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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Field Performance Testing Of Chillers<br />
The performance test for a water-cooled chiller, air-cooled chiller, <strong>and</strong> an air-cooled<br />
chiller with a remote condenser must be specified. This test is not considered a st<strong>and</strong>ard<br />
test <strong>of</strong> the Balance Council, <strong>and</strong> is over <strong>and</strong> above basic chiller testing. All parties<br />
involved in the performance test must agree to the procedure, date <strong>of</strong> test, <strong>and</strong> how the<br />
various measurements will be taken.<br />
The following tasks are the responsibility <strong>of</strong> contractors <strong>and</strong>/or manufacturers involved<br />
<strong>and</strong> will be verified by the TAB Agency before the performance test is scheduled or<br />
performed:<br />
• Temperature taps or thermometer wells shall have been installed for measuring the<br />
temperature <strong>of</strong> water entering <strong>and</strong> leaving the evaporator <strong>and</strong> condenser. All persons<br />
involved in the test must agree on the method <strong>of</strong> temperature measuring<br />
• The water circulating system shall have been thoroughly cleaned <strong>of</strong> all foreign matter.<br />
Samples <strong>of</strong> the water shall be clear <strong>and</strong> indicate clear passage <strong>of</strong> water through the<br />
pumps, piping, <strong>and</strong> evaporators<br />
• The water circulating pump shall have been tested for correct operation, the strainers<br />
cleaned, <strong>and</strong> placed in normal operation<br />
• The liquid chilling package shall have been leak tested, dehydrated, evacuated, <strong>and</strong><br />
charged with the operating amount <strong>of</strong> refrigerant<br />
• <strong>Water</strong> flow measuring devices shall be installed <strong>and</strong> functioning<br />
General Procedures<br />
The performance test shall be conducted by the NTT Agency <strong>and</strong> the manufacturer in the<br />
presence <strong>of</strong> the purchaser, engineer, <strong>and</strong> final owner, should they desire to be present.<br />
There should be sufficient notice <strong>of</strong> the test date so that all concerned parties can<br />
arrange to be present. Additionally, if the manufacturer desires, he shall be given<br />
sufficient time before the test to inspect <strong>and</strong> prepare the system being tested.<br />
All test instrumentation shall be agreed upon by the purchaser, engineer, manufacturer,<br />
<strong>and</strong> NTT Agency. All thermometers used in the test shall be tested before <strong>and</strong> after the<br />
test. Any thermometer whose corrected reading (actual reading plus calibration) differs<br />
from the average by more than k 0.5ºF (0.lºC) shall not be used.<br />
The operating conditions <strong>of</strong> the test shall conform to the following:<br />
• Temperatures must be the average bulk stream<br />
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