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Page 12 SMD Series Dehumidifying Dryers
1-6 The Drying System
Sterling Membrane Compressed air dryers, take a small percentage
of the dried gas and direct it back in a sweeping pattern through the
module shell. This provides a driving force to remove the moisture
with the minimum purge required.
The Moisture Vent Compressed Air Dryer, consists of thousands
of hollow-fiber membranes made of tough temperature and
pressure resistant plastic. The inside surface of these hollow fibers
is coated with an ultra-thin layer of a second plastic that performs
the actual water-vapor from air separation. This second coating
allows air to pass through it over 20,000 times easier than it allows
water to pass. As a result, moisture is expelled rapidly with very
little air loss. Two-stage drying provides the option of using the
Moisture Vent directly at the point-of-use in combination with a
refrigerated air dryer.
As a single stage unit, the dryer provides consistent performance
from 60°F to -20°F outlet dew point. When combined with a
refrigerated air dryer, the Moisture Vent system will suppress or
reduce the inlet pressure dew point to below -40°F with very low
sweep requirements.
Figure 2
Typical Dryer Air Flow Schematic
Water
Air
Purge
Dry Air
Humid Air
Dry Air