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BS EN 13487:2019 – TC:2020 Edition

$186.33

Tracked Changes. Heat exchanger. Forced convection air cooled refrigerant condensers and dry coolers. Sound measurement

Published By Publication Date Number of Pages
BSI 2020 72
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1.1 General This document is one of a series dedicated to air-cooled heat exchangers. – forced convection air cooled refrigerant condensers as specified in EN 327; – forced convection unit air coolers for refrigeration as specified in EN 328; – air cooled liquid coolers ‘dry coolers’ as specified in EN 1048. This document provides information for assessing and presenting the acoustic emission characteristics of heat exchangers under stationary operating conditions. This document is applicable to selfstanding forced convection air cooled refrigerant condensers and air cooled liquid coolers ‘dry coolers’ and air coolers. 1.2 Size of source The method specified in EN ISO 3744, EN ISO 3745, EN ISO 3746, EN ISO 9614 1, EN ISO 9614 2 and EN ISO 9614-3 is applicable to noise sources of any size. Limitations for the size of the source are given in 1.3 of EN ISO 3741:2010, EN ISO 3743 1:2010 and EN ISO 3743 2:2009. 1.3 Object This document offers ways to determine the sound power level of units. Some of them are specifically adapted to provide results with low uncertainties, by using laboratory class or engineering class acoustic methods under highly controlled working conditions. Those results are suitable for certification, labeling and marking purposes. This document is concerned with objective methods for determining sound power levels LW, expressed in decibels (dB) with reference to a sound power of one picowatt (1 pW), of airborne acoustical noise within the specified frequency range of interest and for prescribed operating conditions of the appliance to be measured: – A-weighted sound power level, LWA; – spectral sound power levels; – emission sound pressure level at workplace, LpA.

PDF Catalog

PDF Pages PDF Title
42 undefined
48 1 Scope
1.1 General
1.2 Size of source
1.3 Object
49 2 Normative references
50 3 Terms and definitions
53 4 Description of apparatus types
55 5 Sound power determination
5.1 General
5.2 Microphone positions and measurement surface for essentially free field conditions over reflecting plane and sound intensity measurements
5.2.1 General
56 5.2.2 Usual test installation with simplified arrangement of measurement points
5.2.3 Special test installation
5.3 Microphone positions in hard-walled test rooms or special reverberation test rooms
5.4 Background noise
5.5 Calculation of sound power
6 Emission sound pressure level determination
57 7 Installation and mounting conditions
7.1 Location
7.2 Mounting
8 Operating conditions
8.1 General
8.2 Supply of electrical energy
58 8.3 Fan speed setting
9 Measurement uncertainties
10 Information to be recorded
10.1 General
10.2 Noise source under test
59 10.3 Test environment
10.4 Instrumentation
10.5 Acoustical data
60 11 Information to be reported
11.1 General
11.2 Noise source under test
11.3 Test environment
11.4 Instrumentation
61 11.5 Acoustical data
12 Declaration and verification of noise emission values
62 Annex A (normative)Calculation of the sound power with different partial measuring surfaces in accordance with EN ISO 3744 and EN ISO 3746
A.1 General
A.2 Average sound pressure level on the partial measuring areas a to e
A.3 Sound power level of the test subject
63 Annex B (normative)Simplified arrangement of measuring points
B.1 Simplified arrangement of measuring points for vertical air flow
B.1.1 Positions of simplified arrangement for vertical air flow
B.1.2 Example with one fan for vertical air flow
64 B.1.3 Example with six fans for vertical air flow
B.2 Simplified arrangement of measuring points for horizontal air flow
B.2.1 Positions of simplified arrangement for horizontal air flow
65 B.2.2 Example with one fan for horizontal air flow
66 B.2.3 Example with six fans for horizontal air flow
67 Annex C (informative)Example of dual-number declaration
68 Annex D (normative)Deviations from the test subject
D.1 Model ranges composed of modules
69 Annex E (informative)Directivity
E.1 General
E.2 Definition
E.3 Calculation of the directivity number
BS EN 13487:2019 - TC
$186.33