Principles Of Operation; Introduction; Air System; Moisture Removal System - Ingersoll Rand 200 Manual Del Operador

7.1 INTRODUCTION

Ingersoll Rand Nirvana™ Cycling dryers remove moisture from
compressed air by cooling the air temperature to between 34° and 38°F
(1 and 3°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.

7.3 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.
The condensate flows through the feed line into the drain unit and
accumulates in the container. A capacitive sensor continuously registers
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7.0 PRINCIPLES OF OPERATION

The following paragraphs
FLOW DIAGRAM
FIGURE 1
The
Nirvana Cycling Refrigerated Dryer Models 200-400
http://air.irco.com

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
" ," 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.
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 "
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 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 small diameter capillary
tube (expansion valve on water-cooled dryers) meters the refrigerant for
introduction into the evaporator. The refrigerant pressure is reduced
upon entering the evaporator where as it evaporates, removes heat from
the thermal mass fluid.
PROCESS AND
INSTRUMENTATION
DIAGRAM
NVC200-400
AIR AND
WATERCOOLED
(R-404A) ," refrigerant
REFRIG FLOW
5