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Chiller Application Note
A 400-ton, air cooled, rotary compressor, chiller was
installed at a private school to service their new expansion. A location
had been chosen to minimize noise impact on residential neighbors (Class 1
land use) and the school itself. However, intrinsic site topography
aggravated chiller noise emissions, which exceeded the local noise
ordinance, resulting in a legal action.
Prior to Aeroacoustic Engineering Consultants, LLC (AEC)
involvement, a number of remediation schemes were considered including
chiller relocation. A cantilevered acoustic barrier system was designed
and estimated at well over
$500,000 to fabricate and install!
. . .
Due to the
questionable acoustic and aerodynamic performance projected for the
cantilevered barrier, AEC was brought into the remediation project.
Within two (2) weeks time, AEC had developed conceptual designs for a
totally passive (no booster fans nor blowers) acoustic enclosure,
accomplished aeroacoustic computer simulations including defacto site
topography with all computer modeling under full thermal load and
aerodynamic flow of nearly 270,000-SCFM of
air! From the iterative computer simulations, a design configuration was
selected that would guarantee the owner a minimum noise
reduction of 30-dBA at 1-meter distance from any silencer intake or
discharge, all at far less cost than the acoustic barrier.
provided the system design, acoustic hardware fabrication, installation
supervision and performance warrantee
for acoustics as well as chiller operating parameters. Actual
installation was accomplished by the owners building contractor. The
contractor had estimated a nominal five (5) days on site for
installation. Actual installation was accomplished in just five (5)
hours attributable to AECís modular construction and precision fit
acoustic performance (dynamic insertion loss or noise reduction) was
tested at approximately 40-dBA at 1-meter
distance from the chiller enclosure. Increased power
consumption and reduced cooling capacity was immeasurable. AEC
aerodynamic design allows the addition of intake filters to reduce
condenser coil fouling and subsequent maintenance. Reduced solar heat
gain on chiller is expected to offset any losses attributable to minimal,
aerodynamic static pressure!
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