Brochure

Testing you can count on
Testing at more diffi cult operating
conditions to account for clean tubes
Tubes in the chiller serve as the heat transfer
surface. A certain amount of fouling will occur
on the walls of the tubes after the chiller is
operating. Fouling impedes heat transfer and
makes the chiller work harder. The predicted
chiller performance anticipates slightly reduced
heat transfer performance due to the fouling
factor specifi ed. The test conditions will be
adjusted so that the chiller works as hard during
the test as it will after fouling has occurred.
The evaporator leaving water temperature is
adjusted slightly lower. For water-cooled chillers,
the condenser entering water temperature is
adjusted slightly higher.
Recording of test data
The computer data acquisition system records
four sets of data at fi ve minute intervals. It
displays the result of each data set. Following
the fourth set, the results are averaged and a
report is generated. We will review this report
with you to confi rm that your chiller meets the
test requirements.
Test instrument calibration
To ensure our chiller testing meets or exceeds
the accuracy requirements of AHRI Standard
550/590, testing equipment is calibrated and
validated by the National Institute of Standards
and Technology (NIST). A copy of the latest
calibration report is available on request.
Redundant measurements
Redundant measuring devices are designed into
test loops to verify test data. Redundant sensors
measure water fl ow rates, temperatures and
unit power consumption. Agreement between
the calibrated sensors confi rms the data taken
is accurate. Continuous real-time monitoring of
these measurements is done for all performance
and witness tests.
Heat balance calculation
To confi rm that the water-cooled test data
is valid, a heat balance is calculated to verify
that the energy entering the system (at the
evaporator and the motor) equals the energy
leaving the system (at the condenser). The
heat balance calculation does not verify if the
performance is good or bad; rather, it validates
that the quality of the data is good. Trane
typically calculates a 100 percent load heat
balance of ± 1.5 percent, which is tighter than
the AHRI-defi ned heat balance tolerance.
We are committed to using environmentally conscious print practices.
©2014 Ingersoll Rand RF-SLB012-EN December 09, 2014
Research and
development
The testing process starts in
research and development.
We look at environmental
performance, acoustic
characteristics, operating
longevity, and overall
operating efficiency. After the
chiller goes into production,
we keep looking for ways to
make it better, quieter, more
reliable and more efficient.
Test chiller, Trane Laboratory
Ingersoll Rand (NYSE:IR) advances the quality of life by creating comfortable, sustainable and efficient environments.
Our people and our family of brands—including Club Car®, Ingersoll Rand®, Thermo King® and Trane®—work together to
enhance the quality and comfort of air in homes and buildings; transport and protect food and perishables; and increase
industrial productivity and efficiency. We are a $12 billion global business committed to a world of sustainable progress
and enduring results.
©2014 Ingersoll Rand IR000000We are committed to using environmentally conscious print practices.
ingersollrand.com