle machine compressor, which increases the temperature and pressure. It is cooled again in the main heat exchanger with ambient ram air. The air now enters the high-pressure water-extraction loop, where it is cooled to about its dew point.
 The high-pressure water-extraction loop has a reheater, a condenser and a water extractor. The reheater uses the turbine inlet air of the air-cycle machine to cool the air in the high-pressure water-extraction loop. The condenser then uses cold turbine air to further cool the air to below its dew point. The condenser is a heat exchanger, which uses the temperature difference between the turbine outlet air temperature (which is to a sea level dew point of approx. 0 deg.C (32.00 deg.F)) and the reheater outlet temperature air. The condensed water is extracted and drained from the air, as it passes through the high-pressure water extractor. After the water extractor the air enters the reheater again and the temperature increases to assure that no free water enters the turbine.

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 In the air-cycle machine turbine, the high pressure air expands and its kinetic energy drives the air-cycle machine, and the temperature and the pressure decreases. This causes an additional condensation in the air-cycle machine turbine outlet during ground operation and low altitude flight operation. This condensation appears as snow.
 The turbine outlet air passing through the condenser is the now conditioned air. It leaves the air cooling system through the pack downstream check valves.
　
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