MH Fluid Cooler —
Engineering Data: Water Quality
8
SYSTEM CLEANLINESS
The MH Fluid Cooler can be a very effective air washer.
Atmospheric dust able to pass through the relatively small
louver openings will enter the recirculating water system.
Increased concentrations can intensify systems maintenance
by clogging screens and strainers—and smaller particulates
can coat system heat transfer surfaces. In areas of low flow
velocity—such as the collection basin—sedimentary deposits
can provide a breeding ground for bacteria.
In areas prone to dust and sedimentation, you should
consider installing some means for keeping the collection
basin clean. Typical devices include side stream filters and a
variety of filtration media.
BLOWDOWN
Blowdown or Bleedoff is the continuous removal of a
small portion of the water from the open recirculating system.
Blowdown is used to prevent the dissolved solids from
concentrating to the point where they will form scale. The
amount of blowdown required depends on the cooling range—
the difference between the hot and cold water temperatures
of the closed circuit— and the composition of the makeup
water. The MH Fluid Cooler is equipped with a blowdown
line with metering valve connected directly to the overflow.
Specific blowdown adjustment instructions and additional
blowdown information can be found in the MH Fluid Cooler
User Manual.
WATER TREATMENT
To control the buildup of dissolved solids resulting from
water evaporation, as well as airborne impurities and biological
contaminants including Legionella, an effective consistent
water treatment program is required. Simple blowdown may
be adequate to control corrosion and scale, but biological
contamination can only be controlled with biocides.
An acceptable water treatment program must be
compatible with the variety of materials incorporated in a fluid
cooler—ideally the pH of the recirculating water should fall
between 6.5 and 9.0. Batch feeding of the chemicals directly
into the fluid cooler is not a good practice since localized
damage to the fluid cooler is possible. Specific startup
instructions and additional water quality recommendations
can be found in the MH Fluid Cooler User Manual which
accompanies the fluid cooler and also is available from your
local Marley sales representative.
CAUTION
The fluid cooler must be located at such distance
and direction to avoid the possibility of contaminated
discharge air being drawn into building fresh air
intake ducts. The purchaser should obtain the
services of a Licensed Professional Engineer or
Registered Architect to certify that the location of
the fluid cooler is in compliance with applicable air
pollution, fire and clean air codes.
(44 paginas)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comentarios a estos manuales