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 |
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 |
