spaces that are open to each other through doorways,
elevator shafts and stairways.
ABSORPTION DISTANCE
Injection of liquid water droplets from a nozzle into
still air will require a certain amount of time prior to
vaporization being complete. The time for this
vaporization can be converted to a distance depending
on the velocity of injection into still air. The absorption
distance will increase with the speed of the absorbing
air. If absorption is not completed and the droplets hit
solid objects like machines, lights, piping and duct
work, they will moisten that surface. To avoid water
damage, it is important to prevent condensation on
any object.
COMPRESSED AIR
NORTEC AIRFOG systems use compressed air
as the control fluid. Compressed air is provided by a
compressor (supplied by others) or series of
compressors. The modular approach to the NORTEC
AIRFOG systems permits the designer to consider the
cost implications of using multiple smaller horsepower
compressors rather than one very large compressor
and moving the compressed air over great distances.
By using a multiple compressor design solution,
system reliability is increased, maintenance is possible
without shutting down all zones and capital cost is
often reduced.
It is recommended that air free of oil and moisture
(control quality air) be used with AIRFOG systems. All
air compressors will produce moisture which must be
removed using a refrigerated air dryer. Excessive
amounts of water in the air lines will reduce nozzle
performance, and in extreme cases will prevent the
nozzle from producing any mist. Oil must also be
removed from the compressed air through the use of
oil removal filters.
Air pressure loss can be managed by reduction in
the air pipe length, elimination of unnecessary elbows,
valves and flow restrictions, increasing the diameter of
the primary delivery pipe to the zones and elimination
of leaks.
OLDER NORTEC AIRFOG SYSTEM
COMPONENTS
This document is applicable to all NORTEC
AIRFOG system components purchased after
February 2004. If the designer has access to system
components purchased prior to February 2004, the
Axair Nortec Technical Service Department should be
consulted to determine compatibility with the newer
equipment, parts and external interfaces.
INSTALLATION TOOLS AND EQUIPMENT
The Designer should have already provided
drawings of the proposed AIRFOG humidification
system physical layout. These drawings and parts list
should clearly identify the system components by
name and part number, physical spacing, zone
identification and comments on nozzle location and
pointing directions.
During installation there will be a requirement to:
·Attach mounting brackets to walls, ceilings or
other structures which may be higher than six
feet off the floor.
·Cut and join copper, stainless steel or plastic
pipe using standard plumbing joining
techniques.
·Connect low voltage wiring to the control
panel.
·Connect plastic tubing.
·The installer should have all the tools to
perform these plumbing, mounting and
electrical tasks.
PARTS
A parts list should be included with the drawings
developed by the Designer. Not all the necessary
parts are provided by Axair Nortec. The following
piece parts are supplied by others:
Pipe, elbows, pipe hanger and mounting hardware
for inside HVAC units, T-joints, pipe size adapters,
Teflon sealing tape and other plumbing supplies from
a local plumbing supplier. Pipe material is either
copper, stainless steel or plastic and should be
specified on the Designer produced drawings.
Wire for the electrical connections is 18 gauge
standard insulation which can carry 24 Volts AC at 1
amp. This wire can be purchased from most electrical
suppliers.
Nails, screws, bolts, threaded rods, anchors, rivets
etc. to attach mounting brackets to the structure.
These fasteners will depend on the material used in
the mounting surface.
Insulation for the cold water pipe feeding the
system is required to prevent water vapor from
condensing and dripping on other structures,
machines, personnel or materials.
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