Balancing of a Water and Air System (PDF

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• Design and actual entering water temperature
• Design and actual leaving water temperature
• Design and actual entering wet bulb
• Design and actual ambient dry bulb
Along with the data above, record the tower’s nameplate and/or submittal data to
indicate:
• Tower designation
• Manufacturer
• Model number and serial number
• Rated capacity in tons
Record the motor nameplate and heater element with actual amps, volts, calculated brake
horsepower. Record the design and actual rpms as well.
Performance Test Parameters
1. The cooling tower performance test must be specified and is not a standard test of the
TAB Agency. All parties involved in the cooling tower test must agree to the procedure,
date of test, and how the various measurements will be taken. The test performed will be
as prescribed by NTT or CTI.
2. While the following tasks are primarily the responsibility of other trades, they should
be checked by the testing agency as well before scheduling or conducting the cooling
tower performance test:
• Temperature taps or thermometer wells shall have been installed for measuring
the temperature of hot water entering the tower, cold water leaving the tower, and makeup
water entering the tower. All persons involved in the test must agree on the method of
temperature measuring.
• Provisions shall have been made to measure the re-circulating, make-up, and
blow down water flow rate with the proper runs of straight pipe upstream and
downstream of the measurement device. All persons involved in the test must agree on
the method of water flow measurement.
• A 110-volt AC power source shall be available at the tower site for
mechanically aspirated psychrometer.
• The water circulating system shall have been thoroughly cleaned of all foreign
matter. Samples of water shall be clear.
• The cooling tower fans shall be rotating correctly and operating within ±10% of
the design horsepower loading. All obstructions shall have been removed from the path
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