SRC Service Manual
Revision 02
Aug 2007
3.1.1 Air-to-Air Heat Exchanger
An Air-to-Air Heat Exchanger is an aluminium fin, cross flow exchanger. The Air-to-Air Heat
Exchanger is also often called a “Pre-cooler / Re-heater” because the hot air entering the dryer is pre-
cooled by the cold air exiting the dryer; while at the same time the cold air exiting the dryer is re-
heated by the hot air entering. Then end result is that the pre-cooling offers a significantly reduced
heat load on the cooling circuit (which offers notable energy savings), and the re-heating offers
elimination of condensation accumulation on the downstream air piping, as well as increasing the
temperature of the air, keeping it well away from the dew point. The air leaving the dryer is
approximately 10 degrees cooler than the air coming in.
3.1.2 Air-to-Coolant Heat Exchanger
An Air-to-Coolant Heat Exchanger is an aluminium fin, counter flow
exchanger. Here, the air (having been already pre-cooled in the Air-
to-Air Heat Exchanger), is further cooled by the coolant mixture. This
Heat Exchanger is part of both the air and coolant circuits.
3.1.3 Demister
Separator
All models are equipped with a
Slowflow
demister type moisture
separator to remove the condensed liquids from the compressed air.
The liquid droplets impact the stainless steel fibers of the demister, and coalesce into larger drops
where they are pulled into the Condensate chamber by gravity.
The demister combines a high efficiency with a low pressure drop. It is significantly larger than
standard demisters (typically at least four times as large) and as such the air velocity across it is much
slower. In addition, the
Slowflow
design provides increased contact time allowing high separation
efficiency. The S
lowflow
demister separator guarantees perfect operation at all air flows, unlike
centrifugal separators which quickly lose efficiency at lower air flows, and standard demisters which
lose efficiency at higher air flows.
Once separated the condensate is removed from the air circuit by the condensate drain. The dry, cold
air then passes through the “re-heating” side of the air-to-air exchanger.
3.1.4 Condensate Chamber
Condensate is collected in the condensate chamber before being discharged from the system through
the Condensate Drain.
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