Herrmidifier Herrmidicool Technical Guide - Manual (Page 7)

Selecting Head Size Quantity
The atomizing heads are available in 6, 8, 10, 12 & 15
lbs./hr. capacities. As a rule, the larger the head, the
greater the moisture concentration and the greater the
distance required for evaporation. The water droplet size
created is approximately 30 micron on the Dv90 scale at
full output. The heads should be arranged so they are
mounted on a single manifold across the duct. NEVER
arrange the heads so that the spray of one hits the spray
of another as the water droplets will coalesce and
become larger, increasing the evaporation distance
required. Always try to use the smallest head than can
be fitted into the system, in order
Selecting Control Section
Control Cabinets are available in three different output
sizes as well as raw and DI/RO water. All connection
sizes, as shown in Table I are the same..
TABLE 1
to enhance evaporation. Chart II should be used as a
guideline. The trick, of course, is to insure evaporation.
Larger droplets will take longer to evaporate and will
require more distance. On a cooling coil or mist
eliminator, larger droplets will mean more water down
the drain. Since increasing the output of an atomizing
head increases the droplet size, merely turning up an
undersized system will not accomplish the desired effect
and may even worsen the total evaporation. The best
design is one that uses the smallest possible head size
with the best distribution possible. The following figure
shows good design and spacing.
IN
IN WATER
WATER
IN AIR
IN AIR
CONTROL CABINET AIR CONNECTION WATER CONNECTION CAPACITY
All ¾” (19mm) ½” (13mm) Up to 1000 lbs./hr. (454
kg/h)
HERRMIDICOOL Technical Manual