insufficient cooling air or space or additional
reliability is necessary (requiring cross-connecting
of radiators), provide remote radiators.
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NOTE: At the text below, use the maximum dry-bulb
temperature of the site plus 8 degrees C 15 degrees F
for the first temperature, but not less than 43
degrees C 110 degrees F. Use minus 18 degrees C 0
degrees F, except where minimum dry-bulb temperature
permits use of a higher temperature.
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Provide for each engine-generator set, as standard with the manufacturer.
a.
Design Conditions: Each radiator unit shall have ample capacity to
remove not less than the total kW Btu per hour of heat rejected by its
respective engine at 100 percent full-rated load to the jacket water,
fuel oil, and lubricating oil system, and intercooler. Radiator
capacity shall be rated at optimum temperature of coolant leaving the
engine and intercooler as recommended by the engine manufacturer with
an ambient dry bulb air temperature outside the enclosure of [_____]
degrees C [_____] degrees F maximum, and [_____] degrees C [_____]
degrees F minimum at the site elevation specified in the paragraph
entitled "Site Conditions," and with the coolant mixture specified in
the paragraph entitled "Diesel Engine Capacity." Pressure drop through
the radiator shall not exceed 41.34 kPa 6 psi when circulating the
maximum required coolant flow. Radiator air velocity shall be a
maximum of 7.6 meters per second 1500 feet per minute.
[b.
Engine Mounted Radiator Construction: Radiator fan shall direct
airflow from the engine outward through the radiator. Fan shall be
V-belt driven directly from the engine crankshaft. Radiator fan shall
have sufficient capacity to meet design conditions against a static
restriction of [_____] Pa [_____] inch of water. Fan static capacity
shall be adjusted to suit the ductwork furnished. Cooling section
shall have a tube and fin-type core consisting of copper or copper base
alloy tubes with nonferrous fins. Select engine-driven fans for quiet
vibration-free operation. Make provision for coolant expansion either
by self-contained expansion tanks or separately mounted expansion
tanks, as standard with the manufacturer. Provide suitable guards for
each fan and drive.]
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NOTE: Radiator fan cycling controls should be
considered for engines to be operated above 500
hours per year.
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[c.
Remote Radiator Construction: Provide radiators as described above,
except radiators shall be remotely piped and provided with electric
motor driven fan. Drive shall be multiple V-belt or reduction gears.
Expansion tanks shall be separately mounted. Air flow shall be
vertical or horizontal as indicated. Interlock fan with engine
operation such that fan shall operate when engine operates when
recommended by engine manufacturer.[ Provide controls and control
devices complete which shall cycle fan on and off based upon coolant
temperature.] Provide motors, controllers, contactors, and disconnects
SECTION 16237N
Page 27
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