7.1 INTRODUCTION
Ingersoll Rand Nirvana™ Cycling dryers remove moisture from
compressed air by cooling the air temperature to between 36° and 40°F
(2 and 4°C). This causes vapors to condense into liquid droplets which
can then be easily removed from the air. The major systems of the dryer
which contribute to its operation are the Air System, the Moisture
Removal System, the Refrigeration System, the Thermal Mass
Circulating System and the Controls.
describe each of the systems in greater detail.
7.2 AIR SYSTEM
The air system consists of the dryer components which are in contact
with the compressed air. Referring to Figure 1 and following the bold
7.3 MOISTURE REMOVAL SYSTEM
Ingersoll Rand condensate drains discharge condensed moisture and
lubricants (condensate) from compressed air equipment.
condensate drain operates as a zero-air-loss drain, returning air that is
displaced in the drain bowl back into the compressed air system.
Consistent discharging of condensate from compressed air equipment
is essential for proper equipment operation and performance.
The condensate drain uses a unique sensing method to determine the
level of condensate in the drain bowl. A transducer located in the drain
bowl continuously sends out a signal 50 times per second. Once the
transducer determines that the level of condensate has reached a
predetermined level within the drain bowl, a signal is sent to the no-loss
drain valve to open. This operation permits removal of condensate of up
to 80 gallons per hour.
The drain also features a test button that permits manual operation of
the no-loss drain valve. Depressing the test button illuminates the LED
and energizes the solenoid valve. The LED illuminates to indicate
"POWER ON" and goes off when the no-loss drain valve is operated by
the transducer or manual test button.
All manuals and user guides at all-guides.com
7.0 PRINCIPLES OF OPERATION
The following paragraphs
FIGURE 1
FLOW DIAGRAM
The
Nirvana Cycling Refrigerated Dryer Models 2000-2400
http://air.ingersollrand.com
"
," hot saturated air from the compressor enters the
AIR FLOW
precooler/reheater where the air temperature is reduced prior to
entering the chiller by the cool air exiting the air/moisture separator. This
precooling allows for the use of a smaller refrigeration system. The air
then goes into the chiller section where it is further cooled to the desired
dew point by a thermal mass fluid. The temperature of the thermal mass
fluid is maintained by the refrigeration circuit and controls. The air
continues to the separator where moisture is removed, thereby, allowing
the cool, dry air to return back to the precooler/reheater to be heated by
the incoming moist hot air. The air exiting the "reheater" portion of the
dryer should be approximately 15°- 20°F lower than the inlet air
temperature based on standard conditions at full rated flow.
INSTRUMENTATION DIAGRAM
The condensate flows through the feed line into the drain unit and
accumulates in the container. A capacitive sensor continuously registers
the liquid level and passes a signal to the electronic control as soon as
the container is filled. The pilot valve is then activated and the
diaphragm opens the outlet line for discharging the condensate. When
the drain unit has been emptied, the outlet line is closed again quickly
and tightly without wasting compressed air.
7.4 REFRIGERATION SYSTEM
The Refrigeration System consists of all the components which handle
R-404A. This is a hermetically sealed closed-loop system. Referring to
Figure 1 and following the phantom "REFRIGERANT" line, refrigerant is
shown leaving the evaporator section where, in the process of removing
heat, it is changed from a low pressure liquid into a low pressure gas.
This gas enters the suction side of the compressor where it is
compressed into a high pressure gas. The high pressure gas is cooled
in the air cooled or water cooled condenser section until it becomes a
high pressure liquid. It then goes through a permanent filter dryer that
ensures the refrigeration system is free of contaminants. A thermostatic
expansion valve meters the refrigerant for introduction into the
PROCESS AND
NVC2000-2400
AIR AND WATERCOOLED
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