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

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.)