OMEGA AIR RDT Series, Installation And Operating Manual

Page: 11 / 39

11
4 Refrigeration air dryer operation
The refrigeration air dryer is designed to remove moisture from the input air to achieve the desired
dew point at the exit.
All refrigeration air dryers described above operate according to the same principle. The operation of
the refrigeration air dryer can be divided into two main circuits: Air and refrigeration circuit.
Air Circuit : Hot, moisture saturated air enters the 3in1 heat exchanger. The air then passes through
the evaporator, also called the air / refrigerant heat exchanger. The air temperature is reduced to
about 2 ° C, which causes condensation of the water vapor. The liquid is merged into larger droplets
and collected in a separator, from where the condensate drain removes it from the system. The cool
air without liquid water is returned through the air / air heat exchanger, where it is heated to
approximately 5
° C lower temperature than the input air.
Refrigeration circuit : The refrigerant enters the compressor and then enters the condenser at high
pressure, where it transfers heat to the ambient air and condenses. The liquid then passes through the
capillary tube, where its pressure and consequently the temperature decreases. At low pressure, the
liquid refrigerant enters the heat exchanger where it receives heat from the inlet compressed air and
causes the evaporation of the refrigerant. The low-pressure gaseous refrigerant returns to the
compressor, which compresses it and starts the cycle again. During periods of reduced compressed air
load, the excess of the refrigerant automatically passes through the hot gas bypass valve back to the
compressor.
* For more detailed information contact your supplier.
1
Heat exchanger 3in1
a Air / air heat exchanger
b Air / coolant heat exchanger
c Separator
2
Inlet of compressed air
3
Outlet of compressed air
4
Compressor
5
Condenser
6
Hot gas bypass valve
7
Filter / Dehydrator
8
Capillary tube/Thermal expansion
valve
9
Condensate drain