Operation.
The cooling turbine section of the ACM takes
cool high-pressure bleed air leaving the condenser, and
directs it onto the curved blades of the turbine.
As the
air leaves the turbine it expands, resulting in rapid
cooling of the bleed air. As the turbine rotates, energy,
extracted in the form of heat, transfers through the common
shaft to the fan section.
The fan loads the turbine and
draws cooling air across the heat exchanger and through the
precooler.
During maximum cooling, the speed of the ACM
may reach 70,000 rpm (fig. 1-29).
Figure 1-29.
Air Cycle Machine Schematic.
10.
Anti-Ice Temperature Sensor.
The anti-ice temperature sensor mounts in the low pressure outlet
duct of the condenser (fig. 1-30).
This sensor has an electrical
connector, a threaded mounting boss, and a short protruding sensing
probe.
Operation.
The anti-ice temperature sensor senses the
temperature of the turbine discharge air going through the
condenser.
The
sensor
works
with
the
temperature
controller
and
the
anti-ice
valve
to
maintain
the
temperature of the turbine discharge air at 45,F ƒ3,F.
The sensor operates on a negative coefficient which means
if the temperature around the sensor decreases,
25
OD1705
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