Specifications
HighInletTemperatureRefrigeratedAirDryer
7
Refrigeration Circuit
Refrigerantiscycledthroughaclosedloop
system commonly known as high pressure and
lowpressure.Refrigerantiscompressedbythe
compressor to a gas with high temperature and
high pressure, which then travels to the condenser
(air/water cooled) to drop the temperature and
change from gas to liquid. Liquid travels through
to the evaporator (refrigerant-to-air part of the heat
exchanger)andbacktothecompressorsuctionside
andtheprocessrepeatsitself.Athermalexpansion
hot gas by-pass valve is used on the non-cycling
dryers from the high side to low side as a freeze
protectorinlowloadconditions(125scfm).
Compressed Air Circuit
The compressed air dryer circuit uses a patented
air-to-airheatexchanger,whichactsasaprecooler/
reheater(40scfmratedmodelandhigher).Hot,
saturated, compressed air first enters the air-to-air
heatexchanger,whereitispre-cooledbyoutgoing
airfromtheair-to-refrigerantheatexchanger.
Thisenergysavingheatexchangerprovides
several advantages, such as a reduction of the heat
load imposed on the refrigerant compressor and
condenser, providing more energy to the outlet air,
and preventing condensation of moisture on the
outside of the plant distribution air line piping.
Fromtheair-to-airheatexchanger,airwillenter
into the evaporator further reducing its temperature
to a desired pressure dew point. As the air is
cooled, moisture will be condensed, where it is then
separated and discharged through the condensate
drain. The cooled air then reenters the air-to-air
heatexchanger,inadirectionoppositetotheflow
of the warm, saturated incoming air. This counter
flow action assures high temperature differential
throughouttheheatexchanger,resultinginamore
effective heat transfer.
compressor
liquid
receiver
air out
air in
refrigerant
inlet
refrigerant
outlet
air cooled
condensor
suction
accumulator
Air to Refrigerant Heat Exchanger
Refrigerant Circuit
TypicalSchematicFlowDiagram(20scfmratedmodels)