Herrmidifier Load Calculator User Manual
Page 18

L o a d C a l c u l a t i o n G u i d e
L o a d C a l c u l a t i o n G u i d e
18
w w w. h e r r m i d i f i e r- h v a c . c o m
than with centrifugal atomizers. Pneumatic atomizers are
usually manufactured as heads which can be installed on a
ceiling or in a duct. Some pneumatic atomizers use only air
under pressure, and others use air and water under pres-
sure.
A Pneumatic Atomizing System that uses only air under
pressure and draws water from open, nonpressurized tanks
is called a GRAVITY SYSTEM. This type of system uses
about 25 CFM of air per 100 lbs. of water atomized per hour,
or more. It is highly susceptible to algae and bacteria growth
in the tanks and clogging is a constant problem. Atomizing
heads of this type often drip at the end of an “ON” cycle and
therefore should not be placed over valuable equipment or
material.
Pneumatic atomizing heads that use air and water un-
der pressure are called DUAL-PNEUMATIC ATOMIZING
HEADS. This is generally a closed system that works well
in unclean atmospheres. Air consumption is much less than
that for the gravity system, and there are no tanks to collect
algae and bacteria. Most of these systems however, will drip
on “start up” because the air and water line are pressurized
at the same time and water will split out of the head before
sufficient atomization pressure has built up in the air lines.
On “shut down” dripping may also occur because of residual
pressure in the water lines. Although most dual-pneumatic
atomizing heads contain a cleaning pin which effectively
cleans the water orifice, droplets of water left in the atomizing
section of the head will evaporate and leave minerals behind
which can eventually clog the head. A frequent maintenance
schedule must be followed to insure that the heads will con-
tinue to operate satisfactorily.
HERRMIDIFIER’S DUAL-PNEUMATIC ATOMIZING SYS-
TEM uses a dual-pneumatic head which is activated by water
pressure so that no water can flow without being pressurized.
The design of the head allows the use of only 12 CFM of air
per 100 lbs. of water atomized, not the 25 CFM required by
some others! A special control system prevents water from
flowing until sufficient air pressure has been reached to at-
omize every drop of water allowing not one drop to fall to the
floor! A stainless steel cleaning pin cleans the water orifice
at the end of each “ON” cycle and the special control sys-
tem blows the atomizing section of each head dry to prevent
dripping and clogging. The no-drip feature of this ingenious
system permits it to be installed right over production areas
with no fear of water dripping on equipment or materials. The
self- cleaning mechanisms of the system is so effective that
YEARLY MAINTENANCE is all that is required. The low air
and energy consumption of this system make it especially
attractive with today’s energy shortage.
Applications would include: woodworking, leather working,
textiles, bakeries, cold storage, printing, paper and invest-
ment casting. (See Bulletin I/C DP.)
HERRMIDIFIER’S HERRMIDIGOOL IN-DUCT AIR/WATER
ATOMIZING SYSTEM incorporates Herrmidifier’s patented
Dual-Pneumatic atomizing heads and utilizing a system of
either pneumatic, electric or electronic control provides for
the installation with an air-handling ducted system. This
system automatically adjusts its output to exactly match de-
mand. The adjustment is accomplished by either modulating
the flow rate of the water to the heads or by individually mod-
ulating each head. Multiple systems installed within one air
handier can be staged to insure maximum energy efficiency.
Humidity receivers and transmitters installed within the air
handler and monitored through the Herrmidicool controls
cabinet insures the maintenance of precise levels of relative
humidity and provide that saturation and condensation will
not occur.
The need and the preference for an induct atomization hu-
midification system is evident for both the benefits of con-
trolled humidification, as well as evaporative cooling. The
evaporative cooling benefit is derived from the energy re-
quired to evaporate a pound of water. With a Herrmidicool
system, this energy is drawn directly from the ambient air
and is properly referred to as a conversion of sensible heat
to latent heat. As this energy is drawn from the air, a corre-
sponding depression of the dry bulb temperature occurs and
thus “free cooling” is
provided. This can be directly translated to savings in me-
chanical cooling. The use of either de-ionized or reverse os-
mosis processed water allows for the use of this system in
clean room environments. Applications would include: Office
Buildings, Clean Rooms, Computer Rooms, and Manufac-
turing Areas. (See Bulletin I/C-HC.)