ASHRAE 68 : 0
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
LABORATORY METHOD OF TESTING TO DETERMINE THE SOUND POWER IN A DUCT
Hardcopy , PDF
29-02-2016
English
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Foreword
1 Purpose
2 Scope
3 Definitions and Symbols
4 Measurement Uncertainty
5 Test Facilities and Instrumentation
6 Test Setup
7 Test Procedure
8 Calculations
9 References
TABLES
1 Estimated Standard Deviations
2 Maximum Reflection Coefficient
3 Frequency Response Correction C2
4 Flow Velocity Correction C3
5 Modal Correction C4
FIGURES
1A Test on Fan Outlet with Open Inlet
1B Test on Fan Outlet with Ducted Inlet
1C Test on Fan Inlet with Open Discharge
1D Test on Fan Inlet with Ducted Discharge
APPENDICES
A Estimation of Testing Accuracy
B Anechoic Termination
C Throttling Section Suggestions
D Example Calculations
E Turbulence Screen and Typical Mountings of
Microphone and Sampling Tube
F Determination of the Signal-to-Noise Ratio of
Sound to Turbulence Noise in the Test Duct
G Bibliography
Establishes a method of testing ducted fans to determine the sound power radiated into an anechoically terminated duct on the supply and/or return side of the equipment.
| DevelopmentNote |
Also numbered as AMCA 330 (04/2001)
|
| DocumentType |
Standard
|
| Pages |
18
|
| PublisherName |
American Society of Heating, Refrigerating & Air Conditioning Engineers
|
| Status |
Withdrawn
|
| ASME AG-1 : 2019 | CODE ON NUCLEAR AIR AND GAS TREATMENT |
| ASME AG 1 : 2012 | CODE ON NUCLEAR AIR AND GAS TREATMENT |
| ASHRAE HDBK REFRIGERATION : 2014 | ASHRAE HANDBOOK - REFRIGERATION |
| ANSI S1.31 : 1980 | BROADBAND NOISE SOURCES IN REVERBERATION ROOMS, PRECISION METHODS FOR THE DETERMINATION OF SOUND POWER LEVELS OF |
| ANSI S1.32 : 1980 | DISCRETE-FREQUENCY AND NARROW-BAND NOISE SOURCES IN REVERBERATION ROOMS, PRECISION METHODS FOR THE DETERMINATION OF SOUND POWER LEVELS OF, |
| ANSI S1.4 : 1983 | SPECIFICATION FOR SOUND LEVEL METERS |
| ANSI S1.11 : 2014 | SPECIFICATION FOR OCTAVE-BAND AND FRACTIONAL-OCTAVE-BAND ANALOG AND DIGITAL FILTERS |
| ANSI/ASA S1.6 : 2016 | PREFERRED FREQUENCIES AND FILTER BAND CENTER FREQUENCIES FOR ACOUSTICAL MEASUREMENTS |
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