Functional Description - Comprag Rdx Serie Bedienungsanleitung

2.3 Functional description

Compressor (1) injects hot refrigerant into condenser (3), where a large amount of the refrig-
erant is turned into liquid form. The liquid refrigerant passes via the filter (5) into the capillary
tube (6). After passing through the capillary tube (6) and before entering the evaporator (2),
the pressure of the liquid refrigerant is lowered to boiling pressure with a change from liquid
to gaseous form. The refrigerant in the evaporator (2) receives the heat from the compressed
air by means of heat exchange and fully changes to a gaseous state. The compressed air
cools to dew-point +3°С by means of heat exchange. The water vapour present in the com-
pressed air is condensed. The condensate formed is extracted by the condensate drain valve
(9). Hot refrigerant enters the suction line of the compressor (1) from the evaporator (2) and
the cycle repeats itself. In order to stabilize the pressure of the refrigerant in the condenser
(3), a temperature sensor (8) is installed, which controls function of the fan (4). If the pres-
sure in the evaporator (2) drops (insufficient quantity of compressed air enters the dryer, no-
load operation) a hot gas bypass valve is activated and it allows pressure in the evaporator to
drop lower than the defined level.
1.Compressor
2.Evaporator
3.Condenser
4.Condenser fan
5.Refrigerant drying filter
6.Capillary tube
7.Hot gas bypass valve
8.Temperature sensor of fan
9.Condensate drain valve
Fig. 2.1 Flow chart of compressed air dryer
COMPRAG RDX series compressed air refrigerated dryer
2
9
6
AIR
REFRIGERANT
1
5
4
7
8
3
11