Section 2
DESCRIPTION
8
2.3 REFRIGERANT CIRCUIT, FUNCTIONAL DE -
SCRIPTION
The ES---8 Integral Dryer cools the process air by
the use of a closed---loop vapor compressionrefrig-
eration cycle. Refer to Figure 2 --- 2 for the flow s che -
matics.
DryR---22vaporenters t he compressor inlet andits
pressure and t emperature are raised at discharge.
The vapor continues through a condenser, w here it
is cooled to its liquid state at near constant pres -
sure. A filter dryer then removes any water and im-
puritiesthat maybe carried by therefrigerant. A fur -
ther reduction of temperature and pressure takes
placeasthe liquidR---22is throttledthroughacapil-
lary tube. The resulting mixture of vapor and liquid
picksupheat(doescooling)asitmovesthroughthe
evaporator,whereitturnsbacktoitsvaporstateand
routes back to the compressor inlet port.
TopreventfeedingthecompressorwithliquidR---22
or evaporator icing during low heat load operation
(i.e., partial process air flow), a pressure operated
valve bypasses hot R---22 vapor to the evaporator
inlet, thus assuring thorough evaporation of the re -
frigerant.
To insure that adequate head pressure is main-
tained during periods of low ambient temperatures
or partial loads, a switch located at the compressor
discharge cycles the condenser fan on and off. If
theheadpressureistoolowtoinsureadequateflow
through the hot gas bypass valve, the condenser
fan is shut off.
Figure 2---2 Dryer Flow Schematic
AIR TO AIR HEAT EXCHANGER
MPF FILTER
DRY AIR OUTLET THROUGH
SEPARATOR FIL TER
(NOT SHOWN)
WET, SATURATED AIR PASSES
THROUGH MPF FILTER (NOT
SHOWN) PRIOR TO ENTERING
HEAT EXCHANGER
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