Specifications
6
Design Parameters
Typeofdryer:Refrigerated
Powersupply:115,230Volt/singlephase/60Hz
Refrigeranttype:R-134A
ChemicalComposition:HFC
Parameter
Description
Optimum Maximum Minimum
Air Pressure
(PSIG)
150-175 200 80
Air Inlet
Temperature (°F)
100-180 200 40
Ambient
Temperature (°F)
75 100 32
SuctionGauge
Reading(psig)
28-40 60 28
DischargeGauge
Reading(psig)
160-250 350 80
Evaporator
Temperature (°F)
38-42 60 33
Description
System
A broad range of non-cycling refrigerated
compressed air dryers from 10 to 10,000 scfm is
offered.TheHighInletTemperatureRefrigerated
AirDryerseriescoversaflowrangefrom20to
125scfmprovidingreliable,constantdewpoint
performance in all flow conditions. Through
optimization of critical dryer components – heat
exchanger,separator,andcondensateremoval–the
system ensures the highest performance at full-
andpartial-loadconditions.R-134arefrigerant
is used in all refrigerated compressed air dryers
asstandard.R-134aistheindustry’spreferred
choice because of its 0.0 ozone depletion factor and
globalwarmingpotential.R-134aisaone-blend
refrigerant providing consistent performance (no
temperatureglide)andeasyservice(nomixtureof
different refrigerants).
Hotsaturatedairenterstheair-to-airheat
exchangeroftheHighInletTemperature
RefrigeratedAirDryerandisprecooledbythe
outgoing dry air. Precooling saves energy by
reducingtheheatloadonthedryer’scompressor.
The cool saturated air enters the air-to-refrigerant
heatexchangerwhereairtemperatureislowered
tothe48to50°Frange.Thisdramatictemperature
drop condenses water and oil.
Themixtureofcoldairandcondensationthen
flows into the two-stage separator filter where
liquids and contaminants are removed by
centrifugal action, directional flow change, and
velocity reduction. Once bulk liquids have been
removed, the compressed air goes through a
stainless steel mist eliminating filter that coalesces
oilaerosolsandoilvaporswithinthe50-micron
range, and then separates and removes them. At
this point, the compressed air is dry and virtually
oil-free.
Cold,dryairexitsthroughtheprecoolerheat
exchangerandisreheatedbyincominghotair.
Reheatingrestoresenergyandalsoprevents
condensation from forming on the outside of air
distribution piping. In the refrigeration unit, the
compressor pumps hot, high-pressure gaseous
refrigerant to the condenser where it is cooled
and liquefied by ambient air. From the condenser,
liquid refrigerant first flows through the receiver,
then through a filter/dryer, and finally through the
expansionvalvewherepressureandtemperature
are reduced. This reduction in pressure causes
the liquid refrigerant to boil until it reaches the
saturation temperature that corresponds to its
pressure. As the low-pressure refrigerant passes
through the evaporator, heat flows from the
compressed air to the refrigerant, causing the
boiling to continue until all refrigerant is vaporized.
Refrigerantgasisreturnedtothecompressorand
the cycle is repeated. A hot gas by-pass valve is used
to control temperature in the evaporator.
AircelDHTSeries-Models20-125