Marley
/
MH
Fluid Cooler
/
Specifications: Base
Specifications
Specification Value
11
1.0
Base:
1.1
Furnish and install an induced-draft,
crossflow-type, factory assembled,
galvanized steel, closed circuit fluid
cooler. Unit shall consist of _____
cell(s), as shown on plans. The limiting
overall dimensions of the tower shall
be _____ wide, _____ long, and _____
high to the top of the fan guard. Total
operating horsepower of all fans shall
not exceed _____ hp, consisting of
_____ @ _____ hp motor(s). Tower
shall be similar and equal in all
respects to Marley Model _______.
2.0
Thermal Performance:
2.1
Water as the heat transfer fluid.
The fluid cooler shall be capable of
cooling _____ GPM (L/s) of water
from _____ °F(°C) to _____ °F(°C) at a
design entering air wet-bulb tempera-
ture of _____ °F(°C). Coil pressure drop
shall not exceed _____ psi(kPa). The
thermal performance rating shall be
Certified by the Cooling Technology
Institute.
2.1
Aqueous glycol solution as the heat
transfer fluid.
The fluid cooler shall be capable of
cooling _____ GPM (L/s) of water
from _____ °F(°C) to _____ °F(°C) at
a design entering air wet-bulb tem-
perature of _____ °F(°C). Coil pressure
drop shall not exceed _____ psi(kPa).
The thermal performance rating shall
be based on the Cooling Technology
Institute certified performance rating
adjusted for the thermal properties of
the aqueous glycol solution used.
3.0
Performance Warranty:
3.1
CTI Certification notwithstanding, the
cooling tower manufacturer shall guar-
antee that the fluid cooler supplied
will meet the specified performance
conditions when the tower is installed
according to plans. If, because of a
suspected thermal performance defi-
ciency, the owner chooses to conduct
an on-site thermal performance test
under the supervision of a qualified,
Q
Your specification base establishes the type, configuration, base
material, and physical limitations of the fluid cooler to be quoted.
During the planning and layout stages of your project, you will
have focused your attention on a fluid cooler selection that fits
your space allotment, and whose power usage is acceptable.
Limitations on physical size and total operating horsepower
avoid the introduction of unforeseen operational and site-related
influences. Specifying the number of cells, and the maximum fan
hp/cell will work to your advantage.
The benefit of crossflow fluid coolers is that they are inherently
easy to operate, access, and maintain. Unlike counterflow fluid
coolers, crossflow fluid coolers have a spacious plenum between
banks of fill for easy access to all of the tower’s internal compo-
nents, and the water distribution system is adjacent to the fan deck.
Q
CTI Certification means that
the fluid cooler has been tested
under operating conditions and
found to perform as rated by the
manufacturer under those cir-
cumstances. It assures the buyer
that the tower is not intentionally
or inadvertently undersized by
the manufacturer.
Q
However, CTI certification alone is not sufficient to assure you
that the fluid cooler will perform satisfactorily in your situation.
Certification is established under relatively controlled conditions,
and fluid coolers seldom operate under such ideal circumstances.
They are affected by nearby structures, machinery, enclosures,
effluent from other sources, etc. Responsible and knowledge-
able bidders will take such site-specific effects into consideration
in selecting the fluid cooler—but the specifier must insist by the
written specification that the designer/manufacturer guarantee
this “real world” performance. Any reluctance on the part of the
bidder should cause you some concern.
¬
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
