Marley
/
MH
Fluid Cooler
/
Engineering Data: Water Quality
10
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
.
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.
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. For complete water treatment
recommendations and services contact Marley Water
Resources, toll free at 877 800 0929 or contact your local
Marley sales representative.
MULTICHILL Refrigeration Products
SPX Cooling Technologies - Marley Cooling Towers
Cooke Industries - Phone: +64-9-579 2185 Fax: +64-9-579 2181 Email: [email protected] Web: www.cookeindustries.co.nz
