Balancing of a Water and Air System (PDF
Balancing of a Water and Air System (PDF
Balancing of a Water and Air System (PDF
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<strong>of</strong> airflow. Permanent obstructions shall be noted by the NTT TAB Agency.<br />
• The cooling tower wet-deck surface (fill) shall be clean <strong>and</strong> free <strong>of</strong> foreign<br />
materials such as scale, algae, or tar.<br />
• The water in the upper <strong>and</strong> lower basins <strong>of</strong> the tower shall be set at proper<br />
operation levels as recommended by the tower manufacturer.<br />
• <strong>Water</strong> circulating pumps shall have been tested for correct operation <strong>and</strong><br />
placed in normal operating conditions.<br />
• If performing the CT1 test, the cooling tower manufacturer shall have<br />
submitted a full set <strong>of</strong> performance curves for the cooling tower. Additionally, the<br />
manufacturer shall provide a listing <strong>of</strong> the design point conditions <strong>of</strong>:<br />
• design liquid-to-gas ratio;<br />
• hot water temperature;<br />
• cold water temperature;<br />
• inlet wet bulb temperature;<br />
• inlet dry bulb temperature;<br />
• fan motor horsepower (motor output power unless otherwise specified);<br />
• fan motor efficiency;<br />
• design barometric pressure;<br />
• <strong>and</strong> density <strong>of</strong> air entering the fan(s) at design conditions.<br />
General Procedures<br />
The performance test is conducted by the NTT TAB Agency in the presence <strong>of</strong> authorized<br />
representatives <strong>of</strong> the manufacturer, the purchaser, <strong>and</strong> the owner, should they desire to<br />
be present. The NTT Agency shall give sufficient advance notice <strong>of</strong> the test date so that<br />
all concerned parties can arrange to be present. Additionally, the manufacturer shall be<br />
given sufficient time before the test to inspect <strong>and</strong> prepare the tower, if desired.<br />
The NTT TAB Agency uses a team <strong>of</strong> at least one TAB engineer <strong>and</strong> one technician to<br />
perform this test. Representatives <strong>of</strong> the manufacturer <strong>and</strong> purchaser are allowed to<br />
observe, but shall not participate in, reading <strong>and</strong> recording <strong>of</strong> test data.<br />
All test instrumentation shall be furnished, or inspected <strong>and</strong> approved, by the NTT TAB<br />
Agency. All thermometers used in the test are checked before <strong>and</strong> after the test by<br />
immersing them in a common bath, the temperature <strong>of</strong> which is between 70°F (32°C) <strong>and</strong><br />
90°F (63°C). Any thermometer whose corrected reading (actual reading plus calibration)<br />
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