a.
Purge connections;
b.
Relief devices;
c.
Refrigerant valves;
d.
Liquid-level indicating devices;
e.
Companion flanges, bolts, and gaskets for flanged water
connections;
f.
Stands or saddles; and
g.
Water drain connections.
2.5.4
Performance
Base performance on water velocities not less than 0.91 m/s 3 fps nor more
than 3.66 m/s 12 fps and fouling factor of 0.0005. Water-cooled condensers
may be provided for refrigerant storage in lieu of a separate liquid
receiver, provided that condenser storage capacity is 20 percent in excess
of fully charged system.
2.5.5
Condenser Controls
[When refrigerant discharge pressure decreases, a pressure controller shall
modulate a three-way valve to mix leaving condenser water.] [When water
temperature leaving condenser decreases, cooling tower fan shall be
de-energized.] Controls shall be set for a saturated refrigerant
condensing temperature of 40 degrees C 105 degrees F.
2.6
LIQUID COOLERS, REMOTE-TYPE
Direct expansion flooded type; constructed, tested, and rated in
conformance with ARI 480. Refrigerant side design pressure shall comply
with ASHRAE 15. Water side design pressure shall be not less than 1034 kPa
(gage) 150 psig. Tubes shall be seamless copper. On direct expansion
units, each refrigerant circuit shall be complete with liquid solenoid
valve and expansion device capable of modulating to minimum step of
capacity unloading. For water side of liquid cooler, performance shall be
based on a water velocity ranging from 0.91 to 3.66 m/s 3 to 12 fps with a
fouling factor of 0.00025.
2.7
COOLING TOWERS
**************************************************************************
NOTE: Research project location conditions to
determine the environmental effects on finned tube
coils. The research should include a survey of
existing similar equipment. Prepare project
specifications based on the conclusions of the
research. Consideration should be given to the
following combinations based on past experience of
these materials in dealing with the local conditions.
1.
Copper tube and aluminum fins, coated
2.
Copper tube and copper fins, coated
SECTION 15601N
Page 29
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