gives up its moisture more easily at lower temperatures,
the condenser reduces the temperature to the water
separation point.
The cooling air comes from the air cycle machine turbine
discharge.
The very cold cooling air causes the moisture
in the bleed air to condense into water drops.
As the
bleed air leaves the condenser, it passes through a water
extractor that removes the condensation from the bleed air
in the duct. The moisture removed from the bleed air goes
through the heat exchanger with the cooling air to provide
more efficient and effective cooling in the heat exchanger.
Turbine. The bleed air enters the turbine where it expands
and the temperature and pressure decrease, the fourth and
final cooling stage, due to the loading effect of the
active components.
In the turbine, the bleed air causes
the turbine blades, which connect to a fan on a common
shaft, to rotate.
The turbine rotates at a speed directly proportional to the
amount of airflow through it.
The fan attached to the
turbine
shaft
intensifies
the
rate
of
cooling
air
transported through the heat exchanger and precooler.
After the cooling (ambient) air has gone through the
precooler and heat exchanger, the system discharges it
overboard through the ballistic grille.
When air leaves the turbine, you would then consider it
"turbine discharge air." The turbine discharge air then
passes through the condenser again, and on through the
conditioned air duct into the tank's hull.
Low Limit Control (Anti-Ice System).
If the air coming
from the turbine becomes too cold, the condenser could ice
and restrict airflow from the condenser. To prevent this,
the system has a means of controlling the turbine discharge
air temperature.
The condenser's low pressure discharge
duct has the low limit or anti-ice sensor placed in it.
This sensor sends a signal to a controller and the
controller signals the low limit or anti-ice valve.
The low limit or anti-ice valve opens if the sensor detects
a temperature below the predetermined point (45,F ƒ3).
When the valve opens, it allows warm air, taken from a
tapoff before the turbine inlet, to mix with the turbine
discharge air, which brings the temperature of the air
leaving the condenser up to the
6
OD1705
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